Alloy spring steel ultra-fine martensite heat treatment quenching strengthening process

A spring steel, ultra-fine technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems that the effect is not very significant, the improvement of performance indicators is limited, etc.

Inactive Publication Date: 2008-03-05
CHANGAN AUTOMOBILE (GRP) CO LTD
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  • Abstract
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Problems solved by technology

Spring material 65Si 2 MnWA, 60Si 2 MnA, 65Si 2 CrVA, 70Si 3 MnA springs after conventional heat treatment and quenching process and tempering, its tensile strength, yield ratio, elasticity, fatigue strength, toughness and plasticity are generally fixed within a range, through the above two conventional austenite crystals The improvement of the above performance indicators by the grain refinement process method is limited, and the effect is not very significant

Method used

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  • Alloy spring steel ultra-fine martensite heat treatment quenching strengthening process
  • Alloy spring steel ultra-fine martensite heat treatment quenching strengthening process
  • Alloy spring steel ultra-fine martensite heat treatment quenching strengthening process

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Embodiment Construction

[0017] Below in conjunction with accompanying drawing and example the patent of the present invention is further described.

[0018] Take the processing of spring parts shown in Figure 3 as an example, spring material: 65Si 2 MnWA, technical requirements: cylindrical compression spring, direction of rotation: right-handed; effective number of turns: 36; total number of turns: 37.5; unfolded length: 2288 mm; heat treatment hardness: 51HRC-56HRC; surface treatment: dipping X98 after phosphating -1 two layers of glue (ZBG51071-1987); inspection: compression test for 24 hours H2 = 172mm, 790N≤P2≤890N; acceptance conditions according to II-WJ532-1993.

[0019] Combined with the process diagram 2, put the coiled spring into the core column and put it vertically into the salt bath furnace. The temperature of the salt bath furnace is controlled at 880°C, and the spring holding time is 10 minutes. In the salt tank, the temperature of the nitrate-salt tank is controlled at 280°C, and t...

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Abstract

The present invention is heat treatment process of quenching to enhance alloy spring steel of super strong fined martensite. The heat treatment process includes the steps of treating spring material at 880 deg.c to form for austenizing, quenching at 280+/-10 deg.c in an isothermal nitrate furnace for 60-90 min, cooling in water, tempering at 280-300 deg.c in a tempering nitrate furnace or a well-type electric furnace for 90-120 min, and final water cooling. The technological process can raise the yield strength, reduction of area, impact toughness and elasticity of spring material.

Description

technical field [0001] The material involved in the present invention is mainly 65Si 2 MnWA, 60Si 2 MnA, 65Si 2 CrVA, 70Si 3 The heat treatment process strengthening method of MnA spring steel can significantly improve the tensile strength and yield ratio of the spring material on springs of the same material and the same shape and specification, and improve the elasticity of the spring. Background technique [0002] Spring material 65Si 2 MnWA, 60Si 2 MnA, 65Si 2 CrVA, 70Si 3 The traditional heat treatment strengthening process method of MnA steel is: first heat the spring material through a heat treatment furnace (such as box-type electric furnace, salt bath furnace, vacuum furnace, etc.) Tempering at 400°C±20°C, heat preservation for 90-120 minutes, water cooling (tempering equipment can be well type tempering furnace, nitrate tempering furnace, vacuum tempering furnace, etc.). Due to spring material 65Si 2 When MnWA is austenitized at 880°C, with the homogenizat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/02C21D1/18
Inventor 付在再
Owner CHANGAN AUTOMOBILE (GRP) CO LTD
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