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API 5CT N80 Oil Casing Pipe for Petroleum Drilling Seamless Oilfield Steel Casing
| Category | Details |
| Product | API 5CT N80 Oil Casing Pipe |
| Standard | API 5CT |
| Grade | N80-1 / N80-Q |
| Manufacturing Type | Seamless / Electric Resistance Welded (ERW) |
| Application | Oil & gas well casing, drilling, wellbore reinforcement |
| Size Range | 4 1/2" – 20" (114.3 – 508 mm) |
| Wall Thickness | Customizable based on project requirement |
| Length | R1, R2, R3 (up to 12.19 m) |
| Thread Type | BTC / LTC / STC |
| Strength Level | High-strength casing for deep well operations |
| Surface Condition | Anti-corrosion oil / black painting / coating (optional) |
| Testing | Hydrostatic test, NDT, dimensional inspection |
| Packaging | Steel bundled with end caps, export seaworthy packing |
| Certification | API 5CT, MTC, third-party inspection (optional) |
| Grade | C (%) | Mn (%) | Si (%) | P (%) | S (%) |
| N80-1 | 0.34 – 0.45 | 1.25 – 1.50 | 0.20 – 0.35 | ≤ 0.030 | ≤ 0.030 |
| N80-Q | 0.34 – 0.45 | 1.25 – 1.50 | 0.20 – 0.35 | ≤ 0.030 | ≤ 0.030 |
| Grade | Condition | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
| N80-1 | Normalized | ≥ 552 | ≥ 689 | ≥ 18 |
| N80-Q | Quenched & Tempered | ≥ 552 | 689 – 758 | ≥ 18 |
API 5CT T95 Seamless Steel Tube Size Chart
| Outer Diameter (in / mm) | Wall Thickness (in / mm) | Schedule / Range | Remarks |
| 4 1/2" (114.3 mm) | 0.337" – 0.500" (8.56 – 12.7 mm) | SCH 40, SCH 80, XXH | Standard |
| 5" (127.0 mm) | 0.362" – 0.500" (9.19 – 12.7 mm) | SCH 40, SCH 80, XXH | Standard |
| 5 1/2" (139.7 mm) | 0.375" – 0.531" (9.53 – 13.49 mm) | SCH 40, SCH 80, XXH | Standard |
| 6 5/8" (168.3 mm) | 0.432" – 0.625" (10.97 – 15.88 mm) | SCH 40, SCH 80, XXH | Standard |
| 7" (177.8 mm) | 0.500" – 0.625" (12.7 – 15.88 mm) | SCH 40, SCH 80, XXH | Standard |
| 8 5/8" (219.1 mm) | 0.500" – 0.750" (12.7 – 19.05 mm) | SCH 40, SCH 80, XXH | Standard |
| 9 5/8" (244.5 mm) | 0.531" – 0.875" (13.49 – 22.22 mm) | SCH 40, SCH 80, XXH | Standard |
| 10 3/4" (273.1 mm) | 0.594" – 0.937" (15.08 – 23.8 mm) | SCH 40, SCH 80, XXH | Standard |
| 13 3/8" (339.7 mm) | 0.750" – 1.125" (19.05 – 28.58 mm) | SCH 40, SCH 80, XXH | Standard |
| 16" (406.4 mm) | 0.844" – 1.250" (21.44 – 31.75 mm) | SCH 40, SCH 80, XXH | Standard |
| 20" (508 mm) | 1.000" – 1.500" (25.4 – 38.1 mm) | SCH 40, SCH 80, XXH | Standard |
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PSL1 = Basic level, suitable for ordinary oil wells, with less stringent testing and control requirements and lower cost.
PSL2 = High level, used for oil wells under extreme conditions, with more stringent requirements for chemical composition, mechanical properties, and quality control.
| Feature | PSL1 | PSL2 |
| Chemical Composition | Basic control | Tight control |
| Mechanical Properties | Standard yield & tensile | Stricter consistency & strength |
| Testing | Routine tests | Additional tests & NDE |
| Quality Assurance | Basic QA | Full traceability & strict QA |
| Cost | Lower | Higher |
| Typical Application | Standard wells | High-pressure, high-temp, deep wells |
Summary:
API 5CT T95 seamless steel tubing is primarily used in demanding oil and gas well operations where high strength, toughness, and reliability are critical.
Oil Well Casing: Used to support borehole walls, prevent collapse, and ensure stable drilling and production operations.
Gas Well Casing: Provides high-pressure resistance and reliable sealing performance in natural gas extraction projects.
Wellbore Reinforcement: Strengthens the well structure and maintains integrity in deep and complex geological formations.
