Patent ID: 8361248
Filing Date: 2013-01-29
Classification: B23K,C21D,C22C

Abstract:
1. Steel plate superior in Crack Tip Opening Displacement properties of a heat-affected zone containing, by mass %, C: 0.015 to 0.045%, Si: 0.05 to 0.2%, Mn: 1.5 to 2.0%, Cu: 0.25 to 0.5%, Ni: 0.7 to 1.5%, P: 0.008% or less S: 0.005% or less, Al: 0.004% or less, Ti: 0.005 to 0.015%, Nb: 0.001% or less, O: 0.0015 to 0.0035%, N: 0.002 to 0.006%, P CeqH: 0.235 or less and a balance of Fe and unavoidable impurities, where