Ідеологія коригування хімічного складу синтетичного чавуну в процесі виготовлення литва
It is shown that one of the urgent tasks in the field of theory and technology of foundry production of synthetic cast iron, designed for the manufacture of parts of railway rolling stock (brake pads, friction “Khanin wedge”), is the further development of ideology, system, algorithm for adjusting c...
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| Date: | 2023 |
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| Main Authors: | , |
| Format: | Article |
| Language: | Ukrainian |
| Published: |
Physico-technological Institute of Metals and Alloys
2023
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| Subjects: | |
| Online Access: | https://www.metalsandcasting.com/index.php/mcu/article/view/84 |
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| Journal Title: | Metal and Casting of Ukraine |
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Metal and Casting of Ukraine| Summary: | It is shown that one of the urgent tasks in the field of theory and technology of foundry production of synthetic cast iron, designed for the manufacture of parts of railway rolling stock (brake pads, friction “Khanin wedge”), is the further development of ideology, system, algorithm for adjusting calculation and optimization of cast iron in the process of its melting. Based on the results of the study of the chemical composition of synthetic cast iron smelted in an industrial 3-ton induction furnace at the plant LLC "M-LYT" (Nikopol, Ukraine), it is established that the introduced technology guarantees the requirements of standards for chemical composition and mechanical properties of these products. The ranges of content of C, Si, Mn, P, S in cast iron are significantly narrower than regulated by standards. The share of S in the composition of cast iron does not exceed 0.05 %. Histograms of the density of distribution of these elements are presented, calculated from the actual data of statistical processing of a sample of more than 200 batches of synthetic cast iron in the manufacture of brake pads type “M” for locomotives according to GOST 30249-97 and GOST 33695-2015 and “Khanin wedge” according to requirements of DSTU 8833:2019. Approaches to calculation of necessary volumes of additives of alloying and modifying materials in molten cast iron at adjustment of its chemical composition are offered. Aiming points are determined from the ranges of chemical elements in the composition of cast iron regulated by normative documents when determining the required number of components added to the melt. A rational sequence of operations in the procedure of refining the chemical composition of cast iron to the specified conditions is recommended. It is proposed to take as a criterion for optimizing the chemical composition of cast iron an indicator of economic efficiency of the production process of cast iron and iron products. Ways to minimize the cost of smelting synthetic cast iron are considered. |
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