{"id":6609,"date":"2025-12-09T10:12:19","date_gmt":"2025-12-09T02:12:19","guid":{"rendered":"https:\/\/sunhyings.com\/?page_id=6609"},"modified":"2025-12-15T17:12:41","modified_gmt":"2025-12-15T09:12:41","slug":"stainless-steel-304-316","status":"publish","type":"page","link":"https:\/\/sunhyings.com\/de\/materials\/stainless-steel-304-316\/","title":{"rendered":"304\/304L &amp; 316\/316L"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"6609\" class=\"elementor elementor-6609\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-147de08 e-con-full e-flex e-con e-parent\" data-id=\"147de08\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-cdf7574 elementor-widget elementor-widget-html\" data-id=\"cdf7574\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<style>\r\n\/* =========================================\r\n   Sunhy Styles - Color Fix Only\r\n   \u4fdd\u7559\u5e03\u5c40\uff0c\u4ec5\u4fee\u590d\u5b57\u4f53\u989c\u8272\u53ef\u89c1\u6027\r\n   ========================================= *\/\r\n\r\n\/* 1. \u57fa\u7840\u5bb9\u5668\u4e0e\u5b57\u4f53 *\/\r\n.sunhy-ss-page {\r\n \r\n    color: #111827; \/* \u5168\u5c40\u6df1\u8272\u5b57 *\/\r\n    background-color: #f9fafb;\r\n    line-height: 1.6;\r\n    font-size: 15px;\r\n}\r\n\r\n.sunhy-ss-page .ss-container {\r\n    max-width: 1120px;\r\n    margin: 0 auto;\r\n    padding: 24px 16px 40px;\r\n}\r\n\r\n\/* 2. \u6807\u9898\u901a\u7528 *\/\r\n.sunhy-ss-page h1,\r\n.sunhy-ss-page h2,\r\n.sunhy-ss-page h3,\r\n.sunhy-ss-page h4 {\r\n    color: #111827;\r\n    font-weight: 700;\r\n    margin: 0 0 12px;\r\n}\r\n.sunhy-ss-page h1 { font-size: 30px; }\r\n.sunhy-ss-page h2 { font-size: 24px; margin-top: 24px; }\r\n.sunhy-ss-page h3 { font-size: 18px; margin-top: 18px; }\r\n\r\n.sunhy-ss-page p {\r\n    margin: 0 0 10px;\r\n    color: #4b5563;\r\n}\r\n\r\n\/* 3. 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} }\r\n.sunhy-ss-page label { display: block; font-size: 13px; color: #374151; margin-bottom: 3px; }\r\n.sunhy-ss-page input, .sunhy-ss-page textarea { width: 100%; border-radius: 8px; border: 1px solid #d1d5db; padding: 6px 8px; font-size: 13px; box-sizing: border-box; }\r\n.sunhy-ss-page textarea { resize: vertical; min-height: 80px; }\r\n<\/style>\r\n<div class=\"sunhy-ss-page\">\r\n\r\n    <!-- HERO\uff1a\u603b\u89c8 -->\r\n    <section class=\"ss-hero\">\r\n        <div class=\"ss-hero-inner\">\r\n            <div class=\"ss-hero-main\">\r\n                <div class=\"ss-hero-eyebrow\">Stainless Steel Material Selection Guide<\/div>\r\n                <h1 class=\"ss-hero-title\">\r\n                    Stainless Steel 304 \/ 304L &amp; 316 \/ 316L  \r\n                    Material &amp; Sourcing Guide\r\n                <\/h1>\r\n                <p class=\"ss-hero-subtitle\">\r\n                    Practical, engineer-level handbook for choosing between\r\n                    <strong>304 \/ 304L<\/strong> and <strong>316 \/ 316L<\/strong> in process equipment,\r\n                    marine hardware and hygienic applications. Prepared by Sunhyings materials engineers.\r\n                <\/p>\r\n                <ul class=\"ss-hero-list\">\r\n                    <li>Side-by-side comparison of chemistry, properties and corrosion behaviour.<\/li>\r\n                    <li>When 304\/304L is sufficient \u2013 and when you really need 316\/316L.<\/li>\r\n                    <li>Guidance for purchasers: typical standards, product forms and documentation.<\/li>\r\n                <\/ul>\r\n                <div class=\"ss-hero-actions\">\r\n                    <a href=\"#contact\" class=\"ss-btn-primary\">\r\n                        Request 304 \/ 316 Plate &amp; Coil Quote\r\n                    <\/a>\r\n                    <a href=\"#downloads\" class=\"ss-btn-secondary\">\r\n                        Download Material Datasheet (PDF)\r\n                    <\/a>\r\n                <\/div>\r\n            <\/div>\r\n            <aside class=\"ss-hero-side\">\r\n                <div class=\"ss-hero-side-title\">Typical use cases<\/div>\r\n                <p>\r\n                    <strong>304 \/ 304L:<\/strong> General purpose stainless for indoor equipment, mild\r\n                    atmospheres, many food &amp; beverage and structural applications.<br><br>\r\n                    <strong>316 \/ 316L:<\/strong> Upgraded grade for marine\/coastal, chloride-bearing\r\n                    environments and more aggressive chemical media.\r\n                <\/p>\r\n            <\/aside>\r\n        <\/div>\r\n    <\/section>\r\n\r\n    <div class=\"ss-container\">\r\n\r\n        <!-- E-E-A-T \u4f5c\u8005\u4fe1\u606f -->\r\n        <section class=\"ss-eeat-card\">\r\n            <div class=\"ss-eeat-left\">\r\n                <div class=\"ss-eeat-avatar\">SS<\/div>\r\n                <div class=\"ss-eeat-meta\">\r\n                    <div class=\"ss-eeat-label\">Technical content reviewed by<\/div>\r\n                    <div class=\"ss-eeat-name\">Sunhyings Materials Engineering Team<\/div>\r\n                    <div style=\"font-size: 12px; color:#6b7280;\">\r\n                        Metallurgical engineers with experience in pressure equipment, marine hardware,\r\n                        food-grade and pharmaceutical stainless steel projects.