公开(公告)号：US06605166B2

公开(公告)日：2003-08-12

申请号：US09926715

申请日：2001-12-06

申请人： Seiichi Koike ,  Mitsuo Takashima ,  Katsuhiro Tsukiyama ,  Yuichi Namimura ,  Nobuhiko Ibaraki

发明人： Seiichi Koike ,  Mitsuo Takashima ,  Katsuhiro Tsukiyama ,  Yuichi Namimura ,  Nobuhiko Ibaraki

IPC分类号： C21D800

CPC分类号： C22C38/04 ,  C21D8/06 ,  C21D9/0093 ,  C21D2211/009 ,  C22C38/001 ,  C22C38/06

摘要： A high-strength bolt having excellent delayed fracture resistance and stress relaxation resistance in addition to a tensile strength of 1200 N/mm2 or higher is disclosed. A steel material for the high-strength bolt includes C: 0.50 to 1.0% by mass (hereinafter, referred to simply as “%”), Si: 0.5% or less (not including 0%), Mn: 0.2 to 1%, P: 0.03% or less (including 0%) and S: 0.03% or less (including 0%). The steel material has pro-eutectoid ferrite, pro-eutectoid cementite, bainite and martensite structures at less than 20% in total and a pearlite structure as the remainder. The high-strength bolt is produced by drawing the steel material severely to obtain a steel wire, forming the steel wire into a bolt shape through a cold heading, and subjecting the shaped steel wire to a blueing treatment at a temperature within a range of 100 to 400° C.

摘要翻译： 公开了除了抗拉强度为1200N / mm 2以上的高强度螺栓，其具有优异的耐延迟断裂性和耐应力松弛性。 用于高强度螺栓的钢材包括C：0.50〜1.0质量％（以下简称为“％”），Si：0.5％以下（不含0％），Mn：0.2〜1％ P：0.03％以下（包括0％）和S：0.03％以下（含0％）。 钢材的共析铁素体，共析共晶体，贝氏体和马氏体组织总共低于20％，其余为珠光体组织。 高强度螺栓是通过严格地拉伸钢材来获得钢丝，通过冷镦将钢丝形成螺栓形状，并且在100度范围内的温度下对成形钢丝进行蓝色处理 至400℃

公开(公告)号：US20070187003A1

公开(公告)日：2007-08-16

申请号：US10591475

申请日：2005-03-01

申请人： Mitsuo Takashima ,  Kentaro Takada ,  Zenji Iida ,  Katsuhiro Tsukiyama ,  Takehiko Egawa ,  Yuichi Namimura ,  Nobuhiko Ibaraki

发明人： Mitsuo Takashima ,  Kentaro Takada ,  Zenji Iida ,  Katsuhiro Tsukiyama ,  Takehiko Egawa ,  Yuichi Namimura ,  Nobuhiko Ibaraki

IPC分类号： C22C38/00

CPC分类号： C22C38/02 ,  C22C38/04 ,  C22C38/18 ,  F16B35/00

摘要： Disclosed is a high-strength bolt having a tensile strength of 1,200 N/mm2 or more and superior in delayed fracture resistance and relaxation resistance, prepared by wire-drawing a bolt steel containing the following elements: C: 0.5 to 1.0% (mass %, the same shall apply hereinafter), Si: 0.55 to 3%, Mn: 0.2 to 2%, P: 0.03% or less (but not 0%), S: 0.03% or less (but not 0%), and Al: 0.3% or less (but not 0%), and containing proeutectoid ferrite, proeutectoid cementite, bainite and martensite at a total areal rate of less than 20% and pearlite in balance; cold-heading the wire into a bolt shape; and then bluing the bolt in a temperature range of 100 to 500° C.

