How to improve the life of seamless steel pipe
Under the premise of seamless steel pipe materials have been identified, how to improve its service life to meet the technical requirements of the above, the heat treatment process problems to be solved.
And generally improve the seamless steel pipe to meet the performance requirements, the process for carburizing heat treatment, surface hardening, nitriding, etc., are described below.
seamless steel pipe carburizing
Seamless steel material used for the carburizing carburizing steel, carburizing layer is 1.4 ~ 1.8mm, surface hardness after quenching at 58 ~ 63HRC, cryogenic processing ? Finally, tempering process and failure to ensure internal residual austenite transformed to martensite, having high surface hardness and hardened layer must meet the high wear resistance and fatigue strength requirements, improve service life. Such as seamless steel pipe that is carried out using this process.
seamless steel pipe surface hardening
Surface hardening using mostly 45 seamless steel pipe, 400,42MnVB, 42CrMo, 65Mn, GCrl5,9Mn2V etc., after normalizing or quenching and tempering treatment, to obtain a certain hardness and organization, then subjected to a total or partial (surface layer) quenching. Shaft diameter carbon steel hardness controlled at 52 ~ 61HRC, dismantling other parts of hardness 48 ~ 52HRC; shaft diameter seamless steel pipe for the surface hardening, hardness 59HRC or more, other demolition portion hardness 50 ~ 55HRC. Such as small seamless steel pipe and grinding spindles, the use of surface hardening to improve its wear resistance.
seamless steel pipe nitriding
Nitriding here refers to the hard nitrided. 38CrMoAlA seamless steel pipe material, the material after quenching and tempering treatment, the hardness of the matrix of the first control in the 250 ~ 280HBS, followed by nitriding treatment, depending on the technical requirements, you can choose a nitride, secondary nitriding, three times nitriding process, the surface hardness of 900HV or more, nitriding depth in 0.4mm or more,
