--- title: "GB steel grades — 1318 designations — Page 13" 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/13 language: en robots: index, follow og_type: website type: material-standard language_alternates: en: https://steelequivalents.com/materials/gb/page/13.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: sha256:54157c35034bf00cf547d5033001f103b4f3082a62496eeab6a0c6694e42fc27 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/13 > Canonical URL: https://steelequivalents.com/materials/gb/page/13 > 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 13 Every grade designated under GB, with the material number it maps to, what kind of steel it is, its carbon window and how many other standards carry it. 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. 22 of 50 rows differ and carry an “Indicative” mark. ## Also known as 1318 designations | Grade | Material no. | Category | C% by weight | Also in other standards | |---|---|---|---|---| | [4Cr2Mn1MoS](/materials/gb/4cr2mn1mos "4Cr2Mn1MoS") | — | — | 0.35–0.45 | — | | [4Cr3Mo3SiV](/materials/gb/4cr3mo3siv "4Cr3Mo3SiV") | — | — | 0.35–0.45 | — | | [4Cr5Mo2V](/materials/gb/4cr5mo2v "4Cr5Mo2V") | — | — | 0.32–0.43 | — | | [4Cr5Mo3V](/materials/gb/4cr5mo3v "4Cr5Mo3V") | — | — | 0.35–0.4 | — | | [4Cr5MoSiV](/materials/gb/4cr5mosiv "4Cr5MoSiV") Indicative | [1.2343](/materials/material-no/1.2343 "1.2343") | Tool steels for hot work | 0.33–0.41 | 20 | | [4Cr5MoSiV1](/materials/gb/4cr5mosiv1 "4Cr5MoSiV1") Indicative | [1.2344](/materials/material-no/1.2344 "1.2344") | Tool steels for hot work | 0.35–0.42 | 20 | | [4Cr5MoWVSi](/materials/gb/4cr5mowvsi "4Cr5MoWVSi") | — | — | 0.32–0.4 | — | | [4Cr5W2VSi](/materials/gb/4cr5w2vsi "4Cr5W2VSi") | — | — | 0.32–0.42 | — | | [4Cr9Si2](/materials/gb/4cr9si2 "4Cr9Si2") Indicative | [1.4718](/materials/material-no/1.4718 "1.4718") | Valve steels | 0.4–0.5 | 16 | | [4Cr9Si2](/materials/gb/4cr9si2 "4Cr9Si2") Indicative | [1.4718](/materials/material-no/1.4718 "1.4718") | Others | 0.4–0.5 | 16 | | [4Cr9Si8](/materials/din-en/4cr9si8 "4Cr9Si8") Indicative | [1.4718](/materials/material-no/1.4718 "1.4718") | Valve steels | 0.4–0.5 | 16 | | [4Cr9Si8](/materials/din-en/4cr9si8 "4Cr9Si8") Indicative | [1.4718](/materials/material-no/1.4718 "1.4718") | Others | 0.4–0.5 | 16 | | [4CrMnSiMoV](/materials/gb/4crmnsimov "4CrMnSiMoV") | — | — | 0.35–0.45 | — | | [4CrNi4Mo](/materials/gb/4crni4mo "4CrNi4Mo") | — | — | 0.4–0.5 | — | | [4CrW2Si](/materials/gb/4crw2si "4CrW2Si") | — | — | 0.35–0.45 | 5 | | [50](/materials/bds/50 "50") Indicative | [1.1171](/materials/material-no/1.1171 "1.1171") | Others | 0.48–0.52 | 6 | | [50](/materials/bds/50 "50") Indicative | [1.1201](/materials/material-no/1.1201 "1.1201") | Quenched and tempered steels | 0.42–0.5 | 11 | | [50](/materials/bds/50 "50") Indicative | [1.9505](/materials/material-no/1.9505 "1.9505") | Others | 0.46–0.53 | 6 | | [50](/materials/bds/50 "50") Indicative | [1.1210](/materials/material-no/1.1210 "1.1210") | Steels for surface hardening | 0.5–0.57 | 8 | | [50](/materials/bds/50 "50") Indicative | [1.0540](/materials/material-no/1.0540 "1.0540") | Quenched and tempered steels | 0.47–0.55 | 13 | | [50](/materials/bds/50 "50") Indicative | [1.0535](/materials/material-no/1.0535 "1.0535") | Quenched and tempered steels | 0.52–0.6 | 21 | | [50](/materials/bds/50 "50") Indicative | [1.1213](/materials/material-no/1.1213 "1.1213") | Steels for surface hardening | 0.5–0.57 | 11 | | [50B](/materials/gb/50b "50B") | [1.0045](/materials/material-no/1.0045 "1.0045") | Unalloyed structural steels | ≤ 0.24 | 17 | | [50Cr](/materials/gb/50cr "50Cr") | — | — | 0.47–0.54 | — | | [50Cr15MoV](/materials/gb/50cr15mov "50Cr15MoV") | — | — | 0.45–0.55 | — | | [50CrMn](/materials/gb/50crmn "50CrMn") | — | — | 0.46–0.54 | — | | [50CrMo](/materials/gb/50crmo "50CrMo") Indicative | [1.7228](/materials/material-no/1.7228 "1.7228") | Quenched and tempered steels | 0.46–0.54 | 12 | | [50CrV](/materials/gb/50crv "50CrV") | — | — | 0.46–0.54 | — | | [50CrVA](/materials/gb/50crva "50CrVA") Indicative | [1.8159](/materials/material-no/1.8159 "1.8159") | Quenched and tempered steels | 0.47–0.55 | 27 | | [50CrVA](/materials/gb/50crva "50CrVA") Indicative | [1.2241](/materials/material-no/1.2241 "1.2241") | Tool steels for cold work | 0.47–0.55 | 9 | | [50Mn](/materials/gb/50mn "50Mn") | — | — | 0.47–0.55 | — | | [50Mn2](/materials/gb/50mn2 "50Mn2") | — | — | 0.47–0.55 | — | | [50СrVA](/materials/gb/50srva "50СrVA") Indicative | [1.8159](/materials/material-no/1.8159 "1.8159") | Quenched and tempered steels | 0.47–0.55 | 27 | | [51CrMnV](/materials/gb/51crmnv "51CrMnV") | — | — | 0.47–0.55 | 1 | | [52CrMnMoV](/materials/gb/52crmnmov "52CrMnMoV") | — | — | 0.48–0.56 | 2 | | [52SiCrMnNi](/materials/gb/52sicrmnni "52SiCrMnNi") | — | — | 0.49–0.56 | 1 | | [53Cr21Mn9Ni4N](/materials/gb/53cr21mn9ni4n "53Cr21Mn9Ni4N") | — | — | 0.48–0.58 | — | | [55](/materials/bds/55 "55") Indicative | [1.1203](/materials/material-no/1.1203 "1.1203") | Quenched and tempered steels | 0.52–0.6 | 15 | | [55](/materials/bds/55 "55") Indicative | — | — | — | 3 | | [55](/materials/bds/55 "55") Indicative | [1.0535](/materials/material-no/1.0535 "1.0535") | Quenched and tempered steels | 0.52–0.6 | 21 | | [55CrMn](/materials/gb/55crmn "55CrMn") | — | — | 0.52–0.6 | — | | [55CrMnA](/materials/gb/55crmna "55CrMnA") Indicative | [1.7176](/materials/material-no/1.7176 "1.7176") | Spring steels | 0.52–0.59 | 18 | | [55Mn](/materials/gb/55mn "55Mn") | — | — | 0.52–0.6 | — | | [55Si2Mn](/materials/gb/55si2mn "55Si2Mn") Indicative | [1.5026](/materials/material-no/1.5026 "1.5026") | Spring steels | 0.52–0.6 | 20 | | [55Si2MnB](/materials/gb/55si2mnb "55Si2MnB") | — | — | 0.52–0.6 | — | | [55Si2MnCr](/materials/gb/55si2mncr "55Si2MnCr") | — | — | 0.52–0.6 | 1 | | [55SiCr](/materials/gb/55sicr "55SiCr") | — | — | 0.51–0.59 | — | | [55SiCrA](/materials/gb/55sicra "55SiCrA") | — | — | 0.51–0.59 | — | | [55SiCrV](/materials/gb/55sicrv "55SiCrV") | — | — | 0.51–0.59 | 1 | | [55SiMnMoV](/materials/gb/55simnmov "55SiMnMoV") | — | — | 0.52–0.6 | — | **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/12 "Previous") Page 13 of 27[Next](/materials/gb/page/14 "Next")