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P355QL1 steel plate is a weldable fine-grained steel. P355QL1 steel plate is usually used in professional alloy and pressure equipment due to its excellent plasticity, resistance, cold bending function and welding function. The specification, shape and tolerance of P355QL1 steel plate shall meet the requirements of 2007+A1:2009 in EN10028-1. The steel plate is usually delivered in the condition of quenching and tempering, and the steel plate less than 40mm is delivered by shearing or flame cutting.
Chemical composition and melting analysis of P355QL1 steel plate:
| C | Si | Mn | P | S | Ni | Cr | Mo | Cu | Nb | V | Ti | N | Zr | B |
| ≤0.16 | ≤0.4 | ≤1.5 | ≤0.025 | ≤0.010 | ≤0.5 | ≤0.3 | ≤0.25 | ≤0.3 | ≤0.05 | ≤0.06 | ≤0.03 | ≤0.015 | ≤0.05 | ≤0.005 |
Composition Note: The proportion of grain refining elements should be at least 0.015. Aluminum is also included in these elements, Als≥0.015, Alt≥0.018.
Mechanical properties of P355QL1 steel plate:
| Grade | Delivery state | Thickness (mm) | Yield Strength | Tensile Strength | Elongation | Impact Temperature | Impact Value |
| P355QL1 | Quenching and tempering | 5-50 | ≥355 | 490-630 | ≥22 | -20 | ≥27 |
| Quenching and tempering | >50-100 | ≥355 | 490-630 | ≥22 | -20 | ≥27 | |
| Quenching and tempering | >100-150 | ≥315 | 450-590 | ≥22 | -20 | ≥27 |
