Features and Scope: mechanical properties, good weldability, especially the low-temperature toughness good, but the tendency to embrittlement in the welding of the hot rolled condition. Hot and cold processing performance is better, but cold work when the notch sensitivity. Mainly used for large ships, bridges, pressure vessels, heavy machinery and equipment for rolling stock, power plant equipment and other large welded structure --------- ● mechanical properties: tensile strength σb (MPa): 520 ~ 680 yield strength σs (MPa): ≤ 16: ≥ 420;> 16 ~~ 35: ≥ 400; 35 ~ 50: ≥ 380;> 50 to 100: ≥ 360 elongation δ5 (%): ≥ 19 impact power Akv (J): 0 ° C: ≥ 34 sample size: sample thickness (diameter, side length) ● heat treatment specifications and microstructure: ● Delivery status: to hot-rolled, controlled rolling, normalizing and normalizing delivery tempered status. 

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