Production method of high-cleanliness high-titanium low-carbon steel

Abstract

The invention relates to a production method of high-cleanliness high-titanium low-carbon steel, belonging to the technical field of iron and steel metallurgy. The technical problem to be solved by the invention is that when the titanium content is high, the steel quality becomes poor, the cleanliness is low, and the quality of the final product produced is low. The invention provides a production method of high-cleanliness high-titanium low-carbon steel, which is produced according to the converter-RH-argon-blowing-slab continuous casting process flow, the end point of the converter is controlled, the converter is tapped, and the RH deoxidizes and alloys the molten steel step by step. During the tapping process, high-titanium and low-carbon steel refining slag is added to the ladle to make slag and the ladle slag composition is controlled. Mold slag is used in the pouring process, and the titanium content in the steel is 0.15‑0.8% by mass fraction. The invention can realize the smooth pouring of high-titanium low-carbon steel, and auxiliary materials such as ladle slag, tundish covering agent and mold slag have a good ability to absorb non-metallic inclusions, and the performance can still remain stable after absorbing a large number of inclusions. The cleanliness of the molten steel is high, and the quality of the poured slab is good.

Description

technical field

[0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a production method of high-cleanliness high-titanium low-carbon steel. Background technique

[0002] Titanium is a good deoxidizer and an effective element for fixing nitrogen and carbon in steel. The application of titanium in steel is mainly based on microalloying. Adding a certain amount of titanium (0.01% to 0.03%) in steel can refine the structure of steel, improve the strength of steel, and improve the plasticity and impact toughness of steel. And so on. With the increase of titanium content in steel, the toughness, processability and wear resistance of the product are greatly improved, especially when Ti≥0.15% in steel, a large amount of micron-sized (1-5μm) TiC (≥80% ) and a small amount of TiN, the wear resistance of the product is more than 10 times that of titanium microalloyed steel, and the service life of the product is significantly...