PROCESS FOR PRODUCING THICK HIGH-STRENGTH STEEL PLATE WITH EXCELLENT TOUGHNESS OF HEAT-AFFECTED ZONE IN HIGH HEAT INPUT WELDING AND THICK HIGH-STRENGTH STEEL PLATE WITH EXCELLENT TOUGHNESS OF HEAT-AFFECTED ZONE IN HIGH HEAT INPUT WELDING

摘要

good substitute heat welded with heat-affected zone toughness of high strength steel plate production method and then , depending on the method of manufacturing the same after obtaining a high strength steel sheet provides . The composition of complex regulations that have added to the B and V, the remaining amount of oxygen robbing acid elements that can be looted by the oxygen and the oxygen remaining after acid element of Ti by OTi, prior austenite transformation Peng small to be effective in the employment possess : Bef , the carbon equivalent Ceq is a continuously cast slab which is defined by the angle relationship , then heated to 1100 or less than 1300 , the steel surface temperature is more than 850 , subjected to rolling of 50% or higher cumulative rolling amount , and then from steel surface temperature and by applying accelerated cooling from above 800 in a manner that cooling to below 500 .