METHOD FOR HEATING CONTINUOUSLY CAST BILLET FOR WIRE ROD AND STEEL BAR

摘要

PURPOSE:To stably obtain a steel material having higher uniformity in the cross-section and higher workability than a steel material obtd. by a conventional method by carrying out diffusion treatment so as to actively reduce the amounts of C, Mn, P, etc. CONSTITUTION:The composition of a steel is composed of, by weight, 0.4-1.2% C, =2% Si, 0.3-2% Mn and the balance Fe with inevitable impurities. The composition may further contain 0.01-0.1% Al and/or 0.02% Ti. A billet formed by continuously casting the steel is directly heated so that the temp. of the central part of the billet is increased to 1,250-1,350 deg.C. The billet may be cooled once before the heating. The heated billet is held at that temp. for 1-20hr to reduce segregation.