摘要翻译： 公开了通过拉拔含有以下元素的螺栓钢制备的拉伸强度为1200N / mm 2以上的耐久性和耐松弛性优异的高强度螺栓：C ：0.5〜1.0％（质量％，以下相同），Si：0.55〜3％，Mn：0.2〜2％，P：0.03％以下（但不为0％），S：0.03％以下 但不是0％），Al：0.3％以下（但不是0％），并且总共面积率小于20％的前共析铁素体，共析铁素体，贝氏体和马氏体，平衡的珠光体; 将钢丝冷拔成螺栓形状; 然后在100〜500℃的温度范围内使螺栓上蓝。

公开(公告)号：US07976258B2

公开(公告)日：2011-07-12

申请号：US11917412

申请日：2006-06-12

申请人： Tetsuya Asai ,  Yoshihiro Takitani ,  Katsuhiro Tsukiyama ,  Takehiko Egawa

发明人： Tetsuya Asai ,  Yoshihiro Takitani ,  Katsuhiro Tsukiyama ,  Takehiko Egawa

IPC分类号： F16B35/04

CPC分类号： C23C28/023 ,  C23C28/025 ,  C23C2222/10 ,  F16B33/06 ,  Y10S411/914

摘要： There is provided a screw treated by a chemical conversion coating of trivalent chromium having a torque characteristic approximately equivalent to a screw of a hexavalent chromate treatment. For the purpose, on a surface of a bolt, a zinc plating layer is formed by a zinc plating treatment. On the layer, a chemical conversion coating of trivalent chromium is also formed by a treatment of chemical conversion coatings of trivalent chromium. The coating is formed to be thin and soft so that the zinc-based plating layer can be exposed on the surface due to rubbing off of the chemical conversion coating of trivalent chromium at a contact portion to a fastened member of the bolt by tightening the bolt.

摘要翻译： 提供了通过具有与六价铬酸盐处理的螺杆大致相等的扭矩特性的三价铬的化学转化涂层处理的螺杆。 为此，在螺栓的表面上，通过镀锌处理形成镀锌层。 在该层上，通过处理三价铬的化学转化涂层也形成三价铬的化学转化涂层。 涂层形成为薄而柔软的，使得锌基镀层可以暴露在表面上，这是由于在接触部分将三价铬的化学转化涂层摩擦到螺栓的紧固构件，通过拧紧螺栓 。

公开(公告)号：US20090290953A1

公开(公告)日：2009-11-26

申请号：US11917412

申请日：2006-06-12

申请人： Tetsuya Asai ,  Yoshihiro Takitani ,  Katsuhiro Tsukiyama ,  Takehiko Egawa

发明人： Tetsuya Asai ,  Yoshihiro Takitani ,  Katsuhiro Tsukiyama ,  Takehiko Egawa

IPC分类号： F16B33/06

CPC分类号： C23C28/023 ,  C23C28/025 ,  C23C2222/10 ,  F16B33/06 ,  Y10S411/914

摘要： There is provided a screw treated by a chemical conversion coating of trivalent chromium having a torque characteristic approximately equivalent to a screw of a hexavalent chromate treatment. For the purpose, on a surface of a bolt, a zinc plating layer is formed by a zinc plating treatment. On the layer, a chemical conversion coating of trivalent chromium is also formed by a treatment of chemical conversion coatings of trivalent chromium. The coating is formed to be thin and soft so that the zinc-based plating layer can be exposed on the surface due to rubbing off of the chemical conversion coating of trivalent chromium at a contact portion to a fastened member of the bolt by tightening the bolt.

摘要翻译： 提供了通过具有与六价铬酸盐处理的螺杆大致相等的扭矩特性的三价铬的化学转化涂层处理的螺杆。 为此，在螺栓的表面上，通过镀锌处理形成镀锌层。 在该层上，通过处理三价铬的化学转化涂层也形成三价铬的化学转化涂层。 涂层形成为薄而柔软的，使得锌基镀层可以暴露在表面上，这是由于在接触部分将三价铬的化学转化涂层摩擦到螺栓的紧固构件，通过拧紧螺栓 。