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公开(公告)号：EP3020841A4
公开(公告)日：2017-03-29
申请号：EP14823237
申请日：2014-07-08
发明人： YAMAMOTO FUMIO , TSURUGAI KENGO , YOSHIHARA NAO , MASUMOTO KEI , OURA HIROSHI , JINBO TETSUO , MAEHATA TOSHIO , YAMAMOTO YOSHIHARU
IPC分类号： C22C38/00 , C21D1/06 , C21D1/773 , C21D6/00 , C21D9/02 , C22C38/04 , C22C38/06 , C22C38/24 , C22C38/26 , C22C38/34 , C22C38/46 , C22C38/48 , C23C8/22
CPC分类号： C21D9/02 , C21D1/06 , C21D1/773 , C21D6/004 , C21D6/005 , C21D6/008 , C22C38/00 , C22C38/002 , C22C38/04 , C22C38/06 , C22C38/24 , C22C38/26 , C22C38/34 , C22C38/46 , C22C38/48 , C23C8/22
摘要： To provide a coil spring having excellent fatigue resistance. Disclosed is a coil spring made of steel, including (in % by mass, the same shall apply for a chemical composition): C: 0.40 to 0.70%; Si: 1.50 to 3.50%; Mn: 0.30 to 1.50%; Cr: 0.10 to 1.50%; V: 0.50 to 1.00%, and Al: 0.01% or less (excluding 0%), with the balance being iron and inevitable impurities, wherein an average crystal grain size number of prior austenite crystals in a depth of 0.3 mm from a surface is 11.0 or more, while a difference in grain size number between the respective prior austenite crystals is in a range of less than 3 from a grain size number observed at the maximum frequency, and wherein a carburized layer is provided in a depth of 0.30 to 1.00 mm from the surface, while an average Vickers hardness is 600 or higher at a position in a depth of (1/4) × diameter in the depth direction from the surface.
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2.发明公开STEEL WIRE FOR HIGH STRENGTH SPRING EXCELLENT IN WORKABILITY AND HIGH STRENGTH SPRING 有权钢丝以优异的加工性和高强度弹簧用高强度弹簧
公开(公告)号：EP1619264A4
公开(公告)日：2007-08-15
申请号：EP04723329
申请日：2004-03-25
发明人： SUDA SUMIE , IBARAKI NOBUHIKO , TAKAMURA NORITOSHI , TERAKADO NAOKI , TENDO SATORU , FUJIWARA TADAYOSHI , JINBO TETSUO
摘要： A steel wire for a spring, characterized in that it has a tempering martensite structure and comprises 0.53 to 0.68 % of C, 1.2 to 2.5 % of Si, 0.2 to 1.5 % of Mn, 1.4 to 2.5 % of Cr, 0.05 % or less of Al, and contains, as optional elements, 0.4 % or less of Ni, 0.4 % or less of V, 0.05 to 0.5 % of Mo, 0.05 to 0.5 % of Nb, and others, the balance being Fe and inevitable impurities, old austenite grains have a grain size number of 11.0 or more, and it exhibits an offset yield strength ratio (sigma0.2/sigmaB) of 0.85 or less. The steel wire is a high strength steel wire for a spring which is excellent in both of the resistance to setting and fatigue characteristics, and further excellent in workability (cold workability).
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3.发明公开STEEL WIRE ROD FOR HARD DRAWN SPRING, DRAWN WIRE ROD FOR HARD DRAWN SPRING AND HARD DRAWN SPRING, AND METHOD FOR PRODUCING HARD DRAWN SPRING 有权盘条冷拉弹簧，拉丝FOR硬拉弹簧和冷拉弹簧及其制造方法硬拉SPRING
公开(公告)号：EP1347072A4
公开(公告)日：2005-08-31
申请号：EP01271461
申请日：2001-12-19
发明人： IBARAKI NOBUHIKO , INADA ATSUSHI , SUDA SUMIE , TAKAMURA NORITOSHI , TENDOH SATORU , FUJIWARA TADAYOSHI , JINBO TETSUO
CPC分类号： F16F1/021 , C21D1/20 , C21D7/06 , C21D8/065 , C21D9/02 , C21D9/525 , C21D2211/009 , C22C38/04 , C22C38/34 , C22C38/46
摘要： A steel wire rod for a spring for use in producing a hard drawn spring, which comprises, in mass %, C: 0.5 % or more and less than 0.7 %, Si: 1.4 to 2.5 %, Mn: 0.5 to 1.5 %, Cr: 0.05 to 2.0 % and V: 0.05 to 0.40 %, and has the area rate Rp of a pearlite structure satisfying the following formula (1): Rp (area %) = 55 x [C] + 61 ... (1) wherein [C] represents the content (mass %) of C. A hard drawn spring produced by using the above steel wire rod exhibits the fatigue strength and resistance to setting which are comparable or superior to those of a spring produced through drawing an oil tempered steel wire rod.
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