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Heat treatment method for 55Si2Mn alloy steel

A heat treatment method and alloy steel technology, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve the problems of insufficient ductility and toughness of 55Si2Mn, achieve the effects of reducing hydrogen embrittlement sensitivity, high plasticity, and improving stress corrosion resistance

Inactive Publication Date: 2012-09-12
赵佳丽
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem that the existing 55Si2Mn has insufficient plasticity and toughness while satisfying the strength, and provides a heat treatment method for 55Si2Mn alloy steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1) Heat the 55Si2Mn steel piece to 850°C for austenitization treatment, and the holding time is 8 minutes;

[0014] 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;

[0015] 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;

[0016] 4) Quenching the steel piece obtained in step 3 to room temperature.

[0017]

Embodiment 2

[0019] 1) Heat the 55Si2Mn steel piece to 855°C for austenitization treatment, and the holding time is 9 minutes;

[0020] 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;

[0021] 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;

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

Embodiment 3

[0024] 1) Heat the 55Si2Mn steel piece to 860°C for austenitization treatment, and the holding time is 9.5 minutes;

[0025] 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;

[0026] 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;

[0027] 4) Quenching the steel piece obtained in step 3 to room temperature.

[0028] After being treated by the heat treatment method of 55Si2Mn alloy steel in this embodiment, the tensile strength of 55Si2Mn alloy steel reaches 1750MPa-2100MPa, the yield strength reaches 1550MPa-1900MPa, the elongation is 6%-9%, and the area reduction rate is 28%-43 %, obtained the comprehensive mechanical performance index requirements of different ultra-high strength and excellent plasticity and toughness that meet the actual service conditions, and s...

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Abstract

The invention provides a heat treatment method for a 55Si2Mn alloy steel. The method comprises the following steps of: 1) heating a 55Si2Mn alloy steel part to the temperature of 850-860 DEG C for austenitizing treatment, wherein the heat insulation time is 8-9.5 minutes; 2) carrying out isothermal quenching in a martensite transformation temperature interval of the 55Si2Mn alloy steel, wherein the quenching temperature is 210-220 DEG C and the heat insulation time is 1-1.5 minutes; 3) carrying out isothermal partition heat treatment on the 55Si2Mn alloy steel processed in the step 2 at the partition temperature of 400-420 DEG C for 6-7 minutes: and 4) quenching the steel part obtained in the step 3 to the room temperature, and carrying out the isothermal partition heat treatment to obtain a complex phase structure composed of low carbon martensite and retained austenite as well as transformation structures of low carbon martensite and retained austenite, so that the processed 55Si2Mn alloy steel presents well coordination of high strength and high plasticity, the stress corrosion resistance is improved and the hydrogen embrittlement sensitivity is reduced.

Description

technical field [0001] The invention relates to a heat treatment method for 55Si2Mn alloy steel. Background technique [0002] 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 vehicles, automob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D11/00C21D1/20
Inventor 赵佳丽
Owner 赵佳丽
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