N80-1石油套管钢
N80-1 Oil Case Pipe Steel
高抗挤毁石油套管
High Anti-collapse Oil Casing
石油套管
oil casing pipe
Petroleum casing pipe
oil casing
petroleum casing
oil casing tube
oil pipe
oil well pipe
Casting Pipe for Petroleum
Well casing
casing
oil tube
petroleum casing-pipe
casing connection
chemical composition
中国石油石油勘探开发科学研究院
Research Institute of Petroleum Exploration and Development
PetroChina
中国石油石油勘探开发科学研究院西北分院
Research Institute of Petroleum Exploration and Development
northwest institute
northwest sub-institute
northwest branch
PetroChina
中国石油石油勘探开发研究院
Petroleum Exploration and Development Research Institute
PetroChina
beijing
含Cr油套管钢
Cr-containing well tube steel