Seamless Carbon Boiler Tubes conforming to the ASTM A 210 standard are designed for use in medium carbon steel boiler and superheater applications. These tubes are available in various types, including safe end tubes, minimum wall thickness arch tubes, and support tubes, with a wide range of sizes to suit different requirements.
The manufacturing process is seamless, and the final product can be either hot-rolled or cold-drawn, depending on the desired mechanical properties and application. Customization options are available to meet specific client needs, ensuring flexibility and adaptability across industries.
Testing protocols include tensile testing, flattening test, expansion test, hardness testing, hydraulic testing, and non-destructive electrical testing, among others, to ensure quality and performance. The delivery condition can be annealed, normalized, or normalized and tempered, providing optimal strength and ductility. Surface treatments such as oil immersion, varnish coating, passivation, phosphating, and shot blasting are also available to enhance corrosion resistance and durability.
These tubes are ideal for use in high, medium, and low-pressure boilers, as well as other pressure-containing systems where reliability and performance are critical.
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 |
Outer Diameter and Tolerance:
| Hot Rolled | Outer Diameter, mm | Tolerance, mm |
|---|---|---|
| OD ≤ 101.6 | +0.4 / -0.8 | |
| 101.6 < OD ≤ 127 | +0.4 / -1.2 | |
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| Cold Drawn | Outer Diameter, mm | Tolerance, mm |
| 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 | |
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Wall Thickness and Tolerance:
| Hot Rolled | Outer Diameter, mm | Tolerance, % |
|---|---|---|
| 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 | Outer Diameter, mm | Tolerance, % |
| OD ≤ 38.1 | +20 / -0 | |
| OD > 38.1 | +22 / -0 |
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Baoji Qiyuexin Metal Material Co., Ltd. , https://www.qyxtitanium.com