ASTM A135 Pipe


ASTM A135 Steel Pipe

At UNIACERO, we proudly present our ASTM A135 electric-resistance-welded steel pipes, designed meticulously to cater to your needs in conveying gas, vapor, water, or other liquids. Crafted using the most advanced basic oxygen or electric furnace processes, our pipes stand as a testament to quality and durability. Our ASTM A135 range ensures optimal performance without the addition of any extraneous material. With a keen focus on ensuring that no untempered martensite remains post-welding, we’ve heat-treated the weld seam of our Grade B pipes. Dive into the specifics below to understand how our pipes can elevate your projects.

ASTM A135 Specification

Our ASTM A135 steel pipes come in two grades, aligning with international standards, ensuring flexibility in application, and providing reliable solutions for various applications, including those in the sprinkler system industry. With dimensions ranging from NPS 2 to NPS 30, our pipes are designed for diverse requirements. Manufactured using steel coils, our pipes undergo rigorous electric resistance or electric induction welding, ensuring a seamless finish without any added material. Especially noteworthy is the heat treatment post-welding for our Grade B pipes, ensuring durability and strength. Our carbon steel pipes are coated for enhanced protection, making them ideal for liquid systems, oil services, and pump applications. Whether you need plain, beveled, or threaded ends, our pipes cater to every need. Trust in UNIACERO for pipes that align with international standards and elevate your operations.

Production StandardASTM A135
Manufacturing ProcessesERW (Electric Resistance Welding)
Outside Diameter60.3mm – 406.4mm (2″ – 16″)
Wall Thickness1.65mm – 25.4mm (SCH 5S – SCH XXS)
Pipe Length5.8 – 45 meters
Steel GradeASTM A135 Gr. A/ASTM A135 Gr. B
Corrosion PreventionOiling, or a mill coating or a special coating
End ProcessesPlain, Bevelled, Threade
Further ProcessingWelding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding

ASTM A135 Dimension Table


Understanding the importance of precision, our ASTM A135 pipes are available in a range of dimensions. From NPS 2 to NPS 30, with wall thicknesses up to 0.500 in., we ensure that our pipes fit seamlessly into your projects. For specific sizes like NPS 3/4 to NPS 5, wall thickness varies between 0.083 in. to 0.134 in. Remember, while these are our standard dimensions, we’re always ready to cater to custom dimensions, ensuring that our pipes comply with all ASTM A135 specifications. With UNIACERO, you’re not just getting a product; you’re investing in precision.

TABLE X1.1 Dimensions, Nominal Weights (Masses), and Test Pressures for Light Wall Steel Pipe
NPSDNOutside Diameter, in. [mm]Schedule 10Test Pressure, psi [MPa]A
Specified Wall ThicknessA in. [mm]Weight (Mass) Per Unit Length lb/ft [kg/m]Grade AGrade B
3⁄4201.050 [26.7]0.083 [2. 11]0.86 [1.28]2500 [17  200]2500 [17  200]
1251.315 [33.4]0. 109 [2.77]1.41 [2.09]2500 [17  200]2500 [17  200]
11⁄4321.660 [42.2]0. 109 [2.77]1.81 [2.69]2400 [16  500]2500 [17  200]
11⁄2401.900 [48.3]0. 109 [2.77]2.09 [3. 11]2100 [14  500]2400 [16  500]
2502.375 [60.3]0. 109 [2.77]2.64 [3.93]1700 [11  700]1900 [13  100]
21⁄2652.875 [73.0]0. 120 [3.05]3.53 [5.26]1500 [10  300]1700 [11  700]
3803.500 [88.9]0. 120 [3.05]4.34 [6.46]1200 [8  200]1400 [9  600]
31⁄2904.000 [101.6]0. 120 [3.05]4.98 [7.41]1000 [6  900]1200 [8  200]
41004.500 [114.3]0. 120 [3.05]5.62 [8.37]900 [6  200]1100 [7  600]
51255.563 [141.3]0. 134 [3.40]7.78 [11.58]850 [5  900]1000 [6  900]
  • A    The test pressures are calculated by the following equation (but need not exceed 2500 psi or [17  200 KPa]):
  • P=2St/D
  • where:
  • P      =    pressure, psi [kPa],
  • S      =    fiber stress 60 % of the specified minimum yield strength, psi [kPa],
  • t        =    specified wall thickness, in. [mm], and
  • D      =    specified outside diameter, in. [mm].

