Cold formed high-strength steel structural members
AssigneeConsolidated Metal Products, Inc.
InventorHugh M. Gallagher, Jr.
Life of this patent
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Abstract
A method of making high-strength steel structural members is disclosed by providing a blank of high-strength steel having a ferrite-pearlite microstructure and high-strength mechanical properties and cold forming the blank by rolling, upsetting, forging, or extrusion to provide a structural member having a desired geometric cross-section while the mechanical strength of the structural member remains substantially the same or greater than the blank.
Claims11
A method of making a high-strength steel structural member having a specific uniform cross-sectional configuration comprising the steps of:
- providing a blank of high-strength steel material having a ferrite-pearlite microstructure and a tensile strength of at least about 120,000 psi and a yield strength of at least about 90,000 psi that comprises by weight:
- ______________________________________ 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 refiner up to about 0.35% iron balance;
- and ______________________________________
- cold forming said blank by rolling, upsetting, forging or extrusion to provide a structural member having a uniform cross-sectional configuration, said uniform cross-sectional configuration including at least one flange having a thickness less than an overall outer perimeter of said cross-sectional configuration, said at least one flange providing increased load bearing capacity to said structural member, whereby the mechanical properties of tensile strength and yield strength of said structural member are substantially the same or greater than said blank.
A method of making a high-strength steel structural member having a specific uniform cross-sectional configuration comprising the steps of:
- providing a blank of high-strength steel material having a ferrite-fine pearlite microstructure, a tensile strength of at least about 120,000 psi and a yield strength of at least about 90,000 psi, which material has previously been hot reduced and cold drawn to provide said blank with said high-strength properties, said high-strength steel comprising, by weight percent:
- ______________________________________ carbon about 0.50 to about 0.55% manganese about 1.20 to about 1.65% at least one 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 0.20% iron balance;
- and ______________________________________
- cold forming said blank by rolling, upsetting or extrusion, at ambient temperature to provide a structural member having a uniform cross-sectional configuration, said uniform cross-sectional configuration including at least one flange having a thickness less than an overall outer perimeter 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, whereby the mechanical properties of tensile strength and yield strength of said structural member are substantially the same or greater than said blank.
Dependencies are inferred from the claim text.