40Cr is the GB standard steel grade in China, and 40Cr steel is one of the most widely used steels in the machinery manufacturing industry. After quenching and tempering, 40Cr seamless steel pipe has good comprehensive mechanical properties, good low temperature impact toughness and low notch sensitivity. The hardenability of 40Cr seamless steel pipe is good, which can be hardened to Ф 28-60mm in water quenching and to Ф 15-40mm in oil quenching.
Besides quenching and tempering, 40Cr seamless steel pipe is also suitable for cyaniding and high frequency quenching. The cutting performance of 40Cr seamless steel tube is better. When the hardness is HB174-229, the relative cutting performance is 60%. 40Cr steel is suitable for making medium-sized plastic mould.
