Thick-walled steel pipes, the steel pipe whose outer diameter to wall thickness ratio is less than 20 is called thick-walled steel pipe. Mainly used as petroleum geological drilling pipes, cracking pipes for the petrochemical industry, boiler pipes, bearing pipes, and high-precision structural pipes for automobiles, tractors, etc. First, there is a big difference between thick-walled steel pipe and thin-walled steel pipe in terms of the thickness of the pipe wall. If the diameter of the steel pipe wall is greater than 0.02, we generally call it thick-walled steel pipe. Maybe you will like the precautions for using thick-walled steel pipes. Thick-walled steel pipes have a very wide range of applications. Because of their thicker pipe walls, they can withstand greater pressure. Generally, it can be used as the material of hollow parts to withstand pressure and use on important pipelines. Specifically, it can be used as a structural pipe, petroleum geological drilling pipe, petrochemical pipe, and so on. When using thick-walled steel pipes, the relevant laws and regulations must be followed. Therefore, different specifications of pipes must be used for different purposes. This also provides an important prerequisite for the use of thick-walled steel pipes, especially when transportation is more dangerous. In the case of flammable media, it is necessary to find steel pipes of appropriate specifications to effectively prevent accidents. Thick-walled steel pipes have very large 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 water supply engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, and urban construction. Used for liquid transportation: water supply and drainage. Used for gas transportation: coal gas, steam, liquefied petroleum gas. For structural purposes: as piling pipes and bridges; pipes for docks, roads, and building structures.
The manufacturing process of steel pipes.
The raw material of thick-walled steel pipes is steel pipe blanks. The pipe blanks are cut by a cutting machine into a blank of about 1 meter in length and are sent to the furnace for heating via a conveyor belt. The steel billet is sent into the furnace for heating at a temperature of about 1200 degrees Celsius. The fuel is hydrogen or acetylene.
After the round tube billet is out of the furnace, it needs to be pierced by a pressure piercing machine. Generally, the piercing machine is a tapered roller piercing machine. This type of piercing machine has high production efficiency and good products. It has a large perforation diameter and can wear a variety of steels. After piercing, the round tube billet is cross-rolled, tandem rolled, or extruded by three rolls one after another. After the extrusion, the tube is stripped and sizing. The sizing machine rotates into the billet through a tapered drill at a high speed to perforate the billet. The steel pipe is formed. There are two types of thick-walled steel pipes, one is a hot-rolled steel pipe and the other is a hot-expanded steel pipe.
Matters needing attention in the use of thick-walled steel pipes:
Note that when purchasing thick-walled steel pipes, customers must clarify the material of their steel pipes and the length of each steel pipe, because this involves the number of machined parts and some waste.
The detailed dimensions of the inner and outer diameters of the steel pipe are required to reserve some parts for processing. Thick-walled steel pipes, as a kind of mechanically processed steel pipes, have many classifications. Customers must make clear whether they need hot-rolled seamless steel pipes, or seam thick-walled steel pipes, and the manufacture of some cast steel thick-walled steel pipes and hot-forged thick steel pipes. The form, the description that can be substituted, the direct emphasis that can not be substituted.
How to determine the important key of thick-walled steel pipe:
1. Pay attention to its thickness, the pipe diameter is greater than 0.02 because only this kind of pressure can withstand large, even if it is pulled with force, it will not break. Secondly, it depends on whether its surface is smooth. Inferior thick-walled steel pipes often have scars on the surface, and some have small cracks, and their surface lacks luster. When you see such steel pipes, you must know that it is not superior. Steel pipe.
2. It is also necessary to measure the pipe diameter from different places. See if different places are the same, the steel pipe should be approximately the same everywhere, otherwise, it is inferior. When you choose, you should choose large manufacturers, which generally have strict packaging, and the packaging is relatively loose and often not standardized.