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Seamless Carbon Boiler Tubes to ASTM A210 Specification
The ASTM A210 standard outlines the specifications for seamless steel boiler tubes and superheater tubes, which are medium-carbon steel products. These tubes are commonly used in applications that require high strength and durability, such as in the construction of boilers and superheaters. The product range includes safe-end tubes, minimum-wall-thickness arch tubes, and support tubes, available in various dimensions. The manufacturing process involves a seamless production technique, with the option of either hot or cold working to achieve the desired properties. Customization is possible to meet specific customer requirements.
Testing requirements include tensile testing, flattening tests, expansion tests, hardness testing, as well as hydraulic or non-destructive electrical testing. The delivery status options are annealed, normalized, or normalized and tempered. Surface treatments can include oil immersion, varnish application, passivation, phosphating, or shot blasting. These tubes are suitable for use in high, medium, and low-pressure boiler systems and other pressure-related applications.
**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 & Tolerance:**
For **hot rolled** tubes:
| OD Range (mm) | Tolerance (mm) |
|-----------------------|-----------------------|
| OD ≤ 101.6 | +0.4 / -0.8 |
| 101.6 < OD ≤ 127 | +0.4 / -1.2 |
For **cold drawn** tubes:
| OD Range (mm) | Tolerance (mm) |
|-----------------------|-----------------------|
| OD < 25.4 | ±0.10 |
| 25.4 ≤ OD ≤ 38.1 | ±0.15 |
**Wall Thickness & Tolerance:**
For **hot rolled** tubes:
| OD Range (mm) | WT Range (mm) | Tolerance (%) |
|-----------------------|-----------------------|---------------|
| OD ≤ 101.6, WT ≤ 2.4 | +40 / -0 |
| OD ≤ 101.6, 2.4 < WT ≤ 3.8 | +35 / -0 |
For **cold drawn** tubes:
| OD Range (mm) | Tolerance (%) |
|-----------------------|-----------------------|
| OD ≤ 38.1 | +20 / -0 |
| OD > 38.1 | +22 / -0 |
These seamless carbon boiler tubes are designed to withstand the demanding conditions of industrial boilers while maintaining excellent mechanical properties. Whether you need hot or cold finished tubes, we ensure compliance with ASTM A210 standards and deliver quality products tailored to your needs.