The process of making stainless steel seamless pipe: 1, steelmaking → 2, rolling round steel → 3, perforation (annealing) → 4, cold drawn → 5, cold rolling (annealing, demagnetization, pickling, cleaning) → 6, wall polishing  → 7, outer wall polishing  → 8, air pressure detection → 9, surface detection → 10, posted trademarks and certificates → 11, packaging → 12, factory

Stainless steel seamless pipe production steps:

1, The selection of quality standards of 304,316 L stainless steel raw material tube by the air, head, annealing and other operations.

2, After the completion of the above operation is followed by multi-pass cold drawn (cold rolling) process, the cold-rolled pipe in the multi-roll mill on the stainless steel pipe in the variable section of the circular hole and the non-moving cone-shaped head Ring-type rolling.

3, After cold-rolled stainless steel pipe will appear strong yield coefficient, not flaring, bending and other phenomena, in order to achieve stainless steel pipe sanitary standards, cold-rolled pipe after the need for bright annealing, demagnetization, pickling, correction Wait straight step.

4, Stainless steel tube pickling process, the pipe in the pickling passivation at the same time to remove the surface of the workpiece oil, rust, welding spot, oxide, free iron and other dirt, the surface after treatment into a uniform silver white, while preventing metal Over corrosion and hydrogen embrittlement phenomenon, inhibit the generation of acid mist.

5, Stainless steel tube after the above process, the next is the polishing process, the inner wall of the pipe, the outer wall polishing the standard number of 400 mesh, polished finish inside and outside the tube surface finish up to the mirror standard (that is, health standards).

6, After polishing the stainless steel pipe through the metal testing machine (or water pressure test) for internal testing and steel pipe inspectors strict manual selection, qualified products to packaging factory.

Note: stainless steel seamless pipe with sub-cold-rolled tube and hot-rolled tube, for the size requirements and high quality requirements of stainless steel sanitary seamless pipe, must be cold-rolled, cold drawn or the combination of the two production process.