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Method for processing 55Si2Mn alloy spring

A processing method and alloy technology are applied in the processing field of 55Si2Mn alloy springs, which can solve the problems of insufficient plasticity and toughness of 55Si2Mn, and achieve the effects of reducing hydrogen embrittlement sensitivity, improving stress corrosion resistance and high plasticity.

Inactive Publication Date: 2012-10-03
ZHEJIANG BUSINESS TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problem that the existing 55Si2Mn has insufficient plasticity and toughness while satisfying the strength, and provides a processing method for the 55Si2Mn alloy spring

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Heat the 55Si2Mn steel strip to 850°C for austenitizing treatment, and the holding time is 8 minutes;

[0020] 2) Then carry out austempering in the martensitic transformation temperature range of 55Si2Mn steel, the quenching temperature is 210°C, and the holding time is 1 minute;

[0021] 3) The 55Si2Mn steel treated in step 2 is isothermally partitioned and heat-treated at a partition temperature of 400°C for 6 minutes s;

[0022] 4) Quenching the steel piece obtained in step 3 to room temperature;

[0023] 5) The 55Si2Mn steel strip is cold-rolled and formed by cold-drawing spring steel wire.

[0024]

Embodiment 2

[0026] 1) Heat the 55Si2Mn steel strip to 855°C for austenitizing treatment, and the holding time is 9 minutes;

[0027] 2) Then carry out austempering in the martensitic transformation temperature range of 55Si2Mn steel, the quenching temperature is 215°C, and the holding time is 1 minute;

[0028] 3) The 55Si2Mn steel treated in step 2 is isothermally partitioned and heat-treated at a partition temperature of 410°C for 6 minutes s;

[0029] 4) Quenching the steel piece obtained in step 3 to room temperature;

[0030] 5) The 55Si2Mn steel strip is cold-rolled and formed by cold-drawing spring steel wire.

[0031]

Embodiment 3

[0033] 1) Heat the 55Si2Mn steel strip to 860°C for austenitizing treatment, and the holding time is 9.5 minutes;

[0034] 2) Then carry out austempering in the martensitic transformation temperature range of 55Si2Mn steel, the quenching temperature is 220°C, and the holding time is 1.5 minutes;

[0035] 3) The 55Si2Mn steel treated in step 2 is isothermally partitioned and heat-treated at a partition temperature of 420°C for 7 minutes s;

[0036] 4) Quenching the steel piece obtained in step 3 to room temperature;

[0037] 5) The 55Si2Mn steel strip is cold-rolled and formed by cold-drawing spring steel wire.

[0038] After the processing method of the 55Si2Mn alloy spring of this embodiment, the tensile strength of the 55Si2Mn alloy steel reaches 1750MPa-2100MPa, the yield strength reaches 1550MPa-1900MPa, the elongation rate is 6%-9%, and the area reduction rate is 28%-43 %, the comprehensive mechanical performance index requirements of different ultra-high strength and e...

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Abstract

The invention discloses a method for processing a 55Si2Mn alloy spring. The method comprises the following steps of: 1) heating a 55Si2Mn steel strip to 850 to 860 DEG C, and austenitizing; 2) performing isothermal quenching in a martensitic transformation temperature range of 55Si2Mn steel; 3) performing isothermal partition heat treatment on the 55Si2Mn steel treated in step 2 at the partition temperature of 400 to 420 DEG C for 6 to 7 minutes; 4) quenching a steel piece obtained in step 3 to room temperature; and 5) cold-rolling and forming the 55Si2Mn steel strip in a mode of cold-drawing a spring steel wire. Then a duplex microstructure consisting of low-carbon martensite, residual austenite and transformed microstructures of the low-carbon martensite and the residual austenite is obtained through isothermal partition heat treatment, so that the processed 55Si2Mn alloy steel has high strength and plasticity which are well matched, and the stress corrosion resistance is improved and the hydrogen embrittlement susceptibility is reduced; and therefore, the 55Si2Mn alloy spring has high strength and relatively high plasticity so as to meet the requirements of special occasions.

Description

[0001] technical field [0002] The invention relates to a processing method of a 55Si2Mn alloy spring. [0003] Background technique [0004] 55Si2Mn alloy spring steel is a widely used silicon-manganese spring steel, and its strength, elasticity and hardenability are slightly higher than 55Si2Mn. 55Si2Mn steel belongs to silicon-manganese alloy spring steel, which is made by increasing the content of silicon and manganese on the basis of high-quality medium carbon steel. The role of silicon is to improve the hardness, strength, yield ratio and fatigue properties of steel, while increasing the tempering stability of steel. The role of manganese is to improve the hardenability and wear resistance of steel. Due to its good comprehensive mechanical properties and low price, 55Si2Mn steel has been widely used, and the application proportion in the production of spring steel in my country is close to 60%. 55Si2Mn alloy spring steel is suitable for the manufacture of railway ...

Claims

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Application Information

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IPC IPC(8): C21D9/02C21D1/20
Inventor 杨仲辉
Owner ZHEJIANG BUSINESS TECH INST
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