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Heat treatment process for boron-containing 60Si2Mn spring steel

A spring steel and process technology, applied in the field of heat treatment process of boron-containing 60Si2Mn spring steel, can solve the problems of insufficient toughness and low yield strength of 60Si2Mn spring steel, and achieve good comprehensive mechanical properties, improved mechanical properties, and improved corrosion resistance. Effect

Pending Publication Date: 2019-09-20
XIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above prior art, the present invention provides a heat treatment process for boron-containing 60Si2Mn spring steel to solve the problems of insufficient toughness and low yield strength of 60Si2Mn spring steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A heat treatment process for boron-containing 60Si2Mn spring steel, the content of boron in steel ingots is 0.001% by mass percentage; the heat treatment process comprises the following steps:

[0028] S1: Temper and heat the steel ingot of boron-containing 60Si2Mn spring steel to 980°C, then rapidly cool it to 820°C, then cool the steel ingot to 470°C through the first cooling process, and then cool the steel ingot to room temperature through the second cooling process; ,

[0029] The first cooling process: first use water cooling liquid to cool the steel ingot to 600°C, and then air cool it to 470°C at a cooling rate of 10°C / s;

[0030] The second cooling process: using quenching liquid to cool the steel ingot to room temperature at a cooling rate of 18°C / s;

[0031] S2: Heating the steel ingot treated by S1 to 880°C at a heating rate of 8°C / s, and water quenching to 120°C after holding for 3 hours;

[0032] S3: Heat the steel ingot treated by S2 to 440°C and 490°C ...

Embodiment 2

[0034] A heat treatment process for boron-containing 60Si2Mn spring steel, the content of boron in steel ingots is 0.002% by mass percentage; the heat treatment process comprises the following steps:

[0035] S1: Temper and heat the steel ingot of boron-containing 60Si2Mn spring steel to 1000°C, then rapidly cool it to 850°C, then cool the steel ingot to 480°C through the first cooling process, and then cool the steel ingot to room temperature through the second cooling process; ,

[0036] The first cooling process: first use water cooling liquid to cool the steel ingot to 630°C, and then air cool it to 480°C at a cooling rate of 8°C / s;

[0037] The second cooling process: using a quenching liquid to cool the steel ingot to room temperature at a cooling rate of 20°C / s;

[0038] S2: Heating the steel ingot treated by S1 to 900°C at a heating rate of 10°C / s, and water quenching to 150°C after holding for 2 hours;

[0039] S3: Heat the steel ingot after S2 treatment to 450°C an...

Embodiment 3

[0041] A heat treatment process for boron-containing 60Si2Mn spring steel, the content of boron in the steel ingot is 0.0005% by mass percentage; the heat treatment process comprises the following steps:

[0042] S1: Tempering and heating the steel ingot of boron-containing 60Si2Mn spring steel to 950°C, then rapidly cooling to 800°C, then cooling the steel ingot to 450°C through the first cooling process, and then cooling the steel ingot to room temperature through the second cooling process; ,

[0043] The first cooling process: first use water cooling liquid to cool the steel ingot to 590°C, and then air cool it to 450°C at a cooling rate of 12°C / s;

[0044] The second cooling process: using a quenching liquid to cool the steel ingot to room temperature at a cooling rate of 15°C / s;

[0045] S2: Heating the steel ingot treated by S1 to 860°C at a heating rate of 5°C / s, and water quenching to 130°C after holding for 4 hours;

[0046] S3: Heat the steel ingot after S2 treatm...

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Abstract

The invention discloses a heat treatment process for boron-containing 60Si2Mn spring steel. According to the heat treatment process, a steel ingot is heated to above the austenitic transformation temperature first, then quenching is conducted, and cooling is conducted to the indoor temperature through two cooling procedures; then high temperature tempering and water quenching treatment are conducted on the steel ingot; and finally medium-temperature tempering treatment is conducted, the steel ingot is sequentially heated to two different temperatures during medium-temperature tempering, the microstructure in steel can be changed while internal stress formed in the quenching process is eliminated, and finally the spring steel with high toughness and good comprehensive mechanical properties is obtained.

Description

technical field [0001] The invention belongs to the technical field of steel production, and in particular relates to a heat treatment process for boron-containing 60Si2Mn spring steel. Background technique [0002] 60Si2Mn spring steel is widely used silicon manganese spring steel, its chemical composition is: C 0.56%~0.6%, Si1.5%~2.0%, Mn 0.6%~0.9%, S≤0.035, density is 7.85g / cm 3 , suitable for the production of flat springs with a large load or coil springs with a wire diameter of less than 30mm, but the existing 60Si2Mn spring steel has insufficient toughness, and is prone to fatigue damage during use, which seriously affects the practical life of components. [0003] The automobile leaf spring is an important bearing part in the automobile suspension system. During the driving process of the automobile, the automobile leaf spring is subjected to various stresses. The most important stress is repeated bending stress, which brings fatigue damage to the steel plate. Due t...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D6/00
CPCC21D1/18C21D6/008
Inventor 栾道成陈宝书胡志华王正云陈杰
Owner XIHUA UNIV
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