\r\n                    <\/div>\r\n                <\/div>\r\n            <\/div>\r\n            <div class=\"ss-eeat-right\">\r\n                <div style=\"font-size: 12px;\">\r\n                    Data referenced from ASTM A240 \/ A480, EN 10088-2, EN 10028-7 and mill technical\r\n                    literature. Values are typical and for guidance only. Design and acceptance must\r\n                    follow your project codes (ASME, PED, GB, etc.) and local regulations.\r\n                <\/div>\r\n            <\/div>\r\n        <\/section>\r\n\r\n        <div class=\"ss-layout\">\r\n            <!-- \u76ee\u5f55 -->\r\n            <aside class=\"ss-toc\">\r\n                <div class=\"ss-toc-title\">On this page<\/div>\r\n                <nav>\r\n                    <a href=\"#overview\">1. Material overview &amp; key differences<\/a>\r\n                    <a href=\"#chemistry\">2. Chemistry &amp; designations<\/a>\r\n                    <a href=\"#properties\">3. Mechanical &amp; physical properties<\/a>\r\n                    <a href=\"#corrosion\">4. Corrosion behaviour<\/a>\r\n                    <a href=\"#selection\">5. When to choose 304L vs 316L<\/a>\r\n                    <a href=\"#fabrication\">6. Fabrication &amp; welding<\/a>\r\n                    <a href=\"#applications\">7. Typical industry applications<\/a>\r\n                    <a href=\"#quality\">8. Quality, MTCs &amp; supply scope<\/a>\r\n                    <a href=\"#faq\">9. FAQ: 304 vs 316 questions we see most<\/a>\r\n                    <a href=\"#downloads\">10. Downloads &amp; contact<\/a>\r\n                <\/nav>\r\n            <\/aside>\r\n\r\n            <!-- \u4e3b\u4f53\u5185\u5bb9 -->\r\n            <main class=\"ss-main\">\r\n\r\n                <!-- 1. \u6982\u89c8 -->\r\n                <section id=\"overview\" class=\"ss-section\">\r\n                    <h2>1. Material Overview: 304 \/ 304L vs 316 \/ 316L in One Page<\/h2>\r\n                    <p>\r\n                        Austenitic stainless steels <strong>304 \/ 304L<\/strong> and\r\n                        <strong>316 \/ 316L<\/strong> are by far the most widely used grades in\r\n                        process equipment, pipelines and fabricated stainless structures.\r\n                    <\/p>\r\n                    <p>\r\n                        In simple terms:\r\n                    <\/p>\r\n                    <ul>\r\n                        <li><strong>304 \/ 304L<\/strong> is the \u201cworkhorse\u201d grade for many indoor and mildly\r\n                            corrosive environments, offering a good balance of cost, corrosion resistance\r\n                            and fabricability.<\/li>\r\n                        <li><strong>316 \/ 316L<\/strong> adds <strong>molybdenum (Mo)<\/strong>, significantly\r\n                            improving resistance to chlorides (salt, de-icing chemicals, many process\r\n                            streams) and certain chemicals \u2013 at a higher alloy and purchase cost.<\/li>\r\n                        <li>\r\n                            The <strong>L<\/strong> variants (304L, 316L) limit carbon to \u22640.03% to\r\n                            improve resistance to weld sensitisation and intergranular corrosion in\r\n                            welded heavy sections.\r\n                        <\/li>\r\n                    <\/ul>\r\n                    <p>\r\n                        For Sunhyings customers, material selection is usually a trade-off between\r\n                        <strong>corrosion risk, life-cycle cost and code compliance<\/strong>. This guide\r\n                        is written to help engineers and buyers justify that decision with clear\r\n                        technical reasoning.\r\n                    <\/p>\r\n                <\/section>\r\n\r\n                <!-- 2. \u5316\u5b66\u6210\u5206 -->\r\n                <section id=\"chemistry\" class=\"ss-section\">\r\n                    <h2>2. Chemistry &amp; International Designations<\/h2>\r\n                    <p>\r\n                        Both 304 and 316 are chromium-nickel austenitic stainless steels. The key\r\n                        difference is the deliberate addition of <strong>2\u20133% Mo<\/strong> in 316 \/ 316L,\r\n                        plus slight adjustments to Ni to maintain the austenitic structure.\r\n                    <\/p>\r\n\r\n                    <h3>2.1 Designations at a glance<\/h3>\r\n                    <table>\r\n                        <thead>\r\n                        <tr>\r\n                            <th>Grade family<\/th>\r\n                            <th>UNS<\/th>\r\n                            <th>EN<\/th>\r\n                            <th>Common names<\/th>\r\n                        <\/tr>\r\n                        <\/thead>\r\n                        <tbody>\r\n                        <tr>\r\n                            <td>304<\/td>\r\n                            <td>S30400<\/td>\r\n                            <td>1.4301<\/td>\r\n                            <td>304, X5CrNi18-10<\/td>\r\n                        <\/tr>\r\n                        <tr>\r\n                            <td>304L<\/td>\r\n                            <td>S30403<\/td>\r\n                            <td>1.4307<\/td>\r\n                            <td>304L, low-carbon 304<\/td>\r\n                        <\/tr>\r\n                        <tr>\r\n                            <td>316<\/td>\r\n                            <td>S31600<\/td>\r\n                            <td>1.4401<\/td>\r\n                            <td>316, X5CrNiMo17-12-2<\/td>\r\n                        <\/tr>\r\n                        <tr>\r\n                            <td>316L<\/td>\r\n                            <td>S31603<\/td>\r\n                            <td>1.4404<\/td>\r\n                            <td>316L, low-carbon 316<\/td>\r\n                        <\/tr>\r\n                        <\/tbody>\r\n                    <\/table>\r\n\r\n                    <h3>2.2 Typical chemical composition ranges (% by weight)<\/h3>\r\n                    <table>\r\n                        <thead>\r\n                        <tr>\r\n                            <th>Element<\/th>\r\n                            <th>304 \/ 304L<\/th>\r\n                            <th>316 \/ 316L<\/th>\r\n                            <th>Technical function<\/th>\r\n                        <\/tr>\r\n                        <\/thead>\r\n                        <tbody>\r\n                        <tr>\r\n                            <td>Carbon (C)<\/td>\r\n                            <td>\u22640.07 (304), \u22640.03 (304L)<\/td>\r\n                            <td>\u22640.08 (316), \u22640.03 (316L)<\/td>\r\n                            <td>Strength contributor; lower C reduces weld sensitisation.<\/td>\r\n                        <\/tr>\r\n                        <tr>\r\n                            <td>Chromium (Cr)<\/td>\r\n                            <td>17.5\u201319.5<\/td>\r\n                            <td>16.5\u201318.5<\/td>\r\n                            <td>Forms passive Cr\u2082O\u2083 film; baseline stainless behaviour.<\/td>\r\n                        <\/tr>\r\n                        <tr>\r\n                            <td>Nickel (Ni)<\/td>\r\n                            <td>8.0\u201310.5<\/td>\r\n                            <td>10.0\u201313.0<\/td>\r\n                            <td>Stabilises austenite; improves toughness and acid resistance.<\/td>\r\n                        <\/tr>\r\n                        <tr>\r\n                            <td>Molybdenum (Mo)<\/td>\r\n                            <td>\u2013<\/td>\r\n                            <td>2.0\u20132.5 (typical)<\/td>\r\n                            <td>Raises pitting\/crevice corrosion resistance in chlorides.<\/td>\r\n                        <\/tr>\r\n                        <tr>\r\n                            <td>Manganese (Mn)<\/td>\r\n                            <td>\u22642.0<\/td>\r\n                            <td>\u22642.0<\/td>\r\n                            <td>Improves hot workability; secondary austenite former.<\/td>\r\n                        <\/tr>\r\n                        <tr>\r\n                            <td>Silicon (Si)<\/td>\r\n                            <td>\u22641.0<\/td>\r\n                            <td>\u22641.0<\/td>\r\n                            <td>Deoxidiser during steelmaking.<\/td>\r\n                        <\/tr>\r\n                        <tr>\r\n                            <td>Nitrogen (N)<\/td>\r\n                            <td>\u22640.11<\/td>\r\n                            <td>\u22640.11<\/td>\r\n                            <td>Interstitial strengthener; also contributes to pitting resistance.<\/td>\r\n                        <\/tr>\r\n                        <\/tbody>\r\n                    <\/table>\r\n\r\n                    <p style=\"font-size:12px;color:#6b7280;\">\r\n                        Note: Many plates are supplied dual-certified (e.g. 304\/304L or 316\/316L),\r\n                        combining low-carbon weldability with the minimum strength of the parent grade.\r\n                        Always confirm on the MTC if you have strict code requirements.\r\n                    <\/p>\r\n                <\/section>\r\n\r\n                <!-- 3. \u6027\u80fd -->\r\n                <section id=\"properties\" class=\"ss-section\">\r\n                    <h2>3. Mechanical &amp; Physical Properties<\/h2>\r\n                    <p>\r\n                        Both grade families share the characteristic high toughness and ductility of\r\n                        austenitic stainless steels. At room temperature, mechanical properties in\r\n                        solution-annealed plate are broadly comparable, with 316 often showing slightly\r\n                        higher tensile strength in practice.\r\n                    <\/p>\r\n\r\n                    <h3>3.1 Typical mechanical properties (plate, room temperature)<\/h3>\r\n                    <table>\r\n                        <thead>\r\n                        <tr>\r\n                            <th>Property<\/th>\r\n                            <th>304 \/ 304L<\/th>\r\n                            <th>316 \/ 316L<\/th>\r\n                            <th>Comments<\/th>\r\n                        <\/tr>\r\n                        <\/thead>\r\n                        <tbody>\r\n                        <tr>\r\n                            <td>Tensile strength R<sub>m<\/sub><\/td>\r\n                            <td>\u2265520 MPa<\/td>\r\n                            <td>\u2265515 MPa<\/td>\r\n                            <td>Mill results often 550\u2013650 MPa for both families.<\/td>\r\n                        <\/tr>\r\n                        <tr>\r\n                            <td>0.2% proof strength R<sub>p0.2<\/sub><\/td>\r\n                            <td>\u2265205 MPa<\/td>\r\n                            <td>\u2265205 MPa<\/td>\r\n                            <td>Design codes use conservative allowable stresses.