A Walkthrough On How Seamless Steel Pipes Are Manufactured

It’s not stainless steel pipes, but seamless steel pipes. A seamless pipe can either be made of carbon, metal, or stainless steel. Focusing on the stainless steel type, they offer advantages, such as increased strength, reliability, and resistance to rusting, making them incredibly ideal for industries, such as oil and gas, chemicals, and power generation, among others.

However, you might ask how seamless steel pipes are manufactured before you make your purchase. This guide will walk you through the seamless pipe production and manufacture processes, covering the following:

– The seamless pipe production method

– How is a seamless pipe made

The Seamless Pipe Production Process

The process is divided into five crucial methods. Each approach below will be discussed according to their sub-processes:

1. Hot Rolling

In the hot rolling process, there’s heating, or when the billet gets pre-heated through the heating furnace. This is followed by perforation wherein the heated steel billet is perforated using a perforation machine. Lastly, there’s rolling, where the perforated tube blank is rolled several times to adjust its diameter and the thickness of its walls.

2. Cold Drawing

After the hot rolling comes cold drawing wherein the steel billet forms an initial tubular layout. But this is still part of the hot rolling procedure. The cold drawing begins when the hot-rolled tube blank is stretched mechanically. 

3. Extrusion

Before the actual extrusion process, the billet is first raised to extrusion temperature via a heating furnace. In the process of extrusion, the heated billet is extruded via an extruder to form a tubular structure. 

4. Rotary Piercing

Fourth is rotary piercing. It also starts with heating, wherein the steel billet is raised to the rotary extrusion temperature. The actual process is when the heated steel billet is rotary extruded to form a tubular structure. As you can see it is almost similar to the extrusion process.

5. Hollow Tube Piercing

Everything in the seamless steel pipe production process ends with hollow tube piercing or when the steel billet is perforated via a perforation machine after getting heated to the piercing temperature. Its heating process sets this method apart. 

Not every process above applies to all. There is a particular method that works best for your industry’s intended application. 

How Is a Seamless Pipe Made

The manufacturing process for seamless steel pipes is divided into 10 key stages:

1. Choosing High-Quality Steel Billets

The first stage is ensuring the steel billets you choose are high-quality. Thus, billets must be examined for flaws, ensuring they meet the highest industry standards. They then go through pre-treatment to clean and remove surface impurities.

2. Heating and Piercing

You will see the processes discussed above come to life here. To prepare the raw materials, the cold heating process ensues. A rotary pierce mill is then used to create a hole in the billet.

3. Rotary Piercing or Extrusion

This phase begins by using a rotating cutting approach to attain the ideal size and quality. Gradually, you’ll be able to reach the required diameter and wall thickness. 

4. Stretch Reduction

In here, the rough top shell is made longer and thinner. Rollers and tension control are implemented to narrow the outside width and enhance the surface. 

5. Sizing and Cooling

In this step, the pipe is shaped to achieve size consistency. Water or air cools the pipe to maintain structural and tensile qualities.

6. Straightening and Cutting

First, line up the pipe to remove all instances of twisting or warping. Afterward, use a straightening machine to carry out the most precise adjustments. The step ends with the cutting of the seamless pipe to the desired lengths with saws.

7. Inspection and Testing

This stage involves visual inspection, chemical composition analysis, mechanical property testing, and ultrasonic testing. It also involves hydrostatic tests, packaging, labeling, reports, and records. Basically thorough inspection and testing to prepare the pipe for the next stage.

8. Heat Treatment

These treatments can either be cooling, annealing, or tempering with the goal of enhancing mechanical features.

9. Surface Finishing

The process is almost done since your pipes here will undergo cleaning, passivation, and finishing to achieve the desired finish.

10. Packaging

After the final compliance check and inspection, pipes will be packed carefully for safe transportation as orders for their clientele.

Strength for Your Industries With YOUFUMI

Speaking of seamless pipes, there’s a brand in today’s industry that produces the best lined pipe fittings, and that’s YOUFUMI. Our team is known to carry out large-scale and mass production of not just pipe fittings, but all of the products in our catalog have gone through standardization, universalization, and serialization principles, together with the processes from advanced automated equipment. 

All these ensure processes are precise, products are of the highest quality, efficiency is throughout, and costs are reduced. See what’s best for your company by speaking with our representatives today. 

Reference

Seamless Pipe Manufacturing Process (1)

What Are Seamless Steel Pipes (2)