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High strength GB/T1591 Q420D Carbon and low ally steel round bar, Q420D steel bar. GB/T1591 Q420D Carbon and low ally steel round bar shall be done impacting test at low temperature minus 20 degree centigrade.Normalised heat treatment suggested to be done for low alloy steel plate Q420D in heavy thickness. Get Price. 2018-1-16

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Q345B low alloy high strength steel plates have 2 standards at present: GB/T1591 and GB/T3274. GB/T3274 is new version based on GB/T1591, but a lot of mills still conduct GB/T1591 at present.

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