Patent Tube

Patent Pipe is a carbon steel pipe with longitudinal welding
and round section. It is produced from low-grade steel coils
carbon content SAE/ABNT 1008/1012.
Hot rolled, cold rolled or galvanized and welded by
ERW electrical resistance, its manufacturing tolerance is based
in national standards.
For diameter, the values in inches refer to the value
nominal (inside diameter) and the values in millimeters are
related to external measurement (outer diameter).