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Oil Country Tubular Goods (OCTG) – For Oil & Gas Well Production
API Monogram Licensed – Grades J55, N80, L80, P110
API 5CT Tubing Pipe OCTG Production Tubing J55 Tubing N80 Tubing L80 Tubing P110 Tubing Oil Well Tubing Well Completion API Monogram
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API 5CT Tubing Pipe
Oil Country Tubular Goods (OCTG) – For Oil & Gas Well Production
API Monogram Licensed – Grades J55, N80, L80, P110
Product Overview
API 5CT tubing pipe is a critical component of Oil Country Tubular Goods (OCTG) used in oil and gas well production operations. Tubing is the conduit through which oil, gas, and other formation fluids travel from the reservoir to the surface .
Unlike casing which is permanently cemented in place, tubing is removable for maintenance, workover, and replacement. Tubing must withstand:
Internal pressure from produced fluids
Corrosion from H₂S, CO₂, and formation water
Tensile loads from its own weight (can be 10,000-30,000+ feet long)
Erosion from sand and particulates
Cyclic loading from shut-in and production
Our API 5CT tubing is manufactured under strict API Q1 quality management system and carries the API Monogram, ensuring full traceability and compliance with international oilfield standards .
✅ API 5CT certified – Latest edition (10th Edition / ISO 11960)
✅ API Monogram licensed – Full traceability to heat and mill
✅ Seamless construction – No weld seam – pressure integrity
✅ Threaded and coupled – NUE, EUE, or premium connections
✅ 100% hydrostatic and NDT tested
✅ EN 10204 Type 3.1 MTC with full traceability
✅ Sour service grades available – L80 for H₂S environments
✅ Factory direct | Stock available | Fast delivery
Key Specifications
| Parameter | Details | ||
|---|---|---|---|
| Standard | API 5CT (10th Edition / ISO 11960) | ||
| Product Type | Oil Country Tubular Goods (OCTG) – Tubing | ||
| Grades | Group 1: J55, N80 (Type 1, Type Q) | ||
| Grades (cont.) | Group 2: L80 (1, 9Cr, 13Cr) | ||
| Grades (cont.) | Group 3: P110 | ||
| OD Range | 1.050″ – 4-1/2″ (26.7mm – 114.3mm) | ||
| Wall Thickness | 0.113″ – 0.500″ (2.9mm – 12.7mm) (per API 5CT tables) | ||
| Length Range | R1: 6.10 – 7.62m | R2: 7.62 – 10.36m | R3: 10.36 – 14.63m |
| Connection Type | NUE (Non-Upset), EUE (External Upset), or premium connections | ||
| Upset Type | Non-upset (NU), External upset (EU), Internal upset (IU) | ||
| Surface Finish | Black / Phosphate coated / Clear coated | ||
| End Finish | Threaded and coupled (T&C) |
Tubing vs Casing – Key Differences for OCTG
| Feature | Tubing | Casing |
|---|---|---|
| Function | Conduit for produced fluids | Structural wellbore support |
| Installation | Removable (for workover) | Permanently cemented |
| Diameter | Smaller (1.050″ – 4-1/2″) | Larger (4-1/2″ – 20″+) |
| Pressure | Higher internal pressure | Higher external (collapse) |
| Connection | NUE, EUE, premium | STC, LTC, BTC, premium |
| Removal | Yes (workover operations) | No (must be milled) |
💡 Key point: Tubing is the production conduit . Casing is the structural wellbore .
Available Grades – API 5CT Tubing
| Grade | Type | Yield (psi) | Yield (MPa) | Tensile (MPa) | Application |
|---|---|---|---|---|---|
| J55 | Tubing | 55,000 – 80,000 | 379 – 552 | ≥517 | Shallow wells, economical |
| N80-1 | Tubing | 80,000 – 110,000 | 552 – 758 | ≥689 | General purpose, moderate depth |
| N80-Q | Tubing (Quenched & Tempered) | 80,000 – 110,000 | 552 – 758 | ≥689 | Improved toughness |
| L80-1 | Tubing | 80,000 – 95,000 | 552 – 655 | ≥655 | Sour service (H₂S) |
| L80 9Cr | Tubing | 80,000 – 95,000 | 552 – 655 | ≥655 | Corrosion resistant (9% Cr) |
| L80 13Cr | Tubing | 80,000 – 95,000 | 552 – 655 | ≥655 | CO₂ corrosion resistant |
| P110 | Tubing | 110,000 – 140,000 | 758 – 965 | ≥862 | Deep wells, high pressure |
Physical property/laboratory test requirements per API 5CT: For all tubing grades, one sample per 200 tons (or each heat) is tested for hardness (HRC 22-35 depending on grade), flattening, and tensile properties.
