{"id":69546,"date":"2026-05-17T17:26:53","date_gmt":"2026-05-17T17:26:53","guid":{"rendered":"https:\/\/evgroupchina.com\/encyclopedia-of-metal\/jis-g4312\/"},"modified":"2026-05-19T15:29:29","modified_gmt":"2026-05-19T15:29:29","slug":"jis-g4312","status":"publish","type":"wiki","link":"https:\/\/evgroupchina.com\/en\/encyclopedia-of-metal\/jis-g4312\/","title":{"rendered":"JIS G4312"},"content":{"rendered":"

Technical requirements for heat-resistant steel sheets according to JIS G4312<\/h2>\n

This regulatory document establishes a comprehensive set of technical requirements for the production, classification, and quality characteristics of heat-resistant steel plates, sheet material, and steel strips supplied by EV Group China. The standard defines the physical and chemical parameters of products operated under high-temperature loads.<\/p>\n

Reference information:<\/em><\/p>\n

This standard is based on the provisions of the international standard ISO 4955:2005 (with modifications). The degree of compliance with ISO standards is classified according to the ISO\/IEC Guide 21-1 (IDT \u2014 identical, MOD \u2014 modified, NEQ \u2014 non-equivalent).<\/p>\n

In accordance with the requirements of JIS G4312, the entire range of heat-resistant rolled products, including sheet material and strips, is divided into 28 categories. A detailed classification of steel grades is presented in the table below.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Steel Grade a)b)<\/sup><\/th>\nClassification<\/th>\nSteel Grade a)b)<\/sup><\/th>\nClassification<\/th>\n<\/tr>\n<\/thead>\n
SUH309<\/td>\nAustenitic class<\/td>\nSUS317<\/td>\nAustenitic class<\/td>\n<\/tr>\n
SUH310<\/td>\nSUS321<\/td>\n<\/tr>\n
SUH330<\/td>\nSUS347<\/td>\n<\/tr>\n
SUH660<\/td>\nSUSXM15J1<\/td>\n<\/tr>\n
SUH661<\/td>\nSUS405<\/td>\nFerritic class<\/td>\n<\/tr>\n
SUH21<\/td>\nFerritic class<\/td>\nSUS410L<\/td>\n<\/tr>\n
SUH409<\/td>\nSUS430<\/td>\n<\/tr>\n
SUH409L<\/td>\nSUS430J1L<\/td>\n<\/tr>\n
SUH446<\/td>\nSUS436J1L<\/td>\n<\/tr>\n
SUS302B<\/td>\nAustenitic class<\/td>\nSUS403<\/td>\nMartensitic class<\/td>\n<\/tr>\n
SUS304<\/td>\nSUS410<\/td>\n<\/tr>\n
SUS309S<\/td>\nSUS630<\/td>\nPrecipitation-hardening class<\/td>\n<\/tr>\n
SUS310S<\/td>\nSUS631<\/td>\n<\/tr>\n
SUS316<\/td>\n–<\/td>\n<\/tr>\n
SUS316Ti<\/td>\n–<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Expert note:<\/em> The status of grades SUH330, SUH660, and SUH446 is subject to revision as part of the standard update process.<\/p>\n

a)<\/sup> To identify sheet products, suffixes are added to the steel grade designation: “-HP” for hot-rolled sheets and plates, “-CP” for cold-rolled products. Marking example: SUH309-HP.<\/em><\/p>\n

b)<\/sup> For steel strips, the following suffixes are used: “-HS” (hot-rolled) and “-CS” (cold-rolled). Marking example: SUH409-CS.<\/em><\/p>\n

EV Group China specialists are ready to provide professional consultation on selecting steel grades for operation in aggressive thermal environments.<\/p>\n","protected":false},"featured_media":0,"template":"","meta":[],"wiki_category":[118],"class_list":["post-69546","wiki","type-wiki","status-publish","hentry","wiki_category-jis"],"_links":{"self":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki\/69546","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki\/69546\/revisions"}],"wp:attachment":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/media?parent=69546"}],"wp:term":[{"taxonomy":"wiki_category","embeddable":true,"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki_category?post=69546"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}