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API 5CT J55 K55 N80 L80 C90 P110 Oil Well Casing Pipes – High Strength, High Pressure Resistance, Corrosion Resistance
| API 5CT J55 K55 N80 L80 C90 P110 Seamless Steel Pipe Product Detail | |
| Grades | J55 K55 N80 L80 C90 P110 |
| Specification Level | PSL1 / PSL2 |
| Outer Diameter Range | 4 1/2" – 20" (114.3mm – 508mm) |
| Wall Thickness (Schedule) | SCH 40, SCH 80, SCH 160, XXH, API standard custom thickness |
| Manufacturing Types | Seamless |
| Ends Type | Plain End (PE), Threaded & Coupled (TC), Threaded (pin & box) |
| Length Range | 5.8m – 12.2m (customizable) |
| Protection Caps | Plastic / Rubber / Wooden Caps |
| Surface Treatment | Natural, Varnished, Black Painted, Anti-Rust Oil Coating, FBE, 3PE (3LPE), 3PP, CWC (Concrete Weight Coated) CRA Clad or Lined |
| Grade | C (Carbon) | Mn (Manganese) | P (Phosphorus) | S (Sulfur) | Si (Silicon) | Cr (Chromium) | Mo (Molybdenum) | Ni (Nickel) | Cu (Copper) | Remarks |
| J55 | 0.28 max | 1.20 max | 0.035 max | 0.035 max | 0.25 max | – | – | – | – | Low strength, shallow wells |
| K55 | 0.28 max | 1.20 max | 0.035 max | 0.035 max | 0.25 max | – | – | – | – | Similar to J55 |
| N80 | 0.33 max | 1.40 max | 0.035 max | 0.035 max | 0.35 max | – | – | – | – | Medium strength, deep wells |
| L80 | 0.27–0.33 | 1.25 max | 0.035 max | 0.035 max | 0.25 max | Optional | Optional | – | Optional | Corrosion-resistant options available |
| C90 | 0.30–0.36 | 1.40 max | 0.035 max | 0.035 max | 0.30 max | Optional | Optional | – | Optional | High strength, high-pressure wells |
| P110 | 0.28–0.38 | 1.40 max | 0.030 max | 0.030 max | 0.30 max | Optional | Optional | Optional | Optional | High strength, deep/high-pressure wells |
| Grade | Yield Strength (YS) | Yield Strength (YS) | Tensile Strength (TS) | Tensile Strength (TS) | Remarks |
| ksi | MPa | ksi | MPa | ||
| J55 | 55 | 380 | 75–95 | 515–655 | Low strength, shallow wells |
| K55 | 55 | 380 | 75–95 | 515–655 | Similar to J55, widely used |
| N80 | 80 | 550 | 95–115 | 655–795 | Medium strength, deep wells |
| L80 | 80 | 550 | 95–115 | 655–795 | Corrosion-resistant options available |
| C90 | 90 | 620 | 105–125 | 725–860 | High strength, high-pressure wells |
| P110 | 110 | 760 | 125–145 | 860–1000 | High strength, deep/high-pressure wells |
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.
| Application Area | Description |
| Oil & Gas Well Casing | Used as high-strength casing for deep and ultra-deep wells to support wellbore integrity under high pressure and temperature. |
| Oil & Gas Tubing | Serves as production tubing for oil and gas extraction, ensuring safe and efficient fluid transport. |
| Drilling Operations | Supports drilling in harsh environments, including high-pressure, high-temperature (HPHT) wells. |
| Deepwater & Offshore Wells | Ideal for deepwater and offshore applications due to high tensile strength and corrosion resistance. |
| High-Pressure & High-Temperature Wells | Suitable for extreme conditions where standard tubing cannot withstand mechanical stress and temperature. |
RAW MATERIAL PREPARATION
Selection of high-quality carbon steel billets.
Verification of chemical composition to meet T95 grade requirements.
HEATING
Billets are heated in a furnace to the proper forging temperature (typically 1150–1250°C).
PIERCING & ROLLING
Hot billets are pierced to form a hollow shell.
Shells are then rolled using a seamless tube mill to achieve the desired outer diameter (OD) and wall thickness.
SIZING &STRETCH REDUCING
Tubes are passed through stretch-reducing mills to meet precise OD and wall thickness tolerances.
