MAKING HARDENABLE ALLOYS BY PRECIPITATION BASED ON CU BY THE CONTINUOUS CASTING PROCESS

摘要

The invention relates to a process of continuous horizontal modified casting to obtain round or square semifinished-products made of Cu alloys hardenable by precipitation with CuCr and CuCrZr, that are used in the electrical engineering, electronics, automatics, oil industry, machine building industry, nuclear power industry and in railway transportation. According to the invention, the process consists in meting in an induction furnace a charge consisting of copper plates with purity of minimum 99.9%, thereafter the charge having reached a temperature ranging from 1200-1220°C, it is poured into the ladle for the transport towards the soaking furnace, being protected during the transport by means of a covering flux comprising CaSiO= 56-63%, NaBO= 28-32% and MgO = 8-12%, in the soaking furnace the charge being protected by an argon atmosphere under pressure, and the high level of deoxidation is carried out by a deoxidizing agent comprising a powder of CaC= 38-42%, CaF=27-32%, metal Mg=12-16%, colloidal graphite for the remainder, all these powders being introduced in sheaths made of copper pipe of 99.9% purity, with the diameter = 10 x 1 and the length of 300 mm, the Cu sheaths with deoxidizing agent being placed on the bottom of the transport ladle before spilling over the charge, and if deoxidation is not in compliance with the parameters, a new amount of Cu sheaths with deoxidizing powder may be added through a hydraulically operated slide valve positioned at the lower side of the ladle.