Steel wire material for spring with excellent acid rinsing property

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...

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Problems solved by technology

[0010] However, in the above method, in addition to Cr and Si, expensive alloy elements such as Mo must be added as essential components.

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