Continuous annealing process for manufacturing high strength...

Details Continuous annealing process for manufacturing high strength... Continuous annealing process for manufacturing high strength...

C - Chemistry, Metallurgy

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C21D 7/02 (2006.01) C21D 8/04 (2006.01) C22C 38/00 (2006.01) C21D 1/18 (2006.01) C21D 9/52 (2006.01)

Patent

CA 1054495

ABSTRACT OF THE DISCLOSURE A cold reduced steel having a chemical composition which is substantially controlled within the range of 10x[S]% to 2.00% [Mn], 0.003 to 0.02% [N] and (<5x10-4)/[N]% [Al] balance Fe is subjected to a full continuous annealing process comprising a heating-up step of Ac1 to 900°C x 5 to 180 sec., a rapid cooling step from the heating-up temperature to a lower temperature of about room temperature by water-spray, a reheating step from the lower temperature of about room temperature to 150°C to 450°C x 5 to 300 sec., with a final cooling- and coiling step, in this manner high bake-hardenability and excellent non-aging properties are given to the steel.

239825

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