ASTM A178 is the standard specification covering minimum wall thickness electric resistance welded pipe. SA178 welded pipe is made of carbon steel and carbon manganese steel and is used for boiler tubes, boiler stacks, superheater stacks, and safety ends.
ASTM A178 steel pipe is subject to the electric resistance welding process. After welding, all pipes must be heat treated at a temperature equal to or greater than 1650°F [900°C] and then air cooled or cooled in a controlled atmosphere in a furnace.
ASTM A178 ERW steel pipe is available in three grades: Grade A - Low Carbon Steel, Grade C - Medium Carbon Steel, Grade D - Carbon Manganese Steel.
Products Data
Outside Diameter and Wall Thickness Tolerance of ASTM A178 ERW Steel Pipe:
|
Outside Diameter Tol |
Wall thickness Tol |
||
|
OD < 50 |
±0.05mm |
S < 4mm |
±12.5% |
|
OD > 50 |
±1% |
4--20mm |
+15/-12.5% |
|
S≧20mm |
±12.5% |
||
Chemical Composition of ASTM A178 ERW Steel Pipe:
| Element | ASTM A178/ ASME SA-178 | ||
| Grade A | Grade C | Grade D | |
| C | 0.06~0.18 | ≤0.35 | ≤0.27 |
| Mn | 0.27~0.63 | ≤0.80 | 1.00~1.50 |
| P | ≤0.035 | ≤0.035 | ≤0.030 |
| S | ≤0.035 | ≤0.035 | ≤0.015 |
| Si | - | - | ≥0.10 |
Products display
ASTM A178 Round Welded Carbon Steel pipe
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