A192 Seamless Carbon Steel Boiler Tubes for High-Pressure Service Description
A192 high-pressure boiler tubes are seamless carbon steel tubes specifically designed for high-pressure boiler systems. They conform to ASTM A192/ASME SA192 standards and are suitable for operating pressures ≤9.8MPa and temperatures 450-650°C. They are primarily used in key components such as boiler heating surface piping, superheaters, and economizers.
A192 seamless tubes can be manufactured using either hot or cold working processes. Hot-worked tubes require no heat treatment, while cold-worked tubes require heat treatment at 1200°F (650°C) or higher after final cold working to eliminate internal stresses generated during cold working, improve the tube's microstructure and mechanical properties, and enhance its toughness and fatigue resistance.
Chemical Composition(%):
| C | Si | Mn | P | S |
|---|---|---|---|---|
| 0.06–0.18 | 0.25 max | 0.27–0.63 | 0.035 max | 0.035 max |
Mechanical Properities:
| Tensile Strength(Mpa) | Yield Strength(Mpa) | Elongation(%) | Hardness |
|---|---|---|---|
| 325 Min | 180 Min | 35 Min | 77 Max |
ASTM A192 Seamless, Cold-Finished Tubes Wall Thickness Tolerance
|
OD In. (mm) |
Wall thickness Tolerance % | |
|---|---|---|
| Over (+) |
Under (-) |
|
| 1 ½ (38.1) and under | 20 |
0 |
| Over 1½ (38.1) | 22 |
0 |
ASME SA192 Cold-Finished Seamless Tubes Outside Diameter Tolerance
|
OD In. (mm) |
Permissible Variations In. (mm) | |
|---|---|---|
| Over (+) |
Under (-) |
|
|
Under 1 (25.4) |
0.004 (0.10) | 0.004 (0.10) |
|
1 to 1 ½ (25.4 to 38.1), Incl |
0.006 (0.15) | 0.006 (0.15) |
|
Over 11⁄2 to 2 (38.1 to 50.8), Excl |
0.008 (0.20) | 0.008 (0.20) |
| 2 to 21⁄2 (50.8 to 63.5), Excl | 0.010 (0.25) |
0.010 (0.25) |
| 21⁄2 to 3 (63.5 to 76.2), Excl | 0.012 (0.30) |
0.012 (0.30) |
Test and inspection
Packaging and shipping
