Method for producing a dual-phase ferrite-martensite steel strip

Details Method for producing a dual-phase ferrite-martensite steel strip Method for producing a dual-phase ferrite-martensite steel strip

1978-08-07

1979-06-26

Stallard, W.

Metal treatment

Compositions

Heat treating

148 124, 148 36, 148144, C21D 714

Patent

active

041592182

ABSTRACT:
A dual-phase steel strip is produced by heating a hot rolled steel strip to a temperature within the intercritical temperature range, annealing the heated strip for a period of from 15 seconds to 5 minutes, and controlling the average cooling rate to about 3.6F..degree.-45F..degree./sec. (2C..degree.-25C..degree./sec.) down to the martensite formation temperature of about 850.degree. F..+-.100.degree. F. (454.degree. C..+-.56.degree. C.). The hot rolled strip will have a chemical composition of 0.08 to 0.12% C, 1.25 to 1.8% Mn, 0.5 to 0.7% Si, and 0.1 to 0.7% Cr, the balance being substantially Fe.

REFERENCES:
patent: 3240634 (1966-03-01), Nachtman
patent: 3281287 (1966-10-01), Edstrom et al.
patent: 3729344 (1973-04-01), Lukes et al.
patent: 3830669 (1974-08-01), Matsuoka et al.
patent: 3917492 (1975-11-01), Backman et al.
patent: 3951696 (1976-04-01), Gondo et al.
patent: 4033789 (1977-07-01), Hamburg et al.
patent: 4040872 (1977-08-01), Mudiare
patent: 4062700 (1977-12-01), Hayami et al.
patent: 4072543 (1978-02-01), Coldren et al.
patent: 4088511 (1978-05-01), Rowney

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