Titanium-bearing low-cost structural steel

Details Titanium-bearing low-cost structural steel Titanium-bearing low-cost structural steel

1992-09-08

1994-07-05

Yee, Deborah

Alloys or metallic compositions

Ferrous

Titanium containing

420128, C22C 3814

Patent

active

053265270

ABSTRACT:
A fully killed steel has a composition of from about 0.005 to about 0.020 percent titanium and from about 0.004 to about 0.015 percent nitrogen, with the mole ratio of titanium to nitrogen being less than about 3.42. One grade of this steel exhibiting a 42 KSI minimum yield strength has from about 0.15 to about 0.27 percent carbon and from 0 to about 0.04 percent vanadium. Another grade exhibiting a 50 KSI minimum yield strength has from about 0.05 to about 0.27 percent carbon and at least about 0.02 percent vanadium. The balance of each steel is iron and other elements. Copper may optionally be provided for strength and corrosion resistance. The steel is prepared by continuous casting and hot rolling, without any quenching and tempering required to achieve the desired properties.

REFERENCES:
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. Laduc 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, 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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