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Common sense problems of stainless steel pipe fittings

Shandong Xinhe International Trade Co., Ltd.2022-05-12
The quality advantages of stainless steel pipe fittings continuous casting billet products are concentrated in that the non-grinding rate of the outer surface of the billet except the head and tail sections has reached more than 70%, and the total surface grinding yield has reached 99.15%. To achieve this goal, it is necessary to refine the molten steel. To achieve lower oxygen and sulfur content, do a good job in the metallurgy of large ladle and tundish, control the temperature of molten steel, realize non-oxidative casting, and further reduce the content of inclusions.


The specific steps of the continuous casting process of stainless steel pipe fittings are as follows:


1. According to different steel grades, the vibration process of the mold is matched with the mold slag, which can increase the yield by 10%, save energy and shorten the production cycle, thereby improving the yield of molten steel.


2. Continuous casting should be used for stainless steel pipe fittings, thereby improving the comprehensive yield, and in conjunction with the refining outside the furnace, the production efficiency is significantly improved, and the billeting process is omitted, which saves a lot of energy consumption.


3. Continuous casting of stainless steel pipe fittings is generally matched with refining furnaces, and has strict requirements on the chemical composition and temperature of molten steel; in order to prevent secondary oxidation of molten steel, non-oxidative protection pouring is required in the continuous casting production process; Strict requirements for refractory materials such as sliding nozzles and submerged nozzles.


4. In order to ensure the surface quality of the continuous casting billet, select the appropriate maintenance slag; during the continuous casting process, the vibration marks formed on the surface of the continuous casting billet due to the vibration of the mold should be controlled; the continuous casting of ferritic stainless steel pipe fittings must be used. Electromagnetic stirring.


5. After fine-tuning the temperature of molten steel at the argon blowing station, it is lifted to the ladle turntable for continuous casting.


6. After the molten steel is cast, the stainless steel pipe fittings generally use the same vertical, vertical bending or arc continuous casting machines as carbon steel. The refined molten steel is poured into the ladle, and the ladle to be poured is transferred to the top of the tundish injection port through the turntable, 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 form and condense and move down continuously.


The billet solidified on the surface layer continues to be rapidly cooled in the second cooling section until the billet core becomes solid, and then the fixed-length flame cutting is performed, and the whole process of continuous casting of stainless steel pipe fittings is completed.


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