Question 1: What material is N80-1 oil casing made of?
N80-1 oil casing is made of hardenable stainless steel, usually made of 42MnMo7 steel, which is a quenched and tempered steel. It has good resistance to carbon dioxide corrosion and seawater corrosion, so it is a commonly used steel in offshore oil and gas production.
Question 2: What are the characteristics of the yield strength and elongation of N80-1 oil casing?
The yield strength of N80-1 is 173-206MPa higher than that of J55. And on the same sample area, the elongation of N80-1 is higher than that of J55.
Question 3: What are the requirements for the dimensional accuracy of N80-1 oil casing?
In order to meet the use requirements, the dimensional accuracy of N80-1 oil casing, such as wall thickness and outer diameter, must be strictly specified. For example, the API specification of the American Petroleum Institute stipulates that the wall thickness error of oil casing is 0 - 12.5t%, and the national standard is ±12.5t; the outer diameter error is 0.5D% - 1.0D%, and the national standard is ±1.0D%.
Question 4: What is the color code of N80-1 oil casing?
When the length is greater than or equal to 1.8m, N80-1 is painted red; the entire coupling, N80-1 oil casing is painted red; N80-1 has no color band.
Question 5: What is the heat treatment process of N80-1 oil casing?
N80-1 overall and full-length heat treatment is a mandatory requirement, and the manufacturer can choose normalizing (N) or normalizing + tempering (N&T).
Question 6: What is the difference between N80-1 oil casing and J55 oil casing in non-destructive testing methods?
The nondestructive testing methods for seamless pipes, coupling blanks, and welded pipe bodies of J55 and N80-1 are different, but the search results did not mention the specific differences.
