{"id":596,"date":"2026-09-22T16:07:55","date_gmt":"2026-09-22T10:37:55","guid":{"rendered":"https:\/\/www.calicometal.com\/blog\/?p=596"},"modified":"2026-09-29T16:12:28","modified_gmt":"2026-09-29T10:42:28","slug":"en-1-4547-vs-en-1-4462-plates-key-differences","status":"publish","type":"post","link":"https:\/\/www.calicometal.com\/blog\/en-1-4547-vs-en-1-4462-plates-key-differences\/","title":{"rendered":"EN 1.4547 vs EN 1.4462 Plates: Key Differences"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">EN 1.4547 and EN 1.4462 are both corrosion-resistant stainless steel grades built for demanding environments, though they get there through different metallurgy. EN 1.4547 is 254 SMO, a high-alloy austenitic grade, while EN 1.4462 is a duplex grade commonly known as 2205. Their different structures produce real differences in corrosion resistance, strength, and application fit.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What Are EN 1.4547 and EN 1.4462 Plates?<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>EN 1.4547 Plates<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.calicometal.com\/products\/smo-254\/plates.html\">EN 1.4547 Plates<\/a> are known commercially as 254 SMO, a super-austenitic grade with high chromium, nickel and nitrogen content. Its defining feature is a molybdenum level around 6%, well above standard grades, driving its chloride resistance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>EN 1.4462 Plates<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.calicometal.com\/products\/duplex-steel\/sheets\/s31803.html\">EN 1.4462 Plates<\/a> carry a balanced austenitic-ferritic structure, roughly 22% chromium and 3% molybdenum. That dual-phase structure gives it a different strength and corrosion profile from EN 1.4547.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>EN 1.4547 vs EN 1.4462: Key Differences<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The table below sets out how the two grades compare on the factors that matter most.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Factor<\/strong><\/td><td><strong>EN 1.4547 Plates<\/strong><\/td><td><strong>EN 1.4462 Plates<\/strong><\/td><\/tr><tr><td>Material Type<\/td><td>Austenitic stainless steel<\/td><td>Duplex stainless steel<\/td><\/tr><tr><td>Common Grade<\/td><td>254 SMO<\/td><td>2205<\/td><\/tr><tr><td>Chromium<\/td><td>Around 19.5\u201320.5%<\/td><td>Around 21\u201323%<\/td><\/tr><tr><td>Molybdenum<\/td><td>Around 6\u20137%<\/td><td>Around 2.5\u20133.5%<\/td><\/tr><tr><td>Nitrogen<\/td><td>Relatively high<\/td><td>Added for strength and resistance<\/td><\/tr><tr><td>Pitting Resistance<\/td><td>Very high<\/td><td>High<\/td><\/tr><tr><td>Stress Corrosion Cracking Resistance<\/td><td>Very good<\/td><td>Particularly strong due to duplex structure<\/td><\/tr><tr><td>Mechanical Strength<\/td><td>High<\/td><td>Generally higher yield strength<\/td><\/tr><tr><td>Typical Selection<\/td><td>Severe chloride and localized corrosion<\/td><td>Strength combined with corrosion resistance<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Exact composition and properties should be checked against the applicable product specification.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>How Does Their Corrosion Resistance Compare?<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Pitting and Crevice Corrosion<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The higher molybdenum in EN 1.4547 gives it a strong edge in chloride-rich environments, where <a href=\"https:\/\/en.wikipedia.org\/wiki\/Crevice_corrosion\">crevice corrosion<\/a> and pitting attack weaker alloys fastest. EN 1.4462 still provides good pitting resistance through its own chromium, molybdenum, and nitrogen, though not usually to the same degree.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Stress Corrosion Cracking<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">EN 1.4462&#8217;s duplex structure is specifically valued for stress corrosion cracking resistance, a property its ferritic phase contributes. EN 1.4547 still offers strong resistance, but duplex construction gives EN 1.4462 the edge here.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Which Grade Offers Higher Mechanical Strength?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">EN 1.4462&#8217;s duplex structure, combining austenitic and ferritic phases, generally delivers higher yield strength than EN 1.4547&#8217;s austenitic structure. That strength can support reduced thickness, making EN 1.4462 the common choice when strength and corrosion resistance both matter.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Where Are EN 1.4547 Plates Commonly Used?<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Seawater Equipment<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Direct seawater contact demands strong resistance to chloride-driven pitting.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Chemical Processing Equipment<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Aggressive process chemicals that pit standard stainless call for EN 1.4547&#8217;s higher alloy content.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Desalination Systems<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">High-salinity streams test pitting resistance harder than most applications.