Metal treatment – Compositions – Heat treating
Patent
1987-01-13
1988-05-17
Brody, Christopher W.
Metal treatment
Compositions
Heat treating
148128, 148 167, 148136, C21D 174
Patent
active
047448377
ABSTRACT:
A process for bright annealing of chromium containing alloys such as stainless steels in an atmosphere of nitrogen and hydrogen containing controlled additions of an inhibitor as described in U.S. Pat. No. 4,334,938 wherein at least one element provided at the surface of the article being annealed in an amount such that it is oxidized in preference to the chromium in said article, whereby nitrogen uptake is inhibited and dulling of the metal surface by formation of a film containing chromium oxide is avoided.
REFERENCES:
patent: 2703298 (1955-01-01), Branson et al.
patent: 2709145 (1955-05-01), Bucknall
patent: 4210469 (1980-01-01), Shimada et al.
patent: 4334938 (1982-06-01), Shay et al.
Brockington James W.
Cabrera Alejandro L.
Coe Charles G.
Kirner John F.
Air Products and Chemicals Inc.
Brody Christopher W.
Marsh William F.
Simmons James C.
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