ASTM A210 / ASME SA210 Grade C Carbon Steel Boiler Tube Seamless Superheater Tube
ASTM A210 / ASME SA210 Gr.C Carbon Steel Seamless Tube Steel Boiler Tube Superheater Tube
Comparison: A210 vs. Similar Grades
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vs. ASTM A179 (Heat Exchanger Tubes): A179 is low carbon (0.06-0.18% C), softer, and used for lower pressures and temperatures (like condensers). A210 is stronger and used for boilers.
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vs. ASTM A106 (Pipe): A106 is a pipe specification (pressure piping), while A210 is a tube specification (boiler/superheater). Tubes are generally smaller and held to tighter dimensional tolerances. Chemically, A106 Grade B is similar to A210 A-1, but the manufacturing focus (pressure pipe vs. boiler tube) differs.
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vs. ASTM A192 (Boiler Tube): A192 is a carbon steel boiler tube spec with a narrower carbon range (0.06-0.18%) and lower strength. A210 A-1 has a higher carbon ceiling (0.27%), giving it higher strength than A192. A210 is often chosen when higher mechanical properties are needed than A192 can provide.
Chemical Composition of ASTM A210 / ASME SA210 Grade C Carbon Steel Boiler Tube
|
Standard |
Grade |
ASTM A210 Chemical Compostion % |
||||
|---|---|---|---|---|---|---|
|
C |
Si |
Mn |
P |
S |
||
| ASTM A210 / ASME SA210 | C | ≤0.35 | ≥0.10 | 0.291.06 | ≤0.035 | ≤0.035 |
Mechanical Properties of ASTM A210 / ASME SA210 Grade C Carbon Steel Boiler Tube
|
ASTM A210/ASME SA210 Steel Grade |
Yield Strength (Mpa) |
Tensile Strength (Mpa) |
Elongation (%) |
|---|---|---|---|
| C | ≥275 | ≥485 | ≥30 |
Testing and Inspection
To qualify as A210 Gr.C, each lot of tubes must pass:
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Tensile Test: To verify the 485 MPa minimum.
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Hardness Test: To ensure it does not exceed 89 HRB.
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Flattening Test: To prove ductility for coiling and bending.
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Flange Test: To ensure the tube end can be expanded (rolled) into a boiler drum without cracking.
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Hydrostatic Test: To verify pressure integrity.
Due to its higher strength, Grade C is the preferred choice for the most thermally stressed parts of a boiler system:
- Superheater Tubes: The primary application. Superheaters raise the temperature of steam above its saturation point. This subjects the tube to the highest internal pressures and external gas temperatures. Grade C's strength resists creep (deformation under heat and stress).
- High-Pressure Boiler Tubes: Used in the hottest sections of the boiler water walls (riser tubes) where steam generation is most intense.
- Petrochemical Furnaces: Used in the radiant sections of heaters where metal temperatures are higher.
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