Formation Isolation: Prevents fluid cross-contamination between different underground layers, ensuring safe production.
Onshore & Offshore Drilling: Suitable for both land-based and offshore oil & gas projects, offering durability in harsh environments.
Raw Material Preparation
Select high-quality carbon steel billets.
Confirm chemical composition as T95 grade.
Heating
The billets are heated in a furnace to a suitable forging temperature (typically 1150-1250℃).
Hot Billet Piercing and Rolling
The hot billets are pierced to form hollow tubes.
The hollow tubes are then rolled on a seamless tube mill to the required dimensions (outer diameter) and wall thickness.
Sizing and Expansion Diametering
The tubes are fed into an expansion diametering mill to achieve tight dimensional tolerances (outer diameter and wall thickness).
Heat Treatment
Quenching and tempering are performed to obtain the required mechanical properties (tensile strength, yield strength, hardness, and toughness).
Straightening and Cutting
The tubes are typically straightened and cut to standard lengths (6-12 meters) or customer-specified lengths. High-quality connectors (NC, LTC, or custom threads) can be machined if required.
Non-destructive Testing (NDT)
Ultrasonic testing (UT) and magnetic particle testing (MPL) are methods used to ensure the structural integrity and defect-free nature of the pipes.
Packaging and Transportation
After being bundled, the pipes are coated with an anti-corrosion coating and packaged for transportation (suitable for container or bulk transport).
1.Full Range Steel Supply
From structural steel, sheet piles, steel pipes, API pipes, coils to tailored steel solutions for all your building and industry projects, we have an extensive range of products.
2.International Quality Standards
All the products are made according to the standards of ASTM, API, EN and JIS, which can guarantee quality continuously and are applicable for worldwide projects.
3.Stable Supply Chain &Production Capacity
We can ensure a stable production, high volume supply and reliable project delivery schedules with a strong factory support and integrated supply chains.
4.Cost-effective Provision Advantage
We deliver a value-for-money steel solution through streamlined procurement and production, to assist clients in lowering their overall project cost.
5.Americas Market Experience
We have a long track record of providing steel materials to infrastructure, port, warehouse, and energy projects throughout North, Central and South America.
Steel products are packaged according to international export standards to ensure safety, stability, and surface protection during long-distance transportation.
All materials are securely bundled with high-strength steel straps and reinforced to prevent deformation during handling and shipping. Protective end caps and waterproof wrapping are applied to prevent moisture, corrosion, and mechanical damage.
Standard export packaging includes seaworthy steel frames or wooden pallets, suitable for both container loading and bulk vessel shipment. Each bundle is clearly labeled with specification, grade, heat number, and size for full traceability.
We provide flexible logistics solutions based on project requirements, ensuring safe loading, efficient transport, and timely delivery to global destinations, especially across the Americas.
1. Applications of API 5CT N80 oil casing pipe
N80 casing is widely applied in oil and gas well operations. It serves wellbore reinforcement and fluid transmission, ideal for medium-depth wells that withstand higher pressure and load conditions.
2. N80 vs J55 / P110 Steel Grades
N80 features higher yield strength (552–758 MPa) than regular J55 and K55 grades, making it fit for deeper well drilling. Compared with high-strength P110, N80 delivers better overall toughness, offering a more cost-effective solution for medium-depth well projects.
3. N80-1 and N80Q Differences
N80-1 is normalized steel for conventional oil and gas well usage with stable general performance. N80Q adopts quenched and tempered heat treatment, providing improved toughness and collapse resistance. It is preferred for complex and harsh downhole conditions.
4. Sour Service Compatibility (H₂S Environment)
Standard N80 casing is not suitable for sour service with hydrogen sulfide. For H₂S-containing corrosive environments, we recommend NACE MR0175 qualified grades such as L80 to ensure safe and stable operation.
5. Available Sizes & Specifications
We supply a full range of API 5CT Casing Pipes compliant with PSL1 and PSL2 standards.
Casing outer diameter: 4 1/2" – 20"
Tubing outer diameter: 1.9" – 4 1/2"
Available lengths: R1, R2, R3
Common thread types: BTC, LTC, STC
6. Supplied Quality & Export Documents
We provide complete certification documents for customs clearance and project inspection, including official mill test certificates, chemical and mechanical test reports, and hydrostatic test records. Third-party inspection reports from SGS, BV, TUV and other authorized institutions are available upon request.
7. Reasons to Choose Royal Steel Group
Royal Steel Group delivers stable batch supply with strict API standard quality control. We offer factory-direct competitive pricing, flexible processing including cutting, threading and coating, and complete export document support. With efficient global delivery arrangements, we reliably serve international oil and gas engineering projects.
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