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 drawing (cold rolling) process, the cold-rolled pipe in the multi-roll mill on the stainless steel pipe in the variable-section round hole and the non-moving cone-shaped head Ring-shaped 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 Straight step.
5, 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.
6, 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 surface finish up to the mirror standard (that is, health standards).
7, after polishing the stainless steel pipe through the metal flaw detector (or water pressure test) for internal testing and steel pipe inspectors strict manual selection, qualified products to packaging factory.
Note: stainless steel seamless steel pipe with cold-rolled tube and hot-rolled tube, for the size requirements and high quality requirements of stainless steel sanitary seamless pipe, must use cold-rolled, cold drawn or the combination of the two production process.
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