The main difference between black steel pipe and ERW steel pipe lies in their manufacturing process and application range. Black steel pipe is produced by forging process, while ERW steel pipe is manufactured by resistance welding process. ERW steel pipe is made of very fine hard steel, while black pipe is usually made of forgeable steel. The application of black steel pipe is mainly concentrated in gas pipelines and hot water circulation systems in houses, while the use of ERW steel pipe is more extensive, covering oil and gas pipelines, structural engineering and industrial applications.
What is black steel pipe?
Black steel pipe is a steel pipe made of carbon steel, and the surface is not galvanized, so it has a black appearance. This kind of pipe is popular because of its simple manufacturing and low cost, and is often used in construction and industrial piping systems. Black steel pipes are often used in water supply pipelines, natural gas transmission, and oil refineries. In addition, they are also a common type of pipes in fire sprinkler systems.
Due to its untreated surface, black steel pipe has a certain ability to resist high temperature and high pressure, which makes it suitable for applications exposed to specific liquid and gas environments. However, black steel pipes are prone to rusting when exposed to moisture or corrosive environments for a long time, so they are not suitable for long-term applications exposed or underground.
What is ERW steel pipe?
ERW (electric resistance welded) steel pipe is a pipe made by rolling steel plates into a round shape and then using a resistance welding process. This welding process does not require the use of filler metal, but uses electric current to heat the edges of the steel so that it fuses under high pressure to form a strong weld. ERW steel pipes are usually used in projects that require strict tolerances and high quality requirements, and are suitable for occasions where high strength and corrosion resistance are required.
ERW steel pipes can be produced in a variety of sizes, wall thicknesses and lengths to meet the needs of different applications. Its production process strictly controls the accuracy and consistency of the steel pipe, so ERW steel pipes are very convenient during installation, which can ensure the tightness of the pipeline connection and reduce the risk of leakage.
The main difference between black steel pipe and ERW steel pipe
1. Manufacturing process
Black steel pipe is forged from carbon steel and has no surface
galvanizing treatment, so it looks black. ERW steel pipes are made by rolling steel plates into pipes through a resistance welding process. No filler metal is required during the welding process. Only the edge of the steel plate is heated and fused using electric current.
2. Materials and Structure
Black steel pipes are usually made of softer
carbon steel, which has certain toughness and high temperature resistance. ERW steel pipes are made of finely processed hard steel materials, which have higher corrosion resistance and strength and can withstand higher pressures and harsh working conditions.
3. Corrosion resistance
Because black steel pipes are not galvanized on the surface, they are prone to rust in humid or corrosive environments and are not suitable for applications exposed to air for a long time. ERW steel pipes are strictly controlled during the production process and have high corrosion resistance, which is suitable for applications that require durability and long-term use.
4. Application areas
Black steel pipes are usually used for low-pressure, short-term use applications, such as indoor natural gas transmission and hot water piping systems. Its main applications include water supply pipelines, natural gas pipelines, fire protection systems and other indoor piping systems. In contrast, ERW steel pipes are widely used in oil and gas extraction, structural engineering, water and gas pipelines and other occasions with high pressure and high strength requirements. Due to its high precision and durability, it is suitable for long-term use projects.
Conclusion
There are significant differences between black steel pipes and
ERW steel pipes in terms of manufacturing process, material properties and applicable fields. Black steel pipes are suitable for indoor low-pressure piping systems due to their low cost and easy processing. ERW steel pipes are widely used in high-demand industrial and construction projects due to their high strength, corrosion resistance and high precision. Which pipe to choose mainly depends on your project requirements. If the project has high requirements for corrosion resistance, strength and precision, ERW steel pipes are undoubtedly a better choice.
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