42.
    发明专利
    未知

    公开(公告)号:NO330265B1

    公开(公告)日:2011-03-14

    申请号:NO990824

    申请日:1999-02-22

    Abstract: The martensitic stainless steel product comprises a base steel and a dual oxide scale layer on a surface of the steel, wherein the dual scale layer includes an inner scale layer containing FeCr2O4 and Fe3O4 as main components and an outer scale layer containing Fe3O4 as a main component and having an outermost Fe2O3 layer; or includes an inner scale layer containing FeCr2O4 and FeO as main components and an outer scale layer containing FeO and Fe3O4 as main components and having an outermost Fe2O3 layer. If the product is a steel pipe, it exhibits excellent corrosion resistance when used for an oil country tubular goods or line pipe.

    FE-CR ALLOY BILLET AND METHOD FOR PRODUCTION THEREOF

    公开(公告)号:CA2525147C

    公开(公告)日:2009-08-18

    申请号:CA2525147

    申请日:2004-05-20

    Abstract: Fe-Cr alloy billet manufacturing method according to the present invention, since the blooming is carried out with the high reduction rate surface of the cast steel covered with a scale layer of a large area rate as 70 % or more and without the descaling applied, can reduce the indentation and inclusion of the scale. Thereby, in the case of a billet for use in seamless steel pipes being manufactured from a steel strip of a Fe-Cr alloy, surface treatment before tube-making can be largely reduced. Thereby, when the Fe-Cr alloy billet is adopted in manufacturing seamless steel pipes, since even the Fe-C r alloy steel pipe relatively hard to process can be manufactured at low manufacturing cost and efficiently, it can be widely applied in a field of manufacturing hot seamless steel pipes.

    MARTENSITIC STAINLESS STEEL PRODUCTS.

    公开(公告)号:MY120831A

    公开(公告)日:2005-11-30

    申请号:MYPI9905237

    申请日:1999-12-02

    Abstract: A MARTENSITIC STAINLESS STEEL PRODUCT HAVING A CHROMIUM CONTENT OF 9 TO 15% BY WEIGHT AND A SURFACE FROM WHICH MILL SCALES GENERATED DURING PRODUCTION ARE REMOVED BY A SHOT BLASTING. THE SURFACE SATISFIES THAT, WHEN A COLOR IMAGE OF THE SURFACE TAKEN WITH 640 X 480 PIXELS IS ANALYZED ON BLUE COLOR AND A HISTOGRAM OF THE PIXEL NUMBERS AND THE TONES DIVIDED INTO 0 TO 255 CLASSES IS OBTAINED, A RELATIONSHIP BETWEEN THE MAXIMUM FREQUENCY Y P AND THE TONE VALUE XP AT WHICH YP IS COUNTED SATISFIES AN INEQUALITY, 800XP- YP-27000 > O. THIS STEEL PRODUCT IS SUPERIOR IN WEATHERABILITY UNDER ATMOSPHERIC ENVIRONMENTS, AND ALSO SUPERIOR IN SULFIDE STRESS CRACKING RESISTANCE UNDER ENVIRONMENTS CONTAINING HYDRO-SULFIDE.

    47.
    发明专利
    未知

    公开(公告)号:NO996015L

    公开(公告)日:2000-06-09

    申请号:NO996015

    申请日:1999-12-07

    Abstract: A martensitic stainless steel product having a chromium content of 9 to 15 % by weight and a surface from which mill scales generated during production are removed by a shot blasting. The surface satisfies that, when a color image of the surface taken with 640 x 480 pixels is analyzed on blue color and a histogram of the pixel numbers and the tones divided into 0 to 255 classes is obtained, a relationship between the maximum frequency Yp and the tone value Xp at which Yp is counted satisfies an inequality, 800Xp - Yp - 27000 > 0. This steel product is superior in weatherability under atmospheric environments, and also superior in sulfide stress cracking resistance under environments containing hydra-sulfide.

    48.
    发明专利
    未知

    公开(公告)号:NO990824L

    公开(公告)日:1999-08-24

    申请号:NO990824

    申请日:1999-02-22

    Abstract: The martensitic stainless steel product comprises a base steel and a dual oxide scale layer on a surface of the steel, wherein the dual scale layer includes an inner scale layer containing FeCr2O4 and Fe3O4 as main components and an outer scale layer containing Fe3O4 as a main component and having an outermost Fe2O3 layer; or includes an inner scale layer containing FeCr2O4 and FeO as main components and an outer scale layer containing FeO and Fe3O4 as main components and having an outermost Fe2O3 layer. If the product is a steel pipe, it exhibits excellent corrosion resistance when used for an oil country tubular goods or line pipe.

    Mandrel bar cleaning facility
    50.
    发明专利
    Mandrel bar cleaning facility 有权
    MANDREL酒吧清洁设施

    公开(公告)号:JP2008049345A

    公开(公告)日:2008-03-06

    申请号:JP2006224812

    申请日:2006-08-22

    Abstract: PROBLEM TO BE SOLVED: To provide mandrel bar cleaning facility by which carburization caused on the inside surface of a tube during elongation is effectively restrained without hindering an operation.
    SOLUTION: This mandrel bar cleaning facility 15 cleans a mandrel bar B which is pulled out of a mandrel bar conveying line after being used for the elongation of a tube in a mandrel mill 8. The mandrel bar cleaning facility 15 is provided with: conveying devices 17, 18 for conveying the mandrel bar B in the axial direction while revolving the bar B in the peripheral direction; and a cleaning devices 1d which are arranged oppositely to the side parts of the mandrel bar B conveyed with the conveying devices 17, 18 and from which high-pressure water the water pressure of which is 0.2-150 MPa (preferably 20-150 MPa) is jetted toward the outside surface of the mandrel bar B.
    COPYRIGHT: (C)2008,JPO&INPIT

    Abstract translation: 要解决的问题:为了提供在延伸期间在管内表面引起渗碳而不妨碍操作的芯杆清洗设备。 解决方案:该芯棒清洁设备15清洁在用于在芯棒式无缝管轧机8中的管的伸长率之后从芯棒输送线拉出的芯棒B.芯棒清洁设备15设置有 :用于沿轴向传送芯棒B的输送装置17,18,同时沿圆周方向旋转条B; 以及与输送装置17,18输送的芯棒B的侧部相对配置的水压为0.2〜150MPa(优选为20〜150MPa)的高压水的清洗装置1d, 朝向芯棒B的外表面喷射。版权所有(C)2008,JPO&INPIT

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