The chemical composition of Q245R, a Chinese low-alloy steel grade used for pressure vessels (per GB 713 standard), is as follows:
Carbon (C): ≤0.20%
Manganese (Mn): 0.40-0.60%
Silicon (Si): ≤0.35%
Phosphorus (P): ≤0.025%
Sulfur (S): ≤0.015%
Aluminum (Al) (total): ≥0.020% (for deoxidation)
Carbon Equivalent (Ceq): Typically ~0.37% (calculated as C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15, though Cr, Mo, Ni, Cu are minimal or not specified)
Notes
Q245R’s low carbon and manganese content ensure good weldability and moderate strength, suitable for pressure vessels and boilers.
The composition may vary slightly depending on plate thickness or manufacturer, but must comply with GB 713 standards.
Always verify with the specific material certificate for precise composition in practical applications.
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