Understanding of thick-walled steel pipes: Thick-walled steel pipes refer to steel pipes with a ratio of outer diameter to wall thickness less than 20. They are mainly used as petroleum geological drilling pipes, cracking pipes for petrochemicals, boiler pipes, bearing pipes, and high-precision structural pipes for automobiles, tractors, and aviation. First of all, the biggest difference between thick-walled steel pipes and thin-walled steel pipes is the thickness of the pipe wall. Steel pipes with a wall diameter greater than 0.02 are generally called thick-walled steel pipes. You may like the precautions for using thick-walled steel pipes. Thick-walled steel pipes have a very wide range of uses. Because of their thicker walls, they can withstand greater pressure. Generally, they can be used as materials for hollow parts to withstand pressure and important pipelines. Specifically, they can be used as structural pipes for aviation, petroleum geological drilling pipes, pipes for petrochemicals, and so on. When thick-walled steel pipes are used, relevant regulations must be followed. Therefore, different uses require the use of corresponding pipes of different specifications. This also provides an important premise for the use of thick-walled steel pipes, especially when transporting more dangerous and flammable media. It is necessary to find steel pipes of suitable specifications to effectively prevent accidents. Thick-walled steel pipes have a very large range of uses. According to their different models and specifications, they can be widely used in various heavy industries. Therefore, the development of thick-walled steel pipes is also worth looking forward to. Thick-walled steel pipes are mainly used in tap water projects, the petrochemical industry, the chemical industry, the power industry, agricultural irrigation, and urban construction. For liquid transportation: water supply and drainage. For gas transportation: coal gas, steam, liquefied petroleum gas. For structural use: as piling pipes, bridges; docks, roads, building structure pipes, etc.

The general wall thickness of thick-walled steel pipes is more than 20 mm, and there are no special requirements. The following is the manufacturing process of steel pipes.

The raw material of thick-walled steel pipe is steel pipe billet. The billet is cut by a cutting machine into a billet of about 1 meter in length and sent to the furnace for heating through a conveyor belt. The billet is sent into the furnace for heating at a temperature of about 1200 degrees Celsius. The fuel is hydrogen or acetylene. The temperature control in the furnace is the key issue.

After the round billet is taken out of the furnace, it must be perforated by a pressure-piercing machine. Generally, the more common piercing machine is a conical roller piercing machine. This piercing machine has high production efficiency, good products, large perforation, and expansion, and can pierce a variety of steel types. After perforation, the round billet is successively rolled by three rollers, rolled continuously or extruded. After extrusion, it needs to be removed from the tube and sized. The sizing machine rotates into the billet at high speed through a conical drill bit to punch holes. A steel pipe is formed. Thick-walled steel pipes are divided into two types, one is a hot-rolled steel pipe and the other is a hot-expanded steel pipe.

Precautions for thick-walled steel pipes in use:
How thick the wall is to be called a thick-walled steel pipe? This is a little doubtful. This depends on the ratio of the outer diameter of the steel pipe to the wall thickness of the steel pipe. For example, a steel pipe with a diameter of 50 mm, 10 mm can be considered a thick-walled steel pipe, but for a steel pipe with a diameter of 219 mm, 10 mm is only a thin-walled steel pipe. The basic definition of thick-walled steel pipe is a name given to it by customers. Precautions refer to when purchasing thick-walled steel pipes, customers must clarify the material of their steel pipes and the length of a single steel pipe because this involves the number of mechanically processed parts and some unnecessary waste.

Then there are the detailed dimensions of the inner and outer diameters of the steel pipe, which should be included because some parts processing volume should be reserved. As a kind of mechanically processed steel pipe, thick-walled steel pipes are also classified in many ways. Customers should clarify whether they need hot-rolled seamless steel pipes, seamed thick-walled steel pipes, and some cast steel thick-walled steel pipes and hot-forged thick steel pipes. The alternatives can be explained, and the non-alternatives can be directly emphasized.

How to determine the key points of thick-walled steel pipe:
1. Pay attention to its thickness. The pipe diameter should be greater than 0.02, because only in this way can it withstand great pressure, and even if it is pulled hard, it will not break. Secondly, see whether its surface is smooth. The surface of inferior thick-walled steel pipes often has scars, and some have small cracks. Its surface lacks luster. Once you see such a steel pipe, you will know that it is not a high-quality steel pipe.
2. You also need to measure the pipe diameter from different places. See if the different places are the same. The steel pipe should be approximately the same in all places, otherwise it is inferior. When choosing, you should choose large manufacturers, which generally have strict packaging. The packaging is relatively loose and is often not standardized.