API 5CT N80 Type Q Tubing Pipe
API 5CT N80 Type Q is a specific grade of oil country tubular goods (OCTG) used primarily for oil and gas extraction. The "N80" refers to its yield strength (80,000 psi), and the "Type Q" designates the heat treatment process: Quenched and Tempered.
Compared to N80 Type 1 (which is typically normalized), N80-Q has superior toughness and impact resistance, making it more reliable for higher-pressure environments and critical wells.
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API 5CT N80 Type Q Specification Table
| Item | Details |
| Standard | API Spec 5CT (American Petroleum Institute) |
| Steel Grade | N80 Type Q |
| Heat Treatment | Quenched and Tempered (Q&T) |
| Product Type | Tubing (for production) and Casing (for well lining) |
| Manufacturing | Seamless (S) or Electric Welded (EW) |
| PSL Level | PSL-1 (Standard), PSL-2, or PSL-3 |
| End Finish | NU (Non-upset), EU (External upset), or Premium Connections |
N80 Type Q Chemical Composition & Mechanical Strength
API 5CT mandates strict limits for impurities, while the manufacturer adjusts alloying elements (like Cr, Mo, and Mn) to ensure the steel hardens correctly during quenching.
Chemical Composition (Mass Fraction %)
| Grade | Carbon (C) | Manganese (Mn) | Phosphorous (P) | Sulfur (S) | Silicon (Si) |
| N80-Q | Manufacturer defined | Manufacturer defined | ≤ 0.030% | ≤ 0.030% | ≤ 0.45% |
Mechanical Property Table
| Property | Imperial Units | Metric Units |
| Yield Strength (Min - Max) | 80,000 – 110,000 psi | 552 – 758 MPa |
| Tensile Strength (Min) | 100,000 psi | 689 MPa |
| Hardness (Typical) | 18 - 24 HRC | 215 - 250 HBW |
| Impact Energy (Charpy V) | Required per wall thickness | Required per wall thickness |
| Elongation | Based on specimen area | Based on specimen area |
N80 Type Q Size Chart
Common Tubing Sizes
| Outer Diameter (OD) | Weight (lb/ft) | Wall Thickness (mm) | End Connection |
| 2-3/8" (60.3mm) | 4.60 / 4.70 | 4.83 / 4.83 | NU / EUE |
| 2-7/8" (73.0mm) | 6.40 / 6.50 | 5.51 / 5.51 | NU / EUE |
| 3-1/2" (88.9mm) | 9.20 / 9.30 | 6.45 / 6.45 | NU / EUE |
| 4-1/2" (114.3mm) | 12.60 / 12.75 | 6.88 / 6.88 | NU / EUE |
Reference Inspection for N80 Type Q Tubing
Because N80-Q is used in more demanding environments, the inspection process is rigorous:
| Inspection Type | Description |
| NDT (Non-Destructive) | 100% Ultrasonic Testing (UT) or Magnetic Particle (MPI) for crack detection. |
| Hydrostatic Test | Every pipe is filled with water and pressurized to verify seal integrity. |
| Drift Test | A standard mandrel (drift) is passed through to ensure no internal obstructions. |
| Hardness Testing | Periodic testing to ensure the Q&T process was successful across the batch. |
| Visual Inspection | Checking for surface scale, pits, or thread damage. |
| Dimensional Check | Measuring OD, Wall Thickness, and Length to ensure they fall within tolerances. |
API 5CT N80Q tubing test equipments
API 5CT N80Q Oil well pipe factory
API 5CT N80Q casing and tubing certificate
FAQ
What is N80 Q material?
N80 Q represents a specific delivery condition for the N80 steel grade within the API 5CT standard. It refers to N80 casing that has undergone quench and temper heat treatment (quenching followed by tempering); its microstructure consists primarily of tempered sorbite, resulting in superior mechanical properties and uniformity.
What is the specification of API 5CT N80
API 5CT N80 is a medium-to-high-strength grade of oil casing and tubing steel widely utilized in the petroleum industry. It features a yield strength ranging from 552 to 758 MPa and a tensile strength of ≥689 MPa, with a chemical composition comprising 0.34%–0.43% carbon, 1.03%–1.75% manganese, and sulfur and phosphorus contents each ≤0.045%. It can be produced via hot rolling, hot expanding, or Electric Resistance Welding (ERW) processes, and is classified into two heat treatment types: N80-1 (normalized) and N80-Q (quenched and tempered).
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