Powder high-temperature materials based on nickel alloys for strengthening parts of hot zones of metallurgical units

Abstract

A considerable part (up to 50%) of the cost of metallurgical production is determined by the repair cost of equipment and spare parts. In this connection the problem of increasing the wear resistance of rapidly worn parts of metallurgical units operating under extreme conditions under the effect of heating, stresses, aggressive media, and other harmful factors will always remain urgent. One of the ways for solving the problem consists in creating a protective layer with elevated wear and oxidation resistances on the functional surfaces of such parts. The present work is devoted to the determination of the service life of heavily loaded parts of hot zones of continuous casting machines (CCM).Structural components of secondary cooling sections of continuous casting machines, rolls and beams in the first place, operate under very severe conditions. In addition to the high temperature and considerable variable temperature gradients caused by cooling in a water stream, rolls and beams experience mechanical loads. Under these conditions the functional surfaces of the parts wear intensely in contact with the heated (1000 -1300~ slab, oxidize, and acquire defects due to the effect of the aggressive medium (water, slag, sand), which shortens the service life of the equipment and leads to frequent repairs.In this connection, it is important to create rolls and beams for CCM that combine high wear and heat resistance with mechanical strength, corrosion resistance, and high-temperature strength.

Structural features of powder materials operating under high temperatures, stresses, and wear

“…The new powder materials have been tested successfully by plants working in ferrous and nonferrous metallurgy [1 ]. A powder of the studied alloy with a particle size of 50 -315 p.m has been deposited by plasma facing on the functional surfaces of rolls 140 mm in diameter in section "0" of a continuous casting machine, The thickness of the facing layer was 4 ram.…”