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5140 40cr gr8 8 q amp t steel round bar

Description: 40Cr Steel Equivalent, Mechanical Properties & Chemical 40Cr steel is a kind of Chinese GB standard alloy steel for engineering and machinery purpose, and one of the most widely used steel grades. For 40Cr material hardness, specifications and equivalent, please see the table below. After quenching and tempering treatment, 40Cr steel has good comprehensive mechanical properties, low temperature Chinese GB Standard 183; En Standards 183; 4Cr13

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