Ferritic stainless steel having good corrosion resistance

Details Ferritic stainless steel having good corrosion resistance Ferritic stainless steel having good corrosion resistance

1981-04-07

1982-11-23

Skiff, Peter K.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75128G, 148 12EA, C22C 3826

Patent

active

043603815

ABSTRACT:
A 10-35% Cr ferritic stainless steel stabilized with 0.20-1.00% of Nb wherein Nb%.gtoreq.(8.times.C%+2.0%) with impurities, such as carbon, nitrogen, phosphorous, oxygen and sulfur reduced to given levels is disclosed. By reducing the sulfur content to a level of not greater than 0.002%, preferably less than 0.001% or in cases where copper and/or nickel is added, to a level of not greater than 0.005%, the corrosion resistance of the resulting steel can markedly be improved. Since the ferritic stainless steel of this invention also exhibits a combination of good surface appearance and formability, it can be substituted for certain austenitic stainless steels not only as a general corrosion resistant material, but also as a material for making external automotive trims and so on.

REFERENCES:
patent: 3957544 (1976-05-01), Pinnow et al.
patent: 3963532 (1976-06-01), Demo, Jr.
Janik-Czachor et al., "Effect of Sulfur and Manganese on Nucleation of Corrosion Pits in Iron", Br. Corros. J, 1972, vol. 7, Mar., pp. 90-93.
Uhlig, Corrosion and Corrosion Control, John Wiley & Sons, Inc., 1971, pp. 307-311, 296, 297.

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