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    METHOD OF ROLLING METALLIC PIPE WITH COLD PILGER ROLLING MILL
    6.
    发明专利
    METHOD OF ROLLING METALLIC PIPE WITH COLD PILGER ROLLING MILL 失效

    公开(公告)号：JPH11188409A

    公开(公告)日：1999-07-13

    申请号：JP35969897

    申请日：1997-12-26

    Applicant: SUMITOMO METAL IND

    Inventor： AISAKA SHINICHIRO ,  OGAWA HIDENORI

    IPC: B21B21/04 ,  B21C51/00

    Abstract: PROBLEM TO BE SOLVED: To roll a material roll with the feed volume set at maximum without causing excessive feeding of the material pipe by judging an occurrence of excessive feeding of the material pipe from the fluctuation pattern of axial length stress to work on a mandrel and changing the feed volume the material pipe on the basis of the judged result. SOLUTION: A strain gauge SG is attached to a mandrel 4 and axial length stress is continuously measured, amplified with an amplifier 10, and then input to a judging circuit 12. To a crank shaft 3, a turning angle detector PG is installed, and each time a roll stand 2 makes one reciprocating motion in the given required time, the pulse signal is outputted to a gate setter 11. The gate setter 11 outputs the gate signal which is synchronized with this pulse signal, and preset to the judging correct 12. The judging circuit 12 operates an alarm 13 only when the signal inputted from the amplifier 10 is lower than the preset threshold. If the alarm 13 is operated, an operator decreases the feed volume of a material pipe SP, and when the alarm is not operated, the operator gradually increases the feed volume.

    METHOD FOR BRIGHT-ANNEALING TWO-PHASE STAINLESS STEEL
    7.
    发明专利
    METHOD FOR BRIGHT-ANNEALING TWO-PHASE STAINLESS STEEL 失效

    公开(公告)号：JPH11100613A

    公开(公告)日：1999-04-13

    申请号：JP25965997

    申请日：1997-09-25

    Applicant: SUMITOMO METAL IND

    Inventor： OKADA KOICHI ,  OGAWA HIDENORI ,  YOSHINO TAKESHI

    IPC: C21D6/00 ,  C21D1/76

    Abstract: PROBLEM TO BE SOLVED: To obtain a two-phase stainless steel excellent in both of pitting corrosion resistance and stress corrosion cracking resistance without absorbing nitrogen or denitrification on a steel surface layer part at the time of annealing and having bright surface without surface coloring by controlling nitrogen concn. in the atmospheric gas at the time of bright-annealing within a specific range in accordance with the nitrogen content in the steel and controlling the dew point and the annealing temp. within the specific temp. ranges. SOLUTION: In the atmospheric gas composed of (9N-0.5)-(9N+0.5) vol.% nitrogen gas concn. and the balance hydrogen gas and having

    Method for manufacturing seamless tube
    8.
    发明专利
    Method for manufacturing seamless tube 有权
    制造无缝管的方法

    公开(公告)号：JP2003311317A

    公开(公告)日：2003-11-05

    申请号：JP2002115708

    申请日：2002-04-18

    Applicant: Sumitomo Metal Ind Ltd ,  住友金属工業株式会社

    Inventor： OGAWA HIDENORI

    IPC: B21B3/02 ,  B21B15/00 ,  B21B21/00 ,  B21B23/00 ,  B21B45/00 ,  B21B45/02 ,  B21C1/00 ,  B21C1/22 ,  B21C23/00 ,  B21C23/08 ,  B21C37/06 ,  B21C37/20 ,  C21D8/10

    CPC classification number: B21B21/00 ,  B21B3/02 ,  B21B45/004 ,  B21B2015/0028 ,  B21B2015/0078 ,  B21B2023/005 ,  B21B2045/0227 ,  B21C1/22 ,  B21C23/002 ,  B21C23/085 ,  B21C37/06 ,  B21C37/20 ,  C21D8/10 ,  C21D8/105

    Abstract: PROBLEM TO BE SOLVED: To prevent the crack of a material due to the low toughness of a tube stock and the break of a mandrel following the working of at tube with the grooved inside surface when performing the cold rolling using a hard-to-work tube stock.
    SOLUTION: By this manufacturing method of the seamless tube, after manufacturing the tube stock for the seamless tube is manufactured by a hot tube- making method from a hard-to-work material and cold-drawing the tube stock at the working ratio of ≥15%, heat treatment is performed and, after that, cold rolling is performed. It is preferable to manufacture the tube stock for the seamless tube by using hot extrusion as the hot manufacturing method of the tube. Furthermore, as the above hard-to-work material, alloy steel containing, by weight, ≥15% Cr and ≥20% Ni, or ferritic stainless steel containing ≥16% Cr is illustrated as an objective material. This manufacturing method can be adopted as the manufacturing method of the tube with the grooved inside surface.
    COPYRIGHT: (C)2004,JPO

    Abstract translation: 要解决的问题：为了防止由于管坯的低韧性导致的材料的裂纹以及当使用硬质合金进行冷轧时，在带槽的内表面的管的加工之后的心轴断裂， 工作管材。 解决方案：通过这种无缝管的制造方法，制造无缝管的管材后，通过热加工方法从难加工材料制造，并在工作时冷拉管材料 比率≥15％，进行热处理，之后进行冷轧。 优选通过使用热挤压作为管的热制造方法制造无缝管的管材。 此外，作为上述难加工材料，示出了含有≥15％Cr和≥20％Ni的合金钢，或含有≥16％Cr的铁素体不锈钢作为目标材料。 可以采用这种制造方法作为带槽内表面的管的制造方法。 版权所有（C）2004，JPO

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