--- title: "GB steel grades — 1318 designations — Page 24" 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/24 language: en robots: index, follow og_type: website type: material-standard language_alternates: en: https://steelequivalents.com/materials/gb/page/24.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:b433d5eb2cf2d32e7b94bdf018c3c161a6c92975f20626be942c41fcb01e9941 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/24 > Canonical URL: https://steelequivalents.com/materials/gb/page/24 > 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 24 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. 8 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 | |---|---|---|---|---| | [QT400-15](/materials/gb/qt400-15 "QT400-15") | [EN-JS1073](/materials/material-no/en-js1073 "EN-JS1073") | Others | — | 17 | | [QT400-18](/materials/gb/qt400-18 "QT400-18") | [EN-JS1030](/materials/material-no/en-js1030 "EN-JS1030") | Others | — | 17 | | [QT400-18](/materials/gb/qt400-18 "QT400-18") | [EN-JS1072](/materials/material-no/en-js1072 "EN-JS1072") | Others | — | 17 | | [QT400-18](/materials/gb/qt400-18 "QT400-18") | [EN-JS1073](/materials/material-no/en-js1073 "EN-JS1073") | Others | — | 17 | | [QT500-7](/materials/gb/qt500-7 "QT500-7") | [EN-JS1082](/materials/material-no/en-js1082 "EN-JS1082") | Others | — | 20 | | [QT500-7](/materials/gb/qt500-7 "QT500-7") | [EN-JS1083](/materials/material-no/en-js1083 "EN-JS1083") | Others | — | 20 | | [QT600-3](/materials/gb/qt600-3 "QT600-3") | [EN-JS1060](/materials/material-no/en-js1060 "EN-JS1060") | Others | — | 20 | | [QT600-3](/materials/gb/qt600-3 "QT600-3") | [EN-JS1092](/materials/material-no/en-js1092 "EN-JS1092") | Others | — | 20 | | [QT600-3](/materials/gb/qt600-3 "QT600-3") | [EN-JS1093](/materials/material-no/en-js1093 "EN-JS1093") | Others | — | 20 | | [QT700-18](/materials/gb/qt700-18 "QT700-18") | [EN-JS1102](/materials/material-no/en-js1102 "EN-JS1102") | Others | — | 21 | | [QT700-18](/materials/gb/qt700-18 "QT700-18") | [EN-JS1103](/materials/material-no/en-js1103 "EN-JS1103") | Others | — | 21 | | [QT700-2](/materials/gb/qt700-2 "QT700-2") | [EN-JS1102](/materials/material-no/en-js1102 "EN-JS1102") | Others | — | 21 | | [QT700-2](/materials/gb/qt700-2 "QT700-2") | [EN-JS1103](/materials/material-no/en-js1103 "EN-JS1103") | Others | — | 21 | | [QT800-2](/materials/gb/qt800-2 "QT800-2") | [EN-JS1080](/materials/material-no/en-js1080 "EN-JS1080") | Others | — | 16 | | [S23043](/materials/gb/s23043 "S23043") | [1.4362](/materials/material-no/1.4362 "1.4362") | Stainless steels | ≤ 0.03 | 6 | | [S47250](/materials/gb/s47250 "S47250") | [1.4938](/materials/material-no/1.4938 "1.4938") | High-temperature steels | 0.08–0.15 | 2 | | [S48140](/materials/gb/s48140 "S48140") | [1.4731](/materials/material-no/1.4731 "1.4731") | Valve steels | 0.35–0.45 | 12 | | [SM45](/materials/gb/sm45 "SM45") | [1.0503](/materials/material-no/1.0503 "1.0503") | Quenched and tempered steels | 0.42–0.5 | 24 | | [SM4Cr5MoSiV](/materials/gb/sm4cr5mosiv "SM4Cr5MoSiV") | [1.2343](/materials/material-no/1.2343 "1.2343") | Tool steels for hot work | 0.33–0.41 | 20 | | [SM4Cr5MoSiV1](/materials/gb/sm4cr5mosiv1 "SM4Cr5MoSiV1") | [1.2344](/materials/material-no/1.2344 "1.2344") | Tool steels for hot work | 0.35–0.42 | 20 | | [SM50](/materials/gb/sm50 "SM50") | [1.0535](/materials/material-no/1.0535 "1.0535") | Quenched and tempered steels | 0.52–0.6 | 21 | | [SM55](/materials/gb/sm55 "SM55") | [1.0535](/materials/material-no/1.0535 "1.0535") | Quenched and tempered steels | 