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: DONGYING DAYANG PETROLEUM EQUIPMENT CO.,LTD ia a modernized industry,conbined manufacturing and development of seamless steel pipes and drilling equipment,drilling tools,drilling rig.founded in 1983.we have devoting in supplying oilfield products for twenty years. The specifications of oil pipes are as belows: OD:60.3mm-508mm Steel Grade:H40/J55/K55/N80/L80/P110 Thread Type:STC/BTC/LTC/VAM The specifications of oil pipelines are as below: OD:21.3mm-3032mm Steel Grade:Gr.B/X42/X46/X52/X56/X60/X70/X80 Usage:conveying oil,petroleum and water. Main business on Drilling Equipment: onshore oil drilling & extracting equipments and accessories; offshore oil drilling & extracting accessories; lighting and explosion proof equipments; special petroleum vehicles; output of petroleum technology & crews, etc