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Improved 55Si2Mn alloy steel

A technology of alloy steel and weight ratio, applied in the field of improved 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 improving stress corrosion 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 an improved 55Si2Mn alloy steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Configure the raw materials according to the weight ratio of the following components of the finished casting:

[0031] Carbon C: 0.53; Silicon Si: 1.60; Manganese Mn: 0.70; Chromium Cr: 0.90; Titanium Ti: 0.10; Rare Earth: 0.20;

[0032] 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;

[0033] 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;

[0034] 4) Heating the 55Si2Mn steel casting obtained in step 3) to 850°C for austenitizing treatment, and the holding time is 8 minutes;

[0035] 5) Then c...

Embodiment 2

[0040] 1) Configure the raw materials according to the weight ratio of the following components of the finished casting:

[0041] Carbon C: 0.55; Silicon Si: 1.70; Manganese Mn: 0.80; Chromium Cr: 1.0; Titanium Ti: 0.11; Rare Earth: 0.20

[0042] 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;

[0043] 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;

[0044] 4) Heating the 55Si2Mn steel casting obtained in step 3) to 850°C for austenitizing treatment, and the ho...

Embodiment 3

[0050] 1) Configure the raw materials according to the weight ratio of the following components of the finished casting:

[0051] Carbon C: 0.57; Silicon Si: 1.80; Manganese Mn: 0.90; Chromium Cr: 1.10; Titanium Ti: 0.12; Rare Earth: 0.20;

[0052] 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;

[0053] 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;

[0054] 4) Heat the 55Si2Mn steel casting obtained in step 2) to 860°C for austenitizing treatment, and the holding time is 9.5 minutes;

[0055]5) Then car...

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Abstract

The invention discloses improved 55Si2Mn alloy steel, which is made by the following steps: making a casting by using a fusion method, wherein the finished casting product comprises the following components in part by weight: 0.53 to 0.57 part of C, 1.60 to 1.80 parts of Si, 0.70 to 0.90 part of Mn, 0.90 to 1.10 parts of Cr, 0.10 to 0.12 part of Ti and 0.20 part of rare earth; heating the obtained 55Si2Mn steel casting to the temperature of between 850 and 860DEG C for austenization, and keeping the temperature for 8 to 9.5 minutes; performing isothermal quenching at the temperature of between 210 and 220DEG C for 1 to 1.5 minutes in a martensite transformation temperature range of the 55Si2Mn steel; performing isothermal partition heat treatment on the treated 55Si2Mn steel at the partition temperature of between 400 and 420DEG C for 6 to 7 minutes; and quenching the obtained steel part to room temperature. A complex phase structure consisting of low carbon martensite and retained austenite, and transformation structures thereof is obtained through isothermal partition heat treatment, so that the treated 55Si2Mn alloy steel has well matched high strength and high plasticity, the stress corrosion resistance is improved, and the hydrogen embrittlement susceptibility is reduced, so that the improved 55Si2Mn alloy steel has high strength and plasticity to meet the requirements of special occasions.

Description

[0001] technical field [0002] The invention relates to an improved 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 vehicles, auto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/34C21D1/20C21D1/00C21D6/00
Inventor 冯斌
Owner 冯斌