ASTM A209 Steel Pipe

At UNIACERO, we proudly present our ASTM A209 tubing, a premium carbon molybdenum alloy steel Seamless Tubing, meticulously designed for boilers, boiler flues, and superheaters. This product stands as a testament to our commitment to quality, ensuring optimal performance even in the most demanding environments. Beginning with the steel-making practice, our ASTM A209 tubing is made from killed steel, ensuring a uniform and defect-free material. Whether you’re in the energy sector, manufacturing, or any industry requiring robust boiler systems, our tubing promises unparalleled efficiency, safety, and longevity.

ASTM A209 Specification

Our ASTM A209 tubing is not just a product; it’s a culmination of precision engineering and rigorous quality control. Dimensions range from 1/2 to 5 inches in outside diameter and 0.035 to 0.500 inches in minimum wall thickness. We offer various steel grades, each tailored for specific applications. The surface coatings are meticulously applied to resist corrosion and wear. Clients can choose from diverse end types and joint methods, ensuring compatibility with varied systems. Additionally, we provide top-tier machining services, ensuring that our tubing integrates seamlessly into your operations.

Production StandardASTM A209
ApplicationSeamless carbon-molybdenum alloy-steel boiler and superheater tubes
Manufacturing ProcessSeamless
Steel GradeT1
Chemical composition
C:0.10-0.20C:0.15-0.25C:0.14 MAX
Mechanical propertyGr.T1Gr.T1aGr.T1b
Yield strength,ksi(MPa):≥30(205)Yield strength,ksi(MPa):≥32(220)Yield strength,ksi(MPa):≥28(195)
Tensile strength,ksi(Mpa):≥55(380)Tensile strength,ksi(Mpa):≥60(415)Tensile strength,ksi(Mpa):≥53(365)
Elongation in 2in or 50mm(%):≥30Elongation in 2in or 50mm(%):≥30Elongation in 2in or 50mm(%):≥30
ToleranceWall Thickness+/-10
Outer DiameterHot-finished seamless
4in(100mm) or under0.4mm-0.8mm
Over 4-7 1/2(100-200) incl0.4mm-1.2mm
Over7 1/2-9(200-225) incl0.4mm-1.6mm
Cold-finished seamless
Under 1 in(25)0.1mm-0.11mm
1-1 1/2in(25-40) incl0.15mm-0.15mm
1 1/2 -2in(40-50) excl0.2mm-0.2mm
2-2 1/2in(50-65) excl0.25mm-0.25mm
2 1/2-3in(65-75) excl0.3mm-0.3mm
3 – 4in(75-100) incl0.38mm-0.38mm
4 – 7 1/2in(100-200) incl0.38mm-0.64mm
7 1/2 – 9in(200-225) incl0.38mm-1.14mm

ASTM A209 Dimension Table


Understanding the importance of precision, our ASTM A209 tubing dimensions are crafted with utmost accuracy. Ranging from 1/2 to 5 inches [12.7 to 127 mm] in outside diameter and 0.035 to 0.500 inches [0.9 to 12.7 mm] in wall thickness, our tubes are designed to fit seamlessly into your systems. Each dimension is a result of careful consideration, ensuring optimal flow rates, pressure handling, and system efficiency. With UNIACERO, you’re not just getting a product; you’re investing in precision.

Outside Diameter:1⁄2 to 5 in. [12.7 to 127 mm]
Wall Thickness:0.035 to 0.500 in. [0.9 to 12.7 mm]

Chemical Requirements of ASTM A209

At UNIACERO, we understand that the chemical composition of our ASTM A209 tubing plays a pivotal role in its performance. Our tubes are formulated with a specific blend of carbon and molybdenum, ensuring high resistance to temperature variations and corrosive environments. This meticulous chemical composition ensures that our tubes can withstand the rigors of high-pressure boiler systems, offering you reliability and peace of mind.

Chemical Composition Requirements
ElementComposition, %
Grade T1Grade T1aGrade T1b
Carbon0.10–0.200.15–0.250.14 max
Phosphorus, max0.0250.0250.025
Sulfur, max0.0250.0250.025

Mechanical Requirements of ASTM A209

Mechanical integrity is at the heart of our ASTM A209 tubing. We ensure that each tube meets stringent tensile and hardness requirements. From the tension tests conducted on every lot of 50 tubes to the flattening, flaring, and Brinell or Rockwell hardness tests on selected samples, we leave no stone unturned. With UNIACERO’s tubing, you benefit from a product that promises durability, resilience, and optimal performance under pressure.

Tensile Requirements
Mechanical PropertiesGrade T1Grade T1bGrade T1a
Tensile strength, min, ksi [MPa]55 [380]53 [365]60 [415]
Yield strength, min, ksi [MPa]30 [205]28 [195]32 [220]
Elongation in 2 in. or 50 mm, min, %303030
For longitudinal strip tests a deduction shall be made for each 1⁄32-in. [0.8-mm] decrease in wall thickness below 5⁄16 in. [8 mm] from the basic minimum elongation of the following percentageWhen standard round 2-in. or 50-mm gage length or smaller proportion ally sized specimen with the gage length equal to 4D (four times the diameter) is used1.50A 221.50A 221.50A 22

Steel Grades in ASTM A209

We offer ASTM A209 tubing in various steel grades, including A209 Grade T1, A209 Grade T1A, and A209 Grade T1B. Each grade is tailored to specific applications, ensuring optimal performance and longevity. Our commitment to quality means that each steel grade is formulated to meet the unique demands of different boiler and superheater systems. With UNIACERO, you’re not just choosing a product; you’re choosing a partner committed to delivering excellence.

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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