: 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-508mmSteel Grade:H40/J55/K55/N80/L80/P110Thread Type:STC/BTC/LTC/VAMThe specifications of oil pipelines are as below:OD:21.3mm-3032mmSteel Grade:Gr.B/X42/X46/X52/X56/X60/X70/X80Usage:conveying oil,petroleum and water.Main business on Drilling Equipment:onshore oil drilling &...