Stainless steel seamless pipe production process ？

Stainless steel seamless pipes are manufactured using several steps, including:

1. Melting: The first step is to melt the stainless steel in an electric arc furnace, which is then refined and treated with various alloys to achieve the desired properties.
2. Continuous Casting: The molten steel is then poured into a continuous casting machine, which produces a solidified “billet” or “bloom” that has the required shape and size.
3. Heating: The solidified billet is then heated in a furnace to a temperature between 1100-1250°C to make it malleable and ready for further processing.
4. Piercing: The heated billet is then pierced with a pointed mandrel to create a hollow tube. This process is called “piercing.”
5. Rolling: The hollow tube is then rolled on a mandrel mill to reduce its diameter and wall thickness to the required size.
6. Heat Treatment: The seamless pipe is then heat treated to improve its strength and toughness. This involves heating the pipe to a temperature between 950-1050°C, followed by rapid cooling in water or air.
7. Finishing: After heat treatment, the seamless pipe is straightened, cut to length, and finished by polishing or pickling to remove any surface impurities and improve its appearance.
8. Testing: The final step is to test the pipe for various properties, such as hardness, tensile strength, and dimensional accuracy, to ensure it meets the required standards.

Once the pipe has passed all the required tests, it is ready to be shipped to customers. The entire process is carefully monitored and controlled to ensure the seamless pipe meets the necessary quality standards.