ELECTRIC RESISTANCE WELDED (ERW) STEEL PIPE FOR OIL WELL USE AND PROCESS FOR PRODUCING ERW STEEL PIPE FOR OIL WELL USE

Title:

ELECTRIC RESISTANCE WELDED (ERW) STEEL PIPE FOR OIL WELL USE AND PROCESS FOR PRODUCING ERW STEEL PIPE FOR OIL WELL USE

Document Type and Number:

WIPO Patent Application WO/2012/144248

Kind Code:

A1

Abstract:

Provided are: an ERW steel pipe for oil well use which can achieve a strength corresponding to API SPEC 5CT Grade P110 without undergoing overall heat treatment and which exhibits excellent toughness; and a process for producing an ERW steel pipe for oil well use. This ERW steel pipe for oil well use has a composition which contains, in mass%, 0.05 to 0.12% of C, 0.03 to 0.5% of Si, 0.80 to 2.2% of Mn, up to 0.03% of P, up to 0.003% of S, up to 0.08% of Al, 0.01 to 0.1% of Nb, 0.005 to 0.03% of Ti, and 0.0005 to 0.003% of B, and up to 0.008% of N, and satisfies Ti>3.4N, with the balance being Fe and unavoidable impurities, and which has a VC90 of 15 to 40.

Inventors:

SAWAMURA MITSURU (JP)
ASAHI HITOSHI (JP)

Application Number:

PCT/JP2012/052512

Publication Date:

October 26, 2012

Filing Date:

February 03, 2012

Export Citation:

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Assignee:

NIPPON STEEL CORP (JP)
SAWAMURA MITSURU (JP)
ASAHI HITOSHI (JP)

International Classes:

C21D8/02; B21B3/00; B21C37/08; C22C38/00; C22C38/14; C22C38/58

Foreign References:

JPH0331423A	1991-02-12
JP2011006781A	2011-01-13
JP2004131799A	2004-04-30

Other References: