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Heat treatment of stainless steel parts

Release time:2017-10-27 10:41:23  Viewed:

Heat treatment of stainless steel parts

According to the different appearance and shape of the stainless steel parts, the parts can be divided into three categories: shaft, plate and special-shaped parts.


Parts heat treatment


In the heat treatment process of stainless steel parts processing, it is necessary to control the internal stress while making the parts obtain the required hardness, so as to guarantee the dimensional stability of parts processing. Different materials have different treatment methods. With the development of mold industry in recent years, the types of materials used have increased. Apart from Cr12, 40Cr, Cr12MoV and cemented carbide, for some convex and concave dies with high working strength and severe stress, new material powder alloy steel, such as V10 and ASP23, can be selected. Such materials have high thermal stability and good microstructure.


For the parts with Cr12MoV as the material, the workpiece is hardened after rough processing. There is a large residual stress of the workpiece after quenching, which will easily lead to the cracking in finishing or work. After quenching, the parts should be tempered while hot to eliminate the quenching stress.


Quenching temperature control in 900-1020 ℃, then cool to 200-220 ℃ from air cooling, then quickly returns to 220 ℃ tempering, this method is called a hardening process, can obtain high strength and wear resistance, to wear as the main failure forms of mould effect is better. In production, some workpieces with more corners and complex shapes are encountered. Tempering is not enough to eliminate the quenching stress. Before finishing, stress annealing or repeated aging treatment are needed to fully release the stress.


For powder alloy steel parts, because its can bear high temperature tempering, quenching can be adopted when the secondary hardening process, the 1050-1080 ℃ quenching, with a 490-520 ℃ high temperature tempering and for many times, can obtain higher impact toughness and stability, to collapse as the main failure forms of blade mould. The cost of powder alloy steel is high, but its performance is good.


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