A steelmaking process for controlling porosity defects in continuous casting slabs

Abstract

The invention relates to a steelmaking process for controlling the pore defects of continuous casting slabs, which is characterized in that it includes: step 1, transporting the ladle containing the molten steel for refining to the turntable, and turning the turntable to the casting position, and turning the steel The liquid is injected into the tundish; step 2, detect the height of the molten steel liquid level in the tundish, adjust the opening of the nozzle of the tundish according to the height of the liquid steel level, and the tundish distributes the molten steel to several crystallizers through the nozzle. The crystallizer is provided with a submerged nozzle, and argon gas is passed into the submerged nozzle to seal the nozzle; step 3, the molten steel is preliminarily formed into a billet in the crystallizer, and the mold lowers the billet to In the pipeline, the steel billet is subjected to secondary water cooling in the pipeline; step 4, pulling and straightening rollers pull the steel billet after secondary water cooling out of the pipeline; step 5, the cutting device cuts the steel billet according to the required length of the casting billet. The invention intelligently adjusts the amount of argon blowing through the control module, thereby reducing bubble defects in the continuous casting slab.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a steelmaking process for controlling the pore defects of continuous casting slabs. Background technique [0002] The quality of the continuous casting slab is an important factor affecting the qualified rate of the final product and the production cost. Ensuring good quality of the continuous casting slab is a prerequisite for hot delivery, hot charging and direct rolling. Bubble defects are one of the common defects in casting slabs, which often cause the casting slabs to be unqualified in flaw detection. [0003] During the casting process of molten steel, due to the rapid flow of molten steel, negative pressure will be formed near the bowl of the nozzle, and air will be sucked in, causing secondary oxidation of molten steel, which is a common cause of bubble defects. In order to avoid the inhalation of air, a seal is usually set on the bowl of the nozzle, and argon gas i...

AI Technical Summary

Problems solved by technology

[0004] For this reason, the present invention provides a steelmaking process for controlling the porosity defects of continuous casting slabs, so as to overcome the problem in the prior art that bubble defects still often occur due to manual adjustment of the amount of argon gas injected.