Seamless pipe specifications

Seamless pipe according to GB/T8162-87
4.1. Specification: Hot rolled pipe with an outer diameter of 32-630mm. The wall thickness is 2.5-75mm. Cold rolled (cold drawn) pipe with an outer diameter of 5-20mm. The wall thickness is 2.5-12mm.
4.2 Appearance quality: The inner and outer surfaces of the steel pipe shall not have cracks, folds, folds, delamination, hairlines, or scabs. These defects should be completely removed, and after removal, the wall thickness and outer diameter should not exceed the negative deviation.
4.3. Both ends of the steel pipe should be cut at right angles and burrs should be removed. Gas cutting and hot saw cutting are allowed for steel pipes with a wall thickness greater than 20mm. After the agreement between the supply and demand parties, the head may not be cut.
4.4. The surface quality of precision seamless steel pipes for cold drawing or cold rolling shall refer to GB3639-83.