Steps in producing seamless steel pipe

Producing seamless steel pipe requires careful attention to various steps to ensure high-quality output. Here are the key steps involved in the production process.

Blank Preparation

Storage: Proper storage of the steel tube blanks.

Cutting: Cutting off the tube blanks using shears or gas cutting.

Peeling and Grinding: Removing surface imperfections by peeling and grinding.

Testing and Inspection: Conducting thorough testing and inspection of the tube blanks.

Surface Treatment: Treating the surface of the seamless steel tubes (e.g., pickling) and performing cold centering.

Tube Heating

Furnace Heating: Heating the tube blanks in a ring furnace or inclined furnace slab furnace.

Pre-Perforation Baking: Baking the tube to the required temperature before sending it to the perforation step.

Perforation

Hollow Rolling: Using solid round steel to create a hollow rolling thick walnut.

Piercing Process: Typically using two or three-roll oblique piercing or continuous steel ingot billet punching. The piercing can be done in a hydraulic press or a two-roll (vertical rolling) pressure piercing mill (P.P.M. Mill).

Pipe Rolling

Wall Reduction: Reducing the wall thickness of the hollow hair pipe step by step.

Special Tube Processing: Processing the tube in a pipe mill to achieve the desired specifications.

Leveling: Using a whole machine for leveling after rolling the pipe in an automatic pipe rolling unit.

Reheat and Sizing Reduction

Reheating: Reheating the tube to the required temperature.

Sizing Machine: Processing the reheated tube on a sizing machine.

Reducer and Stretch Saver: Using a reducer, stretch saver, or widening machine to achieve the final dimensions of the finished steel tubes.

Rounding, Inspection, and Storage

Slight Rounding: Performing slight rounding of the tube as needed.

Inspection: Conducting final inspections to ensure quality.

Anti-Packaging: Applying anti-corrosion packaging as required.

Storage: Storing the finished seamless steel pipes properly.

By meticulously following these steps, manufacturers can produce high-quality seamless steel pipes that meet industry standards and customer expectations.