N80 steel pipe is a type of casing specifically designed for oil and gas drilling. It is mainly used for cementing operations and wellbore support, and conforms to standards such as API 5CT and SY/T6194-96. Its yield strength is 552-758MPa, tensile strength is ≥689MPa, and the surface must be smooth, corrosion-resistant, and free of folds, cracks, or other defects.
Mechanical Properties
|
Grade |
Tensile Strength(MPa) |
Yield strength(MPa) |
|
N80 |
≥689 |
552～758 |
Chemical Composition (Typical for N80-Q)
Carbon (C): 0.28-0.32%
Manganese (Mn): 1.30-1.45%
Silicon (Si): 0.17-0.37%
Chromium (Cr) (Max): 0.25%
Nickel (Ni) (Max): 0.20%
Copper (Cu) (Max): 0.20%
Vanadium (V): 0.07-0.12%
Phosphorus (P) (Max): 0.025%
Sulfur (S) (Max): 0.020%
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Specifications
Specification Range: Outer Diameter: 114.3MM-508MM (4 1/2"-20"); Wall Thickness: 5.21MM-16.13MM (9.5PPF-133PPF)
Material: N80-1, N80-Q
Standards: API 5CT, GB, ISO11960, GOST
Connection Types: STC, LTC, BTC, XC and Premium connection
Length: R1, R2, R3
Inspection: NDT and other related rules of API 5CT and 5B
Type: Seamless steel pipe, straight seam steel pipe
Applications
Wellbore Support: N80 oil casing is primarily used to support the wellbore during drilling and after completion, preventing formation collapse and ensuring smooth drilling operations and the normal operation of the entire well after completion.
Adaptability to Different Environments: Its high strength, good toughness, and excellent corrosion resistance enable it to adapt to the needs of different geological conditions and drilling environments, including medium-deep wells, deep wells, and corrosive media environments.
