Method for producing steel bars having improved low...

Details Method for producing steel bars having improved low... Method for producing steel bars having improved low...

C - Chemistry, Metallurgy

21

D

148/34

C21D 8/00 (2006.01) C21D 8/08 (2006.01) C21D 8/10 (2006.01) C22C 38/04 (2006.01) C22C 38/54 (2006.01)

Patent

CA 1262226

METHOD FOR PRODUCING STEEL BARS HAVING IMPROVED LOW TEMPERATURE TOUGHNESS AND STEEL BARS PRODUCED THEREBY Abstract of the Disclosure A method for producing steel bars is disclosed, which comprises the steps of: heating a steel to a temperature not exceeding 1000°C, the steel consisting essentially of : C: 0.02 - 0.10%, Si: not greater than 0.5%, Mn: 1.10 - 2.50%, Mo: 0.15 - 0.50%, Nb: 0.010 - 0.100%, Al: 0.010 - 0.100%, Cu: 0 - 0.30%, Ni: 0 - 1.20%, Cr: 0 - 1.20%, Ti: 0 - 0.05%, and B: 0 - 0.0030%, with the balance being iron and incidental impurities; hot-rolling the heated steel into a bar under such conditions that the finishing temperature is not higher than 850°C or 850 - 750°C with the total reduction during hot rolling, preferably in the temperature range between 880°C and the finishing temperature, being at least 60%, preferably the hot rolling for the last 2n passes being carried out using oval-, and round-type calibers with an equal reduction in thickness for each of the 2n passes; and cooling the hot-rolled bar to room temperature.

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