Next, the pipes are threaded and receive a strength enhancing copper plating. Nondestructive quality control inspection then takes place, after which the pipes are welded to tool joints. Pipes then undergo weld heat treatments and a weld finishing processes that removes welding stress.
The range of the pipes is from high pressure boiler seamless pipes, seamless pipes for petroleum & petrochemicals, high pressure gas cylinder pipes, to pipes for alloy structures, etc. StandardsAPI 5L, ASTM /ASME A/SA106, A53
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