GB steel grades — 1318 designations — Page 21
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. 20 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 |
|---|---|---|---|---|
| Q235B | 1.0036 | Unalloyed structural steels | ≤ 0.17 | 19 |
| Q235B | 1.0028 | Unalloyed structural steels | ≤ 0.15 | 18 |
| Q235B-F | 1.0028 | Unalloyed structural steels | ≤ 0.15 | 18 |
| Q235B-Z | 1.0038 | Unalloyed structural steels | ≤ 0.17 | 26 |
| Q235B-Z | 1.0036 | Unalloyed structural steels | ≤ 0.17 | 20 |
| Q235B-Z | 1.0036 | Unalloyed structural steels | ≤ 0.17 | 19 |
| Q235B-Z | 1.0028 | Unalloyed structural steels | ≤ 0.15 | 18 |
| Q235C | 1.0114 | Unalloyed structural steels | ≤ 0.17 | 21 |
| Q235C | 1.0038 | Unalloyed structural steels | ≤ 0.17 | 26 |
| Q235D | 1.0117 | Unalloyed structural steels | ≤ 0.17 | 5 |
| Q235NH This grade’s own name | — | — | ≤ 0.13 | — |
| Q235NHB This grade’s own name | — | — | ≤ 0.13 | — |
| Q245R This grade’s own name | — | — | ≤ 0.2 | — |
| Q255 | 1.0144 | Unalloyed structural steels | ≤ 0.18 | 22 |
| Q255 | 1.0044 | Unalloyed structural steels | ≤ 0.21 | 26 |
| Q255A | 1.0044 | Unalloyed structural steels | ≤ 0.21 | 26 |
| Q255B This grade’s own name | — | — | 0.18–0.28 | — |
| Q265GNH This grade’s own name | — | — | ≤ 0.12 | — |
| Q275 | 1.0143 | Unalloyed structural steels | ≤ 0.18 | 16 |
| Q275 | 1.0050 | Unalloyed structural steels | — | 23 |
| Q275 | 1.0050 | Unalloyed structural steels | — | 23 |
| Q275 | 1.0145 | Unalloyed structural steels | ≤ 0.18 | 8 |
| Q275 | 1.0533 | Others | — | 3 |
| Q275A This grade’s own name | — | — | ≤ 0.24 | — |
| Q275AF This grade’s own name | — | — | ≤ 0.24 | — |
| Q275B This grade’s own name | — | — | ≤ 0.21 | — |
| Q275C This grade’s own name | — | — | ≤ 0.2 | — |
| Q275D This grade’s own name | — | — | ≤ 0.2 | — |
| Q275Z | 1.0044 | Unalloyed structural steels | ≤ 0.21 | 26 |
| Q275Z | 1.0050 | Unalloyed structural steels | — | 23 |
| Q275Z | 1.0050 | Unalloyed structural steels | — | 23 |
| Q295A This grade’s own name | — | — | ≤ 0.16 | — |
| Q295B This grade’s own name | — | — | ≤ 0.16 | — |
| Q295GNH This grade’s own name | — | — | ≤ 0.12 | — |
| Q295GNHL This grade’s own name | — | — | ≤ 0.12 | — |
| Q295NH This grade’s own name | — | — | ≤ 0.15 | — |
| Q310GNH This grade’s own name | — | — | ≤ 0.12 | — |
| Q345A This grade’s own name | — | — | ≤ 0.2 | — |
| Q345B | 1.0045 | Unalloyed structural steels | ≤ 0.24 | 17 |
| Q345C | 1.0060 | Unalloyed structural steels | — | 21 |
| Q345C | 1.0060 | Unalloyed structural steels | — | 21 |
| Q345C | 1.0045 | Unalloyed structural steels | ≤ 0.24 | 17 |
| Q345C | 1.0050 | Unalloyed structural steels | — | 23 |
| Q345C | 1.0050 | Unalloyed structural steels | — | 23 |
| Q345D | 1.0545 | Fine-grain structural steels | ≤ 0.2 | 9 |
| Q345D | 1.0577 | Unalloyed structural steels | ≤ 0.2 | 11 |
| Q345E | 1.0546 | Fine-grain structural steels | ≤ 0.18 | 8 |
| Q345GNH This grade’s own name | — | — | ≤ 0.12 | — |
| Q345GNHL This grade’s own name | — | — | ≤ 0.12 | — |
| Q345R This grade’s own name | — | — | ≤ 0.2 | — |
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.