Steel wire for high-strength spring having exceptional coiling performance and hydrogen embrittlement resistance, and method for manufacturing same

A manufacturing method and high-strength technology, applied in the direction of springs, manufacturing tools, furnace types, etc., can solve the problems of undisclosed high-strength, etc., and achieve the effects of excellent corrosion resistance, suppressed manufacturing costs, and excellent coilability

Inactive Publication Date: 2015-01-28
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, Patent Document 5 does not disclose that high strength can be achieved without using these Cr etc.

Method used

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  • Steel wire for high-strength spring having exceptional coiling performance and hydrogen embrittlement resistance, and method for manufacturing same
  • Steel wire for high-strength spring having exceptional coiling performance and hydrogen embrittlement resistance, and method for manufacturing same
  • Steel wire for high-strength spring having exceptional coiling performance and hydrogen embrittlement resistance, and method for manufacturing same

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Embodiment Construction

[0042] In order to solve the above-mentioned problems, the inventors of the present invention have made intensive studies to obtain a steel wire for springs that exhibits high strength without using alloy elements such as Cr and is excellent in coilability and hydrogen embrittlement resistance. As a result, it was found that even without using high-priced alloy elements, if the composition composed of basic components is controlled, and especially the quenching and tempering conditions in the manufacturing process are controlled, the structure described below is ensured without reducing the strength. The above-mentioned excellent characteristics can be achieved, and the present invention has been completed.

[0043] First, the reason for specifying the organization in the present invention will be described.

[0044] [organize]

[0045] [Amount of retained austenite (retained γ): 6 to 15 area%]

[0046] Austenite is soft and essentially a highly ductile phase. Therefore, by...

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Abstract

The present invention provides a spring steel wire that demonstrates high strength without being doped with large quantities of alloy elements, and makes it possible to obtain a cold winding spring having exceptional coiling performance and improved hydrogen embrittlement resistance. The spring steel wire is characterized in comprising 0.40 to 0.65 percent by mass of C, 1.0 to 3.0 percent by mass of Si, 0.6 to 2.0 percent by mass of Mn, 0.015 mass percent or less (excluding 0%) of P, 0.015 percent by mass or less (excluding 0%) of S, and 0.001 to 0.10 percent by mass of Al, the balance being made up of iron and impurities; 70% or more of the area of the entire structure being tempered martensite, and 6 to 15% of the area of the entire structure being residual austenite, the old austenite crystal grain size number as determined using the method defined in JIS G 0551 being 10.0 or higher and the tensile strength being 1900 MPa or higher.

Description

technical field [0001] The present invention relates to a high-strength spring steel wire excellent in coilability and hydrogen embrittlement resistance (hydrogen embrittlement resistance characteristics), and a method for producing the same. Specifically, it is a steel wire for springs (such as coil springs) that is used in the quenched and tempered (quenched and tempered) state, has a high tensile strength of 1900 MPa or more, and is excellent in coilability and hydrogen embrittlement resistance, and its manufacturing method. Background technique [0002] Coil springs used in automobiles (for example, valve springs and suspension springs used in engines and suspension systems, etc.) are required to reduce weight and increase strength in order to reduce exhaust gas and improve fuel efficiency. [0003] Among the manufacturing methods of the above-mentioned coil springs, there are two methods of hot coiling and cold coiling. The cold coil is to draw the steel wire rod for s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/52C22C38/06C22C38/16
CPCC22C38/06C21D9/52C22C38/02C22C38/04C22C38/16C22C38/00C21D1/18C22C38/12C22C38/14C21D8/065C21D9/02C21D9/525C21D2211/008C22C38/08F16F1/021
Inventor 竹田敦彦吉原直
Owner KOBE STEEL LTD
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