Chemical composition of S690QL1 steel plate

S690QL1 steel plate has high yield tensile strength and can be used to manufacture some construction machinery or mining machinery.

Chemical composition of S690QL1 steel plate:
S690QL1 steel plate C (carbon) 0.20;
S690QL1 steel plate Si (silicon) 0.80;
S690QL1 steel plate Mn 1.70;
S690QL1 steel plate S (sulfur) 0.010;
S690QL1 steel plate P (P) 0.020;

Mechanical property analysis of S690QL1 steel plate:
tensile strength σb (MPa): ≥1080 (110)
yield strength σs (MPa): ≥835 (85)
elongation δ5 (％): ≥10
Reduce area ψ (％): ≥45
Impact energy Akv (J): ≥ 55
Impact toughness value αkv (J / cm2): ≥69 (7)
Hardness: ≤ 217HB
Sample size: sample blank size is 15mm
20CrMnTi density: 7.8 × 10kg / m3
Elastic modulus: 207GPa
Poisson's ratio: 0.25
Thermal conductivity: 1.26 × 10-5 (1 /℃)
The thickness of each S690QL1 steel plate is different, and the mechanical properties of S690QL1 steel plate are also different. For the above reasons, only steel plates with a thickness of 3 to 50 mm are described.

Smelting method of S690QL1 steel plate:
S690QL1 steel plate is smelted by oxygen converter or electric furnace and needs vacuum smelting.

Precautions for surface quality of S690QL1 steel plate:
The surface of S690QL1 steel plate shall be free of quality defects such as pits, pits, cracks, bubbles and side interlayer. If the above quality defects occur, they can be corrected, but the repair depth cannot exceed half of the thickness tolerance of the steel plate, and the minimum thickness of the steel plate needs to be ensured.