Steel wire for spring excellent in fatigue property and drawing property

A fatigue characteristic and wire drawing technology, applied in the direction of spring/shock absorber, coil spring, furnace type, etc., can solve the problem of not necessarily satisfying, and achieve the effect of preventing embrittlement, excellent fatigue characteristic, excellent strength and wire drawing.

Inactive Publication Date: 2009-09-09
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In addition, the present inventors have confirmed that the steel wire disclosed in Patent Document 2 is a very useful steel

Method used

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  • Steel wire for spring excellent in fatigue property and drawing property
  • Steel wire for spring excellent in fatigue property and drawing property
  • Steel wire for spring excellent in fatigue property and drawing property

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0097] The steels (steel grades A to K) with the chemical compositions shown in Table 1 were melted in a small vacuum furnace and cast, then cooled at the cooling rate shown in Table 2, and then hot forged to obtain rods with a side of 155 mm. Next, hot rolling was performed under the rolling conditions shown in Table 2 to obtain a steel wire rod with a diameter of 9.0 mm, and then peeled and cut to adjust the diameter to 8.4 mm, and then lead quenching was performed under the conditions shown in Table 2 Afterwards, wire drawing was carried out until the wire diameter shown in Table 2 was obtained to obtain a wire drawing material (steel wire).

[0098] Specifically, in the above-mentioned lead quenching process, as shown in Table 2, the austenitizing heating temperature and heating retention time were changed, and the cooling rate (line speed) was adjusted to vary the lead quenching time for each kind of steel (lead passage time of the line in the bath). The temperature of t...

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Abstract

The present invention discloses a steel wire for springs which shows excellent drawing properties when used not only as a steel wire for springs for cold winding which is to be drawn, subsequently quenched/tempered, and processed into a steel spring, but also as a steel wire for springs for cold winding which is drawn and then directly processed into a steel spring. It gives a spring having excellent fatigue properties. The steel wire for springs, which is excellent in fatigue properties and drawing properties, comprises a steel containing carbon, silicon, manganese, chromium, titanium, boron, etc. in specific amounts and having boron, titanium, and nitrogen contents (wt.%) satisfying the following relationship (1): 0.03=B/(Ti/3.43-N)=5.0, the amount of boron in solution being 0.0005-0.0040% and the remainder being iron and incidental impurities. In the steel wire, the boron in solution is present at perlite nodule boundaries in a higher concentration.

Description

technical field [0001] The present invention relates to a steel wire for springs excellent in fatigue properties and drawability, and more specifically, to a steel wire for springs that can be used as a steel wire for springs for cold coiling that can be processed into steel springs by quenching and tempering after wire drawing, In addition, as a steel wire for springs for cold coiling, which is processed into a steel spring in a drawn state, it exhibits excellent drawability, and when processed into a spring shape, a spring steel wire with excellent fatigue characteristics is obtained. Background technique [0002] With the reduction in weight and high stress of motor vehicles, the valve springs or clutch springs used in engines, clutches, suspensions, or suspension springs are also required to be high-stress and increased, and there is an increase in the spring relative to the spring. Tendency to load stress, therefore, a spring with excellent fatigue strength is required....

Claims

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Application Information

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IPC IPC(8): C22C38/00C21D8/06C21D9/52C22C38/34C22C38/54F16F1/06
CPCC21D8/06C21D9/52C22C38/00C21D8/065C22C38/001C22C38/04C22C38/06C22C38/28C22C38/32C22C38/34
Inventor 吉原直
Owner KOBE STEEL LTD
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