Title: Method of manufacturing pipe and drilling rod unit for petroleum and natural gas industry
Application Number: 85107452 Application Date: 1985.10.10
Publication Number: 1000719 Publication Date: 1986.05.10
Approval Pub. Date: 1992.08.05 Granted Pub. Date: 1992.08.05
International Classifi-cation: C21D9/08;C21D9/14;C22C38/22;C22C38/38;E21B17/00
Applicant(s) Name: Mannesmann AG Address:
Inventor(s) Name: Kurt Roether
Attorney & Agent: LI YI
Abstract:
    The present invention relates to a method of making tubing and pipes for conduction in the oil and gas industry or for use as drillpipes, wherein such tubing is connected at both ends with connector sleeves by means of welding, the welding seam being deburred, heated and cut finally. To improve the mechnical carrying capacity of the pipe and drill pipe on the rusting condition so as to adapt it with th physical carrying capacity of them, the steel used for the tubing, pipes or drill pipes as well as for the connector sleeves has the following composition, all percentages by weight, between 0.2 and 0.6 % carbon, between 0.5 and 1.8 % manganese, between 0.5 and 3.5 % combined chromium and molybdenum, not more than 0.2 % phosphorus and not more than 0.005 % sulphur.
Time: 10
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