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 | |
| Carbon | 0.06-0.18 | 0.35max | 0.27max |
| Manganese | 0.27-0.63 | 0.08max | 1.00-1.50 |
| Phosphorus, max | 0.035 | 0.035 | 0.03 |
| Sulfur, max | 0.035 | 0.035 | 0.015 |
| Silicon | … | … | 0.01 min |
Mechanical Properties of ASTM A178 Steel Pipe
| 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 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% |
| S≥20mm | ±12.5% | ||
Application of ASTM A178 Steel Pipe
- Heating pipelines
- Containers
- Coal-saving devices
- Superheaters
- Arch superheated tube
- Airway tube
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