Chemical Requirements of ASTM A135

At UNIACERO, we prioritize the chemical integrity of our ASTM A135 pipes. Each heat lot undergoes a thorough chemical analysis to ensure it meets the stringent requirements of the ASTM A135 standard. This meticulous approach guarantees that our pipes are not only durable but also resistant to various environmental factors. When you choose our pipes, you’re choosing quality, resilience, and peace of mind.

Chemical Requirements
ElementComposition, max, %
Grade AGrade B

Mechanical Requirements of ASTM A135

Mechanical strength is at the core of our ASTM A135 pipes. Each pipe is subjected to rigorous testing, ensuring it meets the mechanical requirements of the ASTM A135 standard. From tension tests to hydrostatic tests, leaving no aspect of mechanical strength unexamined, we leave no stone unturned in ensuring our pipes can withstand the pressures of your projects. From tensile strength to yield strength, our pipes are engineered to provide reliable and robust performance in diverse conditions. With UNIACERO, you can trust that strength and durability are inherent in our pipes.

Tensile Requirements
Mechanical PropertiesGrade AGrade B
Tensile strength, min, ksi [MPa]48 [330]60 [415]
Yield strength, min, ksi [MPa]30 [205]35 [240]
Elongation in 2 in. or [50 mm], min, %: For pipe having a specified wall thickness of 5⁄16  in. [7.9 mm] or more, if tested using a longitudinal strip test specimen.3530
For pipe having a specified wall thickness of less than 5⁄16  in. [7.9 mm], if tested using a longitudinal strip test specimen.AB
For pipe of any size, if tested using a full-size longitudinal test specimen.3530
A    The minimum elongation shall be determined by the following equation, with the calculated value rounded to the nearest percent:
E=elongation in 2 in. or [50 mm], minimum, %, and
t=specified wall thickness, in. [mm].
B  The minimum elongation shall be determined by the following equation, with the calculated value rounded to the nearest percent:
E=elongation in 2 in. or [50 mm], minimum, %, and
t=specified wall thickness, in. [mm].

Steel Grades in ASTM A135

Our ASTM A135 pipes are available in two distinct grades: Grade A and Grade B. While both grades are crafted for conveying gas, vapor, water, or other liquids, Grade A is uniquely adapted for flanging and bending, providing enhanced versatility in your projects. This versatility ensures that no matter the complexity of your project, our pipes are up to the task. On the other hand, Grade B is designed to meet the standard requirements of ASTM A135, offering reliable performance in conveying fluids. Both grades undergo rigorous testing, including tensile and chemical requirements, to ensure they comply with industry standards and UNIACERO’s commitment to quality.


Production Tolerance of ASTM A135

Weight (Mass)—The weight (mass) of any length of pipe other than Schedule 10 shall not vary more than 3.5 % under or 10 % over that specified, but the carload weight (mass) shall be not more than 1.75 % under the nominal weight (mass). The weight (mass) of pipe furnished to Schedule 10 shall not vary more than 610 % from that calculated using the weight (mass) per unit length. The weight (mass) of the pipe shall be calculated from the relevant equation in ASME B36.10M.

This production tolerance ensures that the weight (mass) of the pipes stays within specified limits, maintaining consistency and reliability in the manufacturing process. It is essential to adhere to these tolerances to meet the quality standards set by ASTM A135.

Diameter—The outside diameter shall not vary more than 61 % from the nominal size specified.

Minimum Wall Thickness—The minimum wall thickness at any point shall be not more than 12.5 % under the specified wall thickness.

Lengths: 12.4.1 Except as allowed in 12.4.2, pipe shall be furnished in lengths averaging 38 ft [11.6 m] or over, with a minimum length of 20 ft [6.1 m], but no more than 5 % may be under 32 ft [9.8 m]. Jointers made by welding are permissible. When threaded pipe is ordered, jointers shall be made by threaded connections and shall not exceed 5 % of the order.

Unless otherwise specified, Schedule 10 pipe shall be between 16 and 22 ft [4.9 and 6.7 m] for a minimum of 90 % of the footage furnished, with any balance being shorter lengths at least 8 ft [2.4 m] long

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.

Related Products



Our seamless pipes Range in sizes from 1/8 inches to 36 inches, they are produced using high-quality carbon or alloy steel.


ERW Pipe

Our carbon steel EAW pipe with an O.D. ranging from 21.3mm to 660mm and W.T. between 1.0mm to 20mm.



The dimensions of our SSAW steel pipes range typically from 20 inches to 80 inches (406mm to 2032mm) in diameter.



With dimensions ranging from an OD of 406 mm to 1626 mm and a thickness of 6.35 mm to 75 mm, our LSAW pipes cater to a diverse set of requirements.