Method of preparing titanium-bearing low-cost structural steel

Details Method of preparing titanium-bearing low-cost structural steel Method of preparing titanium-bearing low-cost structural steel

1995-06-07

1996-05-07

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

With casting or solidifying from melt

148547, C21D 802

Patent

active

055142273

ABSTRACT:
A fully killed steel has a composition that is tailored to meet a 50 KSI minimum yield strength after hot rolling and accelerated cooling. The steel has a carbon content in the range of from about 0.05 to about 0.10 percent or from about 0.15 to about 0.27 percent, from about 0.005 to about 0.020 percent titanium, from about 0.004 to about 0.015 percent nitrogen, from 0 to about 0.02 percent vanadium, and the remainder iron plus incidental impurities. The steel is continuously cast, hot rolled to plate, and cooled to a temperature of less than about 1100.degree. F. at a cooling rate lying in a cooling rate band extending from about 2.degree. to about 14.degree. F./sec at 2 inches plate thickness, from about 7.degree. to about 26.degree. F./sec at 1 inch plate thickness, and from about 13.degree. to about 45.degree. F./sec at 1/2 inch plate thickness.

REFERENCES:
Stanislaw Zajac et al., "Recrystallization Controlled Rolling and Accelerated Cooling for High Strength and Toughness in V-Ti-N Steels," Met. Trans., vol. 22A, pp. 2681-2694 (1991).
J. S. Smaill et al., "Effect of titanium additions on strain-aging characteristics and mechanical properties of carbon-manganese reinforcing steels," Metals Technology, pp. 194-201 (1976).
L. A. Leduc et al., "Hot Rolling of C-Mn-Ti Steel," in Thermomechanical Processing of Microalloyed Austenite, pp. 641-654 (1982).
S. Ye, "Influence of Rolling and Cooling Process on Microstructure and Properties of C-Mn Steel Treated with Al-Ti-CaSi Combined Addition", Iron steel (China), vol. 23(9), pp. 31-35 (1988).
Shyi-Chin Wang, "The Effect of Titanium and Nitrogen Contents on the Microstructure and Yield Streength of Plain Carbon Steels," China Steel Technical Report, No. 3, pp. 20-25 (1989).
F. B. Pickering, "Titanium nitride technology," in Microalloyed Vanadium Steel, pp. 79-95 (1990).
Tadeusz Siwecki et al., "Evolution of Microstructure During Recrystallization Controlled Rolling of HSLA Steels," in Proc. of 33rd Mechanical Working and Steel Processing Conference (Oct. 1991).
C. R. Killmore et al., "Titanium Treated C-Mn-Nb and C-Mn-V Heavy Structural Plate Steels with Improved Notch Toughness" (reference unknown).
ASTM Standard A572/A572M-88c, "Standard Specification for High-Strength Low-Alloy Columbium-Vanadium Steels of Structural Quality" (1988).
ASTM Standard A36/A36M-88c, "Standard Specification for Structural Steel" (1988).
ASTM Standard A529/A529M-88, "Standard Specification for Structural Steel with 42 ksi 290 MPa! Minimum Yield Point (1/2 in. 13 mm! Maximum Thickness" (1988).

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