S690QL is a high-strength low-alloy structural steel supplied in the quenched and tempered condition according to EN 10025-6. With a minimum yield strength of approximately 690 MPa for thinner plates, it provides an excellent combination of strength, toughness, and durability while allowing lighter structures to be designed without compromising load-bearing performance.
The grade is widely used for heavy-duty structures, cranes, bridges, construction machinery, pressure and lifting equipment, mining machinery, and transportation applications. S690QL also provides good weldability when appropriate welding procedures are followed and maintains reliable mechanical properties in demanding structural environments.
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 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 | - | - | 300 HB |
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