PROCESS TECHNOLOGY FOR THE PRODUCTION OF AS-ROLLED HIGH STRENGTH STEEL PLATES WITH IMPACT TOUGHNESS GUARANTEE

摘要

The present invention relates to the process for manufacturing of a as-rolled high strength steel plates comprising the steps of charging and casting of the different compositions of raw materials in Basic Oxygen furnace; refining of the castables using Vacuum Arc Degassing (VAD) Unit; continuous casting of the alloy slabs; soaking of slabs in Reheating furnaces; controlled rough rolling of the slabs in the Plate mill with Hot working of the cast alloy; controlled finished rolling of the slabs in the Plate mill; air-cooling of the steel plates during rolling and the cost effective as-rolled high strength steel plates comprises essentially of, in weight percent, weight percent of about 0.16% to 0.18% Carbon, 1.50% to 1.60% Manganese, 0.40% to 0.60% silicon, 0.02% (max) Phosphorus, 0.01% (max) Sulphur, 0.02% (min) Aluminium, 0.03% to 0.04% Niobium, 0.14% to 0.16% Vanadium and 0.01% to 0.02% (max) Titanium and balance essentially iron.