Martensitic stainless steel for an oil well

Details Martensitic stainless steel for an oil well Martensitic stainless steel for an oil well

1991-07-22

1992-12-01

Yee, Deborah

Metal treatment

Stock

Ferrous

420 67, C22C 3822

Patent

active

051677318

ABSTRACT:
A martensitic stainless steel having good corrosion resistance suitable for use in an oil well having 0.08 to 0.25 wt. % C, 14 to 16 wt. % Cr, 1.0 wt. % or less Si, 2.0 wt. % or less Mn, 0.5 to 3.0 wt. % Ni, 0.03 to 0.10 wt. % N, 0.04 wt. % or less P, 0.01 wt. % or less S, 0.1 to 1.0 wt. % Mo, the balance being Fe and inevitable impurities. The Cr, C, Ni and N being in amounts such that 20 wt. % .gtoreq.Cr-12C+0.75 Ni+10N.gtoreq.13 wt. %. The martensitic stainless steel having a content of .delta.-ferrite of 10% or less. The martensitic stainless steel can contain at least one of 0.05 to 0.30 wt. % V and 0.01 to 0.1 wt. % Nb. Also the martensitic stainless steel can contain 0.5 to 3.0 wt. % Cu. Further the martensitic stainless steel can contain 0.5 to 3.0 wt. % Cu, and at least one of 0.05 to 3.0 wt. % V and 0.01 to 0.1 wt. % Nb.

REFERENCES:
patent: 2693413 (1954-11-01), Kirkby et al.
patent: 3389991 (1968-06-01), Tanczyn
patent: 4838960 (1989-06-01), Yoshino
patent: 4938808 (1990-07-01), Miura et al.

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