Difference between ERW straight seam electric resistance welded steel pipe and LSAW (UOE) steel pipe:
First, the difference between raw materials and production capacity
ERW steel pipe material is hot-rolled steel coils, raw material UOE steel pipe is hot rolled steel sheet. Therefore, ERW steel pipe can achieve a continuous pipeline operations, high production efficiency, low production costs; and UOE steel pipe with a steel plate processing, can not achieve continuous pipeline operations, production efficiency is low, high production costs.
Restricted ERW steel pipe coil thickness, the maximum thickness is producible 25mm, to produce a maximum diameter of 660mm; UOE steel pipe produce the maximum thickness of 40mm, the steel sheet to produce the maximum diameter is limited only by the width of the currently available produce the maximum diameter of 1422mm.
Second, the difference between welding
ERW pipe welding without adding wire; UOE need to add steel wire.
Third, the appearance difference
ERW steel inside and outside welds required to be removed, so the corrosion favorable; UOE Pipe Wall Weld stay more than a high anti-corrosion disadvantage.
Fourth, the difference between the purchase cost and the difficulty of
ERW steel pipe low purchase cost, UOE steel pipe cost is very high, generally spread is 15% -25%. Domestic UOE steel manufacturers less, purchasing high degree of difficulty. When the diameter <Φ406mm, the greater the difference between the purchase cost.
ERW steel pipe manufacturers are more difficult to purchase low, when the diameter of <when Φ406mm, will mate was reduced procurement costs.
Five, Application difference
ERW steel pipes are mainly used in natural gas, refined oil, crude oil, pulp and other terrestrial long-distance pipelines.
UOE steel pipes are mainly used in high-voltage submarine long-distance pipelines, cold areas, land two, three, four types of regions.
