A.V. Valueva

Manufacturing Component Parts of Mining Equipment With Application of Hardening Technologies

To ensure highest hardness and wear resistance the authors develop an aggregate technology of manufacturing mining equipment component parts. The aggregate technology of manufacturing faced component parts includes the following operations: plasma-jet hard-facing with high-speed steels; high-temperature tempering after the facing, ultrasonic surface strengthening treatment, additional tempering, reconstructive facing.

Traditional Technology of Chromium-Tungsten Steels Facing, its Disadvantages and Suggestions for their Eliminations

To reveal the disadvantages of the traditional technology of facing with chromium-tungsten steels analysis of the given technology was completed. The analysis showed that the main disadvantages of the technology are high-temperature heating and underutilization of high-alloyed metal properties. To eliminate the disadvantages we developed the methods of facing allowing obtaining faced metal which state is close to that of the hardened one without cracks.

Optimizing Technological Parameters of the Reduction Processes in Treating Steels in a Ladle Furnace

This work reports the possible development of reduction processes when treating the molten metal and slag using a ladle furnace under conditions of intensive stirring with an inert gas. The industrial data have been received, confirming the possibility of decreasing the concentration of ferrous and manganese oxides in the slag and stabilizing the contents of manganese and silicon in the metal.

Kinetic Study of the Effect of Plasticity and its Role in Stress Relaxation in the Weld Speed Steel during the Martensitic Transformation

It is shown that in the weld metal of the type of high-speed steels observe the effect of kinetic plasticity and he owns a defining role in stress relaxation. It is shown that the kinetic effect of plasticity can be used to control the stress in the weld details.

Selection Criteria Parameter Thermal Cycle during Surfacing Heat Resistance High Hardness Parts of Metallurgical Equipment

In the paper criteria of thermal cycle parameterization for surfacing of metallurgical equipment parts with heat-resistant steels are proposed.

A Technology of Wastewater Sludge Treatment

At many communities, industrial and agricultural enterprises, treatment and recycling of wastewater sludge is an urgent task as the sludge is poured and stored in sludge banks for many years and thus worsens the ecology and living conditions of the region. The article suggests a new technology of wastewater sludge treatment using water-soluble binder and heat treatment in microwave ovens.

Influence of Cooling Rate in High-Temperature Area on Hardening of Deposited High-Cutting Chrome-Tungsten Metal

The authors study the influence of cooling rate in high-temperature area for thermal cycle of high-cutting chrome-tungsten metal weld deposit on the processes of carbide phase merging and austenite grain growth for the purpose of providing high hardness of deposited metal (HRC 64-66).

Extraction of Chromium from Carbon Ferrochromium Residual Wastes

This work reports the problem of processing residual wastes after producing carbon ferrochrome by recycling dust using a hydrometallurgical method with the purpose of extracting the basic component - chromium, The X-ray diffraction analysis results, chemical and granulometric compositions of dust from the carbon ferrochrome production are given, The method for the production of chemical-enrichment concentrate (CEC) by processing ferrous dust is described, with obtaining a middling product - sodium mono-chromate with its further reduction to chromium hydroxide, followed by autoclave leaching, and resulting in the production of chemically enriched chrome concentrate, The plant used for autoclave leaching and filtering is schematically depicted, The smelting process of metallic chromium using the ladle aluminothermic method is described,

Testing of Metallurgical Equipment on Contact Strength and Wear Resistance

The results of accelerated testing machine and mechanism parts metallurgical equipment such as bodies of rotation on the wear resistance and contact strength developed installation, showing promising applications for the production of mill rolls all weld metal.

Study Cracking Large Forgings of Low Carbon Steel Grade ST52, 3N Pressure Treatment

The paper presents an electron-microscopic analysis of structure, phase and stress-strain state of forging material. It was found out, that dislocations in ferritic grains and pearlite layers of forgings, cracked after manufacturing processes are half as large against those in standard material. Metal in this state is characterized by an increased concentration of lamellar sulfides. It is also stated that disadvantageous structural state is formed due to high concentration of carbon which causes metal over-heating both when forming and in final heat treatment.