material 40cr

40Cr is the GB standard steel number in China, and 40Cr steel is one of the most widely used steel in mechanical manufacturing industry.It has good comprehensive mechanical properties, good low temperature impact toughness and low notch sensitivity.Good steel hardenability, when water quench hardening to Ф 28 ~ 60 mm, when oil quenching hardening to Ф 15 ~ 40 mm.The steel is also suitable for cyanidation and high frequency quenching.When the hardness is 174 ~ 229HB, the relative machinability is 60%.The steel is suitable for making medium – sized plastic molds.

Medium carbon tempered steel, cold heading die steel.The steel is of moderate price, easy to process and can obtain certain toughness, plasticity and abrasion resistance after proper heat treatment.Normalizing can improve the cutting performance of the blank by promoting the microstructure refinement and approaching the equilibrium state.Tempered at 550~570℃, the steel has the best comprehensive mechanical properties.The hardenability of the steel is higher than 45 steel, suitable for high frequency quenching, flame quenching and other surface hardening treatment.

Shaft parts are one of the typical parts often encountered in machines.It is mainly used to support transmission components, transfer torque and load.Shaft parts are rotating body parts, the length of which is greater than the diameter, generally composed of concentric shaft cylindrical surface, conical surface, internal hole and thread and the corresponding end surface.According to the different shape of the structure, shaft parts can be divided into optical shaft, step shaft, hollow shaft and crankshaft.

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40Cr is a common material of shaft parts. It is cheap and can get better cutting performance after quenching and tempering (or normalizing), and can get higher comprehensive mechanical properties such as strength and toughness. After quenching, the surface hardness can reach 45 ~ 52HRC.

40Cr is widely used in mechanical manufacturing. This kind of steel has good mechanical properties.This is a medium carbon alloy steel with good quenching performance, 40Cr can be hardened to HRC45~52.Therefore, if the surface hardness needs to be improved and the superior mechanical properties of 40Cr are expected to be brought into play, the surface high-frequency quenching treatment is often carried out after the conditioning of 40Cr, with the hardness up to 55-58hrc, so as to obtain the required high surface hardness and maintain the good toughness of the heart.