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Seamless Carbon Boiler Tubes to ASTM A 210 Specification
The ASTM A 210 standard applies to seamless steel boiler tubes and superheater tubes, which are medium carbon tube products. These tubes come in various forms such as safe-end tubes, minimum wall thickness arch tubes, and support tubes. Sizes vary depending on the application.
Manufacturing processes follow a seamless technique, and the final product can undergo either hot or cold working based on customer requirements. Customization is available to meet specific needs. Testing includes tensile tests, flattening tests, expansion tests, hardness tests, and either hydraulic or non-destructive electrical tests. Delivery conditions may involve annealing, normalizing, or normalizing and tempering. Surface treatments can include oil immersion, varnishing, passivation, phosphating, or shot blasting. These tubes are suitable for high, medium, and low-pressure boilers and other pressurized systems.
Chemical Composition:
| Grade | C (Max) | Mn (Max) | Si (Min) | P (Max) | S (Max) |
|-------|---------|----------|----------|---------|---------|
| A1 | 0.27 | 0.93 | 0.10 | 0.035 | 0.035 |
| C | 0.35 | 0.29-1.06| 0.10 | 0.035 | 0.035 |
Mechanical Properties:
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|-------|------------------------|----------------------|----------------|
| A1 | ≥ 415 | ≥ 255 | ≥ 30 |
| C | ≥ 485 | ≥ 275 | ≥ 30 |
Outside Diameter & Tolerance:
| Type | Outside Diameter (mm) | Tolerance (mm) |
|-----------|-----------------------|----------------|
| Hot Rolled| OD ≤ 101.6 | +0.4 / -0.8 |
| | 101.6 < OD ≤ 127 | +0.4 / -1.2 |
| Cold Drawn| OD < 25.4 | ±0.10 |
| | 25.4 ≤ OD ≤ 38.1 | ±0.15 |
| | 38.1 < OD < 50.8 | ±0.20 |
| | 50.8 ≤ OD < 63.5 | ±0.25 |
| | 63.5 ≤ OD < 76.2 | ±0.30 |
| | 76.2 ≤ OD ≤ 101.6 | ±0.38 |
| | 101.6 < OD ≤ 127 | +0.38 / -0.64 |
Wall Thickness & Tolerance:
| Type | Outside Diameter (mm) | Wall Thickness (mm) | Tolerance (%) |
|-----------|-----------------------|---------------------|---------------|
| Hot Rolled| OD ≤ 101.6, WT ≤ 2.4 | +40 / -0 | |
| | OD ≤ 101.6, 2.4 < WT ≤ 3.8 | +35 / -0 | |
| | OD ≤ 101.6, 3.8 < WT ≤ 4.6 | +33 / -0 | |
| | OD ≤ 101.6, WT > 4.6 | +28 / -0 | |
| | OD > 101.6, 2.4 < WT ≤ 3.8 | +35 / -0 | |
| | OD > 101.6, 3.8 < WT ≤ 4.6 | +33 / -0 | |
| | OD > 101.6, WT > 4.6 | +28 / -0 | |
| Cold Drawn| OD ≤ 38.1 | +20 / -0 | |
| | OD > 38.1 | +22 / -0 | |
These tubes are designed to withstand the rigors of high-pressure environments while maintaining excellent mechanical properties. They are manufactured to precise specifications, ensuring reliability and durability in critical applications. Whether you need custom dimensions or specific surface treatments, we can accommodate your requirements to ensure optimal performance in your boiler systems.