LSAW steel pipe VS straight seam ERW steel pipe

　　Straight seam ERW steel pipe is made with hot-rolled coil, straight seam welded steel pipe can be divided into high-frequency electrical resistance welding and submerged arc welding by different welding type. Compared the welding process of submerged arc welding steel pipe, high-frequency ERW steel pipe does not add any welding materials in welding process, weld forming has not through hot-melting state, only the weld metal goes through the re-crystallization process, so the formed welding is completely the same chemistry as the base metal. Welded steel after annealing treatment, the cold working internal stress and welding internal stress are improved, so that the straight seam ERW steel pipe with good comprehensive mechanical properties.

　　LSAW steel pipe is made by hot-rolled steel plate as raw materials and doing longitudinal welded in the high-frequency welding equipment. In the welding process it will add some filler and particle protection flux to doing submerged arc welding. Small diameter LSAW steel pipe usually has only one weld seam, but the large diameter LSAW steel pipe is always welded with two pieces large diameter steel plate, so there are two weld seam. The LSAW steel pipe with fully automated, high level quality welding out advantages, and the heat exchange and protection of itself relatively high performance, so LASW welded steel pipe can be used for high current, high welding efficiency come out. Can execute GB / T3091-2008 low pressure fluid steel pipe production standards, GB / T9711.1-2 -1997 petroleum and natural gas steel pipe production and use standard, it also can execute US API 5L pipeline steel pipe implementation standards.

　　ERW steel pipe and LSAW steel pipe are popular used in daily production, transportation and so on, the technique of ERW & LSAW is important in steel industry. The black steel pipe and API steel pipe are also available.

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