ASTM A210 Specification for Seamless Carbon Boiler Tubes
The ASTM A210 standard outlines the requirements for seamless carbon steel boiler tubes and superheater tubes, which are typically made from medium carbon steel. These tubes are commonly used in a variety of industrial applications, including high, medium, and low-pressure boilers. The product range includes safe-end tubes, minimum wall thickness arch tubes, support tubes, and various tube sizes. The manufacturing process follows a seamless method, with the final product available in either hot-rolled or cold-drawn conditions. Surface finishes can be customized to meet specific customer needs.
Common delivery conditions include annealing, normalizing, and normalization followed by tempering. Surface treatments such as oil immersion, varnish coating, passivation, phosphating, and shot blasting are also available. This standard ensures that the tubes meet strict mechanical and chemical requirements, making them suitable for high-performance pressure 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 |
Outside Diameter and Tolerance:
| Hot Rolled | Outside Diameter, mm | Tolerance, mm |
|---|---|---|
| OD ≤ 101.6 | +0.4 / -0.8 | |
| 101.6 < OD ≤ 127 | +0.4 / -1.2 | |
| Â | Â | |
| Cold Drawn | Outside 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 | |
| Â | Â |
Wall Thickness and Tolerance:
| Hot Rolled | Outside 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 | Outside Diameter, mm | Tolerance, % |
| OD ≤ 38.1 | +20 / -0 | |
| OD > 38.1 | +22 / -0 |
Metal Shield,Riot Control Metal Shield,Aluminum Alloy Shield,Personal Protective Equipment Shield
skyshields(suzhou)thermoforming tech.co.ltd , https://www.skyshields.com