42CrMo1 steel quenching and tempering heat treatment process based on end quenching value regulation and control

The tempering heat treatment process for 42CrMo1 steel with end-quenching value control solves the problems of insufficient hardenability and quenching cracking, achieves efficient and stable tempering effect, improves the depth of hardened layer and quality consistency, and meets the production needs of multi-specification parts.

CN122303539APending Publication Date: 2026-06-30HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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Patent Information

Application Number
CN202610513931.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-17
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

During the quenching and tempering heat treatment of 42CrMo1 steel, there are problems such as uneven microstructure and quenching cracks in the rod part due to insufficient hardenability. In addition, the existing process parameters are not standardized, resulting in large quality fluctuations and making it difficult to achieve efficient and stable quenching and tempering effects.

Method used

By employing a tempering heat treatment process based on end-quench value control, including steps such as end-quench value preset, segmented heating, graded cooling, tempering treatment, and quality verification, a balance between hardenability and quenching crack risk is ensured. Combined with precise control of Ti element and optimization of main alloy composition, a linkage mechanism between end-quench value and heat treatment parameters is established to achieve full-process quality control.

Benefits of technology

It significantly improves the rate of achieving the required depth of the hardened layer and the consistency of the tempering quality, reduces the quenching crack rate and compositional segregation, ensures the stability and traceability of production, and adapts to the process requirements of parts with multiple specifications.

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Abstract

The invention relates to the technical field of heat treatment methods, and discloses a 42CrMo1 steel quenching and tempering heat treatment process based on end quenching value regulation and control. Comprising the steps of 1, preparation before hardening and tempering (relevant end quenching value presetting), 2, quenching treatment (a core end quenching value regulation and control link), 3, tempering treatment (stress relief and structure stabilization), 4, quality verification after hardening and tempering (relevant end quenching value feedback) and 5, finished product identification and filing. According to the present invention, through the precise regulation and control of the Ti element and the synergistic optimization of the main alloy components, the too strong hardenability caused by the too high main alloy is avoided, the grains are refined through the Ti element, the hardenability is improved, the quenching cracking rate is reduced from 16.8% to 3% or less, only 30 steering knuckles of 925 are scrapped due to quenching cracking (the cracking rate is 3.25%), and the stirring frequency is reduced (the stirring frequency is adjusted to 18 HZ), such that the quenching cracking rate is reduced, and the quenching cracking rate is reduced. The cracking rate of subsequent batches is further reduced to about 1%, and the core contradiction between through quenching and cracking is thoroughly solved.
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