📌 Key selection note: For sour service (H₂S) , select L80 Type 1 (≤23 HRC) . For CO₂ corrosion service , select L80 13Cr (13% Chrome) .
Chemical Composition – API 5CT Tubing (Typical Max Values)
| Grade | C max | Mn max | P max | S max | Si max | Cr | Mo | Others |
|---|---|---|---|---|---|---|---|---|
| J55 | 0.30 | 1.50 | 0.020 | 0.015 | — | — | — | — |
| N80 | 0.43 | 1.90 | 0.020 | 0.015 | 0.45 | — | — | V, Nb, Ti |
| L80 Type 1 | 0.43 | 1.90 | 0.020 | 0.010 | 0.45 | — | — | — |
| L80 13Cr | 0.22 | 1.00 | 0.020 | 0.010 | 1.00 | 12-14 | — | Ni ≤1.00 |
| P110 | 0.43 | 1.20 | 0.020 | 0.010 | 0.45 | 0.40-1.50 | 0.60-1.00 | — |
⚠️ Note: Stricter limits apply for sour service (H₂S) – P ≤0.015%, S ≤0.010% .
Mechanical Properties – API 5CT Tubing
| Grade | Yield Strength (psi) | Yield Strength (MPa) | Tensile (MPa min) | Hardness (HRC max) |
|---|---|---|---|---|
| J55 | 55,000 – 80,000 | 379 – 552 | ≥517 | — |
| N80-1 / N80-Q | 80,000 – 110,000 | 552 – 758 | ≥689 | — |
| L80 Type 1 | 80,000 – 95,000 | 552 – 655 | ≥655 | 23 HRC max |
| L80 13Cr | 80,000 – 95,000 | 552 – 655 | ≥655 | 23 HRC max |
| P110 | 110,000 – 140,000 | 758 – 965 | ≥862 | 30 HRC max |
📌 Hardness limits are critical for sour service . L80 Type 1 ≤23 HRC meets NACE MR0175/ISO 15156 for H₂S environments .
Key Advantages – API 5CT Tubing
| Feature | Benefit |
|---|---|
| API Monogram certified | Full traceability to heat and mill – audit-ready documentation |
| Seamless construction | No weld seam – pressure integrity for produced fluids |
| Multiple upset options | Non-upset (NU), External upset (EUE), Internal upset (IU) |
| Full range connections | NUE, EUE, and premium connections available |
| Sour service grades available | L80 Type 1 with ≤23 HRC meets NACE MR0175 |
| Corrosion resistant alloys | L80 13Cr for CO₂ corrosion environments |
| 100% hydrostatic and NDT tested | Guaranteed pressure integrity |
| Full traceability | EN 10204 Type 3.1 MTC with heat number |
| Stock availability | Common tubing sizes (2-3/8″, 2-7/8″, 3-1/2″) ready to ship |
API 5CT Tubing Sizes – Complete Reference Table
| OD (inch) | OD (mm) | Weight (lb/ft) | WT (inch) | WT (mm) | Connection | Grade Availability |
|---|---|---|---|---|---|---|
| 1.050″ | 26.7 | 1.15 | 0.113 | 2.87 | NUE | J55, N80 |
| 1.315″ | 33.4 | 1.70 | 0.133 | 3.38 | NUE | J55, N80 |
| 1.660″ | 42.2 | 2.40 | 0.140 | 3.56 | NUE | J55, N80, L80, P110 |
| 1.900″ | 48.3 | 2.90 | 0.145 | 3.68 | NUE, EUE | J55, N80, L80, P110 |
| 2-3/8″ | 60.3 | 4.70 | 0.190 | 4.83 | NUE, EUE | All grades (most common) |
| 2-7/8″ | 73.0 | 6.50 | 0.217 | 5.51 | NUE, EUE | All grades (most common) |
| 3-1/2″ | 88.9 | 9.30 | 0.254 | 6.45 | NUE, EUE | All grades (most common) |
| 4″ | 101.6 | 10.70 | 0.262 | 6.65 | NUE, EUE | J55, N80, L80, P110 |
| 4-1/2″ | 114.3 | 12.60 | 0.271 | 6.88 | NUE, EUE | J55, N80, L80 |
💡 Most popular tubing sizes: 2-3/8″, 2-7/8″, and 3-1/2″ represent over 80% of global tubing demand .
