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 inother standards |
|---|---|---|---|---|
| QT400-15 | EN-JS1073 | Others | — | 17 |
| QT400-18 | EN-JS1030 | Others | — | 17 |
| QT400-18 | EN-JS1072 | Others | — | 17 |
| QT400-18 | EN-JS1073 | Others | — | 17 |
| QT500-7 | EN-JS1082 | Others | — | 20 |
| QT500-7 | EN-JS1083 | Others | — | 20 |
| QT600-3 | EN-JS1060 | Others | — | 20 |
| QT600-3 | EN-JS1092 | Others | — | 20 |
| QT600-3 | EN-JS1093 | Others | — | 20 |
| QT700-18 | EN-JS1102 | Others | — | 21 |
| QT700-18 | EN-JS1103 | Others | — | 21 |
| QT700-2 | EN-JS1102 | Others | — | 21 |
| QT700-2 | EN-JS1103 | Others | — | 21 |
| QT800-2 | EN-JS1080 | Others | — | 16 |
| S23043 | 1.4362 | Stainless steels | ≤ 0.03 | 6 |
| S47250 | 1.4938 | High-temperature steels | 0.08–0.15 | 2 |
| S48140 | 1.4731 | Valve steels | 0.35–0.45 | 12 |
| SM45 | 1.0503 | Quenched and tempered steels | 0.42–0.5 | 24 |
| SM4Cr5MoSiV | 1.2343 | Tool steels for hot work | 0.33–0.41 | 20 |
| SM4Cr5MoSiV1 | 1.2344 | Tool steels for hot work | 0.35–0.42 | 20 |
| SM50 | 1.0535 | Quenched and tempered steels | 0.52–0.6 | 21 |
| SM55 | 1.0535 | Quenched and tempered steels | 0.52–0.6 | 21 |
| T00123 | 1.1555 | Unalloyed tool steels / carbon steels | 1.15–1.25 | 16 |
| T10 | 1.1535 | Unalloyed tool steels / carbon steels | 0.85–0.95 | 14 |
| T10 | 1.1645 | Unalloyed tool steels / carbon steels | 1–1.1 | 18 |
| T10 | 1.1545 | Unalloyed tool steels / carbon steels | 1–1.1 | 19 |
| T10A | 1.1545 | Unalloyed tool steels / carbon steels | 1–1.1 | 19 |
| T11 | 1.1645 | Unalloyed tool steels / carbon steels | 1–1.1 | 18 |
| T11 | 1.1555 | Unalloyed tool steels / carbon steels | 1.15–1.25 | 16 |
| T12 This grade’s own name | — | — | 1.15–1.24 | 7 |
| T12A | 1.1555 | Unalloyed tool steels / carbon steels | 1.15–1.25 | 16 |
| T13 This grade’s own name | — | — | 1.25–1.35 | — |
| T21201 | 1.2379 | Tool steels for cold work | 1.45–1.6 | 20 |
| T21201 | 1.2601 | Tool steels for cold work | 1.55–1.75 | 15 |
| T21201 | 1.2880 | Tool steels for cold work | 1.55–1.75 | 8 |
| T21201 | 1.2880 | Others | 1.55–1.75 | 8 |
| T21202 | 1.2379 | Tool steels for cold work | 1.45–1.6 | 20 |
| T21202 | 1.2601 | Tool steels for cold work | 1.55–1.75 | 15 |
| T21202 | 1.2880 | Tool steels for cold work | 1.55–1.75 | 8 |
| T21202 | 1.2880 | Others | 1.55–1.75 | 8 |
| T7 | 1.1520 | Unalloyed tool steels / carbon steels | 0.65–0.75 | 11 |
| T7 | 1.1620 | Unalloyed tool steels / carbon steels | 0.65–0.74 | 14 |
| T8 | 1.1525 | Unalloyed tool steels / carbon steels | 0.75–0.85 | 20 |
| T8 | 1.1625 | Unalloyed tool steels / carbon steels | 0.75–0.85 | 15 |
| T8MnA This grade’s own name | — | — | 0.8–0.89 | — |
| T9 This grade’s own name | — | — | 0.85–0.94 | 4 |
| T9A This grade’s own name | — | — | 0.85–0.93 | — |
| U71Mn This grade’s own name | — | — | 0.6–0.8 | — |
| U75V This grade’s own name | — | — | 0.71–0.8 | — |
| 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.