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Manufacturing steps of stainless steel seamless pipe


About the production steps of stainless steel seamless pipe

The uses of stainless steel seamless pipes are different, and the corresponding manufacturing processes are also different. For example: stainless steel seamless pipes are divided into cold rolled pipes and hot rolled pipes. For stainless steel sanitary seamless pipes with higher size and quality requirements, cold rolling, cold drawing or a combination of the two must be used.

Manufacturing steps of stainless steel seamless pipe:

The standard via 304, 316L high quality stainless steel material is empty, starting and annealing operations.

1. The cold rolling of steel pipes is carried out on a multi-roll mill. The stainless steel pipe is rolled with a circular pass composed of a variable-section circular groove and a fixed cone head.

2. The stainless steel tube after cold rolling has the advantages of large yield coefficient, no flaring, bending and so on. In order to meet the health level standard of stainless steel pipes, the cold-rolled pipes should undergo bright annealing, demagnetization, pickling, straightening and other steps.

3. Pickling stainless steel pipe, while the pipe is to remove oil, rust, spot welding, oxide layer, free iron and other dirt, the surface becomes silver treated and the surface is uniformly pickled and passivated to prevent corrosion through the metal and hydrogen embrittlement, inhibiting the production of acid mist.

4. After the above process, the next step is the polishing process of the stainless steel tube. The standard of polishing mesh on the inner and outer walls of the pipeline is 400 mesh, and the smoothness of the inner and outer surfaces of the pipeline polishing reaches the mirror surface standard (ie, the hygiene standard).

5. The polished stainless steel pipe should be inspected by the metal flaw detector (or hydraulic test) for internal flaw detection and strict manual selection by the steel pipe quality inspector, and the qualified products should be packaged and delivered.


Post time: Jun-28-2022