ASTM A178 Tube
What is ASTM A178 Steel Pipe?
ASTM A178/A178M steel pipe, ASME SA178/SA178M steel pipe is the standard applicable to electric-resistance-welded carbon steel and carbon manganese steel boilers and superheater tubes.
ASTM A178 Standard covers minimum-wall-thickness, electric-resistance-welded tubes made of carbon steel and carbon-manganese steel intended for use as boiler tubes, boiler flues, superheater flues, and safe ends.
SA178 steel tubing sizes and thicknesses usually furnished to this specification are 1⁄2 to 5 in. [12.7 to 127 mm] in outside diameter and 0.035 to 0.360 in. [0.9 to 9.1 mm], inclusive, in minimum wall thickness. Tubing having other dimensions may be furnished, provided such tubes comply with all other requirements of this specification.
Chemical Compositions of ASTM A178 Steel Pipe(%)
|Element||Grade A,||Grade C,||Grade D|
|Low-Carbon Steel||Medium-Carbon Steel||Carbon-Manganese Steel|
Mechanical Properties of ASTM A178 Steel Pipe
|Grade A||Grade C||Grade D|
|Tensile strength, min, ksi [MPa]||47||60||70|
|Yield strength, min, ksi [MPa]||26||37||40|
|Elongation in 2 in. or 50mm, min, %||35||30||30|
|For longitudinal strip tests a deduction for||1.50A||1.50A||1.50A|
|Each1⁄32-in[0.8mm] decrease in wall thickness below 5⁄16in. [8mm]|
|From the basic minimum elongation of the following percentage points shall be made|
Outside Diameter and Wall thickness Tolerance of ASTM A178 Steel Pipe
|Outside Diameter tolerance||Wall thickness tolerance|
|OD < 50||±0.05mm||S < 4mm||±12.5%|
|OD > 50||±1%||4–20mm||+15/-12.5%|
Manufacturing Process of ASTM A178 Steel Pipe
Application of ASTM A178 Steel Pipe
- Heating pipelines
- Coal-saving devices
- Arch superheated tube
- Airway tube
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