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US 5,704,998 AGranted
Hot rolling high-strength steel structural members
AssigneeConsolidated Metal Products, Inc.
InventorHugh M. Gallagher, Jr.
Life of this patent
Estimating the term…
Abstract
High strength steel structural members and a method of making same are disclosed by providing high-strength steel material having a specific chemical composition and preferably a tensile strength of at least about 120,000 psi and a yield strength of at least about 90,000 psi and hot rolling the steel material to provide the structural member of desired geometric configuration.
Claims14
A method of making a high-strength steel structural member comprising the steps of:
- providing high-strength steel material having a tensile strength of at least about 120,000 psi and a yield strength of at least about 90,000 psi, wherein the high-strength steel material comprises, by weight percent:
- carbon about 0.30 to about 0.65%
- manganese about 0.30 to about 2.5%
- at least 1 grain refiner from the group consisting of aluminum, niobium, titanium and vanadium, and mixtures thereof, in an effective amount for grain refining up to about 0.35% iron balance;
- and
- hot rolling the high strength steel material to provide a structural member having a uniform cross-sectional configuration over at least a portion of its length, said uniform cross-sectional configuration being different than a configuration of said material and including at least one flange having a thickness less than an overall perimeter dimension of said cross-sectional configuration, said at least one flange providing increased load bearing capacity to said structural member.
3 more elements
A method of making a high-strength steel structural member comprising the steps of:
- providing high-strength steel material having at least partially a martensite microstructure and a tensile strength of at least about 120,000 psi and a yield strength of at least about 90,000 psi;
- wherein the high-strength steel material comprises, by weight percent:
- carbon about 0.30 to about 0.65%
- manganese about 0.30 to about 2.5%
- at least 1 grain refiner from the group consisting of aluminum, niobium, titanium and vanadium, and mixtures thereof, in an effective amount for grain refining up to about 0.35% iron balance;
- and
- hot rolling the steel material to provide a structural member having a uniform cross-sectional configuration over at least a portion of its length, said uniform cross-sectional configuration including at least one flange having a thickness less than an overall perimeter dimension of said cross-sectional configuration, said at least one flange providing increased load bearing capacity to said structural member.
4 more elements
A method of making a high-strength steel structural member comprising the steps of:
- providing high-strength steel material having a tensile strength of at least about 120,000 psi and a yield strength of at least about 90,000 psi, said high-strength steel material comprising, by weight percent:
- carbon about 0.50 to about 0.55%
- manganese about 1.20 to about 1.65%
- at least 1 grain refiner from the group consisting of aluminum, niobium, titanium and vanadium, and mixtures thereof, in an effective amount for grain refining about 0.03 to about 0.20% iron balance;
- hot rolling the steel material at a temperature above about 2000.degree. F., to provide a structural member having a uniform cross-sectional configuration over at least a portion of its length, said uniform cross-sectional configuration including at least one flange having a thickness less than an overall perimeter dimension of said cross-sectional configuration, said at least one flange providing increased load bearing capacity to said structural member, said uniform cross-sectional configuration being selected from the group consisting of O, L, C, Z, I, T, U, V, and W shapes;
- and
- cooling said structural member.
4 more elements
Dependencies are inferred from the claim text.