A three-strand slab continuous casting tundish diversion structure and manufacturing method

Abstract

A three-strand slab continuous casting tundish distribution structure and a manufacturing method thereof belong to the technical field of steelmaking continuous casting tundish equipment, and are used to reasonably control the flow form of molten steel in the tundish. The technical solution is: the diversion island is located in the middle of the tundish, there are steel flow channels between the front, back, left side, right side of the diversion island and the opposite inner wall of the tundish, the front of the diversion island and the front of the tundish There are two parallel diversion island retaining dams in the molten steel flow channel between them. There are diversion island retaining walls in the steel flow channel between the left side and right side of the diversion island and the opposite tundish side respectively, and the two ends of the tundish There are tundish retaining dams respectively. The invention can eliminate the breakdown flow at the bottom of the tundish, significantly prolong the average residence time of molten steel, reduce the dead zone in the tundish, increase the plug flow area, and can effectively balance the temperature of each flow, forming a structure that is beneficial to the floating of inclusions. , Each stream tends to a uniform flow pattern, which improves the purity of molten steel.

Description

technical field [0001] The invention relates to a three-strand slab continuous casting tundish island diversion structure and a manufacturing method, belonging to the technical field of steelmaking and continuous casting tundish equipment. Background technique [0002] With the improvement of market requirements for steel quality, the metallurgical effect of continuous casting tundish is becoming more and more obvious. At the same time, as a typical non-isothermal reactor, the non-isothermal process of tundish is also highly valued. For a multi-flow tundish, a reasonable flow control device can effectively prolong the average residence time of molten steel, reduce the temperature difference of molten steel at each outlet, and play a vital role in improving the flow field and temperature field in the tundish. [0003] At present, the three-strand slab tundish does not use any flow control device, only tundish prefabricated parts such as slag retaining wall, flow stabilizer, a...

AI Technical Summary

Problems solved by technology

[0003] At present, the three-strand slab tundish does not use any flow control device, only tundish slag retaining wall, flow stabilizer, retaining dam and other tundish prefabricated parts, these parts can play the role of separating steel slag and molten steel, but cannot solve the following Problems: There is obvious short-circuit flow in the middle flow of the three-flow slab; the average residence time of molten steel in the entire tundish is short; the plug flow area is small and the dead zone volume is large; the removal effect of inclusions is poor; very uneven temperature distribution

These problems are not conducive to the uniformity of temperature and composition of each stream, as well as the floating and removal of inclusions, which are not conducive to stabilizing the continuous casting process and improving the quality of the slab

[0004] Since the current world and domestic third-rate slab tundishes only use prefabricated parts such as retaining walls, retaining dams, and flow stabilizers, they can only play the role of separating steel slag and molten steel. Therefore, the volume fraction of plug flow in the tundish is 11.64%, and the dead zone The volume fraction is 32.66%, and the ratio of the plug flow volume to the dead zone volume is 0.36. This situation shows that the plug flow volume of molten steel in the tundish is small, the dead zone volume is large, and the flow pattern is unreasonable

[0005] To sum up, the flow pattern of molten steel in the current three-strand slab tundish is unreasonable, the average residence time difference and the shortest response time difference of each flow in the tundish are large, and each flow is very unbalanced, which hinders the reasonable flow of molten steel in the tundish. flow, which also affects the quality of the slab, needs to be effectively solved urgently

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