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    PROCESS FOR PRODUCING SEAMLESS STAINLESS STEEL PIPE
    12.
    发明申请
    PROCESS FOR PRODUCING SEAMLESS STAINLESS STEEL PIPE 有权
    生产无缝不锈钢管的方法

    公开(公告)号：US20090084151A1

    公开(公告)日：2009-04-02

    申请号：US12258851

    申请日：2008-10-27

    申请人： Yasuyoshi Hidaka ,  Toshihide Ono ,  Satoshi Matsumoto ,  Kouji Nakaike ,  Sumio Iida

    发明人： Yasuyoshi Hidaka ,  Toshihide Ono ,  Satoshi Matsumoto ,  Kouji Nakaike ,  Sumio Iida

    IPC分类号： B21B19/04

    CPC分类号： B21B23/00 ,  B21B3/02 ,  B21B17/02 ,  B21B25/04 ,  B21B45/00 ,  B21B45/0269 ,  C21D3/04 ,  C21D9/08

    摘要： A process for producing seamless pipes which comprises conducting a piercing rolling step, a elongating rolling step using a mandrel bar, and a sizing rolling step and subsequently conducting a product heat treatment. In the process, when the carbon-equivalent weight, namely the sum of the weight of graphite in the lubricant and the carbon content in the organic binder, per unit area of the lubricant adhering to the mandrel bar surface in the above-mentioned step of elongating rolling is expressed by C (g/m2) or the maximum extent of carburization in the inner surface of the pipe to be heat-treated but prior to the heat treatment is expressed by ΔC (% by mass), the heating temperature for the pipe to be heat-treated is expressed by T (° C.), and the time during which a decarburizing gas is blown into the inside of the pipe to be heat-treated is expressed by t1 or t2 (seconds), and further, the blowing time calculated taking into account the wall thickness reduction in the step of cold working is expressed by t3 or t4 (seconds), a predetermined relation is satisfied and the actual decarburizing gas blowing time in the heat treatment is longer than the time t1, t2, t3 or t4 (seconds), whereby seamless stainless steel pipes reduced in carburized layer formation can be produced even when the carbon adhesion to the pipe inner surface is caused in, for example, mandrel mill rolling.

    摘要翻译： 一种生产无缝管的方法，包括进行穿孔轧制步骤，使用芯棒的拉伸轧制步骤和施胶轧制步骤，随后进行产品热处理。 在该过程中，当上述步骤中碳当量重量即润滑剂中的石墨重量与有机粘合剂中的碳含量的总和相对于在芯棒表面附着的润滑剂的单位面积时， 拉伸轧制由C（g / m 2）表示，或被热处理的管内表面的最大渗碳量表示为热处理之前的ΔC（质量％），加热温度为 待热处理的管道由T（℃）表示，并且将脱碳气体吹入待热处理管内的时间由t1或t2（秒）表示，此外， 考虑到冷加工步骤中的壁厚减少而计算的吹送时间由t3或t4（秒）表示，满足预定关系，并且热处理中的实际脱碳气体吹送时间长于时间t1， t2，t3或t4（秒），由此海 即使当在例如芯棒式无缝管轧机轧制中引起对内表面的碳附着时，也可以生产减少渗碳层形成的无尘不锈钢管。

    PROCESS FOR PRODUCING STAINLESS STEEL PIPE
    14.
    发明申请
    PROCESS FOR PRODUCING STAINLESS STEEL PIPE 有权
    生产不锈钢管的工艺

    公开(公告)号：US20090064749A1

    公开(公告)日：2009-03-12

    申请号：US12247923

    申请日：2008-10-08

    申请人： YASUYOSHI HIDAKA ,  Satoshi Matsumoto ,  Toshihide Ono ,  Kouji Nakaike ,  Sumio Iida ,  Hiroshi Nogami

