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
chemical composition
Well casing
Casting Pipe for Petroleum
oil casing
petroleum casing
oil casing tube
casing
casing connection
oil tube
petroleum casing-pipe
oil pipe
oil well pipe
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
northwest sub-institute
Research Institute of Petroleum Exploration and Development
PetroChina
northwest branch
northwest institute
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