--- title: "GB steel grades — 1318 designations — Page 22" description: "Steel grades designated under GB, with chemical composition, mechanical properties and equivalents in other standards. 1318 designations across 991…" canonical: https://steelequivalents.com/materials/gb/page/22 language: en robots: index, follow og_type: website type: material-standard language_alternates: en: https://steelequivalents.com/materials/gb/page/22.md cs: https://steelequivalents.com/cs/materiály/gb.md de: https://steelequivalents.com/de/werkstoffe/gb.md es: https://steelequivalents.com/es/materiales/gb.md fr: https://steelequivalents.com/fr/matériaux/gb.md hu: https://steelequivalents.com/hu/anyagok/gb.md it: https://steelequivalents.com/it/materiali/gb.md nl: https://steelequivalents.com/nl/materialen/gb.md pl: https://steelequivalents.com/pl/materiały/gb.md pt: https://steelequivalents.com/pt/materiais/gb.md ru: https://steelequivalents.com/ru/материалы/gb.md tr: https://steelequivalents.com/tr/malzemeler/gb.md zh: https://steelequivalents.com/zh/材料/gb.md ja: https://steelequivalents.com/ja/材料/gb.md ar: https://steelequivalents.com/ar/المواد/gb.md ko: https://steelequivalents.com/ko/재료/gb.md pt-br: https://steelequivalents.com/pt-br/materiais/gb.md hi: https://steelequivalents.com/hi/सामग्री/gb.md content_hash: sha256:35d874ff89a0683865f7594350666c2bb5496d178c15e061e86c2c46cc2e4dfb generated: 2026-09-26 --- > **Machine-readable Markdown rendering.** This is a Markdown representation of a web page, > served for AI agents and crawlers as a token-efficient alternative to the full HTML. > Full interactive HTML version: https://steelequivalents.com/materials/gb/page/22 > Canonical URL: https://steelequivalents.com/materials/gb/page/22 > Available languages: en, cs, de, es, fr, hu, it, nl, pl, pt, ru, tr, zh, ja, ar, ko, pt-br, hi > Change detection: `content_hash` is the SHA-256 of this document's Markdown body — everything > below this block, whitespace-trimmed, excluding the front-matter. Compare it to detect a real > content change; `generated` moves on every render and is not a change signal. GB · 1,318 grades # GB steel grades — 1318 designations — Page 22 Every grade designated under GB, with the identifying and comparative data we hold for each. Open a grade for its full composition, properties and its designations in other standards. Unless marked, every name here is an asserted identity — the same grade under this standard’s own designation. 9 of 50 rows differ and carry an “Indicative” mark. ## Also known as 1318 designations | Grade | C% by weight | |---|---| | [Q355B](/materials/gb/q355b "Q355B") | ≤ 0.2 | | [Q355GNH](/materials/gb/q355gnh "Q355GNH") | ≤ 0.12 | | [Q355MB](/materials/gb/q355mb "Q355MB") | ≤ 0.14 | | [Q355MC](/materials/gb/q355mc "Q355MC") | ≤ 0.14 | | [Q355MD](/materials/gb/q355md "Q355MD") | ≤ 0.14 | | [Q355ME](/materials/gb/q355me "Q355ME") | ≤ 0.14 | | [Q355MF](/materials/gb/q355mf "Q355MF") | ≤ 0.14 | | [Q355NB](/materials/gb/q355nb "Q355NB") | ≤ 0.2 | | [Q355NC](/materials/gb/q355nc "Q355NC") | ≤ 0.2 | | [Q355ND](/materials/gb/q355nd "Q355ND") | ≤ 0.2 | | [Q355NE](/materials/gb/q355ne "Q355NE") | ≤ 0.18 | | [Q355NF](/materials/gb/q355nf "Q355NF") | ≤ 0.16 | | [Q355NH](/materials/gb/q355nh "Q355NH") | ≤ 0.16 | | [Q370R](/materials/gb/q370r "Q370R") | ≤ 0.18 | | [Q390A](/materials/gb/q390a "Q390A") | ≤ 0.2 | | [Q390B](/materials/gb/q390b "Q390B") | ≤ 0.2 | | [Q390C](/materials/gb/q390c "Q390C") Indicative | — | | [Q390C](/materials/gb/q390c "Q390C") Indicative | — | | [Q390D](/materials/gb/q390d "Q390D") | ≤ 0.2 | | [Q390E](/materials/gb/q390e "Q390E") | ≤ 0.2 | | [Q390GNH](/materials/gb/q390gnh "Q390GNH") | ≤ 0.12 | | [Q390MB](/materials/gb/q390mb "Q390MB") | ≤ 0.15 | | [Q390MC](/materials/gb/q390mc "Q390MC") | ≤ 0.15 | | [Q390MD](/materials/gb/q390md "Q390MD") | ≤ 0.15 | | [Q390ME](/materials/gb/q390me "Q390ME") | ≤ 0.15 | | [Q390NB](/materials/gb/q390nb "Q390NB") | ≤ 0.2 | | [Q390NC](/materials/gb/q390nc "Q390NC") | ≤ 0.2 | | [Q390ND](/materials/gb/q390nd "Q390ND") | ≤ 0.2 | | [Q390NE](/materials/gb/q390ne "Q390NE") | ≤ 0.2 | | [Q420A](/materials/gb/q420a "Q420A") | ≤ 0.2 | | [Q420B](/materials/gb/q420b "Q420B") | ≤ 0.2 | | [Q420C](/materials/gb/q420c "Q420C") Indicative | ≤ 0.2 | | [Q420D](/materials/gb/q420d "Q420D") Indicative | ≤ 0.2 | | [Q420E](/materials/gb/q420e "Q420E") Indicative | ≤ 0.2 | | [Q420MB](/materials/gb/q420mb "Q420MB") | ≤ 0.16 | | [Q420MC](/materials/gb/q420mc "Q420MC") | ≤ 0.16 | | [Q420MD](/materials/gb/q420md "Q420MD") | ≤ 0.16 | | [Q420ME](/materials/gb/q420me "Q420ME") | ≤ 0.16 | | [Q420NB](/materials/gb/q420nb "Q420NB") | ≤ 0.2 | | [Q420NC](/materials/gb/q420nc "Q420NC") | ≤ 0.2 | | [Q420ND](/materials/gb/q420nd "Q420ND") | ≤ 0.2 | | [Q420NE](/materials/gb/q420ne "Q420NE") | ≤ 0.2 | | [Q420R](/materials/gb/q420r "Q420R") | ≤ 0.2 | | [Q460C](/materials/gb/q460c "Q460C") Indicative | ≤ 0.2 | | [Q460C](/materials/gb/q460c "Q460C") Indicative | 0.2–0.23 | | [Q460D](/materials/gb/q460d "Q460D") Indicative | ≤ 0.2 | | [Q460DR](/materials/gb/q460dr "Q460DR") | ≤ 0.2 | | [Q460E](/materials/gb/q460e "Q460E") Indicative | ≤ 0.2 | | [Q460F](/materials/gb/q460f "Q460F") | ≤ 0.2 | | [Q460MC](/materials/gb/q460mc "Q460MC") | ≤ 0.16 | **This grade’s own name** — recorded in our sources as this grade’s own designation under that standard. **Indicative** — taken from a published cross-reference table; a close match, not a guarantee of interchangeability. Verify against the mill certificate before ordering. **Withdrawn** — designation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once. [Previous](/materials/gb/page/21 "Previous") Page 22 of 27[Next](/materials/gb/page/23 "Next")