石油弹壳管

API Steel casing pipe Specification: Out Diameter: 4-1/2"- 10-3/4"(114.30mm-273.05mm) Wall thickness: 5.21mm-11.43mm Length: 6m, 9m, 12m, special length Steel Grade: H40, J55, K55 Standards:APIspec 5CT,other as consumer Certification: ISO9001-2000, API 5L, API 5CT ERW is short for Electric Resistance Weld, which isa method used to manufacture electric resistance weld pipe. Electric Resistance Welded (ERW) and High Frequency Induction (HFI) Welded Pipe. Originally this type of pipe, which contains a solid phase butt weld, was produced using resistance heating to make the longitudinal weld (ERW), but most pipe mills now use high frequency induction heating (HFI) for better control and consistency. However, the product is still often referred to as ERW pipe, even though the weld may have been produced by the HFI process. The API is a standard of American which is a standard used for transportingoil, gas.These pipe is popular with the importer around the world.