High-strength corrosion-resistant spring steel and manufacturing method thereof

A manufacturing method and high-strength technology, applied in the field of spring steel and its manufacturing, can solve the problems of easy fracture and affecting vehicle safety, etc., achieve long corrosion fatigue life, decrease corrosion rate and corrosion pit depth, and good corrosion resistance and the effect of fracture resistance

Active Publication Date: 2016-08-24
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, after the strength of the spring material is improved, its performance in a humid environment (containing Cl - Ion) It is extremely prone to fracture and affects vehicle safety

Method used

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  • High-strength corrosion-resistant spring steel and manufacturing method thereof
  • High-strength corrosion-resistant spring steel and manufacturing method thereof
  • High-strength corrosion-resistant spring steel and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A1-A12 and comparative example B1-B3

[0068] The high-strength corrosion-resistant spring steel in the above-mentioned embodiments and comparative examples adopts the following steps to make (the specific process parameters of each embodiment and comparative examples are referring to Table 2):

[0069] (1) smelting and refining, control the mass percentage distribution of the chemical elements of Examples A1-A12 and Comparative Examples B1-B3 as shown in Table 1;

[0070] (2) Continuous casting;

[0071] (3) Bloom rolling;

[0072] (4) heating;

[0073] (5) Finish rolling;

[0074] (6) Stelmore cooling after rolling, the wire rod structure is sorbite plus a very small amount of ferrite after Stelmore cooling;

[0075] (7) wire rod drawing;

[0076] (8) Heat treatment: quenching + tempering, wherein the heating temperature before quenching is 890-1100°C, the temperature of the quenching medium is 15-40°C, and the tempering temperature is 375-510°C.

[0077]

[0078]

[0079]

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Abstract

The invention discloses high-strength corrosion-resistant spring steel. The high-strength corrosion-resistant spring steel is manufactured from the following chemical elements in percentage by weight: 0.50-0.65% of C, 1.35-2.20% of Si, 0.55-1.55% of Mn, 0.60-1.70% of Cr, 0.20-1.2% of Ni, 0.20-1.0% of Cu, 0.05-0.20% of V, 0.01-0.15% of Nb, 0.001-0.020% of Al, 0.002-0.008% of N, 0.0007-0.006% of O, and the balance being Fe and other inevitable impurities. Accordingly, the invention further provides a manufacturing method of the high-strength corrosion-resistant spring steel. The tensile strength of the high-strength corrosion-resistant spring steel disclosed by the invention can reach 2000MPa or above, and besides, the high-strength corrosion-resistant spring steel has good corrosion resistant property and fracture resistant property, so that development requirements of automobile trade can be met.

Description

technical field [0001] The invention relates to a spring steel and a manufacturing method thereof, in particular to a corrosion-resistant spring steel and a manufacturing method thereof. Background technique [0002] As an important shock-absorbing and functional component, springs are widely used in all aspects of social production and people's lives. With the advancement of science and technology and the improvement of manufacturing level, various industries have put forward higher requirements for spring performance, which promotes the continuous development of spring steel materials towards higher strength. Automobile manufacturing has always been the industry with the largest consumption of spring steel. For example, in Japan, the springs used in automobiles and motorcycles account for 64.9% of the total domestic spring steel production, and the annual demand exceeds 100,000 tons. Suspension spring is an important functional part in the vibration damping system of auto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C38/16C22C38/12C22C38/08C22C38/06C22C38/04C22C38/02C22C33/04C21D1/18
CPCC21D1/18C22C33/04C22C38/001C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/16C22C38/18
Inventor 姚赞万根节黄宗泽金峰吴振平
Owner BAOSHAN IRON & STEEL CO LTD
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