Method for producing high-strength deep-drawable dual-phase stee

Details Method for producing high-strength deep-drawable dual-phase stee Method for producing high-strength deep-drawable dual-phase stee

1984-03-05

1986-09-02

Stallard, Wayland

Metal treatment

Process of modifying or maintaining internal physical...

Chemical-heat removing or burning of metal

148 12F, 148 124, C21D 952

Patent

active

046094105

ABSTRACT:
High-strength, deep-drawable, steel sheet exhibiting dual-phase properties is produced by (i) initially annealing the sheet to achieve crystallographic textures yielding high deep drawability, (ii) heating the sheet to a temperature above the A.sub.1 for a time sufficient to produce from 2 to 10% austenite, and thereafter (iii) rapidly cooling to transform at least a portion of the austenite to martensite or bainite. To achieve such transformation of austenite, the composition of the steel must be selected to provide a requisite degree of hardenability.

REFERENCES:
patent: 3954516 (1976-05-01), Hu
patent: 4050959 (1977-09-01), Nakaoka et al.
patent: 4062700 (1977-12-01), Hayami et al.
patent: 4145235 (1979-03-01), Gondo et al.
patent: 4292097 (1981-09-01), Nakazato et al.

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