Abstract: A converter for refining a liquid metal bath using simultaneous heating and blowing in comprises a metal vessel internally lined with refractory material, having an upwardly open mouth and having a generally cylindrofrustoconical shape which is a body of revolution about an axis, the vessel being mounted on, and rotatable about, its axis of revolution relative to a pivotable cradle, the vessel having a pouring spout and a set of tuyeres extending through a wall thereof, and a separate frustoconical cap connected to a gas collection hood for surmounting the vessel and provided with an opening through which a heating device can extend into the vessel, the arrangement being such that in the `normal` position of the vessel, for simultaneous blowing in and heating, the axis of revolution of the vessel is at an angle between 35.degree. and 55.degree. to the vertical, the pouring spout is upwardly directed, the tuyeres extend upwardly from the bottom of the vessel and the vessel is surmounted by the cap.