Corrosion resistant austenitic stainless steel

Details Corrosion resistant austenitic stainless steel Corrosion resistant austenitic stainless steel

1998-12-17

2000-03-14

Yee, Deborah

Alloys or metallic compositions

Ferrous

Nine percent or more chromium containing

420 49, C22C 3834, C22C 3842

Patent

active

060369175

ABSTRACT:
An alloy having a composition, by weight, of about 0.025% or less carbon, about 0.5 to about 4.1% manganese, about 5.5 to about 6.2% silicon, about 11 to about 15% chromium, about 9.0 to about 15.5% nickel, about 0.8 to about 1.2% molybdenum and about 0.8 to about 2% copper and the remainder being essentially iron with incidental impurities. This composition results in lean alloy content in a high silicon austenitic stainless steel for concentrated sulfuric acid service while maintaining a corrosion rate similar to and competitive with existing alloys for such service. Acceptable characteristics were found when hot working was carried out in the range of about 2100.degree. F. to about 2200.degree. F. Annealing in the range of about 1925.degree. F. to about 2025.degree. F. is preferred, as is rapid water quenching after annealing.

REFERENCES:
patent: 4543244 (1985-09-01), Jones et al.
patent: 5028396 (1991-07-01), Jones et al.
patent: 5032373 (1991-07-01), Jones et al.
Welding Handbook, Eighth Editi1on, vol. 4, "Materials and Applications Part 2", William R. Oates. Alexander M. Saitta, American Welding Society1998,, pp. 261-270.

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