专利名称：SPRING AND MANUFACTURING METHOD
THEREOF
发明人：SUZUKI, TAKESHI,ONO,
YOSHIKI,KUROKAWA, SHIMPEI
申请号：EP12755633申请日：20120301公开号：EP2682493A4公开日：20140827
摘要：A spring with superior fatigue resistance and a production method therefor areprovided by decreasing the material cost and simplifying the production process. There isprovided with a spring comprising: a composition consisting of, by mass %, 0.5 to 0.7 % ofC, 1.0 to 2.0 % of Si, 0.1 to 1.0 % of Mn, 0.1 to 1.0 % of Cr, not more than 0.035 % of P, notmore than 0.035 % of S, and the balance of Fe and inevitable impurities; a structureincluding not less than 95 % of tempered martensitic structure by area ratio in a crosssection of a wire material; a compressive residual stress layer formed from a surface to adepth of 0.35 mm to D/4, in which D (mm) is a circle-equivalent diameter of a crosssection, the compressive residual stress layer having maximum compressive residualstress of 800 to 2000 MPa; a center portion with Vickers hardness of 550 to 700 HV in thecross section; and a high hardness layer with greater hardness than the center portion by50 to 500 HV from a surface to a depth of 0.05 to 0.3 mm.
申请人：NHK SPRING CO.,LTD.
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