Method for producing high-strength steel having improved...

Details Method for producing high-strength steel having improved... Method for producing high-strength steel having improved...

C - Chemistry, Metallurgy

21

D

148/34

C21D 8/02 (2006.01) C21D 1/18 (2006.01) C22C 38/04 (2006.01)

Patent

CA 1246969

- 17 - METHOD FOR PRODUCING HIGH-STRENGTH STEEL HAVING IMPROVED WELDABILITY ABSTRACT OF THE DISCLOSURE High-strength steel having a tensile strength of 80 kgf/mm2 or more is produced by on-line quenching or on-line quenching and tempering. The steel has also excellent low-temperature toughness and excellent weldability, which makes high temperature preheating unnecessary prior to welding. The composition is: C = 0.04% to 0.11%; Si ? 1.0%; Mn = 0.5% to 2.00%; Mo = 0.10% to 1.0%; Nb = 0.005% to 0.05%; B ? 0.01%; Al ? 0.1%; and N ? 0.0060%.

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