P690QL1 is a high-strength alloy steel plate designed for pressure vessels, boilers, storage tanks, and other pressure equipment. Supplied in the quenched and tempered condition, it provides a minimum yield strength of approximately 690 MPa, combined with high tensile strength and good impact toughness.
The grade is suitable for demanding applications in power generation, petrochemical, oil & gas, chemical processing, and industrial pressure equipment. Its high strength-to-weight ratio and reliable mechanical properties make it well suited for fabricated pressure-containing structures operating under significant pressure and temperature conditions.
Final chemical, mechanical properties, dimensions and tolerances are confirmed against the governing specification and purchase order.
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | Cu | V | Nb | Ti | N |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Max | 0.20 | 0.80 | 1.70 | 0.025 | 0.015 | 1.50 | 2.00 | 0.70 | 0.50 | 0.12 | 0.06 | 0.05 | 0.015 |
| Property | Yield Strength | Tensile Strength | Elongation | Impact Toughness | Hardness |
|---|---|---|---|---|---|
| Min | 690 MPa | 770 MPa | 14% | 27 J @ -40°C | - |
| Max | - | 940 MPa | - | - | - |
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