Inductoheat developed the high speed inline annealing of copper tube in the 1970's, principally for water tubing to be manufactured in half-hard state with typical diameters of 12.5 - 28 mm diameter heavy wall. In a similar time frame, Mitsui Engineering & Shipbuilding Co. Ltd. likewise took steps into the development of copper tube annealing for the Japanese market, but specialising in air conditioning and refrigeration tubing. With many recent refinements in equipment and process technology brought about by the development in solid state technology, it was decided to bring these two established streams of technologies together to provide an even more refined annealing system for the ACR tube industry.
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