STEEL BARS AND RODS AND MANUFACTURING PROCESS

摘要

High tensile steel bar or rod having a yield stress of at least 835 N/mm<2> and a UTS of at least 1030 N/mm<2> is produced as follows. A steel having from 0.35 to 0.65 % C, from 0.30 to 1.50 % Mn and from 0.05 to 0.30 % V is water quenched immediately on exiting the last stand in a rolling mill to such an extent that an outer martensitic layer is formed and remaining heat from the core subsequently tempers the martensitic layer.