0.52–0.6 | 21 | | [T00123](/materials/gb/t00123 "T00123") | [1.1555](/materials/material-no/1.1555 "1.1555") | Unalloyed tool steels / carbon steels | 1.15–1.25 | 16 | | [T10](/materials/gb/t10 "T10") | [1.1535](/materials/material-no/1.1535 "1.1535") | Unalloyed tool steels / carbon steels | 0.85–0.95 | 14 | | [T10](/materials/gb/t10 "T10") | [1.1645](/materials/material-no/1.1645 "1.1645") | Unalloyed tool steels / carbon steels | 1–1.1 | 18 | | [T10](/materials/gb/t10 "T10") | [1.1545](/materials/material-no/1.1545 "1.1545") | Unalloyed tool steels / carbon steels | 1–1.1 | 19 | | [T10A](/materials/gb/t10a "T10A") | [1.1545](/materials/material-no/1.1545 "1.1545") | Unalloyed tool steels / carbon steels | 1–1.1 | 19 | | [T11](/materials/gb/t11 "T11") | [1.1645](/materials/material-no/1.1645 "1.1645") | Unalloyed tool steels / carbon steels | 1–1.1 | 18 | | [T11](/materials/gb/t11 "T11") | [1.1555](/materials/material-no/1.1555 "1.1555") | Unalloyed tool steels / carbon steels | 1.15–1.25 | 16 | | [T12](/materials/gb/t12 "T12") This grade’s own name | — | — | 1.15–1.24 | 7 | | [T12A](/materials/gb/t12a "T12A") | [1.1555](/materials/material-no/1.1555 "1.1555") | Unalloyed tool steels / carbon steels | 1.15–1.25 | 16 | | [T13](/materials/gb/t13 "T13") This grade’s own name | — | — | 1.25–1.35 | — | | [T21201](/materials/gb/t21201 "T21201") | [1.2379](/materials/material-no/1.2379 "1.2379") | Tool steels for cold work | 1.45–1.6 | 20 | | [T21201](/materials/gb/t21201 "T21201") | [1.2601](/materials/material-no/1.2601 "1.2601") | Tool steels for cold work | 1.55–1.75 | 15 | | [T21201](/materials/gb/t21201 "T21201") | [1.2880](/materials/material-no/1.2880 "1.2880") | Tool steels for cold work | 1.55–1.75 | 8 | | [T21201](/materials/gb/t21201 "T21201") | [1.2880](/materials/material-no/1.2880 "1.2880") | Others | 1.55–1.75 | 8 | | [T21202](/materials/gb/t21202 "T21202") | [1.2379](/materials/material-no/1.2379 "1.2379") | Tool steels for cold work | 1.45–1.6 | 20 | | [T21202](/materials/gb/t21202 "T21202") | [1.2601](/materials/material-no/1.2601 "1.2601") | Tool steels for cold work | 1.55–1.75 | 15 | | [T21202](/materials/gb/t21202 "T21202") | [1.2880](/materials/material-no/1.2880 "1.2880") | Tool steels for cold work | 1.55–1.75 | 8 | | [T21202](/materials/gb/t21202 "T21202") | [1.2880](/materials/material-no/1.2880 "1.2880") | Others | 1.55–1.75 | 8 | | [T7](/materials/gb/t7 "T7") | [1.1520](/materials/material-no/1.1520 "1.1520") | Unalloyed tool steels / carbon steels | 0.65–0.75 | 11 | | [T7](/materials/gb/t7 "T7") | [1.1620](/materials/material-no/1.1620 "1.1620") | Unalloyed tool steels / carbon steels | 0.65–0.74 | 14 | | [T8](/materials/gb/t8 "T8") | [1.1525](/materials/material-no/1.1525 "1.1525") | Unalloyed tool steels / carbon steels | 0.75–0.85 | 20 | | [T8](/materials/gb/t8 "T8") | [1.1625](/materials/material-no/1.1625 "1.1625") | Unalloyed tool steels / carbon steels | 0.75–0.85 | 15 | | [T8MnA](/materials/gb/t8mna "T8MnA") This grade’s own name | — | — | 0.8–0.89 | — | | [T9](/materials/gb/t9 "T9") This grade’s own name | — | — | 0.85–0.94 | 4 | | [T9A](/materials/gb/t9a "T9A") This grade’s own name | — | — | 0.85–0.93 | — | | [U71Mn](/materials/gb/u71mn "U71Mn") This grade’s own name | — | — | 0.6–0.8 | — | | [U75V](/materials/gb/u75v "U75V") This grade’s own name | — | — | 0.71–0.8 | — | | [V01](/materials/gb/v01 "V01") This grade’s own name | — | — | 1–1.1 | — | **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/23 "Previous") Page 24 of 27[Next](/materials/gb/page/25 "Next")