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A517 Gr Q offshore oil drilling gear bar steel is an alloy steel plate with high yield strength, also known as chain steel for offshore platform. The A517 series of materials are A517 Gr A, A517 Gr B, A517 Gr E, A517 Gr F, A517 Gr H, A517 Gr S, A517 Gr P, A517 Gr Q.
Chemical composition of A517 Gr Q steel plate (finished product analysis):
| C | Si | Mn | P | S | Ni | Cr | Mo | V |
| 0.14-0.21 | 0.15-0.35 | 0.95-1.3 | ≤0.025 | ≤0.025 | 1.2-1.5 | 1-1.5 | 0.4-0.6 | 0.03-0.08 |
Mechanical properties of A517 Gr Q steel plate:
| Delivery status | Thickness | Mechanical properties | |
| Quenching and tempering | ≤65mm | Rp0.2(MPa) | ≥690 |
| Rm(MPa) | 795-930 | ||
| A50(%) | ≥16 | ||
| Z(%) | ≥45 | ||
| >65-150mm | Rp0.2(MPa) | ≥620 | |
| Rm(MPa) | 725-930 | ||
| A50(%) | ≥14 | ||
| Z(%) | ≥45 | ||
