When we purchase steel pipes, we often come into contact with two products, ERW steel pipes and seamless steel pipes, which are widely used in our lives. So, what's the difference between the two? How to choose?
There are differences between ERW steel pipes and seamless steel pipes in production processes, physical properties and application scenarios. Below we will introduce the differences between ERW steel pipes and seamless steel pipes from these three aspects.
1. Production process
The biggest difference between ERW steel pipes and seamless steel pipes is that ERW has a weld seam, which is also the key to the quality of ERW steel pipes. The production process of ERW steel pipes generally adopts the resistance welding process. ERW welded steel pipes are made by bending steel strips or steel plates into the required shape, and then going through processes such as welding, heat treatment and mechanical processing.
ERW stands for resistance welding. Resistance welding has the characteristics of high production efficiency, low cost, material saving, and easy automation. Therefore, it is widely used in various industrial sectors such as aviation, aerospace, energy, electronics, automobiles, and light industry. It is one of the important welding processes. one.
Seamless steel pipes generally use perforation and rolling processes. Seamless steel pipes are characterized by no welds in the pipe and have high strength, toughness and corrosion resistance.
2. Physical properties
There are also differences in the physical properties of ERW steel pipes and seamless steel pipes. The strength, toughness, corrosion resistance and high pressure resistance of seamless steel pipes are better than those of welded steel pipes (ERW steel pipes). Therefore, seamless steel pipes are widely used in pipelines and equipment under high pressure, high temperature and special environments.
ERW steel pipes have good toughness and reliability and are suitable for transporting low-pressure liquids and gases such as oil and natural gas. ERW steel pipes are also widely used in manufacturing machines, constructing buildings, etc.
ERW steel pipe VS Seamless steel pipe: Different application scenarios.
There are also differences in the application scenarios of ERW steel pipes and seamless steel pipes.
1. Application scenarios of ERW steel pipes
ERW steel pipes are mainly used to transport low-pressure liquids and gases, such as tap water, gas, air conditioning water pipes, etc. ERW steel pipes are also widely used in construction materials, machinery manufacturing, power chemical industry and other fields. Compared with seamless steel pipes, ERW steel pipes are more affordable and suitable for some economically limited occasions.
2. Application scenarios of seamless steel pipes
Seamless steel pipes are mainly used in transportation pipelines and equipment under high pressure, high temperature and special environments. Specifically, seamless steel pipes are widely used in petroleum, natural gas, chemical industry, electric power, aerospace, pharmaceutical and other fields. In some special industries, such as the nuclear energy industry, seamless steel pipes are an indispensable material.
Tips: ERW welded pipe is formed by rolling strip and welding the seam, with tighter dimensional tolerances and less weight. The weld seam is heat treated after welding that no untempered martensite remains, and the weld flash can be removed from both inner and outer surfaces. ASTM A53 ERW steel pipe is a typical carbon steel pipe. It is largely used to convey fluids at low / medium pressures such as oil, gas, steam, water, air and also for mechanical applications.