ASTM A178

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What is ASTM A178?

At UNIASEN, we are proud to offer ASTM A178 boiler tubes, a premium product that meets the rigorous standards of the international market.

These electric-resistance-welded carbon steel and carbon-manganese steel tubes are designed for use in boilers, superheaters, and other high-pressure applications.

With a focus on quality and reliability, our ASTM A178 tubes are manufactured with precision, ensuring minimum wall thickness and optimal performance.

Whether you require tubes for boiler flues or superheater flues, our products are heat-treated and cooled to provide unmatched durability. Choose UNIASEN’s ASTM A178 boiler tubes, and invest in the strength and efficiency that your projects deserve.

Specification

Our ASTM A178 boiler tubes are meticulously crafted to meet your specific needs. The dimensions are tailored to your requirements, with a variety of production procedures available, including electric-resistance welding. We offer steel grades A, C, and D, each with unique properties to suit different applications. Surface coatings are applied for enhanced corrosion resistance, and various end types and joint methods are available. Additionally, our machining services ensure that the tubes are ready for immediate installation. With UNIASEN, you receive a product that is not only compliant with international standards but also customized to your project’s needs.

  • Standard: ASTM A178/A178M
  • Procedure: ERW
  • Dimensions: 12.7mm – 127mm

                           1/2″ – 5″

  • Thickness: 0.9mm – 9.1mm
  • Unit Length: 3 – 12 mtrs
  • Steel Grade: ASTM A178  Gr. A, ASTM A178  Gr. C, ASTM A178  Gr. D
  • Surface Coating: Black lacquer coating,Varnishing, Oiling, Hot Dip Galvanizing

                                  FBE, 2PP, 3PP, 2PE, 3PE

  • End Type: Plain, Bevelled, Threaded, Grooved，Shouldered
  • Joint Method: Fitting, Flange, Coupling, Clamp, Pipe Shoulder, Welding
  • Pipe Machining: Welding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding

Dimension

Understanding the importance of precise dimensions, UNIASEN provides a comprehensive dimension table for our ASTM A178 boiler tubes. This includes detailed information on the outer diameter, wall thickness, length, and other critical measurements. Our dimension table is designed to assist you in selecting the perfect tubes for your specific application, ensuring a seamless fit and optimal performance. With UNIASEN, you can trust that the dimensions are accurate and consistent, eliminating any guesswork and allowing you to focus on what matters most – your project’s success.

Outside Diameter：

1⁄2 to 5 in. [12.7 to 127 mm]

Wall Thickness：

0.035 to 0.360 in. [0.9 to 9.1 mm]

Tubing having other dimensions may be furnished, provided such tubes comply with all other requirements of this specification.

Chemical Requirement

At UNIASEN, we adhere to strict chemical requirements for our ASTM A178 boiler tubes. This includes controlled compositions of carbon, manganese, phosphorus, sulfur, and silicon. By maintaining these precise chemical balances, we ensure that the tubes exhibit the desired characteristics such as corrosion resistance, strength, and durability. Our commitment to chemical integrity means that you can rely on our tubes to perform consistently under various operating conditions, providing you with the confidence and peace of mind you need in your industrial applications.

Chemical Requirements

Element

Composition, %

Grade A,
Low-Carbon
Steel

Grade C,
Medium-
Carbon Steel

Grade D, Carbon-
Manganese Steel

Carbon

0 06–0 18

0 35 max

0 27 max

Manganese

0.27–0.63

0.80 max

1.00– 1.50

Phosphorus, max

0 035

0 035

0 030

Sulfur, max

0.035

0.035

0.015

Silicon

–

–

0. 10 min

 

Mechanical Requirement

UNIASEN’s ASTM A178 boiler tubes are manufactured to meet specific mechanical requirements, including tensile strength, yield strength, and elongation. Grades C and D conform to given tensile requirements, ensuring that the tubes can withstand the demanding environments found in boilers and superheaters. Our tubes also undergo rigorous testing, including flattening, flange, tension, and more, to verify their mechanical integrity. When you choose UNIASEN, you are investing in a product that is engineered for resilience, providing long-lasting performance that you can count on.

Tensile Requirements

Mechanical Properties

Grade A

Grade C

Grade D

Tensile strength, min, ksi [MPa]

47 [325]

60 [415]

70 [485]

Yield strength, min, ksi [MPa]

26 [180]

37 [255]

40 [275]

Elongation in 2 in. or 50 mm, min, %

35

30

30

For longitudinal strip tests a deduction 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 percentage points shall be
made.

–

1.50A

1.50A

A  See Table 3 for the computed minimum values.

 

Minimum Elongation Values

Wall Thickness

Elongation in 2 in. or 50
mm, min, %A

OD

  in.

mm

5⁄16

(0.312)

8

30

9⁄32

(0.281)

7.2

29

1⁄4

(0.250)

6.4

27

7⁄32

(0.219)

5.6

26

3⁄16

(0.188)

4.8

24

5⁄32

(0.156)

4

22

1⁄8

(0.125)

3.2

21

3⁄32

(0.094)

2.4

20

1⁄16

(0.062)

1.6

18

A  Calculated  elongation  requirements  shall  be  rounded  to  the  nearest  whole
number.

 

Steel Grades

We offer ASTM A178 boiler tubes in three distinct steel grades: Grade A (low-carbon steel), Grade C (medium-carbon steel), and Grade D (carbon-manganese steel). Each grade is carefully selected to match your specific needs, providing the right balance of strength, flexibility, and resistance to wear. With UNIASEN, you have the freedom to choose the steel grade that best aligns with your project requirements, ensuring optimal performance and longevity. Trust in our expertise to guide you to the perfect solution.

Production Tolerance

Precision is at the core of UNIASEN’s manufacturing process, and our ASTM A178 boiler tubes are produced with tight tolerances to ensure a perfect fit and flawless performance. From the dimensions to the chemical composition, every aspect of the production is closely monitored and controlled. Whether it’s the wall thickness or the surface finish, our production tolerances are maintained within strict limits, providing you with a product that meets your exact specifications. Choose UNIASEN for ASTM A178 boiler tubes, and experience the quality and precision that sets us apart in the global market.

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