    发明人： YASUYOSHI HIDAKA ,  Satoshi Matsumoto ,  Toshihide Ono ,  Kouji Nakaike ,  Sumio Iida ,  Hiroshi Nogami

    IPC分类号： B21B17/10

    CPC分类号： B21B23/00 ,  B21B3/02 ,  B21B17/10 ,  B21B17/14 ,  B21B19/04 ,  B21B25/04 ,  B21B45/004 ,  C21D1/76 ,  C21D1/767 ,  C21D3/04 ,  C21D8/10 ,  C21D9/08 ,  C22C38/02 ,  C22C38/44 ,  C22C38/58

    摘要： A process for stainless-steel pipe production which comprises piercing rolling a raw material stainless steel containing, by mass, Cr: 10-30%, to give a hollow shell, elongating rolling the hollow shell using a mandrel bar, together with a graphite-free lubricant, to give a finishing rolling blank pipe and heating the blank pipe in a reheating furnace and subjecting the same to finishing rolling by sizing rolling to produce a hot-finished pipe, and then subjecting this pipe as a mother pipe to cold working to produce a stainless-steel pipe. In the reheating furnace, the finishing rolling blank pipe is heated to 1000° C. or more and subjected to heating in which an oxidizing gas is blown into the pipe inside, whereby a stainless-steel pipe which is inhibited from forming a carburized layer in the pipe inner surface can be produced. When the finishing rolling by sizing rolling to give a cold working mother pipe is carried out by stretch reducer rolling at 860-1050° C., an annealing heat treatment of the mother pipe for cold working can be omitted. Thus, a stainless-steel pipe having excellent surface quality can be efficiently produced.

    摘要翻译： 一种不锈钢管制造方法，其特征在于，将包含Cr：10〜30％的原料不锈钢进行穿孔轧制，得到中空壳，使用芯棒将中空壳拉伸，并与石墨 无需润滑剂，得到精轧坯管，再加热炉内的坯管加热，通过定径轧制进行精轧，制成热轧管，然后将该管作为母管进行冷加工 生产不锈钢管。 在再热炉中，将精轧坯管加热至1000℃以上，进行向内部吹入氧化气体的加热，由此抑制渗碳层形成的不锈钢管 可以制造管内表面。 当通过在860-1050℃下的拉伸减速机轧制进行通过定径轧制得到冷加工母管的精轧时，可以省略用于冷加工的母管的退火热处理。 因此，可以有效地制造具有优异表面质量的不锈钢管。

    Process for producing seamless stainless steel pipe
    19.
    发明授权
    Process for producing seamless stainless steel pipe 有权
    生产无缝不锈钢管的工艺

    公开(公告)号：US08307688B2

    公开(公告)日：2012-11-13

    申请号：US12258851

    申请日：2008-10-27

    申请人： Yasuyoshi Hidaka ,  Toshihide Ono ,  Satoshi Matsumoto ,  Kouji Nakaike ,  Sumio Iida

    发明人： Yasuyoshi Hidaka ,  Toshihide Ono ,  Satoshi Matsumoto ,  Kouji Nakaike ,  Sumio Iida

    IPC分类号： B21B19/04 ,  B21B17/04

    CPC分类号： B21B23/00 ,  B21B3/02 ,  B21B17/02 ,  B21B25/04 ,  B21B45/00 ,  B21B45/0269 ,  C21D3/04 ,  C21D9/08

    摘要： A process for producing seamless pipes which comprises conducting a piercing rolling step, a elongating rolling step using a mandrel bar, and a sizing rolling step and subsequently conducting a product heat treatment. In the process, when the carbon-equivalent weight, namely the sum of the weight of graphite in the lubricant and the carbon content in the organic binder, per unit area of the lubricant adhering to the mandrel bar surface in the above-mentioned step of elongating rolling is expressed by C (g/m2) or the maximum extent of carburization in the inner surface of the pipe to be heat-treated but prior to the heat treatment is expressed by ΔC (% by mass), the heating temperature for the pipe to be heat-treated is expressed by T (° C.), and the time during which a decarburizing gas is blown into the inside of the pipe to be heat-treated is expressed by t1 or t2 (seconds), and further, the blowing time calculated taking into account the wall thickness reduction in the step of cold working is expressed by t3 or t4 (seconds), a predetermined relation is satisfied and the actual decarburizing gas blowing time in the heat treatment is longer than the time t1, t2, t3 or t4 (seconds), whereby seamless stainless steel pipes reduced in carburized layer formation can be produced even when the carbon adhesion to the pipe inner surface is caused in, for example, mandrel mill rolling.

