C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
80/34
C22C 38/10 (2006.01) C21D 8/02 (2006.01)
Patent
CA 1269256
METHOD OF PRODUCING HOT-ROLLED STRIP HAVING A DUAL-PHASE STRUCTURE Abstract of the Disclosure The invention relates to a method of producing hot- rolled strip having a dual-phase structure from a slab previously produced by ingot casting or continuous casting. The slab contains carbon, manganese, silicon and chromium as essential constituents in addition to iron. The slab is heated up to the rolling temperature, hot-rolled at a temperature above Ar3, rapidly cooled from the rolling temperature and coiled at a relatively low temperature. The characterizing features of the invention are that the hot-rolled strip a) is produced from a steel which, in addition to 0.05 to 0.16% of C, 0.5 to 1.0% of Si, 0.3 to 1.5% of Cr, ? 0.025% of P, ? 0.015% of S, 0.02 to 0.10% of Al and ? 0.011% of N, contains 0.2 to 0.4% of Mn, the remainder being iron and usual impurities, b) is rapidly cooled, immediately after finish-rolling, from final rolling temperature down to the coiling temperature at a mean rate in the range from 30 to 70°C/s and without interruptions, and c) is then coiled at a temperature in the range from 350 to 190°C.
494751
Maid Olaf
Massip Antonio
Meyer Lutz
Muschenborn Wolfgang
Fetherstonhaugh & Co.
Thyssen Stahl Aktiengesellschaft
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