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ASTM A178

Standard Overview: 

ASTM A178 specifies the requirements for electric resistance welded (ERW) carbon steel and carbon manganese steel boiler and superheater tubes. 

Main Material: 

The main materials are carbon steel and carbon manganese steel. The designated grades include: Grade A, Grade C and Grade D. 

Scope of Application: 

This standard applies mainly to high temperature and high pressure. It is for things like boilers, superheaters, and heat exchangers. 

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Specification of ASTM A178

StandardASTM A178/A178M
ProcedureERW
Dimensions12.7mm-127mm, 1/2″-5″
Thickness0.9mm – 9.1mm
Unit Length3 – 12 mtrs
Steel GradeASTM A178 Gr. A, ASTM A178 Gr. C, ASTM A178 Gr. D
Surface CoatingBlack lacquer coating,Varnishing, Oiling, Hot Dip Galvanizing, FBE, 2PP, 3PP, 2PE, 3PE
End TypePlain, Bevelled, Threaded, Grooved,Shouldered
Joint MethodFitting, Flange, Coupling, Clamp, Pipe Shoulder, Welding
Pipe MachiningWelding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding

Steel Grades of ASTM A178

We offer ASTM A178 boiler tubes in three distinct steel grades:

Grade A (low-carbon steel)

Mainly used for low temperature and medium pressure boiler and superheater tubes.

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Grade C (medium-carbon steel)

Suitable for boiler and superheater tubes at high temperature and high pressure.

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Grade D (carbon-manganese steel)

Suitable for high temperature and high pressure boiler and superheater tubes.

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Dimensions

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

Chemical Requirements
ElementComposition, %
Grade A, Low-Carbon SteelGrade C,Medium-Carbon SteelGrade D, Carbon-Manganese Steel
Carbon0 06–0 180 35 max0 27 max
Manganese0.27–0.630.80 max1.00– 1.50
Phosphorus, max0 0350 0350 030
Sulfur, max0.0350.0350.015
Silicon0. 10 min

Mechanical Requirement

Tensile Requirements
Mechanical PropertiesGrade AGrade CGrade 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, %353030
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.1.50A1.50A
A See Table 3 for the computed minimum values.
Minimum Elongation Values
Wall ThicknessElongation in 2 in. or 50 mm, min, %A
OD in.mm
5⁄16-0.312830
9⁄32-0.2817.229
1⁄4-0.256.427
7⁄32-0.2195.626
3⁄16-0.1884.824
5⁄32-0.156422
1⁄8-0.1253.221
3⁄32-0.0942.420
1⁄16-0.0621.618
A Calculated elongation requirements shall be rounded to the nearest whole number.

Why Choose UNIASEN?

  • ASTM A178 boiler tubes come in sizes tailored to your needs. They can be made with many procedures, including electric resistance welding.
  • Surface coatings enhance corrosion resistance, and a variety of end types and joint methods are available. Our processing services ensure that the tubes are ready for immediate installation.
  • UNIASEN’s ASTM A178 boiler tubes Grade C and D meet the tensile requirements. This ensures that the tubes can withstand the tough environments in boilers and superheaters.
  • Our tubes undergo rigorous testing, including flattening, flanging, stretching, etc., to verify their mechanical integrity.
  • Every aspect of production is closely monitored and controlled. This includes dimensions and chemical composition.
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