To improve the utilization of steel scrap in the steel production process, the authors analyze the feasibility of adding scrap steel into the multifunctional ladle before hot metal tapping. Firstly, the authors provide an overview of the process. Secondly, theoretically study the melting process of scrap steel in the ladle along with the scrap steel melting mechanism is done. Finally, the effects of the addition of different types of scrap steel pretreated at various temperatures are examined using numerical calculation and simulation. The preheating temperature and specific surface area of the scrap steel had important effects on scrap steel melting. For the scrap steel with a specific surface area of 1.6 m 2 t À1 , the melting rate decreased by 4 min t À1 as the preheating temperature was increased from 300 C to 800 C. For a preheating temperature of 800 C, the melting rate increased by 4.5 min t À1 as the specific surface area increased from 3.3 to 26.1 m 2 t À1 . Another 2.2%-6% of scrap steel can be added under certain conditions. This approach provides an effective solution to the problem of melting large amounts of scrap steel in steel works, further increases the utilization of scrap steel during steel production, and reduces the cost of steel production.
Profile of the screw rotor comprised of varieties of curves is characterized by complexity and asymmetry. Determination of the billet diameter has a significant influence on the quality of the driven rotor formed by fixed cross rolling. Owing to this the general equation to determine the area of the complex tooth has been presented. Then detailed calculations of the spiral teeth volume and the sectional area of the driven rotor have been carried out. Satisfactory result that the relative error is less than 0.002% has been demonstrated by comparison of theoretical calculation and measurement result to verify the accuracy of the proposed theoretical calculation.
Based on the theory of target curve, a method of improving flatness target curve is proposed. The transverse temperature distributions of strip are measured and described with a biquadratic expression, and the statistics method is used to analyze the temperature distributions. Finally, the additional temperature stress compensation is calculated to improve the strip shape.
For gaining strip edge drop controllability and increasing roll grinding precision, the edge drop control work roll (EDW) was developed and designed in 1700 mm tandem cold rolling mill. During the rolling trial, the roll configuration between EDW and conventional backup roll didn’t match well because of the large fluctuation of strip edge drop, the lower shape control ability and non-uniform roll wearing, so the new roll configuration between EDW and varying contact backup roll (VCR) was proposed. After analyzing by finite element model, the result showed that the roll system configuration of VCR and EDW was better by 10.7% larger roll gap crown adjustable scope, 19.1% larger roll gap stiffness characteristics and 21.6% smaller pressure peak between rolls than before. The new roll system configuration has been applied to 1700 tandem cold rolling mill at WISCO after industrial testing.
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