Application of microcrystalline complex modifiers for steel ladle treatment. Part 1. The role of nonmetallic inclusions in steel quality forming
| Autor: | I. V. Bakin, A. Ya. Dynin, V. A. Golubtsov, O. N. Romanov, A. A. Prydko, I. V. Ryabchikov |
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| Rok vydání: | 2021 |
| Předmět: |
Liquid metal
Ladle Materials science 020502 materials Metallurgy 0211 other engineering and technologies Oxide 02 engineering and technology law.invention chemistry.chemical_compound 0205 materials engineering chemistry Casting (metalworking) law Smelting Crystallization Liquation 021102 mining & metallurgy Eutectic system |
| Zdroj: | Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information. 77:295-309 |
| ISSN: | 2619-0753 0135-5910 |
| Popis: | Contamination of steel by nonmetallic inclusions (NI) has a negative effect on mechanical characteristics of metal used under no favorable conditions. Conditions of NI forming in the process of steel smelting, ladle treatment and casting considered. It was shown that it is impossible to get rid of many NI. However, the task of forming less “harmful” NI having minimal effect on the decrease of finished products indices is quite practicable. To refine steel of NI it is reasonable to accomplish operations in a melt to modify NI morphology from dangerous acute-angled aluminous to globular oxide-sulphide. This task can be solved by introduction into metal complex modifiers comprising calcium, barium, strontium and rare earth metals. Addition of complex modifiers is a good alternative to complicative and long-time operations to decrease NI general content to lower levels, for example, by long-time metal ladle treatment. Application of the method enables in some situation to avoid expensive operations related to deep metal desulphuri zation and its dehydronization. Clean steel production becomes considerably easier at application of multicomponent alloys, obtained by a technology of accelerated crystallization. Application of such compositions results in forming globular oxide and oxide-sulphide compounds, as well as eutectics with low-melting point, which are comparatively quickly removed out of liquid metal. At that due to decreasing of liquation processes forming in the liquid metal, higher quality of large ingots and work-pieces, obtained from 420 t mass ingots can be reached. |
| Databáze: | OpenAIRE |
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