Development of Large-sized N80 Oil Casing of Non-quenched-and-tempered Steel

Described here in the article is the details about pilot manufacturing of N80 large-sized oil casing with the process involving use of non-quenched-and-tempered steel.The test operation result has proven that the manufacturing process flow as described by the co-authors is applicable for producing N80 oil casings up to relevant API specification.