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

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Problems solved by technology

[0006] Aiming at the above prior art, the present invention provides a heat treatment process for boron-containing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example one

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

[0028] S1: Tempering and heating the boron-containing 60Si2Mn spring steel ingot to 980°C, then rapidly cooling to 820°C, and then cooling the ingot to 470°C through the first cooling process, and then cooling the 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 to 470°C at a cooling rate of 10°C / s;

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

[0031] S2: Heat the S1 treated steel ingot to 880°C at a heating rate of 8°C / s, hold it for 3h, and then water quench it to 120°C;

[0032] S3: Heat the S2 treated steel ingots to 440℃ and 490℃ successively ...

Example Embodiment

[0033] Example two

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

[0035] S1: Tempering and heating the boron-containing 60Si2Mn spring steel ingot to 1000°C, then rapidly cooling to 850°C, and then cooling the ingot to 480°C through the first cooling process, and then cooling the 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: cooling the steel ingot to room temperature at a cooling rate of 20°C / s with quenching liquid;

[0038] S2: Heat the S1 treated steel ingot to 900°C at a heating rate of 10°C / s, keep it for 2h, and then water quench it to 150°C;

[0039] S3: Heat the S2 treated steel ingots to 450℃ and 520℃ successiv...

Example Embodiment

[0040] Example three

[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 includes the following steps:

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

[0043] The first cooling process: first use water-cooled 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: cooling the steel ingot to room temperature at a cooling rate of 15°C / s with quenching liquid;

[0045] S2: Heat the S1 treated steel ingot to 860°C at a heating rate of 5°C / s, keep it for 4h and then water quench it to 130°C;

[0046] S3: Heat the S2 treated steel ingots to 420℃ and 480℃ successiv...

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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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