High quality seamless steel pipe for oil field 1. Factory sell 2. OD: 10-630mm 3. ASTM ... an-ti rust oil, galvanizedUsagePetroleum, chemical, power, gas, industrial, ship building, constructionContact :Emily: 86-15066453209 ZGL GROUP Certificate: ISO9001,API ... 5CT-0816,API 5L-0602,High Pressure Equipment licens, High quality seamless steel pipe for oil field