Square tubes are formed from coils and then ran through a series of
dies. They are are welded from the inside to form their shape.
Square tubes are generally used for maintenance and structural
purposes. Some examples of applications would be building
construction, railings, and sign posts. They are measured by their
outside dimensions and their wall thickness.
Manufacturing steps of stainless steel seamless pipe
1. The de-fire operation is followed by a multi-pass cold drawing
(cold rolling) process. The cold rolling of seamless pipes is
carried out on a multi-roll mill. The stainless steel seamless 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 a large yield coefficient, no expansion, bending, and so on. In
order to meet the health grade standard of stainless steel seamless
pipe, the cold-rolled pipe should be subjected to bright defire,
demagnetization, pickling, straightening, and other steps.
3. Pickling stainless steel pipe, when the pipe is removed from the
oil, rust, spot welding, an oxide layer, free iron, and other dirt,
the surface becomes silver treated, and then the surface is
uniformly pickled and passivated to prevent it from passing through
Corrosion and hydrogen embrittlement of metals inhibit the
production of acid mist.
4. After the above process, the next step is the polishing process
of the stainless steel tube. The inner and outer walls of the
pipeline are polished to a standard of 400 mesh, and the inner and
outer surfaces of the pipeline are polished to a mirror surface
standard (ie, hygienic standard).
5. The polished stainless steel seamless pipe should undergo
internal flaw detection and strict manual selection by the steel
pipe quality inspector through a metal flaw detector (or
hydrostatic test), and qualified products should be packaged and
delivered.
Production process: 1. Steel making → 2. Rolling round bar (peeling) → 3. Piercing
(retarding) → 4. Cold drawing → 5. Cold rolling (retarding,
demagnetization, pickling, cleaning) → 6. Inner wall polishing (400
mesh)→7.Exterior wall polishing (400 mesh)→8.Air pressure
test→9.Surface test→10.Attach trademark and certificate of
conformity×11. Packaging → 12. Delivery.Square Tube is commonly available in Aluminum, Stainless Steel, Hot
Rolled Steel and Cold Rolled Steel.
Images of Square Stainless Steel Seamless Pipe
Factory Details
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