| 摘要 |
A cold reduced, non-aging, aluminum killed steel characterized by an elongated grain structure and having an rm value at least 1.8 produced from a slab having a reduced hot rolling temperature. A slab consisting essentially of </=0.08% carbon, </=0.1% acid sol. aluminum, </=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 DEG 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. aluminumx% total nitrogen is within the range of 1x10-4 to 5x10-4 and is hot rolled from a temperature of 1093 DEG -1175 DEG 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 DEG -649 DEG C. and the temper rolled sheet has a tensile strength of 29-32 kg/mm2, a total elongation of at least 42% and an rm value of at least 2.0.
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