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    High-strength steel excellent in low temperature toughness and toughness at weld heat-affected zone, mehtod for producing the same, and method for producing high-strength steel pipe
    11.
    发明申请
    High-strength steel excellent in low temperature toughness and toughness at weld heat-affected zone, mehtod for producing the same, and method for producing high-strength steel pipe 有权
    焊接热影响区的低温韧性，韧性优异的高强度钢，制造高强度钢管的方法

    公开(公告)号：US20040031544A1

    公开(公告)日：2004-02-19

    申请号：US10444743

    申请日：2003-05-23

    发明人： Takuya Hara ,  Hitoshi Asahi

    IPC分类号： C21D009/08

    CPC分类号： C22C38/02 ,  C21D8/0226 ,  C21D8/10 ,  C21D8/1261 ,  C21D2211/002 ,  C21D2211/008 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/58 ,  Y10S148/909

    摘要： A high-strength steel pipe excellent in weldability on site and a method for producing the steel pipe by improving the reliability of the low temperature toughness of a steel are provided. For example, the steel pipe includes elements to enhance hardenability for furthering high-strengthening and also improving toughness at a weld heat affected zone subjected to double or more layer welding. In the method, the steel is made to consist of a structure composed of bainite and/or martensite by containing prescribed amounts of C, Si, Mn, P, S, Ni, Mo, Nb, Ti, Al and N, and, as occasion demands, one or more of B, V, Cu, Cr, Ca, REM, and Mg, and regulating C, Si, Mn, Cr, Ni, Cu, V and Mo. Such elements enhancing hardenability, by a specific relational expression. The diameter of prior austenite grains may be regulated in a prescribed range. The method may include heating a casting to a temperature not lower than the Ac3 point, hot rolling such casting, and thereafter cooling the resulting hot-rolled steel plate at a prescribed cooling rate.

    摘要翻译： 提供了一种现场焊接性优异的高强度钢管和通过提高钢的低温韧性的可靠性来制造钢管的方法。 例如，钢管包括提高淬火性的元素，以进一步提高强化强度，并提高经受双层或多层焊接的焊接热影响区的韧性。 在该方法中，通过含有规定量的C，Si，Mn，P，S，Ni，Mo，Nb，Ti，Al和N，由贝氏体和/或马氏体构成的结构，由钢构成，作为 需要B，V，Cu，Cr，Ca，REM和Mg中的一种或多种，​​调节C，Si，Mn，Cr，Ni，Cu，V和Mo。这些元素通过具体的关系式提高淬透性 。 原奥氏体晶粒的直径可以在规定的范围内调节。 该方法可以包括将铸件加热到不低于Ac3点的温度，热轧这种铸造，然后以规定的冷却速度冷却所得到的热轧钢板。

    Martensitic stainless steel welded pipe
    13.
    发明授权
    Martensitic stainless steel welded pipe 有权
    马氏体不锈钢焊管

    公开(公告)号：US06379821B2

    公开(公告)日：2002-04-30

    申请号：US09822233

    申请日：2001-04-02

    申请人： Takahiro Kushida ,  Tomohiko Omura ,  Kunio Kondo ,  Kazuhiro Ogawa ,  Masahiko Hamada

    发明人： Takahiro Kushida ,  Tomohiko Omura ,  Kunio Kondo ,  Kazuhiro Ogawa ,  Masahiko Hamada

    IPC分类号： B32B1518

    CPC分类号： B23K9/23 ,  B23K9/0253 ,  B23K35/308 ,  B23K35/3086 ,  B23K2101/06 ,  C22C38/002 ,  C22C38/004 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/50 ,  Y10S148/909 ,  Y10T428/12958 ,  Y10T428/12979 ,  Y10T428/12986

    摘要： This invention relates to a large-diameter, thick-wall martensitic stainless steel welded pipe. For this welded pipe, the size of the raised weld bead portion on the inside surface is restricted to be small based on a conditional formula derived by considering the bead width and height and the yield strength of the base metal and of the weld metal. As a result, the base metal portion and pipe inside surface seam portion of this welded pipe are superior in corrosion resistance, in particular stress corrosion cracking resistance (SCC resistance). The sulfide stress corrosion resistance (sour gas resistance) and carbon dioxide corrosion resistance can be further improved by selecting the chemical compositions. This welded pipe is very well suited for use as a pipe for a pipeline for conveying a crude oil and a natural gas with no dehydration treatment, which is highly corrosive to metals.

    摘要翻译： 本发明涉及一种大直径，厚壁的马氏体不锈钢焊管。 对于该焊接管，基于通过考虑焊道宽度和高度以及基体金属和焊接金属的屈服强度导出的条件公式将内表面上的凸起焊道部分的尺寸限制为小。 结果，该焊接管的贱金属部分和管内表面接缝部分具有优异的耐腐蚀性，特别是耐应力腐蚀开裂性（SCC电阻）。 通过选择化学成分可以进一步提高耐硫化物应力腐蚀性（耐酸性气体阻力）和二氧化碳耐腐蚀性。 该焊接管非常适用于输送原油和无脱水处理的天然气管道的管道，该管道对金属具有高度的腐蚀性。

    Laser-welded steel pipe and method therefor
    14.
    发明授权
    Laser-welded steel pipe and method therefor 有权
    激光焊接钢管及其方法

    公开(公告)号：US6140601A

    公开(公告)日：2000-10-31

    申请号：US340355

    申请日：1999-06-28

    申请人： Moriaki Ono ,  Tsuyoshi Shiozaki ,  Masanori Ohmura ,  Yutaka Nagahama ,  Akio Sato ,  Kenichi Iwazaki ,  Yukio Sekine

