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Anastasiia Zelena

1. PRYDNIPROVS’KA STATE ACADEMY OF CIVIL ENGINEERING AND ARCHITECTURE. Anastasiia Zelena D evelopment of I nserts P rocessing and Casting T echnology from X34Cr20Mo10Si10V ( 4 H 5 MFS ) S teel SCIENTIFIC SUPERVISOR: Ph.D. assoc. prof. O. Uzlov

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Anastasiia Zelena

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  1. 1 PRYDNIPROVS’KA STATE ACADEMY OF CIVIL ENGINEERING AND ARCHITECTURE • Anastasiia Zelena • Development of Inserts Processingand Casting Technology from X34Cr20Mo10Si10V (4H5MFS)Steel • SCIENTIFIC SUPERVISOR: Ph.D. assoc. prof. • O. Uzlov • LANGUAGE SUPERVISOR: lect. M.Nedogibchenko • Purpose of the work:Explore the possibility of obtaining high-quality product from recycled material of X34Cr20Mo10SiV ( 4H5MFS) steel • Tasks of research: • To develop the most rational scheme of melting contaminated packed cutting • To find the best strategy of the steel casting • To examine the quality of finished product’s material after the final heat treatment

  2. 2 The process of mechanical treatment develops thousands of tons of cutting from steel X34Cr20Mo10SiV (4H5MFS). A problem of its usage is very urgent in Ukraine, which possesses limited sources of raw materials. Hard working conditions require high range of properties of steels which the stamps are made of: 1. Heat resistance. 2. Necessary impact strength. 3. High crazing resistance. 4. Hardenability. 5. Oxidation resistance.

  3. Table 1 Chemical composition of researched material. Wt, % 3 Material and methods of researches The investigation of microstructures were held with the help of light microscopes Neophot 2 and Neophot 2.1 Fig.1. Neophot 2.1 Measurements of microhardness were held by Vickers method in accordance with GOST 9013-59 on PMT-3 device at loading of 5 kg. Measurements of hardness were held by Rockwell methodon ТР-003 Fig. 2. PMT-3

  4. The experimental part 4 Quality estimation of product’s material from steel X34Cr20Mo10SiV manufactured on the metallurgical enterprise and made by centrifugal casting. A) х1000 B) х1000 Fig. 3 Typical nonmetallic inclusions in X34Cr20Mo10SiV (4H5MFS) steel structure, A) obtained by industrial smelting, B) obtained by centrifugal casting

  5. 5 Microhardness of dark areas is 423 HV,microhardness of light areas is 500 HV Microhardness of dark areas is 428 HV,microhardness of light areas is 478 HV А) х25 B) х25 Fig.4 Structural heterogeneity A) in the industrial steel X34Cr20Mo10SiV (4H5MFS); B) in centrifugal cast steel

  6. 6 Observation of hardness over the cross- section of a product in two perpendicular directions have not revealed an essential difference in hardness of surface and deep layers : A) 43-45 HRC; B) 45-47 HRC А) х1000 B) х1000 Fig. 5 Microstructure of A) industrial steel X34Cr20Mo10SiV (4H5MFS) and B) centrifugal smelt steel after standard heat treatment.

  7. 7 B) х1000 А) х400 In the industrial steel any sulfides have not been revealed Occurrence of these inclusions can be explained by pollution of initial charge (packed cutting) by various chemical compounds containing sulfur. Fig. 6 Inclusions of sulfides in X34Cr20Mo10SiV(4H5MFS) steel structure obtained by centrifugal casting

  8. Cost efficiency 8 Cost standards and value of alloying materials P = R – C P - profitfor 1 ton of steel, UAH R - revenues from sales, UAH C - steel manufacturing cost, UAH P = 36330-20509,9 = 15820,1 UAH Pt = (P - Сs) * Vс Cs - steel smelting cost, UAH Vc - annual cutting volume, ton Pt – total profit, UAH Pt = (15820,1-6000) * 17,5 = 171851,75 UAH

  9. Conclusions: 9 1. Comparative estimation of structural characteristics deformed and centrifugal cast metal allows to draw a preliminary conclusion on their similarity. 2. Experimental metal tends to improvement of morphology of nonmetallic inclusions, structural homogeneity and microhardness, but concedes on austenite primary grain size and on sulfides presence in structure. 3. The distinction of structural characteristics cannot essentially affect durability of products, which should be estimated by results of operational tests in conditions of manufacture. 4. Advanced material not only does not concede on the properties primary, but also in some cases exceeds them. 5. The economy of Ukraine requires resolute actions on usage and processing of secondary raw material in manufacture with a view of economy and rational utilizing resources of the country. 6. Usage of the second raw material as a charge for stamp instrument producing will bring annual income around 170000 UAH.

  10. THANK YOU FOR YOUR ATTENTION

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