<\/td>\r\n                        <\/tr>\r\n                        <tr>\r\n                            <td>Elongation A<sub>50<\/sub><\/td>\r\n                            <td>\u226540%<\/td>\r\n                            <td>\u226540%<\/td>\r\n                            <td>Excellent ductility for forming and deep drawing.<\/td>\r\n                        <\/tr>\r\n                        <tr>\r\n                            <td>Hardness (Brinell)<\/td>\r\n                            <td>\u2264215 HB (typical limits)<\/td>\r\n                            <td>\u2264217 HB (typical limits)<\/td>\r\n                            <td>Cold work can increase hardness substantially.<\/td>\r\n                        <\/tr>\r\n                        <\/tbody>\r\n                    <\/table>\r\n\r\n                    <h3>3.2 Physical properties (typical)<\/h3>\r\n                    <table>\r\n                        <thead>\r\n                        <tr>\r\n                            <th>Property<\/th>\r\n                            <th>304 \/ 304L<\/th>\r\n                            <th>316 \/ 316L<\/th>\r\n                            <th>Unit<\/th>\r\n                        <\/tr>\r\n                        <\/thead>\r\n                        <tbody>\r\n                        <tr>\r\n                            <td>Density<\/td>\r\n                            <td>\u2248 8.0<\/td>\r\n                            <td>\u2248 8.0<\/td>\r\n                            <td>g\/cm\u00b3<\/td>\r\n                        <\/tr>\r\n                        <tr>\r\n                            <td>Thermal conductivity (20\u00b0C)<\/td>\r\n                            <td>\u2248 16<\/td>\r\n                            <td>\u2248 16<\/td>\r\n                            <td>W\/m\u00b7K<\/td>\r\n                        <\/tr>\r\n                        <tr>\r\n                            <td>Coefficient of expansion (20\u2013100\u00b0C)<\/td>\r\n                            <td>\u2248 17.3<\/td>\r\n                            <td>\u2248 16.0<\/td>\r\n                            <td>\u00b5m\/m\u00b7\u00b0C<\/td>\r\n                        <\/tr>\r\n                        <tr>\r\n                            <td>Electrical resistivity<\/td>\r\n                            <td>\u2248 0.73<\/td>\r\n                            <td>\u2248 0.74<\/td>\r\n                            <td>\u00b5\u03a9\u00b7m<\/td>\r\n                        <\/tr>\r\n                        <tr>\r\n                            <td>Magnetic permeability (annealed)<\/td>\r\n                            <td>&lt; 1.05<\/td>\r\n                            <td>&lt; 1.05<\/td>\r\n                            <td>\u00b5<sub>r<\/sub><\/td>\r\n                        <\/tr>\r\n                        <\/tbody>\r\n                    <\/table>\r\n\r\n                    <p style=\"font-size:12px;color:#6b7280;\">\r\n                        In fully solution-annealed condition, both grade families are essentially\r\n                        non-magnetic. Cold work (bending, forming) can introduce slight magnetism\r\n                        without significantly affecting corrosion resistance.\r\n                    <\/p>\r\n                <\/section>\r\n\r\n                <!-- 4. \u8150\u8680\u8868\u73b0 -->\r\n                <section id=\"corrosion\" class=\"ss-section\">\r\n                    <h2>4. Corrosion Behaviour in Real Environments<\/h2>\r\n                    <p>\r\n                        The most important practical difference is corrosion resistance \u2013 especially\r\n                        in chloride-bearing environments (sea salt, de-icing salts, many process\r\n                        streams, cleaning chemicals).\r\n                    <\/p>\r\n\r\n                    <h3>4.1 Pitting &amp; crevice corrosion (chlorides)<\/h3>\r\n                    <p>\r\n                        Engineers often use the <strong>Pitting Resistance Equivalent Number (PREN)<\/strong>\r\n                        as a quick indicator:\r\n                    <\/p>\r\n                    <p>\r\n                        PREN \u2248 %Cr + 3.3 \u00d7 %Mo + 16 \u00d7 %N\r\n                    <\/p>\r\n                    <ul>\r\n                        <li><strong>304 \/ 304L<\/strong> typically gives PREN around <strong>18\u201320<\/strong>.<\/li>\r\n                        <li><strong>316 \/ 316L<\/strong>, with Mo, typically gives PREN around\r\n                            <strong>24\u201326<\/strong>.<\/li>\r\n                    <\/ul>\r\n                    <p>\r\n                        In practice this means:\r\n                    <\/p>\r\n                    <ul>\r\n                        <li>For dry indoor environments and many mildly corrosive services,\r\n                            <strong>304L<\/strong> is completely adequate.<\/li>\r\n                        <li>In coastal atmospheres, splash zones, salt-spray areas or hot chloride\r\n                            cleaning solutions, <strong>316L<\/strong> usually offers significantly\r\n                            better margin against pitting and tea-staining.<\/li>\r\n                        <li>In warm, stagnant seawater or heavily contaminated crevices, even 316L\r\n                            can still pit; duplex or higher-alloy grades may be needed.