Oil well casing and tubing joint and production of same
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United States of America Patent
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Oct 2, 1984
Grant Date -
N/A
app pub date -
Aug 13, 1982
filing date -
Aug 20, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A joint for used in connecting oil well casing and/or tubing and method of producing same are disclosed. The joint with improved metal-to-metal sealing properties as well as improved resistance to galling is made of an alloy steel containing 10% or more by weight of Cr and comprises a metal sealing portion and a threaded portion provided with an activating layer of a metal or an alloy selected iron, nickel, zinc, cobalt, copper, manganese, chromium and alloys thereof, and an electrodeposited layer of a metal or an alloy selected from iron, copper, zinc, chromium, nickel, and alloys thereof.
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