Dual-phase steels

Details Dual-phase steels Dual-phase steels

1982-03-25

1983-10-04

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 123, 148 124, 148134, 148144, C21D 802

Patent

active

044076800

ABSTRACT:
A process for producing a dual-phase steel in which strip is hot-rolled and cooled to exhibit a substantially bainite structure throughout its cross-section and in which it is subsequently continuously annealed in the two phase ferrite/austenite field and cooled to transform the austenite to martensite. By inter-critically annealing a bainite as opposed to a ferrite/pearlite starting structure in accordance with this invention a very much finer and more uniform distribution of martensite is obtained--this gives rise to superior combinations of ductility and tensile strength.

REFERENCES:
patent: 3337376 (1967-08-01), Grange
patent: 3726723 (1973-04-01), Coldren et al.
patent: 3904446 (1975-09-01), Uchida et al.
patent: 4023988 (1977-05-01), Stickels et al.
patent: 4062700 (1977-12-01), Hayami et al.
patent: 4113513 (1978-09-01), Uchida et al.
patent: 4159218 (1979-06-01), Chatfield et al.
patent: 4188241 (1980-02-01), Watanabe et al.
patent: 4196025 (1980-04-01), Davies
patent: 4285741 (1981-08-01), Furukawa et al.

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