The Manufacturing Process of Seamless Tubes

By adminDec 7,2018

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The people who have been in the business of manufacturing seamless tubes will be well aware of the primitive technology of rolling mill, used widely in the nineteenth century. This technique was used to produce seamless pipes and tubes to be used in industries. The whole procedure is long and included the following steps:

  • With the use of funnel rolls, rolled sheets are converted into a cross-sectional circle
  • Through the welding process, the lap welding was carried out on these cross-sectional circle

This all seems to have changed now, thankfully because of the advent of new technological advancements and developments. Due to this, many new processes have surfaced that makes the whole manufacturing process of seamless tubes, easy and cost-effective. But the most popular process that has caught on with many manufacturers in the process of continuous tube mill. No forge welding or filler metal is used in this new technique.

Seamless Tube Manufacturing Process


1. Preparing the stainless steel sheets

The stainless steel sheets undergo several checks before getting picked to roll. While preparing them, the first step is to trim them around the edges.

2. Rolling through rollers

The sheets are then passed through many rollers to match the required size. In this step, you can see the sheets progressing into tubular shapes.

3. Rollers Through the fitted welding machine

In this step, the tubular shape has to go through a fitted welding machine. The inside of these tubular shapes, i.e., the weld beads and scraps are removed, thus giving you perfectly rolled tubes.

4. Cleaning and heating of rolled seamless tubes

After the stainless sheets have a basic rolled structure, it goes through the process of cleaning and heating. This depends upon the clients’ requirements. The stainless steel tubes are cleaned thoroughly to remove dirt before the heating process begins. Heating is used to remove the possible stress on the seamless tubes and let it have a seamless shape. The tubular shape is rolled in a hot furnace that has temperature controllers and recorders. The heating process helps the tubes to be straightened and open to pickling and removing the scales from its surface.

5. The cold-drawing process

Many clients have a peculiar tube requirement that will not match the seamless tubes rolled out directly from the mills. For this reason, another process of cold-drawing is to be performed to achieve the desired size.

To manufacture cold-drawn seamless tubes, the manufacturer first coats the tube with soap and oxalic solution. The solution helps to reduce the friction caused due to this process, by acting as a lubricant. Later, the seamless tubes are benched with the help of Die plugs.

6. Final touches

The final touches include ink jet marking on the seamless tubes, that educates the exporters about the tube’s grade, material, heat number, size, and a third party inspection stamp. Followed right after this are several stringent quality checks and appropriate packaging, making these seamless tubes ready for dispatch.

There are several industries that need seamless tubes in different alloys to have varied tensile strength. Thus many manufacturers produce the alloy steel Seamless tube. The most popular among these alloy steel seamless tubes are a carbon steel seamless tube.

If you are confused as to which one will suit your business, then don’t be. Just call Anand Seamless Tubes and let us help you to have custom seamless tubes, ideal for your business. Call us at +91-9099996851 or drop us a mail on to know more about our seamless tubes. Get in touch now!


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