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OCTG Coupling The coupling is manufactured by seamless process, mainly used in underground engineering requiring pulling tubing & casing. Our company improved coupling processing process, sel ected standard datum plane during coupling processing, assured the axiality. We also improved the phosphorizing process, the phosphorized film is uniform and dense, has good anti-rust performance, the thread surface quality has been improved, enhanced the hardness and wear resistance, reduced thread gluing, extended the service life of tubing, casing and coupling.
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版權所有 ? 寧波全貿信息技術有限公司 浙ICP備12012821號-1 浙B2-20200628