HEAT TREATMENT
Quenching and tempering to achieve required mechanical properties (tensile strength, yield strength, hardness, and toughness).
STRAIGHTENING & CUTTING
Tubes are straightened and cut to standard lengths (6–12m) or customer-specified lengths. Premium connections (NC, LTC, or custom threads) are machined if required.
NON-DESTRUCTIVE TESTING (NDT)
Methods such as ultrasonic testing (UT) and magnetic particle inspection (MPI) ensure structural integrity and defect-free tubing.
PACKAGING & SHIPPING
Tubes are bundled, protected with anti-corrosion coating, and packed for transport (suitable for container or bulk shipment).
Spain-Language Option Local Support: Our local office in Madrid delivers expert services in the Spanish language providing a seamless import process and a fantastic customer experience for customers throughout Central and South America.
Available Inventory: Reliable We keep a large quantity on hand of steel pipe so we can fill your order quickly to help enable you a timely project completion.
Safe Packaging: Every pipe is individually wrapped and sealed with layers of bubble wrap, which is also packed with plastic bag, the pipe can not get any deformation or damage during transportation, this will make sure the product safety.
Fast & Efficient Delivery: We offer international delivery aligned to your project schedule with dependable on-time delivery on robust logistics support.
Premium Steel Tubing Packaging & Shipping to Central America
Robust Packaging: Our steel tubes are well packed in IPPC-fumigated wooden pallets which conform to the export standards of Central America. Each package has a three-layer waterproof membrane to resist the humid tropical climate, while the plastic end caps prevent dust and foreign matter reach inside the tubes. Unit loads are 2 to 3 tons that fit smaller cranes like those are widely utilized on construction jobsites in the area.
Custom Length Options: The standard length is 12 meters, which can be easily transported by container. You can also find the shorter lengths of 10 meters or 8 meters due to tropical land transport limitations in countries such as Guatemala and Honduras.
Complete documentation & Service: We will provide all the documentation required for easy import such as Spanish Certificate of Origin (form B), MTC Material Certificate, SGS Report, Packing List and Commercial Invoice. Wrong documentation will be corrected and re-sent within 24 hours to ensureajana smooth custom clearance.
Dependable Shipping & Logistics: Upon production, good are handed to a neutral shipper who carries them by land and sea. Usual transit times are:
China → Panama (Colon Port): 30 days
China →Mexico( Manzanillo Port): 28 days
China → Costa RicaCosta Rica (Limon Port): 35 days
We also offer short-haul delivery from port to oil field or construction site, working with local logistics partners such as TMM in Panama to best handle last-mile transport.
1. What is API 5CT?
API 5CT is the industry standard for oil well casing and tubing, specifying the chemical composition, mechanical properties, and dimensions of steel pipes used in oil and gas wells.
2. What are the common grades of API 5CT casing and tubing?
The standard grades include J55, K55, N80, L80, C90, and P110, each with different strength and application ranges:
J55 / K55: Low strength, suitable for shallow wells.
N80 / L80: Medium strength, suitable for deep wells, with L80 offering corrosion-resistant options.
C90 / P110: High strength, suitable for high-pressure and deep wells.
3. What are the main applications of each grade?
J55 / K55: Shallow wells, low-pressure applications.
N80 / L80: Medium to deep wells, higher pressures; L80 for CO₂/H₂S environments.
C90 / P110: Deep, high-pressure wells and extreme environments.
4. Are these pipes seamless or welded?
Most API 5CT casing and tubing are seamless (SMLS) to ensure high-pressure strength, although some specialty welded variants exist.
5. Can API 5CT pipes be used in corrosive environments?
Yes. Grades like L80, C90, and P110 can be supplied as corrosion-resistant steel (CRS), designed for H₂S, CO₂, or high-chloride conditions.
6. How are API 5CT pipes tested?
They undergo mechanical tests (tensile, yield, elongation), chemical composition analysis, and NDT (Non-Destructive Testing) such as ultrasonic or magnetic particle inspection to meet API 5CT requirements.
Contact Details
Address
Kangsheng development industry zone,
Wuqing district, Tianjin city, China.
Phone
Hours
Monday-Sunday: 24-hour Service
