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A kind of high-strength high-toughness spring steel and its manufacturing method

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 and large amount of added alloy, and achieve the effect of low manufacturing cost

Active Publication Date: 2016-06-01
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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  • A kind of high-strength high-toughness spring steel and its manufacturing method
  • A kind of high-strength high-toughness spring steel and its manufacturing method

Examples

Experimental program
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Effect test

Embodiment A1-A10

[0069] Manufacture high-strength and high-toughness spring steel according to the following steps, and control the mass percentage distribution of its chemical elements as shown in Table 1:

[0070] 1) Smelting: Examples A1-A5 are smelted in an electric furnace, Examples A6-A10 are smelted in a converter, and then refined outside the furnace, wherein Examples A1-A6 use LF furnace plus VD refining, and Examples A7-A10 use LF Add RH treatment, adjust the synthetic slag composition and addition amount during the smelting process, control the content of P and S elements in the steel to less than 0.010%, carry out argon stirring, control the vacuum degassing time to 25-40 minutes, and control the O content at the end point to less 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 to calm the steel before tapping, so as to further improve the purity of the steel and carry out inclusi...

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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 steel grades 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 put forward higher requirements for spring performance, thus promoting 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, the spring steel used in automobiles and motorcycles accounts for 64.9% of the total domestic spring steel production, and the annual demand exceeds 100,000 tons. Suspension spring is an important functional component in the chassis damping system of the automobile. Its main function ...

Claims

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Application Information

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