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GB/T1591 Q390D structural steel plates and sheets price ...GB/T1591 Q390 contains five different steel grades as Q390A,Q390B,Q390C,Q390D and Q390E. Structural steel Q390D shall be done impacting test at low temperature minus 20 degree centigrade. Normalised heat treatment suggested to be done for low alloy steel plate Q390D in heavy thickness. GB/T1591 Q39...

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