High quality seamless steel pipe for oil field 1. Factory sell 2. OD: 10-630mm ... Pipe Co., Ltd. name seamless steel pipe for oil fieldBrand namedonghai steel pipeStandardAPI 5CT ,API 5L,ASTM A53 ... than 1000 tonsSurface treatmentBlack paint, yellow/transparent an-ti rust oil, galvanizedUsagePetroleum, chemical, power, gas, industrial, ship building, ... , High quality seamless steel pipe for oil field