Dual phase high strength cold-rolled steel plate

Details Dual phase high strength cold-rolled steel plate Dual phase high strength cold-rolled steel plate

1980-09-03

1982-02-09

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

75126B, 75126K, 75126P, C22C 3838, C22C 3832

Patent

active

043148620

ABSTRACT:
A dual phase high strength cold-rolled steel plate, comprising 0.02-0.15 weight % carbon, 1.5-2.5 weight % Mn, less than 0.2 weight % Si, 0.2-1.5 weight % Cr, 0.03-0.15 weight % P, less than 0.06 weight % Al, less than 0.02 weight % S, and the balance iron and unavoidable impurities. The steel according to the present invention permits the low-temperature transformation products to be formed in a greater proportion within a short annealing time to lower the yield ratio and zeroizes the yield point elongation without skin pass rolling. Moreover, the composition is completely free from adverse effects on tensile strength, ductility and galvanizing properties and can provide cold-rolled steel plate suitable for a wide use including motor vehicles.

REFERENCES:
patent: 3830669 (1974-08-01), Matsuoka et al.
patent: 3920051 (1975-11-01), Bell et al.
patent: 4062700 (1977-12-01), Hayami et al.
patent: 4072543 (1978-02-01), Coldren et al.
patent: 4196025 (1980-04-01), Davies

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