GB/T1591 Q390D steel is a low-alloy high-strength steel. It has good comprehensive mechanical properties, good weldability, cold and hot workability and corrosion resistance. These grade Q390C, D, E grade steel has good low temperature toughness.
GB/T1591 Q390D steel
Q390D mechanical properties allowable tolerance: the size, shape, weight and allowable tolerance of the steel plate should conform to the rules of GB/T709-1988.
Q390D steel smelting analysis welding carbon equivalent CeqWhen the thickness is ≤50mm, Ceq≤0.45%; when the thickness is >50mm, Ceq≤0.47%.
Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15
Q390D steel melting analysis welding crack sensitivity index PcmWhen the thickness is ≤50mm, Ceq≤0.29%; when the thickness is >50mm, Ceq≤0.30%.
Pcm=C+Si/30+Mn/20+ Cu/20+Ni/60+ Cr/20+Mo/15+V/10+5B
Q390D low-alloy high-strength steel is mainly used to make key components with low temperature resistance and high strength, construction machinery, and mining machinery structures.
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