ASTM A500 covers carbon steel, cold formed welded and seamless structural tube in both round and shaped forms.

Carbon Steel Seamless Pipes

ASTM A53 / A53M Standard covers seamless and welded black and hot-dipped galvanized steel pipe.

API 5L welded line pipe

API SPEC 5L is specifies requirements for the manufacture of two product specification levels.


ASTM A178/A 178M Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tubes


Tubing produced to the A513 specification also provide improved ductility with its closely controlled carbon steel grades.

ERW steel pipe in API 5L PSL2
ERW steel pipe in API 5L PSL2

API American Petroleum Institute standard --API (American Petroleum Institute) abbreviation.

EFW pipe vs ERW pipe

Electric Fusion Welded Pipes
+ EFW pipe

Electric Fusion Welding (EFW steel pipe) refers to an electron beam welding, the use of high-speed movement of the electron beam directed impact kinetic energy is converted to heat the workpiece so that the workpiece leaving the melt, the formation of the weld.

It is mainly used for welding dissimilar steel welding sheet or which high power density, metal weldment can rapidly heated to high temperatures, which can melt any refractory metals and alloys. Deep penetration welding fast, heat-affected zone is extremely small, so small performance impact on the joints, the joint almost no distortion. But it has a requirement on a special welding room because welding using X-rays.

Electric Resistance Welded Pipe
+ ERW pipes means Electric Resistance Welded Pipes.

Electric Resistance Welding (ERW steel pipe): welding member combination is applying pressure through the electrodes, the use of current through the joint area of ​​the contact surface and the adjacent heat generating resistance welding process method, Also known as contact welding. It has excellent toughness and dynamic load strength, welding deformation.

Commonly used spot welding, seam welding and butt three.

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