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API 5L X70M High Frequency Welded Pipe For Gas Transmission High frequency welding (HFW) steel pipe is that ERW pipe produced with a welding current frequency equal to or greater than 70 kHZ. Through high-frequency current welding resistance, the heat generated in the contact objects, so the objected surface are heated to the plastic state, then with or without forging to achieve a combination Analysis of Corrosion-induced Invalidation of L320 . Third, the natural gas, water and soil in the steel pipe line contain corrosive gases, bacteria and other internal corrosion. According to the above reasons, the failure analysis of a long-distance natural gas pipeline with leakage occurred. The length of the long-distance natural gas pipeline in the failed section is about 212.6 km.
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