Sumitomo Electric Industries, Ltd. has improved its original hot-rolled wire rod direct heat-treatment process (New ED Process*) and renewed the wire rod bundling machine to mass-produce thin wire rods up to 4 mm in diameter. Mass-produced steel wire rods will go on sale in April 2012.
In producing wire rods thinner than 5.5 mm, we had been confronted with the problem of uneven mechanical properties and unstable configuration of coiled wire rods. At this time, we optimized the New ED Process conditions to uniformly heat-treat the wire rods. In addition, the newly introduced automatic bundling machine bundles the coiled wire rod simultaneously at four points, thereby ensuring stable coil configuration.
Since mass-produced wire rods do not require any drawing or off-line heat treatment, secondary processing firms can reduce fabrication costs and environmental loads.