Pure iron protects carbon steel (why is carbon steel quenched and deformed more)

The detailed introduction of alloy steel plate 40Cr 40Cr is the standard steel grade of GB in my country, and 40Cr steel is one of the most widely used steels in the machinery manufacturing industry. After quenching and tempering treatment, it has good comprehensive mechanical properties, good low temperature impact toughness and low notch sensitivity. The steel has good hardenability. It can be hardened to Ф28~60mm when water quenching, and Ф15~40mm when oil quenching. In addition to quenching and tempering, this steel is also suitable for cyaniding and high-frequency quenching. The cutting performance is good, when the hardness is HB174~229, the relative machinability is 60%. This steel is suitable for making medium-sized plastic moulds. Basic information Chinese name: 40Cr Hardness: HRC32-36 Coolant: water, oil Chemical composition: C, Si, Mn, Cr, Ni, P, S, Cu According to the standard GB/T 3077-1999 and GB/T 17107-1997 , steel plate GB/T11251-2009 foreign standards: JIS (Japan): SCr440 ASTM (USA): 5140 ISO: 41Cr4 chemical composition

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