EN 10025-6 — Quenched and tempered high-strength structural steel
Grades
S460Q, S460QL, S460QL1, S500Q, S500QL, S550Q, S550QL, S620Q, S620QL, S690Q, S690QL, S690QL1, S890Q, S890QL, S960Q, S960QL
Chemical composition and mechanical properties
| Grade | Chemical composition | Mechanical properties |
|---|---|---|
| S460Q | C≤0.18, Mn≤1.70, P≤0.020, S≤0.010, Si≤0.50, N≤0.015, B≤0.005, Cr≤1.50, Cu≤0.50, Mo≤0.50, Nb≤0.05, Ni≤2.00, Ti≤0.05, V≤0.10 | Rm 570-720 MPa, Rp0.2 ≥460 MPa, A≥17%, 0℃ Akv≥30J |
| S460QL | Same as S460Q, P≤0.020, S≤0.010 | Rm 570-720 MPa, Rp0.2 ≥460 MPa, A≥17%, -40℃ Akv≥30J |
| S460QL1 | Same as S460Q, P≤0.020, S≤0.010 | Rm 570-720 MPa, Rp0.2 ≥460 MPa, A≥17%, -60℃ Akv≥30J |
Application scope
EN 10025-6 specifies high-strength structural hot-rolled steel plates delivered in a quenched and tempered condition, covering different low-temperature impact grades such as S460Q, S500Q, S690Q to S960Q and QL, QL1, etc. It has a wide strength range, good hardenability and good weldability, and is suitable for welding load-bearing and heavy-duty structural components.
Typical applications
Widely used in heavy-duty engineering machinery, crane booms and mining equipment, as well as in heavy-duty structures such as pressure vessels, offshore platforms and bridges; with its high strength, it significantly reduces the structural weight and improves load-bearing and impact resistance, making it suitable for heavy structures and load-bearing components that are welded, pursue lightweight and high load-bearing capacity, and repeatedly withstand dynamic loads and impacts.
