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1.发明申请PROCESS FOR MANUFACTURING SEAMLESS STEEL PIPE, HOLLOW SPRING UTILIZING SEAMLESS STEEL PIPE 审中-公开制造无缝钢管的方法，使用无缝钢管的中空弹簧公开(公告)号：US20130239637A1
公开(公告)日：2013-09-19
申请号：US13892009
申请日：2013-05-10
IPC分类号： B21B19/04
CPC分类号： B21B19/04 , B21B1/42 , B21C23/007 , B21C23/08 , B21C23/085 , B21F3/02 , C21D9/08 , C22C38/04 , C22C38/34 , C22C38/46 , F16F1/04 , F16F1/042 , F16F1/06 , F16F1/18
摘要： There are provided: a seamless steel pipe formed from a cylindrical steel material billet through a hot isostatic extrusion step, wherein a depth of a contiguous flaw formed on an inner periphery surface and an outer periphery surface of the steel pipe is 50 μm or less; a hollow spring obtained by forming a hollow body in a shape of a coil or a bar or a bar with curved part from the seamless steel pipe made of spring steel and applying a surface treatment to the hollow body so that the hollow body has compressive residual stress; and a method for producing seamless steel pipe including: a billet molding step; a first heating step; a hot isostatic extrusion step; a second heating step; an extension step; a third heating step; and a pickling step.
摘要翻译： 提供了一种通过热等静压挤出步骤由圆柱形钢材坯料形成的无缝钢管，其中在钢管的内周表面和外周表面上形成的邻接缺陷的深度为50μm以下; 通过从由弹簧钢制成的无缝钢管形成具有弯曲部的线圈或棒或棒的中空体的空心弹簧，并对中空体进行表面处理，使得中空体具有压缩残余 强调; 以及生产无缝钢管的方法，包括：坯料成型步骤; 第一加热步骤; 热等静压挤压步骤; 第二加热步骤; 延伸步骤 第三加热步骤; 和酸洗步骤。
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2.发明申请PROCESS FOR MANUFACTURING SEAMLESS STEEL PIPE, HOLLOW SPRING UTILIZING SEAMLESS STEEL PIPE 审中-公开制造无缝钢管的方法，使用无缝钢管的中空弹簧公开(公告)号：US20170001226A1
公开(公告)日：2017-01-05
申请号：US15268268
申请日：2016-09-16
CPC分类号： B21B19/04 , B21B1/42 , B21C23/007 , B21C23/08 , B21C23/085 , B21F3/02 , C21D9/08 , C22C38/04 , C22C38/34 , C22C38/46 , F16F1/04 , F16F1/042 , F16F1/06 , F16F1/18
摘要： There are provided: a seamless steel pipe formed from a cylindrical steel material billet through a hot isostatic extrusion step, wherein a depth of a contiguous flaw formed on an inner periphery surface and an outer periphery surface of the steel pipe is 50 μm or less; a hollow spring obtained by forming a hollow body in a shape of a coil or a bar or a bar with curved part from the seamless steel pipe made of spring steel and applying a surface treatment to the hollow body so that the hollow body has compressive residual stress; and a method for producing seamless steel pipe including: a billet molding step; a first heating step; a hot isostatic extrusion step; a second heating step; an extension step; a third heating step; and a pickling step.
摘要翻译： 提供了一种通过热等静压挤出步骤由圆柱形钢材坯料形成的无缝钢管，其中形成在钢管的内周面和外周面上的相邻缺口的深度为50μm以下; 通过从由弹簧钢制成的无缝钢管形成具有弯曲部的线圈或棒或棒的中空体的空心弹簧，并对中空体进行表面处理，使得中空体具有压缩残余 强调; 以及生产无缝钢管的方法，包括：坯料成型步骤; 第一加热步骤; 热等静压挤压步骤; 第二加热步骤; 延伸步骤 第三加热步骤; 和酸洗步骤。
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公开(公告)号：US20140346721A1
公开(公告)日：2014-11-27
申请号：US14453747
申请日：2014-08-07
CPC分类号： B21B19/04 , B21B1/42 , B21C23/007 , B21C23/08 , B21C23/085 , B21F3/02 , C21D9/08 , C22C38/04 , C22C38/34 , C22C38/46 , F16F1/04 , F16F1/042 , F16F1/06 , F16F1/18
摘要： There are provided: a seamless steel pipe formed from a cylindrical steel material billet through a hot isostatic extrusion step, wherein a depth of a contiguous flaw formed on an inner periphery surface and an outer periphery surface of the steel pipe is 50 nm or less; a hollow spring obtained by forming a hollow body in a shape of a coil or a bar or a bar with curved part from the seamless steel pipe made of spring steel and applying a surface treatment to the hollow body so that the hollow body has compressive residual stress; and a method for producing seamless steel pipe including: a billet molding step; a first heating step; a hot isostatic extrusion step; a second heating step; an extension step; a third heating step; and a pickling step.
摘要翻译： 提供了一种通过热等静压挤出步骤由圆柱形钢材坯料形成的无缝钢管，其中形成在钢管的内周面和外周面上的连续缺口的深度为50nm以下; 通过从由弹簧钢制成的无缝钢管形成具有弯曲部的线圈或棒或棒的中空体的空心弹簧，并对中空体进行表面处理，使得中空体具有压缩残余 强调; 以及生产无缝钢管的方法，包括：坯料成型步骤; 第一加热步骤; 热等静压挤压步骤; 第二加热步骤; 延伸步骤 第三加热步骤; 和酸洗步骤。
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公开(公告)号：US20180265952A1
公开(公告)日：2018-09-20
申请号：US15541534
申请日：2016-01-05
发明人： Takuya KOCHI , Hitoshi HATANO , Kotaro TOYOTAKE
CPC分类号： C22C38/34 , C21D8/10 , C21D8/105 , C21D9/02 , C21D9/08 , C22C38/00 , C22C38/001 , C22C38/04 , C22C38/06 , C22C38/38 , C22C38/46 , C22C38/50 , C22C38/58 , F16F1/021 , F16F1/043
摘要： Provided is a hollow seamless steel pipe for a spring, including by mass %, C: 0.2 to 0.7%; Si: 0.5 to 3%; Mn: 0.1 to 2%; Cr: more than 0% and 3% or less; Al: more than 0% and 0.1% or less; P: more than 0% and 0.02% or less; S: more than 0% and 0.02% or less; and N: more than 0% and 0.02%: or less, with the balance being iron and inevitable impurities, wherein, an uneven thickness ratio calculated by formula (1) below is 7.0% or less. Uneven Thickness Ratio=(Maximum Thickness−Minimum Thickness)/(Average Thickness)/2×100 (1)
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