What is the difference between 40Cr 35Cr 45# steel

40Cr steel is a kind of alloy structural steel. 40Cr steel has good comprehensive properties, low-temperature impact toughness and low notch sensitivity after quenching and tempering on the basis of high-quality carbon structural steel No. 40.

35Cr steel is medium carbon alloy quenched and tempered steel. 35Cr steel has higher strength and toughness, better hardenability than 35# steel, and its properties are basically similar to 30Cr steel.

45# steel belongs to high-quality carbon structural steel, commonly known as excellent steel. 45# steel does not specially added contain alloy elements. 45# steel is one of the most widely used high-quality structural steel.