--- title: "GB steel grades — 1318 designations — Page 8" 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/8 language: en robots: index, follow og_type: website type: material-standard language_alternates: en: https://steelequivalents.com/materials/gb/page/8.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: sha256:8477ec3878c369a35ed484509bf7bd10e91cec04357ed21fc81a8e75e9078822 generated: 2026-09-25 --- > **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/8 > Canonical URL: https://steelequivalents.com/materials/gb/page/8 > 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 8 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 indicative cross-reference, not an asserted identity — the grades are close, not interchangeable. 24 of 50 rows differ and carry a “This grade’s own name” mark. ## Also known as 1318 designations | Grade | Material no. | Category | C% by weight | Also in other standards | |---|---|---|---|---| | [1Cr25Ni20Si2](/materials/gb/1cr25ni20si2 "1Cr25Ni20Si2") | [1.4845](/materials/material-no/1.4845 "1.4845") | Heat resistant steels | ≤ 0.1 | 21 | | [1Cr25Ti](/materials/gb/1cr25ti "1Cr25Ti") | [1.4746](/materials/material-no/1.4746 "1.4746") | Others | ≤ 0.12 | 8 | | [1Cr5Mo](/materials/gb/1cr5mo "1Cr5Mo") This grade’s own name | — | — | ≤ 0.15 | — | | [1Cr6Si2Mo](/materials/gb/1cr6si2mo "1Cr6Si2Mo") This grade’s own name | — | — | ≤ 0.15 | — | | [1Ni3MnCuMoAl](/materials/gb/1ni3mncumoal "1Ni3MnCuMoAl") This grade’s own name | — | — | 0.1–0.2 | 1 | | [1Y1Cr13](/materials/gb/1y1cr13 "1Y1Cr13") | [1.4005](/materials/material-no/1.4005 "1.4005") | Stainless steels | 0.08–0.15 | 14 | | [20](/materials/bds/20 "20") | [1.0254](/materials/material-no/1.0254 "1.0254") | Unalloyed structural steels | ≤ 0.16 | 6 | | [20](/materials/bds/20 "20") | [1.0345](/materials/material-no/1.0345 "1.0345") | Heat-resistant structural steels | ≤ 0.16 | 18 | | [20](/materials/bds/20 "20") | [1.0562](/materials/material-no/1.0562 "1.0562") | Fine-grain structural steels | ≤ 0.18 | 18 | | [20](/materials/bds/20 "20") | [1.1151](/materials/material-no/1.1151 "1.1151") | Quenched and tempered steels | 0.17–0.24 | 15 | | [20](/materials/bds/20 "20") | [1.0402](/materials/material-no/1.0402 "1.0402") | Quenched and tempered steels | 0.17–0.24 | 24 | | [20Cr](/materials/gb/20cr "20Cr") | [1.7027](/materials/material-no/1.7027 "1.7027") | Case hardening steels | 0.17–0.23 | 12 | | [20Cr13](/materials/gb/20cr13 "20Cr13") This grade’s own name | — | — | 0.16–0.25 | — | | [20Cr13Mn9Ni4](/materials/gb/20cr13mn9ni4 "20Cr13Mn9Ni4") This grade’s own name | — | — | 0.15–0.25 | — | | [20Cr15Mn15Ni2N](/materials/gb/20cr15mn15ni2n "20Cr15Mn15Ni2N") This grade’s own name | — | — | 0.15–0.25 | — | | [20Cr25Ni20](/materials/gb/20cr25ni20 "20Cr25Ni20") This grade’s own name | — | — | ≤ 0.25 | — | | [20Cr25Ni20Si2](/materials/gb/20cr25ni20si2 "20Cr25Ni20Si2") This grade’s own name | — | — | ≤ 0.25 | — | | [20Cr2Ni4](/materials/gb/20cr2ni4 "20Cr2Ni4") This grade’s own name | — | — | 0.17–0.23 | — | | [20Cr2Ni4A](/materials/gb/20cr2ni4a "20Cr2Ni4A") This grade’s own name | — | — | 0.17–0.23 | — | | [20Cr3MoWV](/materials/gb/20cr3mowv "20Cr3MoWV") This grade’s own name | — | — | 0.17–0.24 | — | | [20Cr3MoWVA](/materials/gb/20cr3mowva "20Cr3MoWVA") This grade’s own name | — | — | 0.17–0.24 | — | | [20CrH](/materials/gb/20crh "20CrH") | [1.3523](/materials/material-no/1.3523 "1.3523") | Case hardening