CMTTM (Continuous Mill Technology) takes our basic minimill design a step further. It ensures short routes by linking the rolling mill directly to the steelworks. Unlike previous plants, CMTTM no longer requires a heating furnace. Instead, the casting heat goes directly into rolling.
This new process re-aligns continuous casting and rolling as never before. It includes our Concast Invex® system for higher casting speeds. Perfectly uniform core and surface temperatures mean the billets can be fed directly into the rolling mill. To ensure even heat, the intermediate induction heating system records the temperature on the billet and adjusts it only at the necessary points. You save money because the investment costs for the SMS Elotherm induction heating plant are around 25 to 30 percent lower than those for conventional furnaces. The bottom line: CMTTM is an innovation that pays off in more ways than one. That’s because the process not only drastically cuts CO2 emissions, but also slashes operating costs.
It was a groundbreaking project for both SMS group and our customer: the world’s first CMTTM reference plant. Tung Ho Steel commissioned us to build a rebar rolling mill in Taoyuan/Taiwan. Paramount among the requirements were the lowest possible energy consumption as well as minimal emissions. So, in response to this challenge, we developed our CMTTM technology. Now the steelworks, featuring electric arc furnace, ladle furnace, and five-strand billet caster, produces 1.2 million tons of billet every year. The rebar rolling mill has an annual capacity of 800,000 tons. Here is the operating sequence: when hot billets leave the continuous caster they go into the induction heating plant. This ensures they gain a consistent temperature. Then they travel directly into the rebar rolling mill.
When the conditions are just right, induction heating is no longer necessary. That’s because the special shape of the billets means they lose hardly any heat during downstream production. The entire process offers you far greater sustainability and results in significant, long-term savings of both money and resources.