Oil country tubular goods excellent in collapse...

Details Oil country tubular goods excellent in collapse... Oil country tubular goods excellent in collapse...

2003-06-12

2008-12-02

Yee, Deborah (Department: 1793)

Metal treatment

Stock

Ferrous

C148S330000, C148S331000, C148S332000, C148S333000, C148S334000, C148S335000, C148S909000

Reexamination Certificate

active

07459033

ABSTRACT:
The present invention provides a method of production of oil country tubular goods having a small drop in collapse pressure after expansion and having a collapse pressure recovering by low temperature ageing at about 100° C. and oil country tubular goods obtained by this method of production.This method of production comprises hot rolling a steel slab having amounts of addition of C, Mn, P, S, Nb, Ti, Al, and N in specific ranges and having a balance of iron and unavoidable impurities and shaping the steel strip coiled at a temperature of not more than 300° C. as it is into a tube. Alternatively, it comprises heating steel pipe having amounts of addition of C, Mn, P, S, Nb, Ti, Al, and N in specific ranges and having a balance of iron and unavoidable impurities to a temperature of the Ac3[° C.] to 1150° C., then cooling it in a range of 400 to 800° C. at a rate of 5 to 50° C./second.

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patent: 2002129283 (2002-05-01), None

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