Gradd a Chyfansoddiad Cemegol (％)
| Gradd | C | Mn | P≤ | S≤ | Si | Cr | Mo |
| 1008 | ≤0.10 | 0.30-0.50 | 0. 040 | 0.050 | - | - | - |
| 1010 | 0.08-0.13 | 0.30-0.60 | 0. 040 | 0.050 | - | - | - |
| 1018 | 0.15-0.20 | 0.60-0.90 | 0. 040 | 0.050 | - | - | - |
| 1020 | 0.18-0.23 | 0.30-0.60 | 0. 040 | 0.050 | - | - | - |
| 1025 | 0.22-0.28 | 0.30-0.60 | 0. 040 | 0.050 | - | - | - |
| 1026 | 0.22-0.28 | 0.60-0.90 | 0. 040 | 0.050 | - | - | - |
| 4130 | 0.28-0.33 | 0.40-0.60 | 0. 040 | 0. 040 | 0.15-0.35 | 0.80-1.10 | 0.15-0.25 |
| 4140 | 0.38-0.43 | 0.75-1.00 | 0. 040 | 0. 040 | 0.15-0.35 | 0.80-1.10 | 0.15-0.35 |
Priodweddau Mecanyddol :
|
|
| MPa |
|
|
| 1020 | CW | ≥414 | ≥483 | ≥5% |
|
| SR | ≥345 | ≥448 | ≥10% |
|
| A | ≥193 | ≥331 | ≥30% |
|
| N | ≥234 | ≥379 | ≥22% |
| 1025 | CW | ≥448 | ≥517 | ≥5% |
|
| SR | ≥379 | ≥483 | ≥8% |
|
| A | ≥207 | ≥365 | ≥25% |
|
| N | ≥248 | ≥379 | ≥22% |
| 4130 | SR | ≥586 | ≥724 | ≥10% |
|
| A | ≥379 | ≥517 | ≥30% |
|
| N | ≥414 | ≥621 | ≥20% |
| 4140 | SR | ≥689 | ≥855 | ≥10% |
|
| A | ≥414 | ≥552 | ≥25% |
|
| N | ≥621 | ≥855 | ≥20% |