steels | 0.17–0.22 | 8 | | [20CrH](/materials/gb/20crh "20CrH") | [1.7147](/materials/material-no/1.7147 "1.7147") | Case hardening steels | 0.17–0.22 | 15 | | [20CrMn](/materials/gb/20crmn "20CrMn") | [1.7147](/materials/material-no/1.7147 "1.7147") | Case hardening steels | 0.17–0.22 | 15 | | [20CrMn](/materials/gb/20crmn "20CrMn") | [1.7131](/materials/material-no/1.7131 "1.7131") | Case hardening steels | 0.14–0.19 | 24 | | [20CrMn](/materials/gb/20crmn "20CrMn") | [1.7176](/materials/material-no/1.7176 "1.7176") | Spring steels | 0.52–0.59 | 18 | | [20CrMnMo](/materials/gb/20crmnmo "20CrMnMo") This grade’s own name | — | — | 0.17–0.23 | — | | [20CrMnMoH](/materials/gb/20crmnmoh "20CrMnMoH") This grade’s own name | — | — | 0.17–0.23 | — | | [20CrMnSi](/materials/gb/20crmnsi "20CrMnSi") This grade’s own name | — | — | 0.17–0.23 | — | | [20CrMnTi](/materials/gb/20crmnti "20CrMnTi") | [1.7131](/materials/material-no/1.7131 "1.7131") | Case hardening steels | 0.14–0.19 | 24 | | [20CrMnTi](/materials/gb/20crmnti "20CrMnTi") | [1.7147](/materials/material-no/1.7147 "1.7147") | Case hardening steels | 0.17–0.22 | 15 | | [20CrMo](/materials/gb/20crmo "20CrMo") This grade’s own name | — | — | 0.17–0.24 | 1 | | [20CrMoA](/materials/gb/20crmoa "20CrMoA") This grade’s own name | — | — | 0.17–0.24 | — | | [20CrNi](/materials/gb/20crni "20CrNi") This grade’s own name | — | — | 0.17–0.23 | — | | [20CrNi3](/materials/gb/20crni3 "20CrNi3") | [1.5919](/materials/material-no/1.5919 "1.5919") | Case hardening steels | 0.12–0.18 | 11 | | [20CrNi3A](/materials/gb/20crni3a "20CrNi3A") | [1.5752](/materials/material-no/1.5752 "1.5752") | Case hardening steels | 0.14–0.2 | 15 | | [20CrNi3A](/materials/gb/20crni3a "20CrNi3A") | [1.5919](/materials/material-no/1.5919 "1.5919") | Case hardening steels | 0.12–0.18 | 11 | | [20CrNiMo](/materials/gb/20crnimo "20CrNiMo") | [1.6523](/materials/material-no/1.6523 "1.6523") | Case hardening steels | 0.17–0.23 | 18 | | [20CrNiMoA](/materials/gb/20crnimoa "20CrNiMoA") This grade’s own name | — | — | 0.17–0.23 | — | | [20CrNiMoH](/materials/gb/20crnimoh "20CrNiMoH") | [1.6523](/materials/material-no/1.6523 "1.6523") | Case hardening steels | 0.17–0.23 | 18 | | [20CrV](/materials/gb/20crv "20CrV") | — | — | — | 2 | | [20G](/materials/gb/20g "20G") | [1.0402](/materials/material-no/1.0402 "1.0402") | Quenched and tempered steels | 0.17–0.24 | 24 | | [20G](/materials/gb/20g "20G") This grade’s own name | [1.1133](/materials/material-no/1.1133 "1.1133") | Quenched and tempered steels | 0.17–0.23 | 20 | | [20Mn](/materials/gb/20mn "20Mn") This grade’s own name | — | — | 0.17–0.23 | 3 | | [20Mn2](/materials/gb/20mn2 "20Mn2") | [1.1133](/materials/material-no/1.1133 "1.1133") | Quenched and tempered steels | 0.17–0.23 | 20 | | [20Mn2B](/materials/gb/20mn2b "20Mn2B") This grade’s own name | — | — | 0.17–0.24 | — | | [20MnCr](/materials/gb/20mncr "20MnCr") | [1.7147](/materials/material-no/1.7147 "1.7147") | Case hardening steels | 0.17–0.22 | 15 | | [20MnG](/materials/gb/20mng "20MnG") | [1.1133](/materials/material-no/1.1133 "1.1133") | Quenched and tempered steels | 0.17–0.23 | 20 | | [20MnMoB](/materials/gb/20mnmob "20MnMoB") This grade’s own name | — | — | — | 1 | | [20MnTiB](/materials/gb/20mntib "20MnTiB") This grade’s own name | — | — | 0.17–0.24 | — | **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/7 "Previous") Page 8 of 27[Next](/materials/gb/page/9 "Next")