Difference between ERW, HFW, SAW and EFW pipe – www ...
2021-9-27u2002·u2002Advantage of HFW pipe In the welding process, HFW steel pipes do not need to add filling meta. So it has fast welding speed and high efficiency in production. HFW pipe is widely used in the fields of oil and gas transportation, oil well pipeline, building structure, and various kinds of mechanical pipe.
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