Improved casting process of high-carbon steel in production of billet continuous casting

Abstract

The invention discloses an improved casting process of high-carbon steel in the production of billet continuous casting. The casting process comprises the following steps that (1), the installation ofa long nozzle is improved, the installation quality of the long nozzle is improved, and the deviation of the long nozzle is avoided; (2) a tundish and long nozzle argon blowing device is adopted to guarantee that molten steel in the tundish is slightly overturned in the argon blowing process, and the phenomenon that the molten steel is splashed is not allowed; (3) a slag blocking wall is adoptedin the tundish; (4) the tapping temperature is controlled at 1595+/-10 DEG C; (5) reasonable ladle operation is adopted, and the temperature is lowered at the speed of lower than or equal to 3 DEG C per minute; and (6) the use of a tundish covering agent is enhanced, wherein the covering agent is a carbon-free magnesium oxide covering agent, and the adding amount is 0.6kg per ton of molten steel.According to the improved casting process, the removal of inclusions is facilitated, the control over the superheat degree of the molten steel is enhanced, the use of the tundish covering agent is enhanced, the surface quality and the internal quality of the continuous casting blank are improved, and the market competitiveness of the product is improved.

Description

technical field [0001] The invention relates to a pouring process for steelmaking, which belongs to the improvement of the pouring process for producing medium-high carbon steel by continuous casting of billet, in particular to an improved pouring process for producing medium-high carbon steel by continuous casting of billet. Background technique [0002] With the changes in the international steel market environment, how to use limited steel scrap resources to produce high-quality, high-value-added products has become a problem that every steel company must tackle. Through the implementation of medium and high carbon steel technology, through the application of MEMS (electromagnetic stirring) technology, the application of continuous casting full protection pouring technology, the application of tundish slag blocking technology, solve the subcutaneous air bubbles, surface air bubbles, and obvious edge cracks of the slab, etc. The proportion of axial crystals is small, the p...

AI Technical Summary

Problems solved by technology

[0003] At present, the continuous expansion of billet continuous casting long products has put forward higher requirements for the quality of continuous casting billet, especially the surface and internal quality, and now casting uses mold electromagnetic stirring (MEMS) and billet solidification end electromagnetic stirring ( After FEMS), because it is impossible to determine the best mixing parameters for each steel type, it cannot meet the production requirements of high-quality steel types. Quality defects such as center segregation, center porosity, and shrinkage cavities of medium- and high-carbon steel types occur during the rolling process. Center hardness abnormalities, Cracks during cold drawing, cup and cone fractures during wire drawing, and reduced fatigue life