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Method of manufacturing a thick high-strength steel sheet excellent in high heat input welding heat-affected zone toughness, and, thick high-strength steel sheet excellent in high heat input welding heat-affected zone toughness
Method of manufacturing a thick high-strength steel sheet excellent in high heat input welding heat-affected zone toughness, and, thick high-strength steel sheet excellent in high heat input welding heat-affected zone toughness
Method of manufacturing a thick high-strength steel sheet having a good high heat input welding heat-affected zone toughness, and, to provide a thick high-strength steel sheet obtained by it. Residual amount of oxygen OTi having a component composition of provisions combined addition and V B, can be deoxidized by Ti is an element acid de-weak to remain in the after deoxidation by strong deoxidizing element, solid solution in the austenite matrix of transformation before effective boron amount to: After heating to 1300 ℃ from more than 1100 ℃, continuous casting slab Bef, carbon equivalent Ceq is defined by each relationship, 50% cumulative reduction ratio at 850 ℃ or more steel surface temperature to perform rolling or more, then you have a method of cooling to 500 ℃ below the steel surface temperature is to apply the accelerated cooling from 800 ℃ or more.
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