--- title: "GB steel grades — 1318 designations — Page 23" 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/23 language: en robots: index, follow og_type: website type: material-standard language_alternates: en: https://steelequivalents.com/materials/gb/page/23.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: sha256:80638a7253d38beaf814e861f3a9c05a0194689b912faf09db5461dcb728dce7 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/23 > Canonical URL: https://steelequivalents.com/materials/gb/page/23 > 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 23 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. 2 of 50 rows differ and carry an “Indicative” mark. ## Also known as 1318 designations | Grade | C% by weight | |---|---| | [Q460MD](/materials/gb/q460md "Q460MD") | ≤ 0.16 | | [Q460ME](/materials/gb/q460me "Q460ME") | ≤ 0.16 | | [Q460NC](/materials/gb/q460nc "Q460NC") | ≤ 0.2 | | [Q460ND](/materials/gb/q460nd "Q460ND") | ≤ 0.2 | | [Q460NE](/materials/gb/q460ne "Q460NE") | ≤ 0.2 | | [Q460NH](/materials/gb/q460nh "Q460NH") | ≤ 0.12 | | [Q460R](/materials/gb/q460r "Q460R") | ≤ 0.2 | | [Q500C](/materials/gb/q500c "Q500C") | ≤ 0.2 | | [Q500D](/materials/gb/q500d "Q500D") | ≤ 0.2 | | [Q500E](/materials/gb/q500e "Q500E") | ≤ 0.2 | | [Q500F](/materials/gb/q500f "Q500F") | ≤ 0.2 | | [Q500MC](/materials/gb/q500mc "Q500MC") | ≤ 0.18 | | [Q500MD](/materials/gb/q500md "Q500MD") | ≤ 0.18 | | [Q500ME](/materials/gb/q500me "Q500ME") | ≤ 0.18 | | [Q550C](/materials/gb/q550c "Q550C") | ≤ 0.2 | | [Q550D](/materials/gb/q550d "Q550D") | ≤ 0.2 | | [Q550E](/materials/gb/q550e "Q550E") | ≤ 0.2 | | [Q550F](/materials/gb/q550f "Q550F") | ≤ 0.2 | | [Q550MC](/materials/gb/q550mc "Q550MC") | ≤ 0.18 | | [Q550MD](/materials/gb/q550md "Q550MD") | ≤ 0.18 | | [Q550ME](/materials/gb/q550me "Q550ME") | ≤ 0.18 | | [Q550NH](/materials/gb/q550nh "Q550NH") | ≤ 0.16 | | [Q620C](/materials/gb/q620c "Q620C") | ≤ 0.2 | | [Q620D](/materials/gb/q620d "Q620D") | ≤ 0.2 | | [Q620E](/materials/gb/q620e "Q620E") | ≤ 0.2 | | [Q620F](/materials/gb/q620f "Q620F") | ≤ 0.2 | | [Q620MC](/materials/gb/q620mc "Q620MC") | ≤ 0.18 | | [Q620MD](/materials/gb/q620md "Q620MD") | ≤ 0.18 | | [Q620ME](/materials/gb/q620me "Q620ME") | ≤ 0.18 | | [Q690C](/materials/gb/q690c "Q690C") | ≤ 0.2 | | [Q690D](/materials/gb/q690d "Q690D") | ≤ 0.2 | | [Q690E](/materials/gb/q690e "Q690E") | ≤ 0.2 | | [Q690F](/materials/gb/q690f "Q690F") | ≤ 0.2 | | [Q690MC](/materials/gb/q690mc "Q690MC") | ≤ 0.18 | | [Q690MD](/materials/gb/q690md "Q690MD") | ≤ 0.18 | | [Q690ME](/materials/gb/q690me "Q690ME") | ≤ 0.18 | | [Q800C](/materials/gb/q800c "Q800C") | ≤ 0.2 | | [Q800D](/materials/gb/q800d "Q800D") | ≤ 0.2 | | [Q800E](/materials/gb/q800e "Q800E") | ≤ 0.2 | | [Q800F](/materials/gb/q800f "Q800F") | ≤ 0.2 | | [Q890C](/materials/gb/q890c "Q890C") | ≤ 0.2 | | [Q890D](/materials/gb/q890d "Q890D") | ≤ 0.2 | | [Q890E](/materials/gb/q890e "Q890E") | ≤ 0.2 | | [Q890F](/materials/gb/q890f "Q890F") | ≤ 0.2 | | [Q960C](/materials/gb/q960c "Q960C") | ≤ 0.2 | | [Q960D](/materials/gb/q960d "Q960D") | ≤ 0.2 | | [Q960E](/materials/gb/q960e "Q960E") | ≤ 0.2 | | [Q960F](/materials/gb/q960f "Q960F") | ≤ 0.2 | | [QT400-15](/materials/gb/qt400-15 "QT400-15") Indicative | — | | [QT400-15](/materials/gb/qt400-15 "QT400-15") Indicative | — | **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/22 "Previous") Page 23 of 27[Next](/materials/gb/page/24 "Next")