C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/32, 117/94
C21D 8/02 (2006.01) C21D 8/04 (2006.01) C22C 38/12 (2006.01) C22C 38/14 (2006.01) C23C 2/02 (2006.01) C23C 8/06 (2006.01)
Patent
CA 2022907
ABSTRACT OF THE DISCLOSURE A method of manufacturing steel sheets by applying continuous annealing after applying hot rolling or hot rolling and cold-rolling customary method to steel material, containing less than 0.007% of C, less than 0.1% of Si, from 0.05 to 0.50% of Mn, less than 0.10% of P, less than 0.015% of S, from 0.005 to 0.05% of sol.Al and less than 0.006% of N, further, containing Ti and/or Nb added solely or in combination within such a range that the relationship of the effective amount of Ti (referred to as Ti?) and the amount of Nb in accordance with the following formula (1) with the amount of C can satisfy the following formula (2): Ti?(%) = total Ti(%)-((48/32) x S(%)+(48/14) x N(%))--- (1) 1 ? (Ti?/48 + Nb/93)/(C/12) ? 4.5 --- (2) if necessary, further containing from 0.0001 to 0.0030% of B and the balance of Fe and inevitable impurities, wherein continuous carburization and/or nitriding is applied, simultaneously, with the annealing such that the amount of solid-solute C and/or the amount of solid-solute N in the steel sheet is from 2 to 30 ppm. Steel sheets having excellent resistance to the cold-work embrittlement or provided with the BH property can be produced without deteriorating properties required for steel sheets, in parti- cular, formability. - 40 -
Hashimoto Shunichi
Kitamura Mitsuru
Kabushiki Kaisha Kobe Seiko Sho
Riches Mckenzie & Herbert Llp
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