50 steel ultrafine martensite isothermal quenching thermal treatment hardening process

A technology of austempering and ultra-refining, applied in the field of 50 steel ultra-refinement martensitic austempering heat treatment hardening process, can solve the problems of limited improvement of performance indicators and not very significant effect, and achieve the effect of improving tensile strength

Inactive Publication Date: 2016-08-24
CHANGAN AUTOMOBILE (GRP) CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

Material 50 steel sheet 50 steel after conventional heat treatment quenching process and tempering, its tensile strength, yield strength ratio, elasticity, fatigue strength, toughness and plasticity are generally fixed within a range, through the above two conventional The austenite grain refinement process has limited improvement on the above performance indicators, and the effect is not very significant

Method used

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  • 50 steel ultrafine martensite isothermal quenching thermal treatment hardening process
  • 50 steel ultrafine martensite isothermal quenching thermal treatment hardening process
  • 50 steel ultrafine martensite isothermal quenching thermal treatment hardening process

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Experimental program
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Embodiment

[0028] Figure 1A It is a diagram of the diffusion mechanism of micro-cracks in the austenite grains of 50 steel after ordinary and traditional heat treatment 50 steel is quenched and tempered;

[0029] Figure 1B It is the micro-crack diffusion mechanism diagram of the austenite grain inside the 50 steel after the ultrafine martensitic isothermal heat treatment adopted in this patent;

[0030] heat treatment image 3 The 50 steel spring piece shown as an example, material: 50 steel, technical requirements, heat treatment hardness is 44HRC-49HRC; surface treatment: dip black electrophoretic paint after phosphating; inspection: transverse tensile force ≥ 11KN.

[0031] Combination process figure 2 , After binding the stamped 50 steel spring pieces with iron wires, put them vertically into the salt bath furnace. The pieces are quenched into the isothermal nitrate tank, the temperature of the nitrate tank is controlled at 240 ° C, the 50 steel spring pieces are kept in the ni...

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Abstract

The invention relates to a 50 steel ultrafine martensite isothermal quenching thermal treatment hardening process which includes the steps of: increasing the temperature of a punch-molded material, 50 steel part, through a thermal treatment heating device to 850 DEG C, and maintaining the temperature according to the thickness of the 50 steel strip; quenching the 50 steel part in a nitrate bath trough, and cooling the 50 steel part in water; tempering the 50 steel part and then water-cooling or air-cooling the tempered 50 steel part to complete the whole thermal treatment process. The 50 steel ultrafine martensite isothermal quenching thermal treatment hardening process can increase tensile strength, yield ratio, elasticity, fatigue strength, toughness and plasticity of the 50 steel under the same hardness level through different thermal treatment processes.

Description

technical field [0001] The invention relates to a strengthening and hardening method of heat treatment process of 50 steel, which is mainly made of 50 steel. On the sheet 50 steel of the same material and shape, the invention can improve the tensile strength of the material, and improve the elasticity and tensile strength of the sheet 50 steel. force. Background technique [0002] The traditional heat treatment strengthening process of medium carbon steel 50 steel is: first heat the material to 840°C±10°C through a special heating furnace for heat treatment (such as box-type electric furnace, salt bath furnace, vacuum furnace, etc.) Cold, then temper 50 steel at 340°C ± 20°C, hold for 90 minutes, and cool in the air (tempering equipment can be well-type resistance tempering furnace, nitrate tempering furnace, vacuum tempering furnace, etc.). Since the 50 steel material is austenitized at 850 °C, with the homogenization of the alloy elements in the austenite grains, the aust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/22
Inventor 向宏付在再
Owner CHANGAN AUTOMOBILE (GRP) CO LTD
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