Martensitic stainless steel suitable for use in oil wells

Details Martensitic stainless steel suitable for use in oil wells Martensitic stainless steel suitable for use in oil wells

1993-04-09

1995-01-24

Yee, Deborah

Metal treatment

Stock

Ferrous

420 68, C22C 3844

Patent

active

053839838

ABSTRACT:
A martensitic stainless steel for use in oil wells has improved stability in strength and good resistance to sulfide stress corrosion cracking The steel has a chemical composition consisting essentially, on a weight basis, of: Si: not greater than 1.0%, Mn: not greater than 1.0%, Cr: 10.0-14.0%, Mo: 0.5-7.0%, Ni: 4.0-8.0%, Al: 0.001-0.1%, either Ti in an amount satisfying the following inequality (1) or Zr in an amount satisfying the following inequality (2), optionally one or both of Mg: 0.001-0.05% and Ce: 0.001-0.05%, and a balance of Fe and incidental impurities in which the contents of C, P, S, N, and V as impurities are limited to 0.05% or less, 0.04% or less, 0.005% or less, 0.05% or less, and 0.2% or less, respectively, the composition further satisfying the following inequalities (3) and (4):

REFERENCES:
patent: 2795519 (1957-06-01), Angel et al.
patent: 3769003 (1973-10-01), Kenyon
patent: 5035855 (1991-07-01), Utsunomiya et al.

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