API 5CT Oil Well Pipe - Durable Casing and Tubing

Kuaima Steel Co., Ltd.

Verified Custom manufacturer 7yrs

Technical Specifications of API 5CT Oil Well Pipe

Property	Parameter	Description
Product Name	API 5CT Oil Well Pipe	OCTG casing and tubing for oil and gas wells
Standard Compliance	API 5CT / ISO 11960	Primary international standard for well casing and tubing
Steel Grades	J55, K55, N80, L80, P110, C90, T95	Multiple grades for varying downhole conditions
Manufacturing Process	Seamless / ERW	Hot-rolled seamless or electric resistance welded
Carbon (C)	≤0.35% (J55/K55), ≤0.50% (P110)	Varies by grade per API 5CT specification
Manganese (Mn)	≤1.65%	Enhances strength and hardenability
Sulfur (S)	≤0.030%	Controlled for SSC resistance and toughness
Phosphorus (P)	≤0.030%	Restricted for improved ductility
Yield Strength (J55)	379 - 552 MPa	Minimum to maximum yield range per API 5CT
Yield Strength (N80)	552 - 758 MPa	Higher strength for deeper wells
Yield Strength (P110)	758 - 965 MPa	High-strength grade for demanding applications
OD Range	2-3/8" - 20" (60.3 - 508 mm)	Standard casing and tubing sizes available
Wall Thickness	3.18 - 16.13 mm	Per API 5CT dimensional tables
Length	R1 (4.88-7.62m), R2 (7.62-10.36m), R3 (10.36-14.63m)	Three standard range lengths
Thread Type	STC, LTC, BTC, Premium Connections	Short, long, buttress, and proprietary threads
Application	Oil & gas well casing, tubing, drilling operations	Onshore and offshore well construction
Certification	API 5CT, ISO 11960, EN 10204 3.1	Mill test certificate with full traceability
Packaging	Bundled with steel strips, thread protectors, plastic caps	Standard export packaging for OCTG products
MOQ	10 tons	Minimum order quantity

API 5CT Oil Well Pipe - Durable Casing and Tubing

API 5CT oil well pipe is an essential tubular product engineered for downhole operations in the petroleum and natural gas industry. Manufactured in strict compliance with the American Petroleum Institute Specification 5CT (ISO 11960), these pipes serve as the structural backbone of well construction—providing wellbore integrity, pressure containment, and corrosion protection across demanding subsurface environments. Whether you require casing strings for well stabilization or tubing for hydrocarbon extraction, our mill-direct API 5CT oil well pipe delivers reliable performance at factory-competitive pricing for global operators, drilling contractors, and OCTG distributors.

API 5CT oil well pipe supplier

What Is API 5CT Oil Well Pipe?

API 5CT oil well pipe refers to seamless or welded steel tubular goods—primarily casing and tubing—designed for use in oil and gas well drilling and completion. Governed by API Specification 5CT / ISO 11960:2020, this standard defines requirements for chemical composition, mechanical properties, thread profiles, and non-destructive testing to ensure safe, long-term service under high-pressure, high-temperature downhole conditions.

API 5CT oil well pipe wholesale

API 5CT Oil Well Pipe Technical Specifications

Our API 5CT casing and tubing products cover the full range of grades and dimensions specified by the standard. Below are key parameters:

Property	Specification Details
Standard	API 5CT / ISO 11960:2020
Steel Grades	J55, K55, N80-1, N80-Q, L80, C90, T95, P110, Q125
Outer Diameter	Tubing: 1.050″–4.500″ (26.67–114.30 mm); Casing: 4.500″–20.000″ (114.30–508.00 mm)
Wall Thickness	Per API 5CT Table C.23 / E.23, tolerance +12.5% / −12.5%
Yield Strength (P110)	758–965 MPa minimum to maximum
Yield Strength (J55)	379–552 MPa minimum to maximum
Thread Types	STC (Short Thread Coupling), LTC (Long Thread Coupling), BTC (Buttress Thread), Premium Connections
Length Range	R1 (4.88–7.62 m), R2 (7.62–10.36 m), R3 (10.36–14.63 m)
Testing	Hydrostatic test, full-length ultrasonic inspection, drift test per API 5CT Section 10

Key Applications of API 5CT Casing and Tubing

Surface Casing: Protects freshwater aquifers and provides structural support for the wellhead using grades J55 or K55.
Intermediate Casing: Isolates unstable formations and abnormal pressure zones, commonly employing N80 or L80 grade pipe.
Production Casing: Lines the productive interval to withstand reservoir pressures; P110 and Q125 grades find extensive application in deep and high-pressure wells.
Production Tubing: Conveys hydrocarbons from the reservoir to the surface; L80 and C90 grades offer exceptional durability against corrosive H₂S and CO₂ environments.

Why Choose Our API 5CT Oil Well Pipe

Full API Licensing: Manufactured under API Monogram Program per API Q1 quality management system.
Comprehensive Grade Coverage: From J55 through Q125, including sour-service grades (L80, C90, T95) conforming to NACE MR0175 / ISO 15156.
Rigorous Quality Control: Each pipe undergoes hydrostatic testing to 100% of API-specified pressures, full-body electromagnetic or ultrasonic inspection, and dimensional verification.
Global Supply Capability: Readily accessible inventory with export packaging and third-party inspection coordination for projects worldwide.

