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How Is Seamless Pipe Made?

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Seamless pipe has the advantages of excellent mechanical properties and easy machine processing. Thus it has been reused in many industries. Wanzhi Steel produces seamless steel pipes in both cold-drawn and hot-rolled processes. In addition, we can provide exclusive solutions to our customers according to their different needs. Next, we will show you how seamless steel pipes are made.

Seamless Stee Pipe in China
Seamless Stee Pipe
Different Sizes of Seamless Tubes
Seamless Pipe Size
SS Steel Pipe for Sale
SS Steel Pipe

Hot Rolled Seamless Pipe Production Process

Round pipe billet → heating → perforation → three-roll slant rolling, continuous rolling or extrusion → deburring → sizing (or reducing) → cooling → billet → straightening → hydrostatic test (flaw detection) → marking → storage

1. First, the solid pipe billet is removed from the surface defects and cut to the required length. Then the billet is centered on the end face of the piercing end, sent to the heating furnace for heating, and pierced on the piercing machine.

2. In the perforation while constantly rotating and advancing. Under the action of rolls and top head, a cavity is gradually formed inside the pipe billet, which is called a burr pipe.

3. The burr pipe is sent to the automatic rolling mill to continue rolling. Finally, the wall thickness is equalized by the equalizing machine and then sized by the sizing machine to meet the specifications.

Hot Rolling Process of Seamless Steel Pipe
Hot Rolling Process
Seamless Steel Pipe Quality Inspection
Quality Inspection
Hot Rolled Seamless Pipe Manufacturer
Hot Rolled Seamless Pipe

Cold-drawn Seamless Pipe Production Process

Round pipe billet → heating → piercing → beating → annealing → pickling → oiling (copper plating) → multiple cold drawing (cold rolling) → billet → heat treatment → straightening → hydrostatic test (flaw detection) → marking → storage

The raw material of cold drawn seamless pipe is hot rolled steel coil. After pickling to remove the oxidation skin and then cold rolled several times. Therefore, its surface quality, appearance, and dimensional accuracy are higher than that of hot-rolled seamless steel pipe. But the quality of seamless steel pipe is good whether it is manufactured by cold-drawn or hot-rolled process. You can choose according to your needs.

Cold Drawn Seamless Pipe in Wanzhi Steel
Cold Drawn Seamless Pipe
Cold Drawn Seamless Tube
Cold Drawn Seamless Tube

Precautions for Selecting Seamless Tubes

1. Choose Environmentally Friendly Materials

When buying seamless steel pipes, try to choose some healthy and environmentally friendly materials. If you are going to buy seamless pipes for home plumbing use, it is recommended that you first use your nose to smell whether this water pipe has some odor or pungent smell. If there is an odor, do not choose, otherwise, long-term use will cause harm to the body.

2. Choose According to Appearance

When buying seamless steel pipe, you can observe its surface color. If the surface of seamless steel pipe is too rough and uneven in thickness, then this must be of inferior quality.

3. Check the Manufacturer’s Certificate

Legitimate manufacturers of seamless pipes can provide relevant certificates. If they can’t, then it means that there is a quality problem with the pipe. Be sure to keep your eyes peeled and choose a regular manufacturer.

Steel Pipes for Sale
Large Size Seamless Pipes
SS Tube for Sale
Seamless Steel Tube for Sale

Seamless Steel Pipe Packaging

According to GB2102-88, there are three kinds of packaging for seamless steel pipes: bundling, boxing, oiled bundling, or oiled boxing.

Wanzhi Steel can ship according to the packaging method specified by customers. If you have special requirements, please make sure to inform us in advance. In addition, we have our factory and seamless steel pipe production line, with the ability to accept large quantity orders. Finally, if you are looking for high quality seamless steel pipes, please feel free to contact us for more details.

Steel Tube Wanzhi Steel
Seamless Pipes in Wanzhi Steel
Seamless Steel Tubes in Stock
Seamless Steel Tubes in Stock


Wanzhi Steel produces seamless steel pipes in different materials, including galvanized seamless pipes and stainless steel seamless pipes. You can choose according to your actual needs. You can also browse our website to find other products suitable for your project. Also, if you have any questions, don’t hesitate to contact us now for more details. Wanzhi Steel is looking forward to cooperating with you.