The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 23, 1992
Filed:
Jun. 25, 1991
Rollin E Hook, Dayton, OH (US);
Armco Steel Company, L.P., Middletown, OH (US);
Abstract
A cold reduced, non-aging, aluminum killed steel characterized by an elongated grain structure and having an r.sub.m value at least 1.8 produced from a slab having a reduced hot rolling temperature. A slab consisting essentially of .ltoreq.0.08% carbon, .ltoreq.0.1% acid sol. aluminum, .ltoreq.0.2% manganese, all percentages by weight, the balance iron and unavoidable impurities, is hot rolled to a sheet from a temperature less than 1260.degree. C. Preferably, the slab is continuously cast from a melt consisting essentially of 0.03-0.08% acid sol. aluminum, 0.003-0.007% total nitrogen, <0.20% manganese, wherein % acid sol. aluminum.times.% total nitrogen is within the range of 1.times.10.sup.-4 to 5.times.10.sup.-4 and is hot rolled from a temperature of 1093.degree.-1175.degree. C. The hot rolled sheet is descaled, cold reduced, batch annealed and temper rolled. Preferably, the cold reduced sheet is annealed in the range of 538.degree.-649.degree. C. and the temper rolled sheet has a tensile strength of 29-32 kg/mm.sup.2, a total elongation of at least 42% and an r.sub.m value of at least 2.0.