Metal treatment – Process of modifying or maintaining internal physical... – With casting or solidifying from melt
Patent
1994-05-27
1996-04-16
Yee, Deborah
Metal treatment
Process of modifying or maintaining internal physical...
With casting or solidifying from melt
B22D 700
Patent
active
055078869
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 grad e of this steel exhibiting a 42 KSI minimum yield strength has from about 0.05 to about 0.10 percent or from about 0.15 to about 0.27 percent carbon, and no more than about 0.02 percent vanadium. Another grade exhibiting a 50 KSI minimum yield strength has from about 0.15 to about 0.27 percent carbon and from about 0.02 to about 0.04 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. 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 Strength 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 Recrystallizaton 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-M-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).
Bodnar Richard L.
Hansen Steven S.
Bethlehem Steel Corporation
Yee Deborah
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