Method for producing high-strength steel having improved weldabi

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

1989-12-12

1991-01-29

Yee, Deborah

Metal treatment

Compositions

Heat treating

148 12F, C21D 800

Patent

active

049883933

ABSTRACT:
High-strength steel having a tensile strength of 80 kgf/mm.sup.2 or more is produced by one-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.ltoreq.1.0%; Mn=0.5% to 2.00%, Mo=0.10% to 1.0%, Nb=0.005% to 0.05% B=0.0009% to 0.0012% Al.ltoreq.0.1%; and N.ltoreq.0.0060%.

REFERENCES:
Tetsu to Hagane vol. 67 (1981)'81-S1330.
Tetsu to Hagane vol. 68 (1982)'82-S1443.
Seitetsu Kenkyu vol. 273 (1971) pp. 9904 to 9921.

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