Secondary Metallurgy

After tapping steel from a primary steelmaking furnace such as BOF or EAF, the molten steel for high quality or specialty applications is subjected to further refining to produce high grades of steel where the range in chemical composition and consistency is narrow. Secondary metallurgy plays a crucial role in enhancing the properties of the metal by fine-tuning its composition, temperature and removing impurities. Among the key processes in secondary metallurgy are the Ladle Refining Furnace (LRF) and the Argon Oxygen Decarburization (AOD) process, which are instrumental in achieving desired steel grades with specific mechanical and chemical characteristics. Carmeuse lime products and blends play a key role in reaching these objectives.

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LRF PROCESSES

Refining in the Ladle Refining Furnace (LRF) is the last but the most important stage of the steel melting process. This stage gives a final chance to refine the steel and adjust both its chemical composition and temperature. Slag composition is of great importance and there should be no compromise on the selection of fluxes, ensuring the highest quality possible. Carmeuse lime products or blends are efficiently contributing to steel refining by removing remaining impurities like sulphur and protecting refractories.

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ARGON OXYGEN DECARBURIZATION

Argon Oxygen Decarburization (AOD) process is used in stainless steelmaking containing oxidizable elements such as chromium. Carmeuse high quality lime with low C content is required for achieving optimum deoxidation and desulphurization without interfering decarburization.

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