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ERW Pipe is short for electric resistance welded pipe.
HFW Pipe is short for high frequency welded pipe.
According to API 5L Spec, the definition of HFW pipe is ERW pipe produced with a welding current frequency equal to or greater than 70 kHz.
So, HFW pipe is a kind of ERW pipe based on the welding current frequency. In general, when a customer require ERW pipe, he probably means HFW. That’s why steel pipe people usually regard them the same.
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