Metal treatment – Process of modifying or maintaining internal physical... – With casting or solidifying from melt
Patent
1991-06-25
1992-06-23
Yee, Deborah
Metal treatment
Process of modifying or maintaining internal physical...
With casting or solidifying from melt
148320, 148603, C21D 948, C22C 3806
Patent
active
051239710
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.
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Armco Steel Company, L.P.
Bunyard R. J.
Fillnow L. A.
Johnson R. H.
Yee Deborah
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