formula

Seamless tube process flow

Health grade mirror tube process flow:

Tube billet - Test - peeling - Test - heating - perforation - acid washing - grinding - lubrication air drying - welding head - cold drawing - solid solution treatment - acid washing - acid washing passivation - Inspection - cold rolling - deoiling - dry - internal polishing - External polishing - Inspection marking - - finished packaging

Industrial pipe process flow

Tube billet - Inspection - peeling - Test - heating - perforation - acid washing - repairing mushrooms - lubrication air drying - welding head - cold drawing - solid solution treatment - acid washing and passivation

Seamless steel pipe size and allowable deviation

Deviation grade standardized external diameter allowable deviation

D1 + 1.5%, smaller than 0.75 mm

D2 + 1%. Less than 0.50 mm

D3 + 0.75%. is smaller than 0.30 mm

D4 + 0.50%. Less than 0.10 mm

Weight formula for seamless steel pipe

[outer diameter wall thickness * wall thickness]*0.02466=kg/ m (weight per meter)