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Synopsis: Our experience and study on the refining and solidification in a 40t slab ESR process at Yawata Works and the properties of the rolled heavy plates are reported in this paper. Inclusions inthe ESR ingot are quite small and few. Desulphurization togaseous phase plays an important role in the total desulphurization of ESR. The deoxidation is discussed form the viewpoint of Al-O equilibrium. In order to obtain hydrogen contents lower than 1 ppm, the control of atmosphere and the use of recycled slag are necessary. The secondary mist cooling practice has been developed for the prevention of ghost lines in large ESR ingots. Heavy plates rolled from the ESR ingot show excellent ductility and impact properties to convetional materials. A high reliability n material properties i secured by the application of ESR process.

Refining and Qualty of Slabs and Heavy Plates Produced by 40t Electro-Slag-Remelting Process