Heater sheath alloy

Metal treatment – Stock – Ferrous

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420 41, C22C 3850

Patent

active

051603829

ABSTRACT:
A material for electric heater element sheathing, which has good weldability, is oxidation- and corrosion-resistant, and forms an eye-pleasing dark gray or black surface oxide, consists essentially of, by weight, from about 8.75-15.5% nickel, about 19.5-21.0% chromium, about 0.30-0.50 manganese, about 0.50-2.0% silicon, about 0.25-0.60% aluminum, about 0.25-1.0% titanium, up to about 0.05% carbon, up to about 0.005% sulfur, up to about 0.75% copper, up to about 1.0% cobalt, up to about 1.0% molybdenum, up to about 0.02% phosphorus, about 0.001-0.015% calcium plus magnesium and remainder essentially iron, wherein the Ferrite Number is between 3 and 15.

REFERENCES:
patent: 2704317 (1955-03-01), Hummitzch et al.
patent: 3362813 (1968-01-01), Ziolkowski et al.
patent: 3729308 (1973-04-01), Eiselstein et al.
patent: 4141762 (1979-02-01), Yamaguchi et al.
patent: 5021215 (1991-06-01), Sawarngi et al.
patent: 5087414 (1992-02-01), Maniar
Metals Handbook Ninth Edition, vol. 3, Properties and Selection: Stainless Steels, Tool Materials and Special-Purpose Metals, ASM, p. 5, 9.
Sievart et al, "Ferrite Number Prediction to 100FN in Stainless Steel Weld Metal", American Welding Society Publication, Welding Research Supplement, pp. 289-s to 298-s, Dec., 1988.

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