Hot dip aluminum coated chromium alloy steel

Details Hot dip aluminum coated chromium alloy steel Hot dip aluminum coated chromium alloy steel

1988-08-29

1991-06-11

Silverberg, Sam

Coating processes

With pretreatment of the base

Heating or drying pretreatment

427431, 427432, 148 12EA, C23C 212

Patent

active

050231138

ABSTRACT:
Continuous hot dip aluminum coated ferritic chromium alloy steel strip. Strip is cleaned by heating to a temperature no greater than about 650.degree. C. in a direct fired furnace. The cleaned strip is further heated in a protective atmosphere containing at least 95% by volume hydrogen, cooled in the protective hydrogen atmosphere to near or slightly above the melting point of an aluminum coating metal, and passed into a bath of the aluminum coating metal. The low direct fired furnace cleaning temperature and hydrogen protective atmosphere provides good wetting of a chromium alloy steel surface to prevent uncoated areas or pin holes in the aluminum coated layer.

REFERENCES:
patent: 3320085 (1967-05-01), Turner, Jr.
patent: 3925579 (1975-12-01), Flinchum et al.
patent: 4155235 (1979-05-01), Pierson et al.
patent: 4675214 (1987-06-01), Kilbane et al.

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