Advanced Materials and Engineering Applications by Edited by Jiatao Zhang

By Edited by Jiatao Zhang

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Composition of Clean steel Production System Shougang Jingtang steelmaking plant, through analysis and integration of each procedure of steelmaking-continuous casting and in accordance with the design concept of hot metal “full-3-removal” established a dynamic, orderly, compact, continuous, high efficient and stable clean steel production system. Steelmaking plant is equipped with 4 KR hot metal desulphurization facilities, two 300t converters for hot metal desilicification - dephosphorization pretreatment, three 38 Advanced Materials and Engineering Applications 300 high efficient converters, one multi-function LF, two multi-function RH, two CAS molten steel secondary refining facilities and three high efficient slab CCM, established a optimized production process of hot metal short flow–hot metal pre-treatment→ high efficient converter smelting→ secondary refining→ high efficient continuous casting.

Through the analysis and integration of converter smelting function, in order to further increase production efficiency and molten steel cleanliness, converter staged smelting concept is adopted, traditional converter integration of desilicification, dephosphurization and decarburization is changed to dedicated converters for hot metal desilicification and dephosphurization pretreatment, while top and bottom compound blown converter is used for decarburization and heating up only, thus the metallurgical reaction efficiency and molten steel cleanliness is further increased.

Compatibility of the analytical model with approximations for “temperature integral”. For non-isothermal transformation with constant heating rate, to derive an analytical model, the term called the “temperature integral” has to be approximated. ∫ T 0 exp(− Q RT ′)dT ′ = RT 2 Q exp(− Q RT ) (8) For Q/RT>>1, Eq. (8) holds without introducing large error. This approximation leads to the original analytical model [5]. Recently, many approximations for “temperature integral”, which are more accurate than Eq.

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