Email:cnfuruide@gmail.comHenan Friend Metal Products Co.,Ltd

Henan Friend Metal Products Co.,Ltd

Introduction of valve spring

In all spring products, there is no more stringent material requirements than the valve springs, especially the high stress and abnormal cross section valve springs are nearly harsh to the material requirements:

High strength: tensile strength 2000MPa.

Excellent surface quality: the surface does not allow complete decarburization, half maximum decarburization depth can not exceed 0.5% of the diameter of the wire, the maximum surface defect depth is less than 40 m, to meet the requirements of steel wire in the machining process, the surface to be peeled and through two ways (through type and rotary type) of the eddy current detection, identification of defective parts automatic spray.

Ultra pure grade: inclusions on the oxide and sulfide reached 0, oxygen content, nitrogen content and materials in both the content of copper, aluminum and titanium control requirements, so we need from the source to control the production of smelting valve spring steel.

Good relaxation performance: the service load of the valve spring is lower than 5% under long term service condition of 120~150 degrees centigrade.

Uniformity of strength: the maximum strength difference of the same disc material is not more than 140MPa, the special-shaped section material, such as oval shaped section, faces the curvature tangent point of different circles, and the elliptic section has special requirements for the long and short axis.

Foreign special steel wire for valve spring production mainly concentrated in Japan and South Korea, Sweden, Japan, manufacturers have SUZUKI, Kobelco, Sumitomo Sanxing steel line, South Korea KiSWire, Sweden Garphyttan, they almost monopolized all shaped Chinese and high stress of valve spring wire in the market, the annual import volume has reached more than 6500t.

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