Method for determining tundish outlet concentration through steel ingot multi-tundish concentration-changing continuous pouring
A tundish and variable concentration technology, applied in the field of tundish metallurgy, can solve the problems of low accuracy, large workload and long calculation time, and achieve the effects of high accuracy, small workload and simple method
Active Publication Date: 2014-01-22
TSINGHUA UNIV
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Problems solved by technology
At present, there are two methods of numerical simulation and physical simulation to study the outlet concentration of the tundish. The numerical simulation method is based on the physical parameters of molten steel and the basic equations of flow and diffusion. Through numerical calculation, the flow process of molten steel and the The distribution of carbon solute concentration, however, the numerical simulation method has a large amount of calculation, low accuracy, and long calculation time
The physical simulation method is to simulate molten steel through an aqueous solution, simulate the flow of molten steel in the tundish in the plexiglass cavity, and measure the concentration of solute in the aqueous solution through a salinity meter, etc. However, the physical simulation method is complicated to operate and the workload is heavy Big
At present, there is no method for theoretical calculation of tundish outlet concentration
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Embodiment 1
[0057] 1. Tundish prototype and actual pouring process
[0058] Simulate the multi-ladle casting process of 438 tons of steel ingots actually produced by a certain factory. The actual size of the tundish is Φ3200mm×3200mm. The multi-pack variable concentration pouring process is as follows: the first bag pours 90 tons, the carbon concentration is 0.33%, and the pouring time is 20 minutes; the second bag has a carbon concentration of 0.30%, pours 90 tons, and the pouring time is 20 minutes; the third bag has a carbon concentration of 0.26%, Pouring 105 tons, the pouring time is 24 minutes; the fourth bag has a carbon concentration of 0.20%, pouring 155 tons, and the pouring time is 34 minutes; the empty bag stage is 12 minutes. The total pouring time is 110 minutes, and the average pouring flow rate is Q C It is 573L / min.
[0059] 2. Tundish model and simulate pouring process
[0060] (1) Make the tundish model according to the reduction ratio n=8, then the size of the tund...
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The invention provides a method for determining tundish outlet concentration through the steel ingot multi-tundish concentration-changing continuous pouring. The method comprises the steps that firstly, similarity parameters of a tundish original model and a tundish model are determined; secondly, simulated pouring is carried out, the simulated pouring stopping time tmax of the tundish model is determined, and the concentration c (t) of solute at an outlet of the tundish model is measured to obtain a tundish stopping time distribution curve, namely the RTD curve; thirdly, the area percentage function f(t) of the tundish model is determined according to the RTD curve; fourthly, the area percentage function F(T) of the actual pouring time T corresponding to the tundish original model is determined according to f(t); fifthly, the outlet concentration of the tundish original model through the continuous pouring is regarded as the time overlapping of the RTD curve, and the outlet concentration changing of the tundish original model through the multi-tundish concentration-changing continuous pouring is calculated. The RTD curve is obtained through the one-time experiment to analyze the outlet concentration of the tundish original model, the method is reliable, and compared with a numerical simulation method and a physical simulation method, the method is little in workload and high in accuracy.
Description
technical field [0001] The invention relates to the field of tundish metallurgy, in particular to a method for determining the outlet concentration of a tundish under multi-concentration variable-concentration continuous casting of steel ingots. Background technique [0002] Large steel ingots generally have a mass of tens to hundreds of tons. Energy and electric power, metallurgical machinery, ship engineering and other industries urgently need large forgings, and the manufacturing capacity of large forgings is an important symbol to measure the level of an equipment manufacturing industry. As the blank of large forgings, the quality of large steel ingots determines the quality of large forgings. However, the greater the mass of the ingot, the more serious the segregation problem inside the ingot, and even lead to the scrapping of large forgings. An important quality defect in large steel ingots, especially in super large steel ingots over 100 tons, is macro segregation, ...
Claims
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Inventor 康进武董超
Owner TSINGHUA UNIV