China API 5CT Casing Pipe Manufacturers Suppliers Factory

Your Leading API 5CT Casing Pipe Supplier

Hebei Yongqiang Pipeline Co., Ltd is a professional steel pipe supplier integrating R&D, production, and sales. Our products include austenitic stainless steel pipe, duplex stainless steel pipe, alloy steel pipe, casing pipe, steel pipe fittings, steel flanges, etc. Our API 5CT casing pipe includes Q125 casing pipe, L80 13CR casing pipe, N80 Q steel casing pipe, K55 casing pipe, etc. API 5CT casing pipes, following the American Petroleum Institute's standard, are used to support the wellbore wall during drilling and production, ensuring the integrity of oil and gas wells and protecting against environmental contamination.

Why Choose Us

Rich Experience

Hebei Yongqiang Pipeline Co., Ltd was established in 2006, located in Cangzhou City, Hebei Province, China. We have more than ten years of export business experience.

Sales Market

Our company's business covers the Middle East, North Africa, South America, Southeast Asia, Central America and other regions, with an annual export value of more than 10 million US dollars.

24H Online Service

Our company can provide 24-hour service to discuss product parameters, prices, delivery dates, transportation and other details with customers.

Our Solutions

If it is confirmed that the quality loss is caused by us, we will reissue the unqualified product or make a cash compensation.

Types of API 5CT Casing Pipe

J55 Casing Pipe

J55 API-5CT casing is a relatively low grade of steel used in oil drilling. Widely used in shallow oil and gas exploration. Compared with other steel grades, it has low cost and a wider range of applications, and can generally be used in shallow wells, geothermal wells and water wells.

N80 Q Steel Casing Pipe

N80 Q Steel Casing Pipe is a medium grade among casing products. It is a medium grade steel casing widely used in oil and gas well drilling. It is known for its high durability and resistance to corrosion, crevice corrosion and stress cracking.

L80 13Cr Casing Pipe

L80 13Cr casing pipe, part of the API 5CT standard, is a quenched and tempered martensitic stainless steel casing pipe designed for corrosion resistance in sweet and mildly sour environments, particularly in oil and gas applications.

Q125 Casing Pipe

API 5CT Q125 Casing Tubing used for transport both crude oil and natural gas from oil and gas layer to the surface pipeline after drilling is completed. It has the ablility to bear the pressure produced by the exploitation process.

Parameters of API 5CT Casing Pipe

Product Name	API 5CT L80 9Cr Oil Casing Steel Pipe
Out Diameter	4 1/2”-20”(114.3-508mm)
Wall Thickness	5-30mm
Length	R1(4.88-7.62m), R2(7.62-10.36m), R3(10.36-14.63m)
Material Standard	API 5CT
Type of Connection	SC, LC, BC
Surface	Antirust Coating, color black, red, green etc.

Surface Treatment of API 5CT Casing Pipe

Antirust Coating

Epoxy Coatings: Applied via electrostatic spraying, these provide a smooth, durable barrier against chemical attack. They are ideal for deep, corrosive wells but require precise surface preparation.
Zinc Plating: Sacrificial protection where zinc corrodes before steel, suitable for moderate conditions like shallow wells or above-ground storage.
Coal Tar or Polyurethane Paints: Cost-effective options for temporary protection during transit or less severe downhole environments.

Color Coding

While not explicitly mentioned, API 5CT casing pipes often feature color-coded coatings to simplify field identification.
Black: May indicate plain-end pipes or basic antirust coatings.

Red: Signals premium thread connections.
Green: May denote specialized coatings for corrosive environments.

Impact Test of API 5CT Casing Pipe

The impact toughness of API 5CT casing pipe reflects the resistance of the metal to the external impact load. It is generally expressed by the impact toughness value (ak) and the impact energy (Ak), whose units are J/cm2 and J (joules) respectively.

Impact toughness or impact energy test is divided into three types: normal temperature, low temperature and high temperature impact test due to different test temperatures; according to the shape of the sample notch, it can be divided into "V"-shaped notch and "U" There are two types of notch impact tests.

Impact test: Use a sample of a certain size and shape under the impact load on the specified testing machine. Experiment with broken at the notch.

A. Shock absorption work Akv(u) The work absorbed when a metal pattern with a certain size and shape is broken under the action of shock load. The unit is Joule (J) or Kgf.m.

B. The quotient of the impact toughness value akv(u) divided by the cross-sectional area of the bottom of the sample at the notch. The unit is Joule/cm2 (J/cm2) or kilogram force.m/cm2 (Kgf.m/cm2).

Usage of API 5CT Casing Pipe

API 5CT casing pipe is used to support the oil and gas pipe wall and to ensure the drilling process and the post-completion wells' normal operation. Each well depending on the depth of drilling and geological conditions, uses several layers of casing.

After cementing casing to be used to go down, it is different from tubing, and drill pipe and can not be reused, a one-time consumable material.

Therefore, the casing consumption accounts for over 70% of all the oil well pipe. According by usage can be divided into the sleeve pipe, surface casing, casing, and production casing.

Packaging & Delivery

Packing	Plastic Film, Plastic Cap, Bundle, Woven bag, Wooden Case, Iron Frame
Shipping	By logistics; by automobile; by train; by shipping; by air.
Delivery	Within 3 days with stock, 15-50 days based on production
Payment	T/T, D/P, L/C at sight, Usance L/C etc.

Certificate

After-Sale Service

After the customer receives the product, if there is any objection to the product quality, we will communicate and resolve it in a timely manner.

If it is confirmed that the quality loss is caused by us, we will reissue the unqualified product or make a cash compensation.

FAQ

Q: What are the common failure modes of API 5CT casing pipes?

A: Collapse: Due to external pressure exceeding pipe strength.
Burst: Internal pressure surpassing yield strength.
Corrosion: Chemical attack from H₂S, CO₂, or brines.
Stress Cracking: Hydrogen-induced cracking in sour environments.

Q: How do I calculate the cost of API 5CT casing pipes?

A: Grade: Higher-strength grades are costlier.
Coatings: Epoxy adds 10–15% to the base price.
Logistics: Shipping costs.

Q: What surface coatings are mandatory for API 5CT casing pipes?

A: While antirust coatings are common, API 5CT does not mandate coatings unless specified by the buyer. Coatings depend on:(1)Environment: Epoxy for corrosive brines; galvanization for moderate exposure. (2)Transport: Temporary paints to prevent rust during transit.

Q: What is the primary purpose of API 5CT casing pipes?

A: API 5CT casing pipes are designed to support oil and gas wellbores, preventing collapse from external pressure, isolating different geological formations, and ensuring safe extraction of hydrocarbons. They are critical for maintaining well integrity and preventing environmental hazards.

Q: What factors should I consider when selecting API 5CT casing pipe dimensions?

A: Well Depth: Larger diameters shallow wells; smaller diameters for deep wells.
Wall Thickness: Higher collapse resistance for thick walls.
Thread Type: Buttress threads (BTC) for high torque; premium threads for gas-tight seals.

Q: How to Maintain API 5CT casing pipe?

A: To maintain API 5CT casing pipe, focus on regular visual inspections for defects, corrosion, and damage, along with dimensional checks and thread inspections, and consider using non-destructive testing methods like ultrasonic testing or magnetic particle inspection.

We're professional api 5ct casing pipe manufacturers and suppliers in China, specialized in providing high quality customized service. We warmly welcome you to buy or wholesale high-grade api 5ct casing pipe from our factory.

N80 Q Steel Casing Pipe, casing pipe borewell

API 5CT Casing Pipe