    发明人： Moriaki Ono ,  Tsuyoshi Shiozaki ,  Masanori Ohmura ,  Yutaka Nagahama ,  Akio Sato ,  Kenichi Iwazaki ,  Yukio Sekine

    IPC分类号： B21C37/08 ,  B23K26/26 ,  B23K26/32 ,  B23K26/00 ,  C22C38/18

    CPC分类号： B21C37/08 ,  B23K26/262 ,  B23K26/32 ,  B23K2201/06 ,  B23K2203/04 ,  B23K2203/05 ,  B23K2203/50 ,  Y10S148/909

    摘要： A laser welded steel pipe having a weld zone containing a steel pipe containing 0.01 to 0.2 weight % C, 1 weight % or less S, 0.05 to 2 weight % Mn and 6 weight % or less Mn. The weld zone has a melted and solidified metal structure containing carbon and oxygen which satisfy the following equations:(carbon weight %)(oxygen weight %).ltoreq.0.006for a steel pipe containing carbon in an amount of less than 0.2 weight %, and(oxygen weight %).gtoreq.0.02.A method for manufacturing a laser-welded steel pipe including producing an open pipe made from a hot-rolled steel strip with opposing edge portions facing each other by employing a formal roll, preheating the two edge portions, pressing the two edge portions to butt against each other by using squeeze rolls and welding the butted edge portions by irradiation with a laser beam to heat and melt the two edge portions.

    摘要翻译： 一种具有含有钢管的焊接区域的激光焊接钢管，其含有0.01〜0.2重量％的C，1重量％以下的S，0.05〜2重量％的Mn和6重量％以下的Mn。 焊接区域具有含碳和氧的熔融和固化的金属结构，其满足以下等式：对于含有小于0.2重量％的碳的钢管，（碳重量％）（氧重量％）<0.00 = 和（氧重量％）> / = 0.02。一种激光焊接钢管的制造方法，其特征在于，包括：制造由热轧钢带制成的开口管，所述开口管具有相对的边缘部分，通过使用正式辊彼此面对，预热所述两个 边缘部分，通过使用挤压辊挤压两个边缘部分彼此对接并且通过用激光束照射焊接对接边缘部分以加热和熔化两个边缘部分。

    Linepipe and structural steel produced by high speed continuous casting
    15.
    发明授权
    Linepipe and structural steel produced by high speed continuous casting 失效
    高速连铸生产的管线和结构钢

    公开(公告)号：US5993570A

    公开(公告)日：1999-11-30

    申请号：US879331

    申请日：1997-06-20

    申请人： John Malcolm Gray

    发明人： John Malcolm Gray

    IPC分类号： C22C38/00 ,  C22C38/12 ,  C22C38/14 ,  C22C38/04

    CPC分类号： C22C38/001 ,  C22C38/12 ,  C22C38/14 ,  Y10S148/909

    摘要： A high strength, high toughness, low carbon/low manganese steel is provided that is further resistant to stepwise cracking and sulfide stress cracking. The steel can be produced by conventional or thin slab casting techniques using normal speeds, with low manganese segregation levels. The steels are excellent candidates for linepipe applications in severe sour gas service.

    摘要翻译： 提供了高强度，高韧性，低碳/低锰钢，其进一步抵抗逐步裂化和硫化物应力开裂。 钢可以通过常规或薄板坯铸造技术使用正常速度，具有低锰分离水平来生产。 这种钢是用于严重酸性气体服务中的管线应用的优秀候选人。

    Manufacturing a steel tube including tufftriding
    20.
    发明授权
    Manufacturing a steel tube including tufftriding 失效
    制造钢管，包括净化

    公开(公告)号：US4495003A

    公开(公告)日：1985-01-22

    申请号：US456982

    申请日：1983-01-10

    申请人： Naomi Kubo

    发明人： Naomi Kubo

    IPC分类号： C23C8/00 ,  C23C8/48 ,  C23C8/50 ,  C23C8/54 ,  C23C8/80 ,  F02B3/06 ,  F02M55/02 ,  F16L9/02 ,  B32B15/00

    CPC分类号： C23C8/80 ,  C23C8/00 ,  C23C8/48 ,  C23C8/50 ,  F02M55/02 ,  F16L9/02 ,  F02B3/06 ,  Y10S148/909

    摘要： A steel tube having a small outside diameter and a large wall thickness, for use, for example, as a high pressure fuel injection pipe for a diesel engine, has a hardened layer on at least its internal surface. The hardened layer is formed by a diffusion layer which comprises a solid solution of nitrogen formed by tufftriding, and which is completely free from any intermetallic compounds, i.e. Fe.sub.3 N and Fe.sub.4 N. A method of manufacturing such a tube is also disclosed, and comprises tufftriding a steel tube in a molten bath of sodium cyanide while it is being axially vibrated, to form the diffusion layer, and heat treating the tube in a gaseous atmosphere to decompose any intermetallic compound on the diffusion layer.

    摘要翻译： 例如，用作柴油发动机的高压燃料喷射管的具有小外径和大壁厚的钢管在至少其内表面上具有硬化层。 硬化层由扩散层形成，该扩散层包括通过浮选形成的氮的固溶体，并且完全不含任何金属间化合物，即Fe 3 N和Fe 4 N。 还公开了制造这种管的方法，并且包括将钢管在氰化钠的熔融浴中进行轴向振动的同时，以形成扩散层，并在气体气氛中热处理管以分解任何金属间化合物 化合物在扩散层上。