Titanium and vanadium dual-phase steel and method of manufacture

Details Titanium and vanadium dual-phase steel and method of manufacture Titanium and vanadium dual-phase steel and method of manufacture

1981-10-05

1983-08-16

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 124, 148 36, C21D 800, C22C 3812

Patent

active

043989705

ABSTRACT:
This invention is directed to a method and to the resulting product, wherein said product is a low-carbon dual phase steel having a combination of high strength, good ductility and a YS/TS ratio .ltoreq.0.6. The method includes the steps of (1) preparing an Al-killed steel consisting essentially of 0.05 to 0.15 wt. % C, up to 2.0 wt. % Mn, up to 1.0 wt. % Si, 0.03 to 0.15 wt. % V and a sufficient amount of titanium to "getter" the excess sulfur and nitrogen, with the balance essentially being iron, where the titanium addition should be at least equal to the atomic percent of the sulfur plus nitrogen, but no more than about 1.6 times, (2) intercritically annealing such steel within the .alpha.+.gamma. temperature range, and (3) cooling to room temperature.

REFERENCES:
patent: 4033789 (1977-07-01), Hamburg et al.
patent: 4325751 (1982-04-01), Josefsson
patent: 4331488 (1982-05-01), Sudo et al.

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