An electron-beam furnace having the healthy tissue without a breakdown step and without a subsequent calibration process, excellent linearity can be sent to a hot rolling mill (bending and the bending is suppressed), and, cracks or cracks at the corner portions after dissolution in a solvent by hot rolling to provide a suitable titanium slab and the solvent method. As the titanium slabs directly from the solvent of the electron beam melting the template, the length of 1000mm per warp of slab (amount of deformation in the thickness direction to the longitudinal direction) is 5mm or less, deflection (deformation amount in the width direction of the longitudinal direction) is not more than 2.5mm for hot rolling titanium slab. The installation as a solvent, the method of the titanium slab for hot rolling, the electron beam of the rectangular long side mold wall and the short-side mold wall constituting the mold embedded in the melting furnace, and a molten metal from the short-side mold parietal, and, parts of the chamfer at the corner portions solvent method of the titanium slab for hot rolling, characterized in that using a mold.