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US 5,326,527 AGranted
Titanium-bearing low-cost structural steel
AssigneeBethlehem Steel Corporation
InventorsRichard L. Bodnar, Steven S. Hansen
Life of this patent
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AssigneeBethlehem Steel Corporation
InventorsRichard L. Bodnar, Steven S. Hansen
Estimating the term…
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.
A fully killed steel consisting essentially of, in weight percent, from about 0.15 to about 0.27 percent carbon, from about 0.5 to about 1.5 percent manganese, less than about 0.04 percent phosphorus, less than about 0.05 percent sulfur, from about 0.1 to about 0.4 percent silicon, from about 0.005 to about 0.020 percent titanium, from about 0.004 to about 0.015 percent nitrogen, with the mole ratio of titanium to nitrogen being less than about 3.42, from about 0.02 to about 0.04 percent vanadium, and the remainder iron plus incidental impurities.
A fully killed steel consisting essentially of, in weight percent, from about 0.15 to about 0.17 percent carbon, from about 0.50 to about 1.50 percent manganese, less than about 0.04 percent phosphorus, less than about 0.05 percent sulfur, from about 0.1 to about 0.4 percent silicon, from about 0.005 to about 0.020 percent titanium, from about 0.004 to about 0.015 percent nitrogen, with the mole ratio of titanium to nitrogen being less than about 3.42, and the remainder iron plus incidental impurities.
A fully killed steel consisting essentially of, in weight percent, from about 0.15 to about 0.17 percent carbon, from about 0.50 to about 1.50 percent manganese, less than about 0.04 percent phosphorus, less than about 0.05 percent sulfur, from about 0.1 to about 0.4 percent silicon, from about 0.014 to about 0.015 percent titanium, from about 0.012 to about 0.015 percent nitrogen, with the mole ratio of titanium to nitrogen being less than about 3.42, and the remainder iron plus incidental impurities.
Dependencies are inferred from the claim text.