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ASTM A178 is a specification for ERW steel pipe and carbon-manganese steel and superheater boiler steel tube. These tubes are primarily used in high-pressure applications in industries such as power generation and petrochemical. The ASTM A178 specification covers various grades and dimensions of tubes, ensuring their mechanical properties and suitability for the intended application.
Boiler Steel tube is used in these industries:
steam Boilers
Power Generation
Fossil Fuel Plants
Electric Power Plants
Industrial Processing Plants
Cogeneration Facilities
Boiler tubes need to withstand high pressure and temperature.
ASTM A178 carbon steel pipe are a kind of frequently-used tubes in our life, they are mainly used in manufacturing heating pipelines, containers, coal-saving devices, superheaters, arch superheated tube, airway tube etc.
Outside diameter and Wall thickness tolerance
|
Outside Diameter tolerance |
Wall thickness tolerance |
||
|
OD < 50 |
±0.05mm |
S < 4mm |
±12.5% |
|
OD > 50 |
±1% |
4--20mm |
-120 |
|
|
|
S≧20mm |
±12.5% |
ASTM A178 steel pipe and tube is to be used in boiler tubes, boiler flues, superheater flues and safe ends.
Chemical Requirements
|
Element |
Grade A |
Grade C |
Grade D |
|
% |
Low carbon steel |
Medium Carbon Steel |
Manganess Steel |
|
C |
0.06-0.18 |
0.35 Max |
0.27 Max |
|
Mn |
0.27-0.63 |
0.80 Max |
1.00-1.50 |
|
P |
0.035 |
0.035 |
0.03 |
|
S |
0.035 |
0.035 |
0.015 |
|
Si |
... |
... |
0.10 Min. |
Tensile Requirements
Grade C and D tubes shall conform to the requirements as to tensile properties
|
Data |
GradeC |
GradeD |
|
Tensilestrength,min,ksi[MPa] |
60[415] |
70[485] |
|
Yieldstrength,min,ksi[MPa] |
37[255] |
40[275] |
|
Elongationin2in.or50mm,min,% |
30 |
30 |
|
For longitudinal strip tests a deduction for Each1⁄32-in[0.8mm]decreaseinwallthicknessbelow5⁄16in.[8mm] |
1.50A |
1.50A |
The actual mean wall is defined as the average of the thickest and thinnest wall in that section.
Welded tubes65 %
|
Type |
Over |
Under |
|
Welded Tubes |
0.18 |
0 |
Mechanical Property:
Grade C & Grade D tubes shall conform to the requirements -tensile properties prescribed below:
|
Type |
Over |
Under |
|
Welded Tubes |
0.18 |
0 |
Application Industries
A178 Boiler Pipes & Tubes are used in boiler, superheater, heat-exchanger and pressure equipment in Petrochemical factory, Refinery factory, sugar mill, power plant, power plant, shipbuilding.Used in boiler, superheater, heat-exchanger and pressure equipment in Petrochemical factory, Refinery factory, sugar mill, power plant, power plant, shipbuilding.
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Main Product:
Seamless Steel Pipe,
Welded Steel Pipe ,
Casing and Tubing,
Carbon Steel Pipe,
Stainless Steel Pipe,
Alloy Steel Pipe
