Steel wire material for spring with excellent acid rinsing property

A steel wire, quality technology, applied in the direction of springs, springs/shock absorbers, coil springs, etc., to achieve the effects of excellent surface properties, high fatigue characteristics, and excellent pickling properties

Inactive Publication Date: 2007-05-23
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, in the above method, in addition to Cr and Si, expen

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  • Steel wire material for spring with excellent acid rinsing property
  • Steel wire material for spring with excellent acid rinsing property
  • Steel wire material for spring with excellent acid rinsing property

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[0019] The inventors of the present invention have made intensive studies in order to improve the pickling properties of the steel wire material for springs containing a large amount of Si and Cr. As a result, as will be described in detail later, it is pointed out that, in particular, if the heating step and soaking step before hot rolling are appropriately controlled, the concentration of Cr on the surface of the wire rod (especially the concentration of Cr in fayalite) is suppressed, and the Cr concentration of the surface layer is suppressed. The difference between the Cr concentration and the Cr concentration in the steel (hereafter, it may be abbreviated as ΔCr) is significantly reduced, so that the pickling property is remarkably improved, and the present invention has been completed.

[0020] The present invention will be described in detail below.

[0021] As described above, the steel wire material for springs of the present invention contains: C: 0.35 to 0.7%, Si: 1...

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Abstract

The steel wire material for spring in accordance with the present invention comprises, on the percent by mass basis, C: 0.35 to 0.7%, Si: 1.4-2.5%, Mn: 0.05-1.0%, Cr: 0.5-1.9%, P: less than 0.02% (not including 0%), and S: less than 0.02% (not including 0%), wherein the concentration difference of Cr between on the surface and in the steel is less than 2.50%. Plenty of steel wire materials containing Si and Cr have excellent acid rinsing property even without additional alloy components containing necessary component such as Mo and the like.

Description

technical field [0001] The present invention relates to a steel wire material for springs excellent in pickling properties, and more specifically, to a steel wire material for springs containing a large amount of Si and Cr as alloy elements. The steel wire material for springs of the present invention is suitable for valve springs used in engines such as automobiles, clutch springs, brake springs, stabilizers, suspension springs such as torsion bars, and the like. Background technique [0002] The chemical composition of steel for springs used for valve springs, suspension springs, etc. is specified, for example, in JIS G3565 to JIS G 4801, and appropriate steel types are used depending on the type of spring design and the like. Recently, with the reduction of exhaust gas and fuel consumption, the size and weight of springs have been promoted, and the design stress of springs has also increased. For example, it is expected that the tensile strength of spring wire (quenched a...

Claims

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Application Information

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IPC IPC(8): C22C38/18C22C38/24C22C38/26C22C38/28C22C38/40F16F1/00
CPCC22C38/002C22C38/04C22C38/24C22C38/26C22C38/28C22C38/34C22C38/40F16F1/04
Inventor 吉原直
Owner KOBE STEEL LTD
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