<\/li>\r\n                    <\/ul>\r\n\r\n                    <h3>4.2 Intergranular corrosion &amp; the role of \u201cL\u201d grades<\/h3>\r\n                    <p>\r\n                        When welded material spends time in the 425\u2013860\u00b0C range, chromium carbides\r\n                        can precipitate at grain boundaries, locally depleting Cr and creating paths\r\n                        for intergranular attack. This is called <strong>weld sensitisation<\/strong>.\r\n                    <\/p>\r\n                    <ul>\r\n                        <li><strong>304L<\/strong> and <strong>316L<\/strong> limit carbon to 0.03% max,\r\n                            minimising carbide formation and providing much better resistance to\r\n                            intergranular corrosion in welded heavy sections, without needing\r\n                            post-weld solution annealing in most thicknesses.<\/li>\r\n                    <\/ul>\r\n\r\n                    <h3>4.3 Stress corrosion cracking (SCC)<\/h3>\r\n                    <p>\r\n                        All austenitic stainless steels, including 304L and 316L, can suffer chloride\r\n                        stress corrosion cracking when <strong>tensile stress + chlorides + elevated\r\n                        temperature (usually &gt;60\u00b0C)<\/strong> act together. 316L is somewhat\r\n                        better than 304L, but SCC risk remains. For high-risk combinations,\r\n                        duplex stainless steels are normally preferred.\r\n                    <\/p>\r\n                <\/section>\r\n\r\n                <!-- 5. \u9009\u6750\u5efa\u8bae -->\r\n                <section id=\"selection\" class=\"ss-section\">\r\n                    <h2>5. How to Decide: 304L or 316L for Your Project?<\/h2>\r\n                    <p>\r\n                        Many buyers ask a simple question: \u201cCan I save cost by staying with 304L, or\r\n                        do I really need 316L?\u201d The answer depends on the medium, temperature,\r\n                        environment and cleaning regime.\r\n                    <\/p>\r\n\r\n                    <h3>5.1 Situations where 304 \/ 304L is usually sufficient<\/h3>\r\n                    <ul>\r\n                        <li>Indoor process equipment in dry, clean industrial atmospheres.<\/li>\r\n                        <li>Food &amp; beverage equipment handling low-chloride products at moderate\r\n                            temperatures (for example many dry foods, sugar, beer, milk).<\/li>\r\n                        <li>Architectural components not exposed to sea spray or de-icing salts, with\r\n                            reasonable cleaning.<\/li>\r\n                        <li>Structural brackets, frames and supports where cosmetic appearance is\r\n                            important but exposure is mild.<\/li>\r\n                    <\/ul>\r\n\r\n                    <h3>5.2 Situations where 316 \/ 316L is strongly recommended<\/h3>\r\n                    <ul>\r\n                        <li>Coastal and offshore environments (marine hardware, ladders, cable trays,\r\n                            coastal fa\u00e7ade panels).<\/li>\r\n                        <li>Equipment exposed to <strong>chloride-bearing cleaning chemicals<\/strong> or\r\n                            CIP media at elevated temperature.<\/li>\r\n                        <li>Process streams containing chlorides, reducing acids or fertiliser\r\n                            solutions where 304L test coupons show early pitting.<\/li>\r\n                        <li>High-value installations where downtime or repair access is difficult and\r\n                            a conservative corrosion allowance is justified.<\/li>\r\n                    <\/ul>\r\n\r\n                    <p>\r\n                        Sunhyings can review your actual service conditions \u2013 not just the alloy\r\n                        name \u2013 to recommend whether 304L or 316L is the more economical choice over\r\n                        the whole life of the equipment.\r\n                    <\/p>\r\n                <\/section>\r\n\r\n                <!-- 6. \u5236\u9020\u4e0e\u710a\u63a5 -->\r\n                <section id=\"fabrication\" class=\"ss-section\">\r\n                    <h2>6. Fabrication &amp; Welding Considerations<\/h2>\r\n                    <p>\r\n                        304L and 316L behave very similarly in workshop operations. Both are readily\r\n                        formed, machined and welded with appropriate procedures.\r\n                    <\/p>\r\n\r\n                    <h3>6.1 Welding<\/h3>\r\n                    <ul>\r\n                        <li>Suitable for all common processes (TIG\/GTAW, MIG\/GMAW, MMA\/SMAW, SAW).<\/li>\r\n                        <li>Use matching low-carbon filler metals (e.g. 308L for 304L, 316L \/ 316LSi\r\n                            for 316L) to maintain corrosion resistance in the weld metal.<\/li>\r\n                        <li>Control heat input and interpass temperature to avoid excessive distortion\r\n                            and preserve toughness.<\/li>\r\n                        <li>Thorough <strong>post-weld cleaning<\/strong> (pickling, passivation,\r\n                            removal of heat tint) is essential to restore full corrosion resistance,\r\n                            especially in aggressive environments.