The production process of thick-walled seamless steel pipes can be divided into four basic methods: cold drawing, cold rolling, hot rolling, and hot expansion.

 

Classification and application:

 

Hot-rolled thick-walled seamless steel pipes, cold-rolled thick-walled seamless steel pipes, cold-drawn thick-walled seamless steel pipes, extruded thick-walled seamless steel pipes, and stainless steel seamless steel pipes for pipe jacking structures (GB/T14975-2002) are used for Seamless steel pipes of general structure and mechanical structure are widely used in hot-rolled (extruded, expanded) and cold-rolled (extruded, expanded) and cold-rolled stainless steel of corrosion-resistant pipes and structural parts and parts in the chemical, petroleum, textile, medical, food, machinery and other industries. Drawing (rolling) seamless steel tubes.

 

Material classification:

 

Thick-walled seamless steel pipes are made of 10#, 20#, 35#, 45#, which are called ordinary steel pipes and alloy steel pipes.

 

Process flow of sanitary mirror tube:

 

Tube blank-inspection-peeling-inspection-heating-perforation-pickling-grinding-lubrication and air drying-welding head-cold drawing-solution treatment-pickling-pickling Passivation-inspection-cold rolling-degreasing-cutting-air drying-internal polishing-external polishing-inspection-marking-finished product packaging.

 

Process flow of thick-walled industrial pipe:

 

Tube blank-inspection-peeling-inspection-heating-perforation-pickling-mushroom repair-lubrication and air drying-welding head-cold drawing-solution treatment-pickling-pickling Passivation-inspection.