The manufacturing process and steps of stainless steel seamless pipe should be informed in advance that the manufacturing process of stainless steel seamless pipe is different, and the corresponding manufacturing process is also different. For example: Stainless steel seamless steel 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.
First, the manufacturing steps of stainless steel seamless pipe:
The standard of pipe via 304,316L high-quality stainless steel material is empty, and the annealing operation begins.
1. The above operation is followed by a multi-pass cold drawing (cold rolling) process. The cold rolling of steel pipes is carried out on the multi-roller . stainless steel pipe is rolled with a circular pass consisting of a variable cross-section circular groove and a fixed cone head.
2. Cold-rolled stainless steel pipes have the advantages of large yield coefficient, no flaring, and no bending. In order to meet the health grade standards of stainless steel pipes, the cold-rolled pipes should undergo bright annealing, demagnetization, pickling, straightening and other steps.
3, pickling stainless steel pipes, while the pipe is removing oil, rust, spot welding, oxide layer, free iron and other dirt, the surface becomes evenly pickled and passivated after silver treatment, thereby preventing the occurrence of metal corrosion and hydrogen embrittlement , and inhibiting the production of acid mist.
4. After the above process, the next step is the polishing process of the stainless steel pipe. The standard for polishing nets on the inner and outer walls of the pipeline is 400 mesh, and the finish of the polished inner and outer surfaces of the pipeline reaches mirror standards (that is, sanitary standards).
5. The polished stainless steel pipes should pass a metal flaw detector (or hydraulic test) to conduct internal flaw detection and strict manual selection by the steel pipe quality inspector, and qualified products will be packaged and delivered.
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2. Production process of stainless steel seamless steel pipe.
production process: 1. Steelmaking → 2. Rolling round steel (peeling) → 3. Perforation (annealing) → 4. Cold drawing → 5. Cold rolling (annealing, demagnetization, pickling, cleaning) → 6. Inner wall polishing (400 mesh) → 7. Exterior wall polishing (400 mesh) → 8. Air pressure test → 9. Surface test → 10. Attached trademark and certificate of conformity × 11. Packaging → 12. Delivery.
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