S690QL is a high-strength alloy structural steel plate that belongs to the European standard (EN 10025-6) special alloy structural steel with excellent mechanical properties and a wide range of applications. The chemical composition of S690QL is carefully formulated to meet its high strength and toughness requirements.

The main element contents (maximum %) include:
C: ≤0.20%; Si: ≤0.80%; Mn: ≤1.70%; P: ≤0.020%; S: ≤0.010%; Cr: ≤1.50%; Ni: ≤2.00%; Mo: ≤0.70%; Cu: ≤0.50%; V: ≤0.12%; Nb≤0.06%,
The content and ratio of these elements are crucial to ensuring the overall performance of the steel plate.

Mechanical Properties of S690QL:
Yield Strength: σ0.2 ≥ 690 MPa (Some sources indicate a yield strength range of 690-890 MPa, but the lower limit of EN 10025-6 is generally followed).
Tensile Strength: σb 770-940 MPa
Elongation: ≥ 14%
Low-Temperature Impact Resistance: Longitudinal V-shaped impact energy ≥ 30J at -40°C
These mechanical properties enable S690QL steel to withstand high-intensity and heavy-load environments while maintaining excellent toughness and impact resistance.

S690QL steel plate offers the following performance advantages:
Ultra-high strength: Yield strength ≥ 690 MPa, tensile strength up to 940 MPa, enabling lightweight structures.
Excellent low-temperature toughness: -40℃ impact energy ≥30J, suitable for extremely cold areas or low-temperature impact conditions.
Good welding performance: low-temperature impact energy of weld and fusion line> 60J, supporting arc welding, submerged arc welding and other processes. Strong fatigue resistance: low crack growth rate under dynamic load, extending equipment life.
Corrosion resistance: Surface treatment (such as hot-dip galvanizing and spraying anti-corrosion paint) can further improve corrosion resistance.

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