Specifications: the external diameter of hot-rolled pipe should be 32-630mm; the external diameter of cold-rolled pipe should be 5-200mm. The wall thickness should be 2.5-12mm.

Presentation quality: the inner and outer surface of the seamless steel pipe should not exist in the crack, pucker, seam and scab. These defects should be cleared, but the wall thickness and the external diameter must in the line with standard after clean those defects.

The two ends should be in straddle cut to a right angle, and the burr should be cleared. The seamless steel pipe with over 20mm wall thickness can be allowed to gas cutting and hot cutting.