Frequently Asked Questions

What is the minimum order quantity (MOQ)?

Our standard MOQ for API 5CT oil well pipe is 20 metric tons per grade and size combination. For less common specifications such as Q125 or premium connections, please contact us for project-specific arrangements.

API 5CT oil well pipe China

Do you provide material test certificates?

Yes. Every shipment includes Mill Test Certificates (MTC) per EN 10204 Type 3.1, documenting chemical analysis, mechanical test results, hydrostatic test pressures, and NDE inspection records in full compliance with API 5CT requirements.

What is the typical delivery time?

Standard grades such as J55, N80, and P110 in common sizes are typically dispatched within 15–25 days from order confirmation. Sour-service grades and non-standard dimensions may require 30–45 days depending on mill scheduling.

Can you supply pipes with premium threaded connections?

Absolutely. Beyond standard STC, LTC, and BTC threads, we offer premium gas-tight connections engineered for high-torque, high-pressure, and deviated well applications—ensuring superior seal integrity under extreme downhole conditions.

Get a Competitive Quote for API 5CT Oil Well Pipe

Ready to secure top-tier OCTG products for your next drilling program? Contact our technical sales team today with your well design specifications—including grade, diameter, wall thickness, thread type, and quantity. We deliver value-driven pricing, rapid logistics, and dedicated project support from inquiry through final delivery.

Ratings & Reviews

5.0

Very satisfied

Based on 8 reviews for verified purchases

Supplier service

5.0

On-time shipment

5.0

Supplier service

5.0

Chris Martin

Canada

verified purchases

2025-02-14

Acceptable Quality with Thread Issue Resolved
Received 40 tons of J55 tubing, 2-3/8″ EUE. Found minor thread damage on about 5% of pipes, likely from handling during loading. Supplier arranged replacement pipes within 3 weeks and covered freight cost. Final product performed fine downhole in our Alberta shallow wells.

Wei Chen

Singapore

verified purchases

2025-03-10

Reliable P110 Casing for Southeast Asia Distribution
Placed a 50-ton order of P110 production casing, 7-5/8″ and 9-5/8″ OD mix, LTC threads for redistribution to operators in Indonesia and Vietnam. API monogram and all documentation were in order for customs clearance. Packaging was adequate but could use heavier-gauge thread protectors for long sea transit. Pricing competitive against three other Chinese mills we quoted.

William Taylor

Australia

verified purchases

2025-04-10

Good Value N80-1 Casing for CSG Wells
Ordered 35 tons of N80-1 casing, 7″ OD, BTC connection for coal seam gas wells in Queensland. Pricing was roughly 8% lower than our previous Korean supplier for equivalent spec. Thread quality and dimensional accuracy were solid. Minor delay of 4 days beyond the quoted 25-day lead time, but manageable given the overall cost savings.

Carlos Silva

Brazil

verified purchases

2025-04-28

Perfect J55 Surface Casing for Pre-Salt Drilling Program
Purchased 80 tons of J55 casing, 20″ OD, STC threads, R3 lengths for surface casing across three pre-salt wells. Compared quotes from 4 suppliers—this one offered the best combination of price, lead time, and documentation. Delivered in 15 days to Santos port. All MTC data verified by our third-party inspector on site. Will order K55 intermediate casing next quarter.

Ahmed Al-Hassan

UAE

verified purchases

2025-05-15

Premium C90 Tubing Performs Well in H₂S Environment
We sourced 25 tons of C90 production tubing, 3-1/2″ OD with premium gas-tight connections for a sour well in Abu Dhabi with 8% H₂S. Material fully conforms to ISO 15156 requirements. After 4 months downhole, zero corrosion issues reported. This is our 2nd order—first was L80 casing last year. Consistent quality from this mill.

Hans Mueller

Germany

verified purchases

2025-06-07

Excellent N80-Q Casing Delivered Ahead of Schedule
Procured 60 tons of N80-Q seamless casing, 13-3/8″ OD, LTC connection for a geothermal project in Bavaria. Hydrostatic test certificates confirmed 100% API-specified pressure compliance. Wall thickness measurements all within +/−10%, tighter than the allowed 12.5% tolerance. Delivery completed in 20 days, 5 days before our deadline. Drift testing records were included without us asking.

Michael Johnson

United States

verified purchases

2025-06-29

Outstanding Service on Urgent L80 Tubing Order
Needed 30 tons of L80-1 tubing, 2-7/8″ EUE 8rd, R2 lengths for a sour gas completion on a tight schedule. Their sales team confirmed NACE MR0175 compliance and coordinated SGS inspection within 48 hours of our request. Shipped in 22 days. EN 10204 3.1 certificates matched every heat number. Responsive communication throughout—exactly what we need from an OCTG supplier.

James Wilson

United Kingdom

verified purchases

2025-07-14

Superior P110 Casing for North Sea Deep Well
Ordered 45 tons of API 5CT P110 casing, 9-5/8″ OD, BTC threads for our 4,200m intermediate casing string. Yield strength tested at 793 MPa per the MTC, well within spec. Full-body UT inspection reports were thorough. Pipe arrived in 18 days with proper thread protectors and bundled packaging. Running the string went smoothly with zero connection issues downhole.