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Preparation method of 55Si2Mn alloy steel

A technology for alloy steel and steel parts, which is applied in the field of preparation of 55Si2Mn alloy steel, can solve the problems of insufficient ductility and toughness of 55Si2Mn, and achieve the effects of reducing hydrogen embrittlement sensitivity, high plasticity, and good wear resistance

Inactive Publication Date: 2012-09-19
冯斌
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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 of insufficient ductility and toughness of the existing 55Si2Mn while satisfying the strength, and provides a preparation method of 55Si2Mn alloy steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Configure the raw materials according to the weight ratio of the following components of the finished casting:

[0029] Carbon C: 0.53; Silicon Si: 1.60; Manganese Mn: 0.70; Chromium Cr: 0.90; Titanium Ti: 0.10; Rare Earth: 0.20;

[0030] 2) Choose to melt in a 0.75 t intermediate frequency coreless induction furnace. Melt carbon steel first, and then load ferrochrome with the material. After the furnace material is melted, add ferrosilicon and ferromanganese when the furnace temperature reaches 1580-1600°C. The material block is 50 ~60mm; out of the furnace after deoxidizing with aluminum;

[0031] 3) Rare earth alloys and ferroboron are crushed to small particles below 10 mm, and ferrotitanium is crushed to small particles below 5 mm, and the bag-in-pack method is used for review and deterioration treatment;

[0032] 4) Heating the 55Si2Mn steel casting obtained in step 3) to 850°C for austenitizing treatment, and the holding time is 8 minutes;

[0033] 5) Then c...

Embodiment 2

[0038] 1) Configure the raw materials according to the weight ratio of the following components of the finished casting:

[0039] Carbon C: 0.55; Silicon Si: 1.70; Manganese Mn: 0.80; Chromium Cr: 1.0; Titanium Ti: 0.11; Rare Earth: 0.20

[0040] 2) Choose to melt in a 0.75 t intermediate frequency coreless induction furnace. Melt carbon steel first, and then load ferrochrome with the material. After the furnace material is melted, add ferrosilicon and ferromanganese when the furnace temperature reaches 1590°C. The material should be as small as possible. , preferably around 50-60mm; use aluminum to deoxidize and then release from the furnace;

[0041] 3) Rare earth alloys and ferroboron are crushed to small particles below 10 mm, and ferrotitanium is crushed to small particles below 5 mm, and the bag-in-pack method is used for review and deterioration treatment;

[0042] 4) Heating the 55Si2Mn steel casting obtained in step 3) to 850°C for austenitizing treatment, and the ho...

Embodiment 3

[0048] 1) Configure the raw materials according to the weight ratio of the following components of the finished casting:

[0049] Carbon C: 0.57; Silicon Si: 1.80; Manganese Mn: 0.90; Chromium Cr: 1.10; Titanium Ti: 0.12; Rare Earth: 0.20;

[0050] 2) Choose to melt in a 0.75 t intermediate frequency coreless induction furnace. Melt carbon steel first, and then load ferrochrome with the material. After the furnace material is melted, add ferrosilicon and ferromanganese when the furnace temperature reaches 1580-1600°C. The material block is 50 ~60mm; out of the furnace after deoxidizing with aluminum;

[0051] 3) Rare earth alloys and ferroboron are crushed to small particles below 10 mm, and ferrotitanium is crushed to small particles below 5 mm, and the bag-in-pack method is used for review and deterioration treatment;

[0052] 4) Heat the 55Si2Mn steel casting obtained in step 2) to 860°C for austenitizing treatment, and the holding time is 9.5 minutes;

[0053] 5) Then ca...

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Abstract

The invention discloses a preparation method of 55Si2Mn alloy steel. The method includes the following steps that a casting is obtained through a melting method and the finished casting contains the following ingredients by weight proportion: 0.53-0.57 part of C, 1.60-1.80 parts of Si, 0.70-0.90 part of Mn, 0.90-1.10 parts of Cr, 0.10-0.12 part of Ti and 0.20 part of rear earth; the55Si2Mn steel casting obtained in the step is heated to 850-860 DEG C, then the casting is subjected to austenitization treatment and the thermal insulation time is 8-9.5mins; isothermal quenching is carried out within the temperature interval in which the martensite of the 55Si2Mn steel transforms,the quenching temperature is 210-220 DEG C and the thermal insulation time is 1-1.5mins; then the processed 55Si2Mn steel is subjected to isothermal partition heat treatment under the partition temperature of 400-420 DEG C for 6-7mins; and finally the obtained steel is quenched to room temperature. The 55Si2Mn steel casting is subjected to isothermal partition heat treatment to obtain a complex phase structure consisting of a low carbon martensite, a retained austenite and transformed structures of the martensite and the austenite, and the 55Si2Mn alloy steel processed in such a way presents excellent combined properties of high strength and high ductility. At the same time, stress corrosion resistance of the 55Si2Mn alloy steel is improved, and the hydrogen embrittlement susceptibility of the55Si2Mn alloy steel is reduced. The 55Si2Mn alloy steel prepared through the method has higher strength and at the same time has higher ductility so as to satisfy the requirements in special occasions.

Description

[0001] technical field [0002] The invention relates to a preparation method of 55Si2Mn alloy steel. [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 ve...

Claims

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Application Information

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IPC IPC(8): C22C38/34C22C33/06C21D1/18
Inventor 冯斌
Owner 冯斌