ERW API 5ST Coiled Tubing


API 5ST Coiled Tubing

API 5ST coiled tubing is your go-to solution for a wide range of oil and gas applications. Manufactured to meet the stringent quality standards in Grades CT70, CT80, CT90, CT100, and CT110, our coiled tubing offers unmatched durability and versatility. Whether you’re looking for work strings, completion strings, or static installations, our coiled tubing is designed to meet your specific needs. With wall thicknesses as specified in Table A.5, you can trust our product to deliver exceptional performance under extreme conditions.

Unlike other options, our tubing is manufactured using the continuously milled process, ensuring uniform quality and strength throughout the length of the coil. The manufacturing, inspection, and testing processes adhere to API Spec 5ST, providing companies with reliable and high-quality tubing for their exploration and production activities. Choose UNIACERO’s API 5ST coiled tubing for a reliable, high-performance solution that stands the test of time.

API 5ST Specification

When you choose our API 5ST coiled tubing, you’re investing in a product that comes with a comprehensive set of specifications to meet your project needs. Dimensions are meticulously designed, ranging from an outside diameter of 19.1 mm to 88.9 mm. Our production procedures adhere to the highest industry standards. Our API 5ST coiled tubing specifications encompass stringent quality control measures throughout the manufacturing process. These controls ensure that the material properties, including tensile strength and yield strength (measured in MPa), meet or exceed industry standards. The welded joints undergo a thorough inspection to guarantee downhole integrity. So that you can receive a product of unparalleled quality.

As part of our commitment to quality, we provide detailed information in our spec sheet, covering everything from material composition to manufacturing techniques. Our products adhere to the latest edition of industry standards, and our services extend beyond supplying tubing to include machining tools for customized downhole applications. Being available in various steel grades, our tubing also offers a range of surface coatings for added durability. End types and joint methods are customizable to suit your specific requirements. Additionally, we provide a full suite of machining services to make your installation process as smooth as possible.

API 5ST Dimension Table


Our API 5ST coiled tubing dimensions are carefully calibrated to offer you the most efficient and effective solutions for your operations. Our tubing is available in various lengths and is suitable for a wide range of applications in both carbon and low alloy steel, making it a versatile and durable solution for your projects. With outside diameters ranging from 19.1 mm to 88.9 mm, and wall thicknesses as outlined in the table below, you can find the perfect fit for your project. These dimensions are expressed to the thousandth of an inch (0.1 mm), ensuring precise measurements for your specific applications. Trust in UNIACERO to provide you with coiled tubing that fits seamlessly into your operations.

Coiled Tubing Dimensions
Outside DiameterWall Thickness mm

Chemical Requirements of API 5ST Coiled Tubing

At UNIACERO, we understand that the chemical composition of your coiled tubing is critical to its performance and longevity. Our API 5ST coiled tubing is manufactured using high-quality carbon and low alloy steel, which is tailored to withstand the harsh conditions encountered in drilling and completion operations, ensuring resistance to corrosion and high tensile strength. Each grade, from CT70 to CT110, has a specific chemical makeup that is rigorously tested to meet industry standards. The chemical requirements are meticulously controlled to guarantee the tubing’s suitability for various applications in oil and gas wells, including work strings, completion strings, and static installations. This ensures that you receive a product that not only meets but exceeds your chemical requirements, providing you with a durable and reliable solution for your oil and gas operations.

Chemical Requirement
GradeCarbon Max.Manganese Max.Phosphorus Max.Sulfur Max.Silicon Max.

Mechanical Requirements of API 5ST Coiled Tubing

Mechanical integrity is at the forefront of our API 5ST coiled tubing. Each grade undergoes stringent mechanical testing to ensure it meets the demands of your high-pressure oil and gas environments. From tensile strength to yield strength and elongation, our tubing is engineered to withstand the harshest conditions while maintaining its structural integrity. The mechanical properties of our coiled tubing are carefully controlled and verified through manufacturing inspection and testing processes that adhere to the API Spec 5ST standard. When you choose UNIACERO, you’re choosing a product that is built to last, reducing downtime and increasing your operational efficiency.

GradeYield Strength(min.)Yield Strength(min.)Tensile Strength(min.)Hardness Maximum
psiMpapsiMpapsiMpaBody and Weld HRC

Steel Grades in API 5ST Coiled Tubing

Our API 5ST coiled tubing is available in a variety of steel grades, including CT70, CT80, CT90, CT100, and CT110, providing optimal performance in various applications, including welded tubing segments, gas wells, and fusing procedures. Each grade is specifically designed to offer you a range of benefits, from increased corrosion resistance to higher tensile strength. Whether you’re operating in a corrosive environment or under high pressure, we have a grade that’s tailored to meet your needs. With UNIACERO, you can be confident that you’re getting a product that is perfectly suited to your specific operational challenges.

Professional Production Facilities Stringent Quality Control Customized Services Timely Delivery and After-Sales Support Continuous Innovation and Technological Upgrades,

Our Advantages

  1. Over 25 years of experience in pipeline production and installation.
  2. Comprehensive inspection equipment.
  3. Independent product serial numbers for traceability.
  4. Advanced production equipment – Seamer high-frequency welding machine from the United States.
  5. Complete qualifications – API 5L/API 5CT/FM/UL fire pipe certification, etc.
  6. Wide range of products – independently developed solar torque tubes, highly favored in the European market.
  7. Customers spread across the globe.
  8. Excellent after-sales service and sense of responsibility.

Application Scenarios

Our steel pipes are engineered to withstand high temperatures, corrosive environments, and varying pressures, ensuring reliability and safety in the complex petrochemical processes. 

Whether it’s transferring crude oil, natural gas, or chemical intermediates, the robustness and versatility of steel pipes make them indispensable components of the plant’s infrastructure, contributing to efficient production and maintenance of stringent safety standards.

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