<\/li>\r\n                    <\/ul>\r\n\r\n                    <h3>6.2 Machining &amp; forming<\/h3>\r\n                    <ul>\r\n                        <li>Both families work-harden more rapidly than carbon steel. Use sharp tools,\r\n                            positive feed and adequate cutting fluids.<\/li>\r\n                        <li>For deep drawing or complex forming, generous radii and polished tools\r\n                            help reduce galling and surface damage.<\/li>\r\n                        <li>Cold-worked areas will have increased strength and hardness and may show\r\n                            slight magnetism.<\/li>\r\n                    <\/ul>\r\n                <\/section>\r\n\r\n                <!-- 7. \u5e94\u7528\u573a\u666f -->\r\n                <section id=\"applications\" class=\"ss-section\" style=\"background-color:#1d4ed8;color:#eff6ff;border-color:#1d4ed8;\">\r\n                    <h2 style=\"color:#ffffff;\">7. Typical Applications for 304L &amp; 316L<\/h2>\r\n                    <p style=\"color:#dbeafe;\">\r\n                        Both grade families appear side-by-side across many industries. In practice,\r\n                        the \u201cright\u201d choice is often a mixed strategy: 304L for less exposed parts,\r\n                        316L where chloride or chemical attack is concentrated.\r\n                    <\/p>\r\n\r\n                    <div class=\"ss-app-grid\">\r\n                        <div class=\"ss-app-card\">\r\n                            <h3>General industry (304L)<\/h3>\r\n                            <p>\r\n                                Tanks, hoppers, ducting, frames, platforms, enclosures and many\r\n                                components in clean industrial atmospheres where corrosion risk is\r\n                                moderate and easy to visually inspect.\r\n                            <\/p>\r\n                        <\/div>\r\n                        <div class=\"ss-app-card\">\r\n                            <h3>Marine &amp; coastal (316L)<\/h3>\r\n                            <p>\r\n                                Handrails, ladders, splash-zone piping, cable trays, dock hardware\r\n                                and fa\u00e7ade elements exposed to salt spray or coastal winds.\r\n                            <\/p>\r\n                        <\/div>\r\n                        <div class=\"ss-app-card\">\r\n                            <h3>Food &amp; beverage (304L \/ 316L)<\/h3>\r\n                            <p>\r\n                                304L widely used for many food contact surfaces; 316L preferred for\r\n                                brine, sauces with higher salt content, vinegar, and hot CIP systems.\r\n                            <\/p>\r\n                        <\/div>\r\n                        <div class=\"ss-app-card\">\r\n                            <h3>Pharma &amp; biotech (316L)<\/h3>\r\n                            <p>\r\n                                316L is the de-facto standard for high-purity water systems, sanitary\r\n                                pipework and vessels requiring repeated SIP\/CIP cycles.\r\n                            <\/p>\r\n                        <\/div>\r\n                    <\/div>\r\n                <\/section>\r\n\r\n                <!-- 8. \u8d28\u91cf\u4e0e\u4f9b\u8d27 -->\r\n                <section id=\"quality\" class=\"ss-section\">\r\n                    <h2>8. Quality Assurance, MTCs &amp; Supply Scope from Sunhyings<\/h2>\r\n                    <p>\r\n                        For B2B projects, documentation and traceability are just as important as\r\n                        the material itself. Sunhyings maintains a controlled supply chain with\r\n                        mill-backed documentation suitable for export projects.\r\n                    <\/p>\r\n                    <ul>\r\n                        <li><strong>Standards:<\/strong> ASTM A240 \/ A480, ASME SA240, EN 10088-2,\r\n                            EN 10028-7, GB\/T 3280 as required by project.<\/li>\r\n                        <li><strong>MTCs:<\/strong> EN 10204 3.1 Mill Test Certificates with full\r\n                            chemistry and mechanical test data, linked to heat numbers and plate\r\n                            markings.<\/li>\r\n                        <li><strong>Product forms:<\/strong> Hot rolled plate (No.1), cold rolled sheet\r\n                            &amp; coil (2B, BA), strip and blanks cut to drawing (laser, plasma,\r\n                            waterjet), with optional surface protection films.<\/li>\r\n                        <li><strong>Processing services:<\/strong> Cutting to size, edge preparation,\r\n                            basic forming and packing tailored to sea or land transport.<\/li>\r\n                    <\/ul>\r\n                <\/section>\r\n\r\n                <!-- 9. FAQ -->\r\n                <section id=\"faq\" class=\"ss-section\">\r\n                    <h2>9. FAQ \u2013 304 \/ 304L vs 316 \/ 316L<\/h2>\r\n\r\n                    <div class=\"ss-faq-item\">\r\n                        <div class=\"ss-faq-q\">Q1. Is 316 always \u201cbetter\u201d than 304?