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    OIL WELL PIPE JOINT
    1.
    发明专利
    OIL WELL PIPE JOINT 未知

    公开(公告)号：DE3569598D1

    公开(公告)日：1989-05-24

    申请号：DE3569598

    申请日：1985-03-26

    Applicant: SUMITOMO METAL IND

    Inventor： FUKUI KUNIHIRO ,  NISHIHARA MINORU ,  MASE TOSHIRO ,  MORITA YOSHIYASU ,  KAWASHIMA HISAKAZU

    IPC: E21B17/042 ,  F16L15/00 ,  F16L58/18

    Abstract: An oil well pipe joint comprising a metal-to-metal sealing portion without thread is disclosed. A metal-plated or resin-coated layer exhibiting improved resistance to galling is provided on the outer peripheral surface of a thread-free lip portion which constitutes part of the metal-to-metal sealing portion on an externally-threaded member. At the metal sealing portion, satisfactory sealing properties are maintained under severe corrosive conditions, enabling the joint to be connected and disconnected over 10 times, and usually over 25 times.

    OIL WELL PIPE JOINT
    2.
    发明专利
    OIL WELL PIPE JOINT 未知

    公开(公告)号：CA1238352A

    公开(公告)日：1988-06-21

    申请号：CA477362

    申请日：1985-03-25

    Applicant: SUMITOMO METAL IND

    Inventor： FUKUI KUNIHIRO ,  NISHIHARA MINORU ,  MASE TOSHIRO ,  MORITA YOSHIYASU ,  KAWASHIMA HISAKAZU

    IPC: E21B17/042 ,  F16L15/00 ,  F16L58/18 ,  F16L9/14

    Abstract: OIL WELL PIPE JOINT of the disclosure An oil well pipe joint comprising a metal-to-metal sealing portion without thread is disclosed. A metal-plated or resin-coated layer exhibiting improved resistance to galling is provided on the outer peripheral surface of a thread-free lip portion which constitutes part of the metal-to-metal sealing portion on an externally-threaded member. At the metal sealing portion, satisfactory sealing properties are maintained under severe corrosive conditions, enabling the joint to be connected and disconnected over 10 times, and usually over 25 times.

    LUBRICANT FOR HOT WORKING
    3.
    发明专利
    LUBRICANT FOR HOT WORKING 失效

    公开(公告)号：JPH02206693A

    公开(公告)日：1990-08-16

    申请号：JP2705589

    申请日：1989-02-06

    Applicant: SUMITOMO METAL IND

    Inventor： NAKAJIMA KAZUHIRO ,  MASE TOSHIRO

    IPC: B21B25/04 ,  C10M173/02 ,  C10N10/02 ,  C10N30/08 ,  C10N40/24

    Abstract: PURPOSE:To obtain the title lubricant which has excellent adhesion, sufficient heat resistance, high solubility in water and excellent lubricity by dispersing a lubricant composition containing a graphite powder, potassium borate and others in water. CONSTITUTION:The subject lubricant is obtained by dispersing a lubricant composition containing (A) 20 to 85wt.%, preferably 40 to 75wt.% of graphite, preferably of less than 30mum particle sizes, and (B) 15 to 80wt.%, preferably 80 to 70wt.% of a binder consisting of potassium borate and/or lithium borate in water so that the components (A) and (B) exceed 80wt.%, particularly 90wt.% in total. Less than 10wt.% of a dispersant is very effective and CMC, polysaccharides, PVA or the like are cited as a dispersant. The lubricant is effective, particularly when it is coated onto a mandrel bar in the operation of milling by means of a mandrel mill.

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