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Recently we have reported on a technique for production of copper–chromium alloys using electro slag crucible melting. Copper containing upto 1% chromium is a precipitation hardening alloy which exhibits good room temperature strength, ductility and high electrical and thermal conductivities. The electroslag crucible melting process uses chromium metal and copper scrap for producing Cu– Cr alloy, thereby obviating the need for using expensive and proprietary master alloys containing upto 10% chromium. The process was subsequently modified to alloy chromium to copper by in-situ reduction of chromium oxide added to the slag. The electroslag crucible melting process is a specialized melting process and is not practised universally. In the present work, a more conventional melting process, namely Air Induction Melting (AIM) process is described to produce Cu–Cr alloys using fine copper scrap as a raw material. AIM is normally not used for melting light scrap due to difficulty in electro magnetic coupling with the charge. Extensive surface oxidation of the charge is also a problem. The process described here uses a modified charging schedule and melting under slag cover to overcome these problems. The chromium is alloyed to copper by in-situ reduction of chromium oxide.

Production of Cu-Cr Alloys by In-situ Reduction of Chromium Oxide during Air Induction Melting