<\/div>\r\n                        <p>\r\n                            316 \/ 316L has better resistance to chlorides and some chemicals, but it\r\n                            is not automatically the best choice everywhere. In mild indoor\r\n                            environments, 304L often performs perfectly at lower cost. \u201cBetter\u201d\r\n                            should be evaluated against your real environment, lifetime and budget.\r\n                        <\/p>\r\n                    <\/div>\r\n\r\n                    <div class=\"ss-faq-item\">\r\n                        <div class=\"ss-faq-q\">Q2. Do I always need the L grade?<\/div>\r\n                        <p>\r\n                            Where welding is involved \u2013 especially for thicker plate, pressure\r\n                            equipment or critical service \u2013 Sunhyings generally recommends\r\n                            <strong>304L<\/strong> or <strong>316L<\/strong>. The low carbon level\r\n                            reduces the risk of weld sensitisation and intergranular corrosion\r\n                            without a major cost penalty for most markets.\r\n                        <\/p>\r\n                    <\/div>\r\n\r\n                    <div class=\"ss-faq-item\">\r\n                        <div class=\"ss-faq-q\">Q3. Will 304L or 316L be completely rust-free?<\/div>\r\n                        <p>\r\n                            \u201cStainless\u201d means much more resistant to corrosion than carbon steel, not\r\n                            completely immune in every environment. Tea-staining, pitting or rust\r\n                            staining can occur if the wrong grade is used, surfaces are rough, or\r\n                            deposits are allowed to build up. Correct grade selection plus good\r\n                            design and cleaning are all important.\r\n                        <\/p>\r\n                    <\/div>\r\n\r\n                    <div class=\"ss-faq-item\">\r\n                        <div class=\"ss-faq-q\">Q4. Can 304L \/ 316L be hardened by heat treatment?<\/div>\r\n                        <p>\r\n                            No. Both are austenitic grades and cannot be hardened by quench and\r\n                            temper. Strength can be increased by cold working. Solution annealing is\r\n                            used to restore corrosion resistance and relieve work hardening, not to\r\n                            create a hardened martensitic structure.\r\n                        <\/p>\r\n                    <\/div>\r\n                <\/section>\r\n\r\n                <!-- 10. \u4e0b\u8f7d + \u8054\u7cfb -->\r\n                <section id=\"downloads\" class=\"ss-section\">\r\n                    <h2>10. Downloads &amp; Talk to a Sunhyings Engineer<\/h2>\r\n                    <div class=\"ss-cta\">\r\n                        <p>\r\n                            Need help deciding between 304L and 316L for a specific project?\r\n                            Share your medium, temperature, pressure and environment, and our\r\n                            materials team will review and suggest practical plate and coil specs.\r\n                        <\/p>\r\n                    <\/div>\r\n\r\n                    <div style=\"margin-top:16px;display:grid;grid-template-columns:1fr;gap:16px;\">\r\n                        <div>\r\n                            <h3>Downloadable resources<\/h3>\r\n                            <ul>\r\n                                <li>304 \/ 304L &amp; 316 \/ 316L Technical Datasheet (PDF)<\/li>\r\n                                <li>Surface Finish Guide for Stainless Steel Plate &amp; Coil<\/li>\r\n                                <li>Fabrication &amp; Welding Checklist for Austenitic Stainless Steels<\/li>\r\n                            <\/ul>\r\n                            <a href=\"#\" class=\"ss-btn-secondary\">\r\n                                Download combined datasheet (PDF)\r\n                            <\/a>\r\n                        <\/div>\r\n                        <div id=\"contact\">\r\n                            <h3>Request a quote or technical suggestion<\/h3>\r\n                            <form>\r\n                                <div class=\"ss-form-grid\">\r\n                                    <div>\r\n                                        <label>Name<\/label>\r\n                                        <input type=\"text\" name=\"name\">\r\n                                    <\/div>\r\n                                    <div>\r\n                                        <label>Company<\/label>\r\n                                        <input type=\"text\" name=\"company\">\r\n                                    <\/div>\r\n                                    <div>\r\n                                        <label>Email<\/label>\r\n                                        <input type=\"email\" name=\"email\">\r\n                                    <\/div>\r\n                                    <div>\r\n                                        <label>Country \/ Region<\/label>\r\n                                        <input type=\"text\" name=\"country\">\r\n                                    <\/div>\r\n                                <\/div>\r\n                                <div style=\"margin-top:8px;\">\r\n                                    <label>Briefly describe your application<\/label>\r\n                                    <textarea name=\"message\" placeholder=\"Medium, temperature, pressure, environment (indoor, coastal, chemical, food, etc.)