HIGH-STRENGTH STAINLESS STEEL PIPE HAVING HIGH TOUGHNESS AND EXCELLENT CORROSION RESISTANCE FOR OIL WELL

Title:

HIGH-STRENGTH STAINLESS STEEL PIPE HAVING HIGH TOUGHNESS AND EXCELLENT CORROSION RESISTANCE FOR OIL WELL

Document Type and Number:

Japanese Patent JP2010209402

Kind Code:

A

Abstract:

To provide an inexpensive high-strength martensitic stainless steel pipe for use in oil wells which has excellent hot workability and a high strength exceeding 654 MPa of YS, further exhibits excellent CO2corrosion resistance under severe high-temperature corrosive environment of ≥170°C containing CO2, Cl-, etc., and excellent SSC resistance even under H2S-containing environments, and stably has high toughness.

The stainless steel pipe contains, by mass, ≤0.04% C, ≤0.50% Si, 0.20 to 1.80% Mn, ≤0.03% P, ≤0.005% S, 15.5 to 17.5% Cr, 2.5 to 5.5% Ni, ≤0.20% V, 1.5 to 3.5% Mo, 0.50 to 3.0% W, ≤0.05% Al, ≤0.15% N and ≤0.006% O so as to satisfy three correlational formulae, and has microstructure, wherein regarding the largest one of the crystal grains composing the microstructure, the distance between two points in the crystal grains is ≤200 μm.

Inventors:

NAGAHAMA TAKUYA
KIMURA MITSUO
MIZUNO YUSUKE
SHIMAMOTO TAKESHI

Application Number:

JP2009056363A

Publication Date:

September 24, 2010

Filing Date:

March 10, 2009

Export Citation:

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Assignee:

JFE STEEL CORP

International Classes:

C22C38/00; C22C38/58

Domestic Patent References:

JP2008081793A

2008-04-10

Attorney, Agent or Firm:

Kenichiro Ochiai
Kazuhiro Mori

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