Method for controlling triangular area cracks of continuous casting plain carbon steel slab

Abstract

The invention discloses a method for controlling a triangular area crack of a continuous casting plain carbon steel slab, which belongs to the technical field of continuous casting slabs, and comprises the following steps: S1, keeping the wide surface water flow of a crystallizer at 3200L / min, controlling the narrow surface water flow of the crystallizer at 510L / min-600L / min, calculating the narrow side and wide surface heat flux according to a heat flux formula of the crystallizer in combination with the water inlet and outlet temperature difference of the crystallizer, meanwhile, the cooling water flow of the foot roller section of the crystallizer is increased by 10-30 L / min, a database is established, and data with the heat flux density ratio of the narrow side to the wide side being 0.8-1.0 MW / m < 2 > is selected; s2, measuring the surface temperature of an inlet and an outlet of the straightening section of the casting blank, firstly, establishing a database according to the measured temperature and the optimized secondary cooling water specific water flow, and selecting data of the straightening section at the temperature of 910-930 DEG C from the database; secondly, an arc-shaped section nozzle of the casting machine is changed into a backwashing nozzle, so that the temperature return amount is less than 20 DEG C;

Description

technical field [0001] The invention belongs to the technical field of continuous casting slabs, and in particular relates to a method for controlling cracks in the triangular area of ​​continuous casting ordinary carbon steel slabs. Background technique [0002] At present, among the internal crack defects of continuous casting slabs, triangular cracks are one of the common defects, which have a great impact on the quality of the slab, and easily lead to delamination and cold bending cracking after rolling. However, there are few studies on triangular cracks. The following are some researchers' views on the generation and improvement of slab triangular cracks: [0003] Wang Xinhua (Wang Xinhua, Method for controlling cracks in the triangle area of ​​continuous casting slabs, patent number: 200610137894.4) researched that optimizing the taper and opening of the narrow face of the mold, and using strong cooling on the foot rolls are beneficial to improve the cracks in the tri...

AI Technical Summary

Problems solved by technology

[0007] The invention provides a method for controlling the cracks in the triangular area of ​​the continuous casting ordinary carbon steel slab, aiming to solve the problem of improving the cracks in the triangular area of ​​the continuous casting ordinary carbon steel slab

Images