Lentyugov I. Flux-cored wires for surfacing with a mixture of ligatures, obtained by electroslag remelting of abrasive waste high-speed steels.

The work is devoted to the research and development of flux-cored wires for wear-resistant surfacing, in the charge of which ligatures are used, produced by electroslag remelting of metal-containing wastes formed during the abrasive treatment of high-alloyed high-speed steels. For the first time a technology has been proposed, that makes it possible to efficiently process abrasive processing waste of high-speed tool steels into high-alloy ligatures, which are used as a batch of flux-cored wires for surfacing. The technology of waste processing includes: input control of the chemical composition, calcination at a certain temperature, magnetic separation, ESR metal component of the waste, grinding the resulting ligatures, control of the chemical composition of the ligatures. It was established experimentally that in order to maintain a sustainable process of ESR waste it is necessary that the specific power of the process be ≥ 150 W/cm2. This power provides the melting rate of particles at the level of 2-2,5 kg/min (120-160 kg/h). At the same time, about 30 % of the total heat consumption is spent on the melting of waste, which ensures a rather high efficiency of the ESR process. It is shown that when using a ligature powder as the main component of the charge of the flux-cored wire PP-Np-120V3HMF, a deposited metal is obtained that corresponds in type to the chemical composition of Fe4 according to DSTU EN 14700:2008. According to the alloying system, the weld metal of this type can be attributed to chrome-volfram, chrome-molybdenum semi-heat-resistant steels. Flux-cored wires of this type are used for surfacing hot and cold deformation tools for metals. The results obtained in the work are confirmed by a pilot test of hot stamping dies, deposited by the developed flux-cored wire PP-Np-120V3HMF. A certain effect will also be ensured by the return to industrial production of metal-containing abrasive waste from tool high-speed steels.