{"id":6798,"date":"2026-11-02T05:10:20","date_gmt":"2026-11-02T05:10:20","guid":{"rendered":"https:\/\/www.ggsteelstruct.com\/?p=6798"},"modified":"2026-11-04T06:51:23","modified_gmt":"2026-11-04T06:51:23","slug":"steel-grade-equivalents","status":"publish","type":"post","link":"https:\/\/www.ggsteelstruct.com\/vi\/resources\/steel-grade-equivalents\/","title":{"rendered":"Structural steel grade equivalents: GB vs ASTM vs EN vs AS\/NZS"},"content":{"rendered":"
\"CNC<\/figure>\n\n\n\n

“Equivalent” grades have similar minimum yield strength. They are not identical: chemistry, impact testing, thickness limits and tolerances differ. Any substitution needs the engineer of record’s approval.<\/p>\n\n\n\n

Approximate equivalents<\/h2>\n\n\n\n
China (GB\/T 1591, 700)<\/th>Min. yield (\u226416 mm)<\/th>USA (ASTM)<\/th>Europe (EN 10025)<\/th>Australia (AS\/NZS)<\/th><\/tr><\/thead>
Q235B<\/th>235 MPa<\/td>A36 (250 MPa)<\/td>S235JR<\/td>250<\/td><\/tr>
Q355B<\/th>355 MPa<\/td>A572 Gr50 \/ A992 (345 MPa)<\/td>S355JR<\/td>350<\/td><\/tr>
Q390<\/th>390 MPa<\/td>A572 Gr55 (380 MPa)<\/td>\u2014<\/td>\u2014<\/td><\/tr>
Q420<\/th>420 MPa<\/td>A572 Gr60 (415 MPa)<\/td>S420<\/td>\u2014<\/td><\/tr>
Q460<\/th>460 MPa<\/td>A572 Gr65 (450 MPa)<\/td>S460<\/td>450<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Approximate comparison for planning. Check thickness-dependent yield values in each standard.<\/p>\n\n\n\n

Impact test suffixes<\/h2>\n\n\n\n
Charpy test temperature<\/th>GB suffix<\/th>EN suffix<\/th><\/tr><\/thead>
+20 \u00b0C<\/th>B<\/td>JR<\/td><\/tr>
0 \u00b0C<\/th>C<\/td>J0<\/td><\/tr>
\u221220 \u00b0C<\/th>D<\/td>J2<\/td><\/tr>
\u221240 \u00b0C<\/th>E<\/td>K2 \/ NL<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

GJ grades for building structures<\/h2>\n\n\n\n

Q345GJ and Q420GJ (GB\/T 19879) are plates for building structures with tighter yield ranges, lower yield-to-tensile ratios and through-thickness options. Zengcheng New World used Q420GJC.<\/p>\n\n\n\n

Substitution rule:<\/strong> propose, document and get written approval before ordering. Never substitute silently.<\/p>","protected":false},"excerpt":{"rendered":"

Q235B, Q355B, Q390 and Q420 compared with ASTM A36, A572 and A992, EN S235 to S420 and AS\/NZS grades: yield strength, impact tests and when substitution needs approval.<\/p>","protected":false},"author":1,"featured_media":7263,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_aseo_title":"Steel Grade Equivalents: GB, ASTM, EN, AS\/NZS | GG Steel","_aseo_desc":"Q235B, Q355B, Q390 and Q420 compared with ASTM A36, A572 and A992, EN S235 to S420 and AS\/NZS grades: yield strength, impact tests and when substitution needs approval. Read the comparison.","_aseo_noindex":false,"_aseo_og_image":0,"_aseo_schema_type":""},"categories":[31],"tags":[],"class_list":["post-6798","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-standards"],"_links":{"self":[{"href":"https:\/\/www.ggsteelstruct.com\/vi\/wp-json\/wp\/v2\/posts\/6798","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ggsteelstruct.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ggsteelstruct.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ggsteelstruct.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ggsteelstruct.com\/vi\/wp-json\/wp\/v2\/comments?post=6798"}],"version-history":[{"count":5,"href":"https:\/\/www.ggsteelstruct.com\/vi\/wp-json\/wp\/v2\/posts\/6798\/revisions"}],"predecessor-version":[{"id":7282,"href":"https:\/\/www.ggsteelstruct.com\/vi\/wp-json\/wp\/v2\/posts\/6798\/revisions\/7282"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ggsteelstruct.com\/vi\/wp-json\/wp\/v2\/media\/7263"}],"wp:attachment":[{"href":"https:\/\/www.ggsteelstruct.com\/vi\/wp-json\/wp\/v2\/media?parent=6798"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ggsteelstruct.com\/vi\/wp-json\/wp\/v2\/categories?post=6798"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ggsteelstruct.com\/vi\/wp-json\/wp\/v2\/tags?post=6798"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}