公开(公告)号：US06406565B1

公开(公告)日：2002-06-18

申请号：US09686032

申请日：2000-10-11

申请人： Masayuki Hashimura ,  Hiroshi Hagiwara ,  Takanari Miyaki ,  Toshio Banno

发明人： Masayuki Hashimura ,  Hiroshi Hagiwara ,  Takanari Miyaki ,  Toshio Banno

IPC分类号： C22C3828

CPC分类号： C21D9/02 ,  C21D1/18 ,  C22C38/001 ,  C22C38/04 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/50 ,  C22C38/54 ,  Y10S148/908

摘要： The present invention provides a spring steel showing a sufficient reduction in area and an impact toughness while the steel has a high strength, in particular a tensile strength as high as at least 1,500 Mpa. A high toughness spring steel according to the present invention comprises, based on mass, 0.45 to 0.85% of C, 0.9 to 2.5% of Si, 0.1 to 1.2% of Mn, 0.1 to 2.0% of Cr, 0.005 to 0.07% of Ti, 0.001 to 0.007% of N, the Ti content being greater than four times the N content in terms of percent by mass, 0.0005 to 0.0060% B, at least one of 0.0005 to 0.01% Mg, 0.0005 to 0.01% La, and 0.0005 to 0.01% Ce, P and S with restrictive contents of less than 0.020% and less than 0.020%, respectively, and the balance of Fe and unavoidable impurities, and selectively contains V, Nb, Ni, Mo and Cu. The percent area of oxides and sulfides is not more than 0.1%.

摘要翻译： 本发明提供了一种弹簧钢，其具有足够的面积减小和冲击韧性，而钢具有高强度，特别是高达至少1,500Mpa的拉伸强度。 根据本发明的高韧性弹簧钢，以质量计含有C：0.45〜0.85％，Si：0.9〜2.5％，Mn：0.1〜1.2％，Cr：0.1〜2.0％，Ti：0.005〜0.07％ ，0.001〜0.007％的N，Ti含量大于N含量的四倍，按质量百分比计，0.0005〜0.0060％B，0.0005〜0.01％的Mg，0.0005〜0.01％的La和0.0005 至0.01％的Ce，P和S，其限制含量分别小于0.020％且小于0.020％，余量为Fe和不可避免的杂质，并选择性地含有V，Nb，Ni，Mo和Cu。 氧化物和硫化物的面积百分比不超过0.1％。