ASTM A178 Tube

Short Description:

Type: ERW steel pipe, Welded steel pipe
Specification: OD: 12.7-127mm. WT: 1.5-6.0mm. L.: 6-25m
Standard: ASTM A178, ASME SA178
Grade: Grade A, Grade C, Grade D
Technique: Electric-Resistance-Welded
Delivery Condition: Annealed, Normalized, Tempered, Heat Treatment, BK, BKS, BKW, NBK, GBK
Surface Treatment: Varnish
Ends: Plain End, Beveled End, Threaded Protected With Plastic Caps

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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(%)

ElementGrade A,Grade C,Grade D
Low-Carbon SteelMedium-Carbon SteelCarbon-Manganese Steel
Phosphorus, max0.0350.0350.03
Sulfur, max0.0350.0350.015
Silicon0.01 min

Mechanical Properties of ASTM A178 Steel Pipe

Grade 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 50mm, min, %353030
For longitudinal strip tests a deduction for1.50A1.50A1.50A
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

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  • Outside Diameter and Wall thickness Tolerance of ASTM A178 Steel Pipe

    Outside Diameter toleranceWall thickness tolerance
    OD < 50±0.05mmS < 4mm±12.5%
    OD > 50±1%4–20mm+15/-12.5%


    Application of ASTM A178 Steel Pipe

    - Heating pipelines
    - Containers
    - Coal-saving devices
    - Superheaters
    - Arch superheated tube
    - Airway tube

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