Connection Types – API 5CT Tubing
| Connection | Description | Upset Type | Application |
|---|---|---|---|
| NUE (Non-Upset) | Standard API 8-round threads, no pipe body upset | Non-Upset (NU) | Shallow wells, low pressure, economical |
| EUE (External Upset) | External upset on pipe end, thicker thread section, stronger connection | External Upset (EU) | Standard for most production wells |
| Premium Connections | Metal-to-metal seal, torque shoulder, proprietary designs | Varied | HPHT, sour gas, deep water, critical service |
| IU (Internal Upset) | Internal upset (less common) | Internal Upset (IU) | Special applications |
💡 Selection tip: EUE (External Upset) is the industry standard for most production tubing applications . NUE is used for shallower, lower pressure wells .
Tubing Grade Selection by Well Conditions
| Well Condition | Depth | H₂S (Sour)? | CO₂? | Recommended Grade | Hardness Limit |
|---|---|---|---|---|---|
| Shallow, sweet | No | No | J55 | — | |
| Moderate depth, sweet | 1,500-3,000m | No | No | N80 | — |
| Deep, sweet | >3,000m | No | No | P110 | — |
| Sour service (H₂S) | Any | Yes | No | L80 Type 1 | ≤23 HRC |
| CO₂ corrosion | Any | No | Yes | L80 13Cr | ≤23 HRC |
| Sour + CO₂ | Any | Yes | Yes | L80 13Cr + sour control | ≤23 HRC |
Quality Testing & Inspection – API 5CT Tubing
| Test | Standard / Method | Coverage |
|---|---|---|
| Hydrostatic Test | API 5CT, ISO 13678 | 100% |
| Ultrasonic Testing (UT) | ASTM E213 | 100% (seamless) |
| Electromagnetic (EMI) Inspection | API 5CT | 100% (optional) |
| Tensile Test | API 5CT / ISO 6892 | 1 per 200 tons or each heat |
| Hardness Test | Rockwell C (HRC) | 1 per 200 tons (critical for sour service) |
| Flattening Test | API 5CT | Per API frequency |
| Flange Test | API 5CT | Per API frequency |
| Dimensional Inspection | API thread gauges | 100% |
| Thread Inspection | Visual, API thread gauges | 100% |
Mill Test Certificate – API 5CT Tubing
API 5CT Certificate of Compliance – Standard (API Monogram licensed)
EN 10204 Type 3.2 – Available upon request (third-party: SGS, BV, TUV, DNV)
Traceability: Full traceability from melt to finished pipe (heat number → tube → coupling)
Material Test Report (MTR) – Includes heat number, chemical analysis, full mechanical properties (tensile, hardness, flattening, flange), NDT results, and thread inspection data
Processing Services – API 5CT Tubing
| Service | Description |
|---|---|
| Threading | API NUE, EUE, or premium connections |
| Upsetting | External upset (EUE) or non-upset (NUE) |
| Coupling supply | API couplings with same grade and connection |
| Thread protectors | Steel or plastic protectors on both ends |
| Surface coating | Black, phosphate, clear coat |
| Marking | API stencil per API 5CT requirement |
| End finishing | Threaded and coupled (T&C) or plain end |
Packaging & Shipping – API 5CT Tubing
| Item | Details |
|---|---|
| Packaging | Bundles with steel strapping (small OD) |
| Protection | Thread protectors (steel or plastic) on both ends |
| Marking | API stencil: Grade, size, weight, heat number, API monogram |
| Lead time | 7–15 days (stock sizes), 20–45 days (custom orders) |
| Port | Tianjin / Shanghai / Guangzhou |
Why Choose Our API 5CT Tubing?
| Advantage | Description |
|---|---|
| API Monogram licensed | Full API Q1 quality management system – audit-ready |
| Full grade range | J55, N80, L80, P110 – one-stop sourcing |
| Seamless construction | Pressure integrity for production service |
| Sour service capability | L80 Type 1 with ≤23 HRC meets NACE MR0175 |
| Corrosion resistant alloys | L80 13Cr for CO₂ corrosion environments |
| Complete connection options | NUE, EUE, and premium connections |
| Full thread inspection | API thread gauges – 100% check |
| Full traceability | EN 10204 3.1 MTC with heat number |
| Stock availability | Common tubing sizes (2-3/8″, 2-7/8″, 3-1/2″) ready to ship |
| Global export | Shipped to production operations worldwide |
Contact for Quote – API 5CT Tubing
Please provide the following details for your tubing program:
Grade : J55 / N80 / L80 / P110 (or specify _______)
Sour service required? : Yes / No
CO₂ corrosion? : Yes / No
OD (inch) : _______ (e.g., 2-3/8″, 2-7/8″, 3-1/2″)
Weight (lb/ft) : _______ (e.g., 4.70 lb/ft for 2-3/8″)
Connection : NUE / EUE / Premium (specify brand)
Upset Type : Non-upset (NU) / External upset (EU)
Length Range : R1 / R2 / R3
Quantity : _______ joints / meters / tons
Inspection : Standard / Third-party (SGS/BV/TUV/DNV)
📧 Email: yjhtrade@gmail.com
📞 WhatsApp: +86 15106174543
🌐 Website:
Reply within 24 hours.
