Characteristic
1. OD Tolerence: ≤OD 15mm with ±0.05mm,≥ 15mm with ≤0.1mm.
2.Smooth touching in the surface, without any ridges or unevenness.
3.. The weld seam should be uniform and neat, the inner protrusion height ≤ 0.06mm. For pipes with a diameter of 9.5mm and above, the inner surface must be flattened without any protrusions.