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Pulp and Paper Equipment<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Chloride-bearing liquors favour EN 1.4547&#8217;s resistance to localized attack.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Heat Exchangers<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Exchanger surfaces in chloride-rich media benefit from strong crevice corrosion resistance at joints.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Where Are EN 1.4462 Plates Commonly Used?<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Oil and Gas Equipment<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Combined pressure and corrosion in oil and gas systems suit EN 1.4462&#8217;s strength and resistance together.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Chemical Processing<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Equipment needing solid corrosion resistance without EN 1.4547&#8217;s added cost often specifies EN 1.4462.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Pressure Vessels<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Higher yield strength lets EN 1.4462 support vessel design where wall thickness matters.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Structural Components<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Load-bearing structural applications draw on its mechanical strength and corrosion resistance together.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Marine Equipment<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Marine components needing stress corrosion cracking resistance alongside strength commonly specify EN 1.4462.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>How Should You Choose Between EN 1.4547 and EN 1.4462?<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Chloride concentration<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Higher chloride levels push the choice toward EN 1.4547.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Pitting and crevice corrosion risk<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Localized-attack-prone environments favour EN 1.4547 over standard duplex grades.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Mechanical loading<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Significant structural load benefits from EN 1.4462&#8217;s higher yield strength.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Required yield strength<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Where reduced wall thickness matters, EN 1.4462&#8217;s strength often decides it.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Operating temperature<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Elevated temperatures affect both grades differently; check the specification.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Marine or chemical exposure<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Specific chemistry, not general severity alone, should guide the choice.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Plate thickness<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Available thickness ranges differ by grade and supplier; confirm before ordering.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Welding and fabrication requirements<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Duplex EN 1.4462 needs different welding procedures to preserve its phase balance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Applicable material standards<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Project specifications often name one grade directly, overriding general preference.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Is EN 1.4547 Always Better Than EN 1.4462 for Corrosion Resistance?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Higher alloy content doesn&#8217;t automatically make one grade the best choice for every job. EN 1.4547 is often preferred where pitting resistance is the deciding factor. EN 1.4462 offers a strong combination of corrosion resistance and mechanical strength, often at lower cost.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Conclusion<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">EN 1.4547 and EN 1.4462 serve different selection requirements rather than competing on one measure. EN 1.4547 suits severe localized corrosion and heavy chloride exposure; EN 1.4462 offers a strong mix of corrosion resistance, stress corrosion cracking resistance, and mechanical strength. The final choice should rest on the service environment, loading, and applicable specifications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>EN 1.4547 and EN 1.4462 are both corrosion-resistant stainless steel grades built for demanding environments, though they get there through different metallurgy. EN 1.4547 is 254 SMO, a high-alloy austenitic grade, while EN 1.4462 is a duplex grade commonly known as 2205. Their different structures produce real differences in corrosion resistance, strength, and application fit. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":598,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-596","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-plates-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>EN 1.4547 vs EN 1.4462: Plate Grade Comparison<\/title>\n<meta name=\"description\" content=\"Compare EN 1.4547 and EN 1.4462 plates based on corrosion resistance, strength, composition, applications &amp; service conditions. 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