Characteristics and Comparison of Continuous Casting Machine (CCM) and Reheat Furnace (RHF) Rolled Reinforcement Bar

Abstract

Modern rolling process introduces manufacturing of reinforcement bar in combination of continuous
casting and straight rolling to avoid time and cost losses and produce fine quality reinforcement bar.
Using the core heat or heat inside the raw material (generally known as billet), the rolling process is
carried out. This modernized rolling process overcomes reheating losses and cost of transportation
and of course cost of reheating which were faced in previous manufacturing processes. During the
rolling, forces such as compression and tension provided by rolls at each stage results plastic
deformation of material. There forces deform the grains into smaller size with elongated grains
sequentially at every stage resulting fine grain size at final stage of rolling. This paper analyses the
comparison of two different rolling inputs as (Continuous Casting Machine) CCM rolled billet and
reheat rolled billet with the properties of reinforcement bar (rebar) with respect to grain size and
hardness at different stages of manufacturing. It has been found that the cooling (quenching) required
to produce the same grade as CCM rolled rebar is less for RHF rolled rebar. Using same process
parameters for both cases, RHF rebar provides more yield as compared to CCM rebar without
affecting ductility.