    摘要翻译： 一种生产无缝管的方法，包括进行穿孔轧制步骤，使用芯棒的拉伸轧制步骤和施胶轧制步骤，随后进行产品热处理。 在该过程中，当上述步骤中碳当量重量即润滑剂中的石墨重量与有机粘合剂中的碳含量的总和相对于在芯棒表面附着的润滑剂的单位面积时， 拉伸轧制由C（g / m 2）表示，或被热处理的管内表面的最大渗碳程度，但是在热处理之前用＆Dgr; C（质量％）表示，加热温度 对于待热处理的管道由T（℃）表示，并且将脱碳气体吹入待热处理管内部的时间由t1或t2（秒）表示，并且 此外，考虑到冷加工步骤中的壁厚减少而计算的吹送时间由t3或t4（秒）表示，满足预定关系，并且热处理中的实际脱碳气体吹送时间长于时间 t1，t2，t3或t4（秒），由此海 即使当在例如芯棒式无缝管轧机轧制中引起对内表面的碳附着时，也可以生产减少渗碳层形成的无尘不锈钢管。

    Plug, Piercing-Rolling Mill, and Method of Producing Seamless Tube by Using the Same
    20.
    发明申请
    Plug, Piercing-Rolling Mill, and Method of Producing Seamless Tube by Using the Same 有权
    插头，穿孔机，以及使用其生产无缝管的方法

    公开(公告)号：US20120210761A1

    公开(公告)日：2012-08-23

    申请号：US13212929

    申请日：2011-08-18

    申请人： Yasuto Higashida ,  Yasuyoshi Hidaka ,  Kazuhiro Shimoda ,  Tomio Yamakawa

    发明人： Yasuto Higashida ,  Yasuyoshi Hidaka ,  Kazuhiro Shimoda ,  Tomio Yamakawa

    IPC分类号： B21B45/02 ,  B21B19/04

    CPC分类号： B21B25/00 ,  B21B19/04 ,  B21B25/04

    摘要： A plug includes a front edge portion having a convex curvature; a cylindrical portion having a truly or nearly cylindrical shape; a trunk portion having an outer diameter gradually increasing toward a rear edge thereof; a mandrel joint provided in a rear edge portion of the plug; a lubricant ejection hole running through the trunk portion from the mandrel joint that opens on the surface of the cylindrical portion; and a coating comprising oxides and Fe that is formed on the base metal surface of each of the front edge portion as well as the trunk portion by arc spraying using an iron wire. In this way, the plug can prevent inner surface flaws from occurring in a hollow blank that is deformed by piercing-rolling, and can extend its life without requiring a long time for making it.

    摘要翻译： 塞子包括具有凸曲率的前边缘部分; 具有真正或近似圆柱形形状的圆柱形部分; 躯干部分的外径朝向其后缘逐渐增加; 设置在所述插头的后端部的心轴接头; 润滑剂喷射孔，其从所述心轴接头穿过所述躯干部分，所述心轴接头在所述圆筒部分的表面上开口; 以及通过使用铁丝的电弧喷涂而形成在前边缘部分和后端部的基底金属表面上的氧化物和Fe的涂层。 以这种方式，塞子可以防止在通过穿孔轧制变形的中空坯件中发生内表面缺陷，并且可以延长其使用寿命而不需要很长时间来制造它。