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Registration Number

0216U006964, 0115U004940 , R & D reports

Title

Research and development of methods of physical and chemical influence on the processes of smelting, secondary treatment, casting and crystallizatio of steel.

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Head

Makurov Sergey Leonidovich, Доктор технічних наук

Registration Date

04-08-2016

Organization

State Higher Educational Institution "Pryazovskyi State Technical University"

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The types of modifiers and methods of their introductionto liquid steel are analysed It is set that is most effective introduction to metallic fusion of powder-like wire with a modifier. The most widely used modifier is a silicocalcium. Efficiency of the use of cored wire with a silicocalcium depends on many parameters: to speed of introduction of cored wire, temperature of fusion, thickness of steel shell of cored wire, presence of slag fusion on the surface of liquid steel and so on... It is set that the most effective method of treatment of metallic fusion is his introduction to mold of continuous casting machines, that allows substantially to bring down the charges of modifier as rare earth metals from 2-3 kg/of t to 0,3-0,4 kg/of t became . Influence of treatment of metallic fusion is analysed on the level of physical, chemical heterogeneity of the cast metal. Technology of treatment of metal is offered to mold of continuous casting machineswith the use of nomogram that allows to choose speed of introduction of cored wire taking into account the different technological parameters of casting. It is set during research of terms of forming of largest forging ingot, that at their transporting to the heater stoves the surface of ingot can be below than critical, that will result in formation of cracks. This temperature is a derivative from time of complete consolidation of bar and dependence of temperature of his surface during self-control in mould. A mathematical model is offered for the calculation of the thermal state of ingots, that additionally takes into account these experimental enthalpy in area of the diphasic state became data on the change of temperature of external surface of mould. The calculations of necessary parameters of forming of largest forging ingot were executed with the use of PC. It is set that self-control in moulds of largest forging ingot can be brief approximately on a hour. Thus for transporting of ingots with the purpose of decline of thermal losses it is expedient to use carriages-thermoses. Research of work of two converters is executed on Azovstal Iron and Steel Works with the purpose of establishment of intercommunications of results of chemical analysis of metallic fusions with the use of self-reactance statistics. It is set that the values of criterion of Shapiro-Wilkie are near on a lone person with subzero authenticity of casting-out of null-hypothesis (р<0,02) for variables [C],[Mn], [S],[P] both converters. It is set a calculation, that diagrams of scope for variables ((T, oC), [C],[S],[P]), answer distribution of variables under the law of normal distribution. At the same time distribution of variables [Mn] and a[O], it is appraised by the same method of law of normal distribution does not answer. It is set, for variables (T оC) and [C] a hypothesis about equality of dispersions can not be accepted. Calculation of comparison middle conducted on methodology of values of t - criterion with the separate estimations of dispersions. The results of calculation show that mean values of variable [C] meaningfully differ for fusions of both converters : 0,044 and 0,037 % accordingly. At the same time the mean values of variable (T, оC) do not differ meaningfully. It is shown that hypothesis of equality of dispersions for variables [P] and [S] confirmed - the values of variables belong to the the same general aggregates. Value middle for these variables: 0,0079 and 0,0085 % for a variable [P], and for a variable [S] 0,0134 and 0,0128 % accordingly for the first and second converters and does not differentiate meaningfully. The use of criterion Sends-Whitney for the case of the use of method of non-parametric statistics specifies on absence of meaningful differences in values middle for the variable of a[O] . However, differences middle for a variable [Mn] appeared meaningful. Research of influence of external factors is executed on the process of desulphurizing of metal during smelting of metal in a vacuum induction furnace. It is set that at treatment of ball-bearing steel became there is possibility substantially to decrease content of sulphur in a metal to 0,006% in VIF. Use area - steel industry .

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Бондар Владислав Іванович
Бурлаков Віктор Іванович
Макуров Сергій Леонідович
Тарасюк Леонід Іванович

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2020-04-02