Stainless-steel pipe for oil well and process for producing...

Details Stainless-steel pipe for oil well and process for producing... Stainless-steel pipe for oil well and process for producing...

2009-04-02

2010-11-30

Wyszomierski, George (Department: 1793)

Metal treatment

Stock

Ferrous

C420S049000, C420S053000, C420S061000, C420S067000, C420S070000, C420S091000, C420S119000, C420S120000, C420S123000

Reexamination Certificate

active

07842141

ABSTRACT:
A steel composition contains: 0.05% or less of C; 0.5% or less of Si; 0.20% to 1.80% of Mn; 0.03% or less of P; 0.005% or less of S; 14.0% to 18.0% of Cr; 5.0% to 8.0% of Ni; 1.5% to 3.5% of Mo; 0.5% to 3.5% of Cu; 0.05% or less of Al; 0.20% or less of V; 0.01% to 0.15% of N; and 0.006% or less of O on a mass basis, and satisfies the following expressions: Cr+0.65Ni+0.6Mo+0.55Cu−20C≧18.5 and Cr+Mo+0.3Si−43.5C−0.4Mn−Ni−0.3Cu−9N≦11 (where Cr, Ni, Mo, Cu, C, Si, Mn, and N represent their respective contents (mass %)). After such a steel pipe material is formed into a steel pipe, the steel pipe is quenched by cooling after heating to a temperature of the AC3transformation point or more and tempered at a temperature of the AC1transformation point or less.

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Machine translation of JP 2001-179485 published Jul. 3, 2001.
Written translation of JP-A-13179485 published Jul. 3, 2001.
ASM International, Materials Park, Ohio, Metallographer's Guide: Practices and Procedures for Irons and Steels, Chapter 1, “Introduction to Steels and Cast Irons,” p. 3, Table 1.1, 1999.

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