An important factor in improving the quality of stainless steel is continuous casting

The continuous casting of stainless steel not only increases the yield of molten steel, thereby increasing the overall yield but also cooperates with refining outside the furnace to significantly improve production efficiency and omit the blanking process, saving a lot of energy consumption. Stainless steel continuous casting is generally matched with a refining furnace, which has strict requirements on the chemical composition and temperature of the molten steel; to prevent secondary oxidation of the molten steel, non-oxidation protective pouring is required during the continuous casting production process; the molten steel ladle, tundish, and sliding nozzle, immersed nozzles and other refractory materials have strict requirements; to ensure the surface quality of the continuous casting billet, select appropriate protective slag; the vibration marks formed on the surface of the continuous casting billet due to the vibration of the crystallizer during the continuous casting process must be controlled; iron Electromagnetic stirring must be used during continuous casting of solid stainless steel.

Stainless steel generally uses the same vertical, vertical bending, or arc continuous casting machines as carbon steel. The refined molten steel is poured into the ladle, and the temperature of the molten steel is fine-tuned by the argon blowing station before being lifted to the ladle rotary table to wait for continuous casting. After the previous ladle of molten steel is cast, the ladle to be cast is moved to the top of the tundish injection port through the rotary table, and then the molten steel is injected into the tundish through the long nozzle. The molten steel in the tundish enters the crystallizer through the immersion nozzle to be formed and condensed and then moves downward continuously. The surface solidified cast slab continues to be rapidly cooled through the secondary cooling section until the core of the slab becomes solid, and then flame-cut to a fixed length to complete the entire continuous casting process.

Changing stainless steel molten steel from ingot casting to billet casting can not only increase the yield rate by 10%, save energy, and shorten the production cycle, but also has become a necessary means to improve product quality due to the improvement of quality control methods in the continuous casting process. The quality advantages of stainless steel continuous casting billets are concentrated in the fact that the non-grinding rate of the outer surface of the billet has reached more than 70%, except for the head and tail sections, and the total surface grinding yield has reached 9915%. To achieve this goal, the molten steel must be refined to achieve lower oxygen and sulfur content, the metallurgy of the large ladle and tundish must be properly controlled, the temperature of the molten steel must be precisely controlled, and oxidation-free pouring must be achieved to further reduce the inclusion content. Under this condition, the vibration process of the crystallizer is matched with the mold powder according to different steel types, so that the depth of vibration marks on the surface of the slab reaches 200 μm, thus achieving the goal of rolling the stainless steel slab surface without basically grinding.