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Common sense of stainless steel pipe fittings
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Release Date:2021-11-15

The best way to improve the quality of stainless steel pipe fittings is to change the process from ingot to billet. Because of the improvement of quality control means of continuous casting process, this method has become a necessary means to improve product quality.

Casting billet product quality advantages embodied in stainless steel pipe fittings in addition to the first paragraph billet outer surface not grinding rate has reached more than 70%, the overall appearance grinding yield reached 99.15% in order to achieve this goal must to refining of molten steel, low oxygen and sulfur content, do well the bag and tundish metallurgy, accurately control the temperature of molten steel, oxidation pouring is realized. Further reduce inclusion content.

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

1. According to different types of steel, the mold vibration process is matched with the protection slag, which can improve the yield of 10%, energy saving and shorten the production cycle, thus improving the recovery rate of molten steel.

2. Stainless steel pipe fittings to use continuous casting, so as to improve the comprehensive yield, and with the furnace refining, significantly improve the production efficiency, but also omit the blank process, saving a lot of energy consumption.

3. Continuous casting of stainless steel pipe fittings is generally matched with the refining furnace, and has strict requirements on the chemical composition and temperature of molten steel; In order to prevent the secondary oxidation of molten steel, no oxidation protection casting is required during continuous casting. Strict requirements for refractory materials such as ladle, tundish, sliding nozzle and immersed nozzle.

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

5. After fine-tuning the temperature of molten steel by argon blowing station, it is hoisted to the ladle rotary table for continuous casting.

6. After molten steel is cast, stainless steel pipe fittings generally use the same vertical, vertical bending or arc continuous casting machine as carbon steel. The refined molten steel is poured into the ladle, and the ladle to be poured is transferred to the tundish above the 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 an immersion nozzle to form and condense and move down continuously.

The surface solidified billet is rapidly cooled through the secondary cooling section until the billet core becomes solid and then flame cutting is carried out, and the whole continuous casting process of stainless steel pipe fittings is completed.