Rolled steel material for high-strength spring and wire for high-strength spring using same

A high-strength, rolled material technology, applied in the field of high-strength spring rolled material and high-strength spring wire, can solve the problem of hydrogen embrittlement resistance without any consideration, only focusing on strong wire drawing, etc., to achieve wire drawing Excellent workability, improved wire drawing workability, and excellent manufacturability effects

Inactive Publication Date: 2016-08-10
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in Patent Document 3, only emphasis is placed on the drawability under special processing such as strong drawing, and no consideration is given to hydrogen embrittlement resistance after quenching and tempering, which is most important in suspension springs and the like.

Method used

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  • Rolled steel material for high-strength spring and wire for high-strength spring using same
  • Rolled steel material for high-strength spring and wire for high-strength spring using same
  • Rolled steel material for high-strength spring and wire for high-strength spring using same

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Embodiment

[0123] Hereinafter, the present invention will be described more specifically with reference to examples. The present invention is not limited to the following examples, and can of course be appropriately modified and implemented within the scope of meeting the aforementioned and later-described gist, and these are included in the technical scope of the present invention.

[0124] Steel materials with the chemical compositions shown in Tables 1 to 3 were smelted in a converter, and homogenized at 1100°C or higher after continuous casting. After the homogenization treatment, billet rolling was performed, heated at 1100-1280° C., and then hot-rolled to obtain a wire rod with a diameter of 14.3 mm, that is, a rolled material. Whether the molten steel has degassing treatment, coil coiling temperature TL after hot rolling, and cooling conditions after coiling are as described in Tables 4 to 6. In addition, the test example described as "implementation" in the column of homogenizati...

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Abstract

The purpose of the present invention is to provide a rolled steel material which is for use in a high-strength spring, which exhibits excellent wire drawability even when the amount of an alloying element added is reduced, and which exhibits excellent corrosion fatigue characteristics after quenching and tempering. A rolled steel material for a high-strength spring, characterized in that: the rolled steel contains C, Si, Mn, P, S, Al, Cu and Ni; the nondiffusible hydrogen content is 0.40massppm or less; the area fraction of ferrite in terms of percentage satisfies relationship (1); and the total area fraction of bainite and martensite is 2% or less. Area fraction of ferrite<{(0.77-[C]) / 0.77-[C] / 3+0.08}*100 ... (1) wherein "[element]" represents the content of the element in terms of mass%.

Description

technical field [0001] The present invention relates to a rolled material for high-strength springs and a wire material for high-strength springs using the same. Specifically, it is a rolled material and wire material useful as a raw material of a high-strength spring used in a quenched and tempered state, especially a rolled material with excellent wire drawing workability, and wire material processing Even if the final tensile strength is high strength of 1900MPa or more, it is a high-strength spring wire material with excellent corrosion fatigue characteristics. Background technique [0002] Coil springs used in automobiles, such as valve springs and suspension springs used in engines and suspensions, are required to reduce weight and increase strength in order to reduce exhaust gas and improve fuel efficiency. In the manufacture of high-strength wire, wire drawing is performed for the purpose of improving the dimensional accuracy of the wire diameter and making the stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00B21C1/00C21D3/06C21D8/06C21D9/52C22C38/16C22C38/54
CPCB21C1/00C21D3/06C21D8/06C21D9/52C22C38/00C22C38/16C22C38/54C22C38/001C22C38/002C22C38/04C22C38/06C22C38/34C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C21D2211/005C21D2211/009C21D1/18C21D8/065C21D9/525C21D2211/002C21D2211/008C21D2261/00C22C38/02C22C38/08C22C38/12C22C38/14B21C1/003
Inventor 竹田敦彦增田智一高山将
Owner KOBE STEEL LTD
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