Metallurgy
The mathematical models for dependency of consumption various materials for the removal of sulfur from the metal in the converter shop are developed. The restrictions and disturbances that affect the cost of the desulfurization process were found.
The article examines the issues associated with the use of wires with an extruded calcium metal, instead of wires with the fillers of silico-calcium brands СК40 and SK30, for the purpose of modification of inclusions in liquid steel. Information is provided about the test results of wires with calcium metal in steelmaking OJSC «BSW – Management Company of Holding «BMC».
The impact of the austenite grain growth of chromo-molybdenum steel on the kinetics of structural decomposition under continuous cooling was studied. It is shown that when the grain is enlarged with an increase in the austenitization temperature from 850 till 1050 °C, the stability of the supercooled austenite in the structure of the chromo-molybdenum steel during the decay process by the intermediate and shear mechanism increases, which contributes to a decrease in the critical quenching rate.
The influence of particle sizes and morphology of diamond synthetic micropowder of the ASM brand by a graininess 7/3 on quality of processing of carbide drawing dies is researched. The interrelation between a form of particles of diamond synthetic micropowder and their abrasive ability is established.
The problem of effective use of the alternate raw materials of metallurgical branch – shaving of ferrous metals chips is described in the article. The options of application are considered, the developed organizational and economic process promoting obtaining positive economic effect is given.
The issues of perfecting of calibrating of rolling rolls of bar stock wire roll mill 150 to increase in accuracy of the geometrical sizes of the rolled profile is considered.
One of requirements of customers in the automotive industry is the guarantee of lack of intermix of various brands of steel in a mill process of manufacture. For ensuring implementation of this requirement, it is necessary to carry out monitoring of chemical composition of each bar just before shipment, after its packing and application of the required marking. An optimal solution of this problem is application of the portable optico-emission spectrometer allowing to carry out tests of samples directly in place of location.
The testing laboratory is obliged to plan and realize the actions guaranteeing quality of the carried-out tests. The main directions of this work are:
• participation in programs of check of qualification (interlaboratory collating tests (ICT);
• application of standard samples;
• retests, encoded tests, check by other test method;
• statistical control methods.
But at the same time it is necessary to use and analyze all sources allowing to estimate quality of the carried-out tests. Such sources could be responses of consumers of production; tests, the procedures of certification of production which are carried out in independent laboratory when carrying out; the ICT organized by both the consumer, and testing laboratory.
Foundry
Modern thermal equipment could and should be energy saving, efficient, safe and environmentally friendly one. The company «TAKHTEH-RUS» LLC (Saint Petersburg) is a modern scientific and production enterprise which develops and produces energy-saving thermal units for wide range of applications.
Influence of ways of casting and influence of geometrical parameters of details made from chromic cast irons on hardness of their inner layers are investigated. The technique of researches is developed and experiments are made. Compliance of details from chromic cast irons to performance specification by hardness is determined. The microstructure analysis on the section of details is carried out.
It is shown that melting and molding of cast iron with globular graphite are complex physical and chemical nanostructural processes. The major role in these processes is played by the centers of crystallization of dendrites of graphite, graphite nanocrystals, the dissolved and adsorbed oxygen. The role of the modifying ligature of FeSiMg is reduced generally to essential decrease of concentration of the adsorbed oxygen and an enrichment of fusion by the centers of crystallization of graphite dendrites.
The article presents the results of a research of the chemical composition of brass foundry grade LS, supplied by domestic and foreign producers, as well as the chemical composition of brass lead grade LC4C used for the manufacture of stop valves. The research was made with use of optical emission spectrometers of various models and a scanning microscope. It was established that the pig delivered by the domestic producers corresponds to parameters of chemical composition for the pig’s foundry brand LS, while in the pig supplied by foreign producers there were found disparities of the chemical composition of certain basic elements. The results of the studies showed that the pig supplied by all producers, as well as the melt obtained with its use, contain in its composition such harmful impurities as S, Bi and P in the amount of 0.001%, 0.0017% and 0.0045%, respectively, that can lead to a decrease in the technological properties of products. It has been established that the use of ARL 3460 and OBLF-QSW 750 emission spectrometers and the Tescan VEGA II LMU scanning electron microscope makes it possible to obtain practically identical values of the content of the main elements and impurities in pigs of foundry and brass lead grade LC40C in studies on determining the chemical composition of the materials under study.
Science of materials
The paper presents the results of experimental studies on the surface coating of powder EuTroLoy 16006.04 with the help of plasma-powder overlaying. Analysis of the macro-structure made it possible to establish a partial absence of pores, fusions and cracks between the sub-spoon and the deposited layer. Differences in the phase composition and in the mechanical properties of the coatings were established. In places of application of plasma-powder overlaying an increase in hardness has been revealed.
Researches of procurement of ferrotitanium of Fti25 brand from waste products by method of aluminothermic synthesis are conducted. The thermodynamic analysis revealed that differences in using oxide of iron (Fe2O3) and iron cinder (Fe3O4) are subtle and it is confirmed by the experimental results. According to an elemental analysis, when using an iron cinder, the received alloy contains 18, 0–21,5 titanium and 68–73% of iron. Research of structure showed that at a crystallization of the received alloy two main phases are formed: exuberant, which is presented by dendrites with pronounced borders length of an axis of first order of a dendrite was about 250 microns and having the eutectic structure, is allocated in interdendritic space. It is established that the increase in a mass fraction of oxide of calcium in fusion mixture there is an increase in dispersion of structural components and some sferoidization, transition of an excess phase to globular.
A new mode of heat treatment, including oil quenching from temperature 1150 °C with tempering at 500–650 °С for 1,5 hours was developed. The effect of increasing the level of hardening and the heat resistance is determined by more complete dissolution of the steel matrix, the coarsening of grains and morphology of the primary phase of the structure and as a result of high temperature heating and increasing of the number of secondary phases as a result of the tempering. The results of the work could be used in production of working parts is highly resourceful tool for heat forming.
The advantages of the system of awarding of staff on key performance indicators are considered. The structure of formation of motivation on the basis of KPI. The main tasks when building a bonus system on the basis of KPI. Justification the use of key performance indicators in the enterprise is made. The scheme of construction of system of motivation of personnel KPI is proposed.
Organization of Labour
The advantages of the system of awarding of staff on key performance indicators are considered. The structure of formation of motivation on the basis of KPI. The main tasks when building a bonus system on the basis of KPI. Justification the use of key performance indicators in the enterprise is made. The scheme of construction of system of motivation of personnel KPI is proposed.
The indicator of labor input is considered. Connection of labor input and labor productivity is given. Major factors of decrease in labor input are formulated. Necessity of continuous decrease in labor input is proved. Options of organizational – technical actions to reduce labor input on an example the steel-wire shops of OJSC «BSW» – Management Company of Holding «BMC» are offered.
The advantages and disadvantages of centralization of the labor service division in the enterprise are considered in the article. Optimization of the number of labor service division of enterprise, tasks of the centralization of labor service are studied.
Boron is one of the available chemical elements actively influencing the properties of the alloys. The main use of boron is in the alloys of the control rods of nuclear reactors to stop or slow down the fission reaction.
Erbium is used as a component of magnetic alloys; oxide of erbium is used in nuclear power to improve energy distribution and safe operation of a nuclear reactor.
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