Carbon steel EFW pipe

Carbon steel EFW pipe, also known as carbon steel Electric Fusion Welding pipe, refers to the carbon steel pipe products manufactured by electric fusion welding (EFW) process.

Electric fusion welding refers to a kind of electron beam welding, which uses the directional impact kinetic energy of the high-speed electron beam to convert into heating of the workpiece, so that the workpiece leaves the melt and forms a weld. It is mainly used for welding dissimilar steel plates or metal weldments with high power density, which can be rapidly heated to high temperature and can melt any refractory metal and alloy. Deep penetration welding speed is fast, the heat affected zone is very small, so it has little influence on the performance of the joint, and the joint is almost not deformed. However, due to the use of X-rays for welding, special welding chambers are required.

Carbon steel EFW pipe guide

Material composition: Carbon steel EFW pipe is mainly composed of carbon and iron, and contains trace amounts of other elements. The carbon content is usually between 0.05% and 2.0%, depending on the grade and specification of the pipeline.

Manufacturing process: These pipes are produced using the electric fusion welding method, which involves fusing two pipe sections by applying electrothermal without the need for filling materials. This process ensures strong and consistent welding.

Sizes and specifications: Carbon steel EFW pipes are available in a variety of sizes and specifications to meet a wide range of applications from small diameter pipes to large diameter pipes. Common specifications are ASTM A671 / ASTM A672 / ASME SA671 / ASME SA672
Outer diameter Size: 16" NB To 100" NB (Nominal Bore Size)
Wall Thickness: Schedule 20 To Schedule XXS (Heavier On Request) Up to 250 mm Thickness.

Carbon steel EFW Pipe grade: ASME SA671 / ASTM A671 rating CA55, CB60, CB65, VB70, VV60, VV65, VV70, CD70, CD80, CE55, CE60, CF65, CF70, CF66, CF71, CG100, CH100, CJ101, CJ102, CJ103, CJ104, CJ105, CJ1 06, CJ107, CJ108, CJ109, CJ110, CJ111, CJ112, CJ113, CK75, CP65, CP75 ASME SA672 / ASTM A672 grades A45, A50, A55, B55, B60, B65, B70, C55, C60, C65, C70, D70, D80, E55, E60, H75, H80, J80, J90, J100, K75, K85, L65, L70, L75, N75.

Packing method: bulk, binding, wooden pallet, wooden box, plastic sheet packaging, plastic end cover, Angle protector.

Performance characteristics

High welding quality
The EFW process can achieve perfect fusion between the weld and the substrate, and the weld metallography is consistent with the performance of the base material, ensuring the long-term safe use of the entire pipeline under high pressure and high temperature operating environment.

High dimensional accuracy
Automatic production and strict control of process parameters make the outer diameter, inner diameter and wall thickness of the pipe uniform and stable, in line with the design tolerance requirements, to ensure the precision assembly and interchangeability of the system.

Excellent mechanical properties
After heat treatment, the pipe not only has high tensile and yield strength, but also has good ductility and toughness, which is suitable for bearing high pressure and complex loads.

High production efficiency
The high degree of automation of the EFW process significantly increases production speed and efficiency, while reducing labor costs and welding defects.

cost-effectiveness
Although the initial investment is slightly higher than that of the traditional manual welding process, its high production efficiency, stable product quality and low rework rate make the overall cost effectively controlled.

Application field

Oil and gas pipeline
Because pipelines need to operate for a long time in high-pressure, high-temperature and corrosive environments, carbon steel EFW pipes are widely used in oil and gas delivery systems due to their high quality welds and excellent mechanical properties.

Chemical pipeline system
In chemical plants, these pipes are used to transport a variety of chemical media, ensuring safe, continuous and efficient fluid transport.

Industrial equipment and structural piping
It is used to manufacture boilers, heat exchangers and other industrial transmission systems to meet the application requirements in a variety of medium to low pressure to high pressure environments.

Conclusion

Carbon steel EFW pipe adopts advanced electric fusion welding technology to produce pipe products with high welding quality, precise size and excellent mechanical properties. Through strict control of raw materials, process parameters and heat treatment processes, coupled with comprehensive quality testing, these pipes demonstrate high reliability and durability in oil and gas, chemical and industrial transportation systems.