--- title: "GB steel grades — 1318 designations — Page 9" 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/9 language: en robots: index, follow og_type: website type: material-standard language_alternates: en: https://steelequivalents.com/materials/gb/page/9.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: sha256:0bf83e1f449e05422b4673e58669261ba947ef2f9ebc0662259c6ea8a8cec68a 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/9 > Canonical URL: https://steelequivalents.com/materials/gb/page/9 > 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 9 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. 24 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 | |---|---|---|---|---| | [20MnV](/materials/gb/20mnv "20MnV") Indicative | [1.5217](/materials/material-no/1.5217 "1.5217") | Case hardening steels | 0.16–0.22 | 2 | | [20R](/materials/gb/20r "20R") Indicative | [1.0402](/materials/material-no/1.0402 "1.0402") | Quenched and tempered steels | 0.17–0.24 | 24 | | [20SiMn2MoV](/materials/gb/20simn2mov "20SiMn2MoV") | — | — | 0.17–0.23 | — | | [20SiMnVB](/materials/gb/20simnvb "20SiMnVB") | — | — | 0.17–0.24 | — | | [20Z](/materials/gb/20z "20Z") Indicative | [1.0402](/materials/material-no/1.0402 "1.0402") | Quenched and tempered steels | 0.17–0.24 | 24 | | [21Cr12MoV](/materials/gb/21cr12mov "21Cr12MoV") | — | — | 0.18–0.24 | — | | [21Cr17Ni2](/materials/gb/21cr17ni2 "21Cr17Ni2") | — | — | 0.17–0.25 | — | | [22Cr12NiMoWV](/materials/gb/22cr12nimowv "22Cr12NiMoWV") | — | — | 0.2–0.25 | — | | [22Cr12NiWMoV](/materials/gb/22cr12niwmov "22Cr12NiWMoV") | — | — | 0.2–0.25 | — | | [22Cr20Mn10Ni2Si2N](/materials/gb/22cr20mn10ni2si2n "22Cr20Mn10Ni2Si2N") | — | — | 0.17–0.26 | — | | [22Cr21Ni12N](/materials/gb/22cr21ni12n "22Cr21Ni12N") | — | — | 0.15–0.28 | — | | [22Mng](/materials/gb/22mng "22Mng") | — | — | ≤ 0.3 | — | | [24Cr18Ni8W2](/materials/gb/24cr18ni8w2 "24Cr18Ni8W2") | — | — | 0.21–0.28 | — | | [25](/materials/gost/25 "25") Indicative | [1.1158](/materials/material-no/1.1158 "1.1158") | Quenched and tempered steels | 0.22–0.29 | 12 | | [25](/materials/gost/25 "25") Indicative | [1.0415](/materials/material-no/1.0415 "1.0415") | Quenched and tempered steels | 0.24–0.29 | 6 | | [25](/materials/gost/25 "25") Indicative | [1.1139](/materials/material-no/1.1139 "1.1139") | Quenched and tempered steels | 0.24–0.29 | 6 | | [25](/materials/gost/25 "25") Indicative | [1.1163](/materials/material-no/1.1163 "1.1163") | Quenched and tempered steels | 0.22–0.29 | 6 | | [25](/materials/gost/25 "25") Indicative | [1.9415](/materials/material-no/1.9415 "1.9415") | Quenched and tempered steels | 0.22–0.28 | 6 | | [25](/materials/gost/25 "25") Indicative | [1.9416](/materials/material-no/1.9416 "1.9416") | Others | 0.25–0.31 | 4 | | [25](/materials/gost/25 "25") Indicative | [1.1155](/materials/material-no/1.1155 "1.1155") | Others | 0.2–0.28 | 6 | | [25](/materials/gost/25 "25") Indicative | [1.0406](/materials/material-no/1.0406 "1.0406") | Quenched and tempered steels | 0.22–0.29 | 20 | | [25 25Z ZG230-450](/materials/gb/25-25z-zg230-450 "25 25Z ZG230-450") Indicative | [1.1155](/materials/material-no/1.1155 "1.1155") | Others | 0.2–0.28 | 6 | | [25Cr2Mo1V](/materials/gb/25cr2mo1v "25Cr2Mo1V") | — | — | 0.22–0.29 | — | | [25Cr2Mo1VA](/materials/gb/25cr2mo1va "25Cr2Mo1VA") Indicative | [1.7733](/materials/material-no/1.7733 "1.7733") | Heat-resistant structural steels | 0.2–0.28 | 15 | | [25Cr2MoV](/materials/gb/25cr2mov "25Cr2MoV") | — | — | 0.22–0.29 | — | | [25Cr2MoVA](/materials/gb/25cr2mova "25Cr2MoVA") Indicative | [1.7733](/materials/material-no/1.7733 "1.7733") | Heat-resistant structural steels | 0.2–0.28 | 15 | | [25Cr2Ni4W](/materials/gb/25cr2ni4w "25Cr2Ni4W") | — | — | 0.21–0.28 | — | | [25Cr2Ni4WA](/materials/gb/25cr2ni4wa "25Cr2Ni4WA") | — | — | 0.21–0.28 | — | | [25CrMnSi](/materials/gb/25crmnsi "25CrMnSi") | — | — | 0.22–0.28 | — | | [25CrMo](/materials/gb/25crmo "25CrMo") Indicative | [1.7214](/materials/material-no/1.7214 "1.7214") | Special steels for aviation and aerospace | 0.22–0.29 | 9 | | [25CrMo](/materials/gb/25crmo "25CrMo") Indicative | [1.7218](/materials/material-no/1.7218 "1.7218") | Quenched and tempered steels | 0.22–0.29 | 25 | | [25CrMoA](/materials/gb/25crmoa "25CrMoA") | — | — | 0.22–0.29 | — | | [25CrMoVA](/materials/gb/25crmova "25CrMoVA") Indicative | [1.7733](/materials/material-no/1.7733 "1.7733") | Heat-resistant structural steels | 0.2–0.28 | 15 | | [25Mn](/materials/gb/25mn "25Mn") | — | — | 0.22–0.29 | 1 | | [25MnB](/materials/gb/25mnb "25MnB") | — | — | 0.23–0.28 | 1 | | [25MnG](/materials/gb/25mng "25MnG") Indicative | [1.1155](/materials/material-no/1.1155 "1.1155") | Others | 0.2–0.28 | 6 | | [25MnTiBRE](/materials/gb/25mntibre "25MnTiBRE") | — | — | 0.22–0.28 | — | | [25SiMn2MoV](/materials/gb/25simn2mov "25SiMn2MoV") | — | — | 0.22–0.28 | — | | [25Z](/materials/gb/25z "25Z") Indicative | [1.0406](/materials/material-no/1.0406 "1.0406") | Quenched and tempered steels | 0.22–0.29 | 20 | | [25Z](/materials/gb/25z "25Z") Indicative | [1.1155](/materials/material-no/1.1155 "1.1155") | Others | 0.2–0.28 | 6 | | [26Cr18Mn12Si2N](/materials/gb/26cr18mn12si2n "26Cr18Mn12Si2N") | — | — | 0.22–0.3 | — | | [27SiMn](/materials/gb/27simn "27SiMn") | — | — | 0.24–0.32 | — | | [28MnSiB](/materials/gb/28mnsib "28MnSiB") | — | — | 0.24–0.32 | — | | [28SiMnB](/materials/gb/28simnb "28SiMnB") | — | — | 0.24–0.32 | — | | [2Cr12MoV](/materials/gb/2cr12mov "2Cr12MoV") | — | — | 0.18–0.24 | — | | [2Cr13](/materials/gb/2cr13 "2Cr13") Indicative | [1.4021](/materials/material-no/1.4021 "1.4021") | Stainless steels | 0.16–0.25 | 18 | | [2Cr13](/materials/gb/2cr13 "2Cr13") Indicative | [1.4006](/materials/material-no/1.4006 "1.4006") | Stainless steels | 0.08–0.15 | 26 | | [2Cr17Ni2](/materials/gb/2cr17ni2 "2Cr17Ni2") | — | — | 0.12–0.22 | — | | [2Cr23Ni13](/materials/gb/2cr23ni13 "2Cr23Ni13") Indicative | [1.4828](/materials/material-no/1.4828 "1.4828") | Heat resistant steels | ≤ 0.2 | 20 | | [2Cr23Ni13](/materials/gb/2cr23ni13 "2Cr23Ni13") Indicative | [1.4833](/materials/material-no/1.4833 "1.4833") | Heat resistant steels | ≤ 0.15 | 15 | **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/8 "Previous") Page 9 of 27[Next](/materials/gb/page/10 "Next")