(1) Lamination and Inclusion
When processing the pipe end, operators should carefully inspect the pipe end for lamination and inclusion. Steel pipes are not allowed to have lamination or inclusion that extends to the pipe end or bevel surface and has a lateral dimension exceeding 6.4mm. Pipe ends with lamination or inclusion exceeding 6.4mm can be re-cut until there is no lamination or inclusion exceeding 6.4mm.
(2) Hard Spot
Steel pipes must not have hard spots exceeding 50mm in any direction and with a hardness value higher than 35HRC (327HBW/345HV10). If any, they can be removed.
(3) Bevel and Root Face
Unless otherwise specified by the customer, steel pipes with a wall thickness greater than 3.2mm should have a bevel with an angle of 30° to 35°; the root face should be 1.6±0.8mm, and the bevel angle should be measured from the perpendicular to the axis of the steel pipe.
To remove internal burrs caused during pipe end processing, the internal chamfer of the pipe end should not exceed 7°, and its measurement should be based on the centerline of the steel pipe.