FAQ – API 5CT Tubing
Q1: What is API 5CT tubing used for?
A: API 5CT tubing is used as the production conduit in oil and gas wells . Formation fluids (oil, gas, water) flow from the reservoir to the surface through the tubing string .
Q2: What is the difference between API 5CT tubing and casing?
A: Tubing is smaller diameter (1.050″ – 4-1/2″), removable, and carries produced fluids to surface . Casing is larger diameter (4-1/2″ – 20″+) , permanently cemented, and provides wellbore structural support .
Q3: What is the most common tubing size?
A: 2-3/8″, 2-7/8″, and 3-1/2″ are the most common tubing sizes , representing over 80% of global tubing demand .
Q4: What is the difference between NUE and EUE connections?
A: NUE (Non-Upset) – standard API 8-round threads, no pipe body upset, lower cost, suitable for shallow/low pressure wells . EUE (External Upset) – external upset on pipe end, thicker thread section, stronger connection, industry standard for most production wells .
Q5: Which grade should I choose for sour service (H₂S)?
A: L80 Type 1 with hardness ≤23 HRC meets NACE MR0175/ISO 15156 for sour service . Avoid N80 and P110 in H₂S environments .
Q6: Which grade should I choose for CO₂ corrosion?
A: L80 13Cr (13% Chrome) provides excellent resistance to CO₂ corrosion . Also suitable for mild H₂S environments with hardness control .
Q7: What is the maximum depth for J55 tubing?
A: J55 tubing is typically limited to shallow wells (
Q8: What is the difference between N80 Type 1 and N80-Q?
A: N80-1 – as-rolled or normalized . N80-Q – quenched and tempered (heat treated) for improved toughness and more uniform properties .
Q9: What is the maximum operating pressure for tubing?
A: Depends on grade, OD, weight, and connection type . EUE connections have higher pressure ratings than NUE . For high pressure, use EUE or premium connections .
Q10: Does API 5CT require sour service testing?
A: No, only when specified. For sour service, purchaser must specify “Sour Service” and hardness/chemical limits per API 5CT . We supply sour grades (L80) with ≤23 HRC hardness .
Q11: What are the standard length ranges for tubing?
A: R1: 6.10 – 7.62m | R2: 7.62 – 10.36m (most common) | R3: 10.36 – 14.63m .
Q12: Do you provide third-party inspection?
A: Yes. SGS, BV, TUV, DNV, or any customer-specified agency.
Q13: Do you provide premium connections?
A: Yes, VAM, Tenaris (Hydril), Hunting, or other premium threads – please specify brand and connection type.
Q14: Do you offer free samples?
A: 30cm sample (plain end) available for inspection. Full joint samples available on request (cost applies).
Related Products – OCTG (Oil Country Tubular Goods)
API 5CT Tubing – Production conduit (this product)
API 5CT Casing – Wellbore structural casing
API 5CT Couplings – Connecting tubing joints
API 7-2 Drill Pipe – Drill string for well drilling
API 5L Line Pipe – Pipeline transport of oil/gas
Premium Connections – VAM, Tenaris, etc.
Tags: API 5CT Tubing Pipe OCTG Production Tubing J55 Tubing N80 Tubing L80 Tubing P110 Tubing Oil Well Tubing Well Completion API Monogram
Quick Reference: API 5CT Tubing Grade Selection
| Well Type | Depth | Pressure | H₂S? | CO₂? | Recommended Grade | Connection |
|---|---|---|---|---|---|---|
| Shallow | Low | No | No | J55 | NUE | |
| Medium | 1,500-3,000m | Medium | No | No | N80 | EUE |
| Medium (sour) | 1,500-3,000m | Medium | Yes | No | L80-1 | EUE |
| Deep | >3,000m | High | No | No | P110 | EUE |
| CO₂ corrosion | Any | Varied | No | Yes | L80 13Cr | EUE |
| Sour + CO₂ | Any | Varied | Yes | Yes | L80 13Cr + sour | EUE |
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