Dual-phase hot-rolled steel strip

Details Dual-phase hot-rolled steel strip Dual-phase hot-rolled steel strip

1977-01-24

1978-02-07

Stallard, W.

Metal treatment

Compositions

Heat treating

148 36, C21D 714, C21D 946

Patent

active

040725430

ABSTRACT:
A dual-phase hot-rolled steel strip and method of making same which is characterized by a microstructure in the as-rolled condition of discrete islands of hard martensite dispersed through a substantially continuous matrix of soft polygonal ferrite and containing as its essential alloying constituents, about 0.05% to about 0.11% carbon, about 0.6% to 1.8% manganese, about 0.7% to about 1.2% silicon, about 0.2% to about 0.4% molybdenum, about 0.3% to about 0.9% chromium, up to about 0.1% vanadium, and the balance consisting essentially of iron along with the usual impurities and residuals present in conventional amounts. The high strength low alloy steel is further characterized as having good initial formability properties and work hardening characteristics, rendering it eminently suitable for the fabrication of structural components for automobiles, such as bumpers, wheel components and the like.

REFERENCES:
patent: 3787250 (1974-01-01), Korchynsky et al.
patent: 3902927 (1975-09-01), Pernstal
patent: 3928086 (1975-12-01), Bailey
patent: 3930907 (1976-01-01), Bailey
patent: 3947293 (1976-03-01), Takechi et al.
patent: 3970483 (1976-07-01), Spaeder
patent: 4033789 (1977-07-01), Hamburg et al.

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