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High-strength and high-toughness spring steel and manufacturing method thereof

A manufacturing method and high-toughness technology, applied in the field of spring steel and its manufacturing, can solve the problems of high production cost, large amount of alloy added, etc., and achieve the effect of low manufacturing cost

Active Publication Date: 2014-01-01
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technical solution adopts the high-carbon + high-silicon + low-manganese alloy design route, mainly by controlling the amount of retained austenite and the size and shape to enhance the hydrogen embrittlement resistance of steel. The amount of alloy added is large and the production cost is high.

Method used

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  • High-strength and high-toughness spring steel and manufacturing method thereof
  • High-strength and high-toughness spring steel and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment A1-A10

[0069] Follow the steps below to manufacture high-strength and high-toughness spring steel, and control the mass distribution of its chemical elements as shown in Table 1:

[0070] 1) Smelting: Examples A1-A5 use electric furnace smelting, Examples A6-A10 use converter smelting, and then perform out-of-furnace refining, where Examples A1-A6 use LF furnace plus VD refining, and Examples A7-A10 use LF Add RH treatment, adjust the composition and amount of synthetic slag in the smelting process, control the content of P and S elements in the steel to be less than 0.010%, carry out argon stirring, control the vacuum degassing time to 25-40 minutes, and control the end point O content to be lower than 80ppm, N content is less than 65ppm, H content is less than 2ppm, alloying elements are added after full deoxidation, RE and Ca elements are added for sedation before tapping, to further improve the purity of steel and carry out inclusion modification treatment;

[0071] 2) Casting: use a ...

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Abstract

The invention discloses a high-strength and a high-toughness spring steel. The spring steel comprises the following chemical elements in percentage by mass: 0.34-0.49% of C, 1.00-2.80% of Si, 0.60-1.50% of Mn, 0.50-2.0% of Cr, 0.1-0.5% of Ni, 0.05-0.5% of Mo, 0.05-0.20% V, 0.0035-0.0065% of N, 0.0015-0.035% of Al, 0.0005-0.01 % of RE, 0.0005-0.005% of Ca, 0.005-0.0080% of O, and the balance of Fe and inevitable impurity wherein the following formulas are satisfied, Si+0.75*(Mn+Cr)+0.6*(Ni+Mo) is larger than or equal to 3.0%, Al / O is larger than or equal to 4.0, and RE+0.75*Ca is larger than or equal to 0.002%. Correspondingly, the invention further discloses a manufacturing method of the high-strength and high-toughness spring steel.

Description

Technical field [0001] The invention relates to a steel grade and a manufacturing method thereof, in particular to a spring steel and a manufacturing method thereof. Background technique [0002] As an important damping and functional component, springs are widely used in social production and daily life. With the advancement of science and technology and the increasing level of manufacturing, all walks of life have put forward higher requirements for spring performance, which promotes the continuous development of spring steel materials towards higher strength. [0003] The automobile manufacturing industry has always been the industry with the largest amount of spring steel. For example, in Japan, spring steel used in automobiles and motorcycles accounts for 64.9% of its total domestic spring steel production, and the annual demand exceeds 100,000 tons. Suspension spring is an important functional component in the vehicle chassis vibration damping system. Its main function is to...

Claims

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Application Information

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IPC IPC(8): C22C38/46C22C33/04C21D8/06
Inventor 姚赞张忠铧
Owner BAOSHAN IRON & STEEL CO LTD
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