Method for martensite and bainite isothermal quenching of GCr15SiMn steel bearing ring
A technique of isothermal quenching for bearing rings, applied in the field of warm quenching, which can solve the problems of ring cracking, large grinding allowance, and harsh working conditions, reduce the tendency of quenching cracks and grinding cracks, and improve the yield of grinding products , Improve the effect of heat treatment quality
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[0016] Example
[0017] The embodiment of the present invention provides a GCr15SiMn steel bearing ring marbeite austempering method. The GCr15SiMn steel bearing ring is heated to 820-840°C, then placed in a 220°C nitrate solution at an intermediate temperature, and then taken out. .
[0018] The nitrate solution is KNO 3 Solution and NaNO 3 A mixture of solutions.
[0019] The KNO 3 Solution and NaNO 3 The mass fractions of the solutions are: KNO 3 Solution 50%, NaNO 3 Solution 50%.
[0020] The KNO 3 The volume ratio of the solution and the NaNO3 solution is 1:1.
[0021] The isothermal time in the nitrate solution is 5-8h.
[0022] In summary, the present invention replaces GCr15 steel with GCr15SiMn steel, which has strong hardenability, and the effective wall thickness of the bearing ring can be expanded to about 40mm, thereby expanding the use range of GCr15SiMn steel manufacturing bearing ring and reducing the manufacturing cost of the bearing. . Generally, GCr15SiMn steel has ...
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