Metal treatment – Compositions – Heat treating
Patent
1978-07-19
1979-07-03
Stallard, W.
Metal treatment
Compositions
Heat treating
148 12R, 148 16, 148127, C21D 174
Patent
active
041599187
ABSTRACT:
A compound steel material of high corrosion resistance is manufactured by alloying a carbon steel carrier material having a carbon content of at most 0.20C and of at least 0.04C with a carbide and nitride forming substance, compounding the alloyed carrier material with a ferritic chromium steel material of normal carbon content, followed by hot-rolling the compound steel material to a hot rolled strip or sheet which is then annealed at a temperature and for a time period sufficient for the carbon content of the ferritic chromium steel coating layer to be reduced to between 0.001 and 0.003% so as to increase the corrosion resistance of the chromium steel material to that of a superferritic material. After annealing, the sheet may be etched and surface-finished or cold-rolled, recrystallization annealed and thereafter surface-finished, such as temper-rolled. The ferritic chromium steel material has at most 0.1% of carbon prior to annealing. The carbide and nitride forming substance may be titanium whose content in the alloyed carrier material is preferably between 0.50% and 2.00%. The thickness of the ferritic chromium steel coating layer is between 50 and 500 .mu.m, the annealing temperature between 650.degree. and 900.degree. C., and the annealing time period between 8 and 72 hours.
REFERENCES:
patent: 2653117 (1953-09-01), Keene
patent: 3489618 (1970-01-01), Holtzman
patent: 3795971 (1974-03-01), Chivinsky
patent: 3891820 (1975-06-01), Debray
Kosmider Hans
von Bogdandy Ludwig
Klockner-Werke AG
Stallard W.
Striker Michael J.
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