\"><\/textarea>\r\n                                <\/div>\r\n                                <div style=\"margin-top:10px;\">\r\n                                    <button type=\"submit\" class=\"ss-btn-primary\">\r\n                                        Send to Sunhyings engineering team\r\n                                    <\/button>\r\n                                <\/div>\r\n                            <\/form>\r\n                        <\/div>\r\n                    <\/div>\r\n                <\/section>\r\n\r\n            <\/main>\r\n        <\/div>\r\n    <\/div>\r\n<\/div>\r\n\r\n<!-- JSON-LD: Product family + FAQ\uff08\u53ef\u9009\uff0c\u4e0d\u9700\u8981\u53ef\u4ee5\u5220\u6389\u8fd9\u4e24\u6bb5 script\uff09 -->\r\n<script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"Product\",\r\n  \"name\": \"Stainless Steel 304 \/ 304L & 316 \/ 316L Plate and Coil\",\r\n  \"brand\": {\r\n    \"@type\": \"Brand\",\r\n    \"name\": \"Sunhyings\"\r\n  },\r\n  \"description\": \"Technical guide and supply of stainless steel 304 \/ 304L and 316 \/ 316L plate and coil with engineering support on grade selection, corrosion and fabrication.\",\r\n  \"category\": \"Stainless Steel Flat Products\",\r\n  \"material\": \"Stainless steel 304 \/ 304L (UNS S30400 \/ S30403, EN 1.4301 \/ 1.4307) and 316 \/ 316L (UNS S31600 \/ S31603, EN 1.4401 \/ 1.4404)\",\r\n  \"url\": \"https:\/\/sunhyings.com\/materials\/stainless-steel-304-316\",\r\n  \"manufacturer\": {\r\n    \"@type\": \"Organization\",\r\n    \"name\": \"Sunhyings\",\r\n    \"url\": \"https:\/\/sunhyings.com\"\r\n  }\r\n}\r\n<\/script>\r\n\r\n<script type=\"application\/ld+json\">\r\n{\r\n  \"@context\":\"https:\/\/schema.org\",\r\n  \"@type\":\"FAQPage\",\r\n  \"mainEntity\":[\r\n    {\r\n      \"@type\":\"Question\",\r\n      \"name\":\"Is 316 stainless steel always better than 304?\",\r\n      \"acceptedAnswer\":{\r\n        \"@type\":\"Answer\",\r\n        \"text\":\"316 has better resistance to chlorides and some chemicals than 304, but it is not automatically the best choice everywhere. In mild indoor environments, 304L often performs perfectly at lower cost. The best grade should be chosen based on the real environment, lifetime and budget.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\":\"Question\",\r\n      \"name\":\"Do I always need 304L or 316L instead of 304 or 316?\",\r\n      \"acceptedAnswer\":{\r\n        \"@type\":\"Answer\",\r\n        \"text\":\"Where welding is involved, especially on thicker plate or pressure equipment, 304L or 316L is normally preferred because the lower carbon level reduces the risk of weld sensitisation and intergranular corrosion, without a major cost penalty.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\":\"Question\",\r\n      \"name\":\"Will 304L or 316L be completely rust free?\",\r\n      \"acceptedAnswer\":{\r\n        \"@type\":\"Answer\",\r\n        \"text\":\"Stainless means much more resistant to corrosion than carbon steel, not completely immune in every environment. Tea-staining, pitting or rust staining can still occur if the wrong grade is used, surfaces are rough, or deposits and chlorides are allowed to build up. Correct grade selection, good design and regular cleaning are all important.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\":\"Question\",\r\n      \"name\":\"Can 304L or 316L be hardened by heat treatment?\",\r\n      \"acceptedAnswer\":{\r\n        \"@type\":\"Answer\",\r\n        \"text\":\"No. 304L and 316L are austenitic grades and cannot be hardened by quench and temper. Strength can be increased by cold working. Solution annealing is used to restore corrosion resistance and relieve work hardening, not to create a hardened martensitic structure.\"\r\n      }\r\n    }\r\n  ]\r\n}\r\n<\/script>\r\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Stainless Steel Material Selection Guide Stainless Steel 304 \/ 304L &amp; 316 \/ 316L Material &amp; Sourcing Guide Practical, engineer-level handbook for choosing between 304 \/ 304L and 316 \/ 316L in process equipment, marine hardware and hygienic applications. Prepared by Sunhyings materials engineers. Side-by-side comparison of chemistry, properties and corrosion behaviour. When 304\/304L is [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":6009,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-6609","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/sunhyings.com\/de\/wp-json\/wp\/v2\/pages\/6609","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sunhyings.com\/de\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/sunhyings.com\/de\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/sunhyings.com\/de\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sunhyings.com\/de\/wp-json\/wp\/v2\/comments?post=6609"}],"version-history":[{"count":46,"href":"https:\/\/sunhyings.com\/de\/wp-json\/wp\/v2\/pages\/6609\/revisions"}],"predecessor-version":[{"id":7141,"href":"https:\/\/sunhyings.com\/de\/wp-json\/wp\/v2\/pages\/6609\/revisions\/7141"}],"up":[{"embeddable":true,"href":"https:\/\/sunhyings.com\/de\/wp-json\/wp\/v2\/pages\/6009"}],"wp:attachment":[{"href":"https:\/\/sunhyings.com\/de\/wp-json\/wp\/v2\/media?parent=6609"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}