Improving the hot-repair technology for lining a converter using GIR-RB-X developed magnesia mass of the company GIR-ENGINEERING

The analysis of the methods of hot repair of areas of advanced wear of the working lining of converters has been performed. A method for assessing the quality of a self-flowing magnesian fermentation mass on a rotary-type laboratory furnace has been developed. A repair mass of the brand GIR-RB-X has been developed, based on secondary raw materials, which allows to effectively restore the areas of the refractory lining of the converter, which are subject to advanced wear. Industrial tests of a self-flowing magnesian repair mass on the linings of heavy-duty converters were conducted under the conditions of PJSC DMK and PJSC «MK «Azovstal». The company GIRENGINEERING Ltd organized mass production of the mass of the brand GIR-RB-X in PJSC KrOZ. Ill. 6. Ref. 11. Tab. 1.

Tube for obtaining crystals in a laboratory furnace

A design for an air-cooled tube (`crystallization incubator') installed in a laboratory tube furnace is presented. The setup allows regulation and simultaneous crystallization of several substances at different temperature gradients and rate intervals, with the purpose of obtaining crystals.

THE INFLUENCE OF THE MICROSTRUCTURE OF A CHROMOSILICONIZED LAYER ON THE TRIBOCORROSIVE PROPERTIES EXPOSED TO MINE WATER

This paper presents the results of a study analysing the influence of the microstructure of a chromosiliconized layer produced using C90U steel on the tribocorrosive properties exposed to mine water. The steel coating process was conducted at a temperature of 1000°C for 8 hours. The layer was prepared by the powderpack method with the use of powdered ferrochrome with SiC, kaolin powder, and ammonium chloride as the activator. Samples of C90U steel were placed in the powder mixture inside specially designed boxes of X6CrNiTi18-10 steel and were heated in a laboratory furnace. The boxes were closed and sealed hermetically with enamel to prevent charge oxidation. The microstructure, chemical and phase composition of the chromosiliconized layer were analysed. Thickness, porosity, and hardness were measured. The wear of the chromosiliconized layer resulting from exposure to a corrosive environment of model mine water was analysed. A tribocorrosion test was conducted with the use of a wear tester composed of three rollers and a cone. The chromosiliconized layer produced by the powder-pack method on C90U steel contributed to an increase in the hardness of friction systems exposed to a corrosive medium in comparison with uncoated steel.