公开(公告)号：US06679954B1

公开(公告)日：2004-01-20

申请号：US09913920

申请日：2001-08-17

申请人： Koji Takano ,  Takayoshi Matsui ,  Koichi Yoshimura

发明人： Koji Takano ,  Takayoshi Matsui ,  Koichi Yoshimura

IPC分类号： C22C3844

CPC分类号： C22C38/42 ,  C21D9/0093 ,  C21D2211/001 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/44 ,  C22C38/54 ,  C22C38/58 ,  C23C8/26

摘要： The present invention makes the best use of a low-cost chemical composition in providing a high strength and high corrosion resistance stainless steel, which has improved delayed fracture resistance and toughness in particular, for building and construction uses, and as, for example, a stainless steel tapping screw. The present invention is, specifically, a stainless steel and a stainless steel screw with high strength and high toughness and excellent in delayed fracture resistance, characterized by: comprising, by mass, 0.01 to 0.25% of C, 0.05 to 1.0% of Si, 0.1 to 2.0% of Mn, 0.1 to 3.0% of Ni, 11.0 to 16.0% of Cr, 0.01 to 0.15% of N, and 0.01 to 3.0% of Mo; containing, optionally, 0.001 to 0.005% of B and/or one or more of 0.05 to 0.5% of Ti, 0.05 to 0.5% of Nb, and 0.05 to 0.5% of W; having less than 10% of ferrite in the center portion of the material; and having a mixed structure of martensite and 3 to 30% of austenite in the surface layer from the outermost surface to the depth of at least 1 &mgr;m, and a method to produce the same.

摘要翻译： 本发明在提供高强度，高耐腐蚀性的不锈钢中充分利用了低成本的化学组成，特别是对于建筑和建筑用途而言，其具有改善的延迟抗断裂性和韧性，并且例如为 不锈钢自攻螺丝。 本发明具体地说是具有高强度，高韧性，耐延迟断裂性优异的不锈钢和不锈钢螺杆，其特征在于：以质量计含有0.01〜0.25％的C，0.05〜1.0％的Si， Mn：0.1〜2.0％，Ni：0.1〜3.0％，Cr：11.0〜16.0％，N：0.01〜0.15％，Mo：0.01〜3.0％ 含有0.001〜0.005％的B和/或0.05〜0.5％的Ti，0.05〜0.5％的Nb和0.05〜0.5％的W中的一种或多种; 在材料的中心部分具有少于10％的铁素体; 并且具有从最外表面到至少1μm的深度的表层中的马氏体和3〜30％的奥氏体的混合结构体及其制造方法。

公开(公告)号：US5433798A

公开(公告)日：1995-07-18

申请号：US179804

申请日：1994-01-11

申请人： Koji Takano ,  Mizuo Sakakibara ,  Satoshi Araki ,  Takayoshi Matsui ,  Wataru Murata ,  Koichi Yoshimura

发明人： Koji Takano ,  Mizuo Sakakibara ,  Satoshi Araki ,  Takayoshi Matsui ,  Wataru Murata ,  Koichi Yoshimura

IPC分类号： C22C38/00 ,  C22C38/44 ,  C21D8/06

CPC分类号： C22C38/44 ,  C22C38/001

摘要： High strength martensitic stainless steel having high rusting resistance which comprises, by weight, 0.13 to 0.20% of C, 0.5 or less of Si, 2.0% or less of Mn, 1.0 to 2.5% of Ni, 12.0 to 16.0% of Cr, 1.3 to 3.5% of Mo, 0.06 to 0.13% of N, if necessary, 0.001 to 0.010% of B, or 0.05 to 1.0% of Ti, 0.05 to 1.0% of Nb, which satisfies 16 to 21% of ARI value for a rusting resistance index (Formula (1)), less than 0% of DI value for a .delta.-ferrite content index (Formula (2)), less than 0% of MI value for martensite content index (Formula (3)), less than 260% of W.sub.1 or W.sub.2 value for a cold workability index (Formulas (4) or (5)), with the balance comprising substantially Fe and inevitable impurities, said steel being characterized in that the martensite structure or the tempered martensite structure is contained, in which a Cr carbide of 0.2 .mu.m or less in grain size is deposited, especially enabling to produce a self drilling-tapping screw superior in screwing ability and rusting resistance, a nail superior in driving ability and rusting resistance, a cutter having high rusting resistance, a high strength spring superior in rusting resistance, etc.ARI=Cr+ 2.4Mo Formula (1)DI=Cr+ 1.21Mo+ 0.48Si+ 2.48Al- (24.5C+ 18.4N+Ni+ 0.11Mn)- 10.0 Formula (2)MI=Ni+ 30C+ 0.12Mn+ 18N+ 0.83(Cr+ 1.5Si+ 1.4Mo)- 25.0 Formula (3)W.sub.1= 24Mo+ 13.3Cr+ 6Mn+ 6Si+Ni Formula (4)W.sub.2 = 24Mo+ 13.3Cr+ 6Mn+ 6Si+Ni+10+ 10Nb Formula (5).

摘要翻译： 具有高耐锈性的高强度马氏体不锈钢，其含量为C：0.13〜0.20％，Si为0.5以下，Mn为2.0％以下，Ni为1.0〜2.5％，Cr为12.0〜16.0％，1.3 至3.5％的Mo，0.06〜0.13％的N，如果需要，0.001〜0.010％的B，或0.05〜1.0％的Ti，0.05〜1.0％的Nb，其生锈的ARI值为16〜21％ 电阻指数（式（1））小于δ-铁素体含量指数（式（2））的DI值的0％，小于马氏体含量指数（式（3））的MI值的0％，小于 冷加工性指数（式（4）或（5））的W1或W2值的260％，余量基本上由Fe和不可避免的杂质构成，所述钢的特征在于，含有马氏体组织或回火马氏体组织， 其中沉积了0.2μm或更小的Cr碳化物，特别是能够生产具有优良的螺旋力和生锈电阻的自钻螺丝钉 e，具有优越的驾驶能力和防锈性的指甲，具有高耐锈性的切割器，抗锈蚀性优异的高强度弹簧等。ARI = Cr + 2.4Mo式（1）DI = Cr + 1.21Mo + 0.48Si + 2.48Al-（ 24.5C + 18.4N + Ni + 0.11Mn） - 10.0式（2）MI = Ni + 30C + 0.12Mn + 18N + 0.83（Cr + 1.5Si + 1.4Mo）-25.0式（3）W1 = 24Mo + 13.3Cr + 6Mn + 6Si + Ni式（4）W2 = 24Mo + 13.3Cr + 6Mn + 6Si + Ni + 10 + 10Nb式（5）。

公开(公告)号：USD673961S1

公开(公告)日：2013-01-08

申请号：US29425278

申请日：2012-06-21

申请人： Takayoshi Matsui ,  Kazuhiko Koriyama

设计人： Takayoshi Matsui ,  Kazuhiko Koriyama

公开(公告)号：USD641050S1

公开(公告)日：2011-07-05

申请号：US29380748

申请日：2010-12-10

申请人： Takayoshi Matsui ,  Hideaki Kamata

设计人： Takayoshi Matsui ,  Hideaki Kamata