ASTM A210 Specification for Seamless Carbon Boiler Tubes
ASTM A210 is a widely recognized standard that covers seamless carbon steel boiler and superheater tubes. These are medium-carbon steel products commonly used in pressure applications such as high, medium, and low-pressure boilers. The specification includes various types of tubes, such as safe-end tubes, minimum wall thickness arch tubes, and support tubes. The material manufacturing process follows a seamless method, and the final product can be either hot or cold worked, depending on the application requirements.
Surface conditions can be customized to meet specific needs, including oil immersion, varnish coating, passivation, phosphating, or shot blasting. Testing requirements include tensile testing, flattening test, expansion test, hardness testing, and hydraulic or non-destructive electrical testing, ensuring the quality and reliability of the tubes.
The delivery condition typically includes annealed, normalized, or normalized and tempered states, while surface treatments are available based on customer preferences. This standard ensures that the tubes meet strict performance and dimensional requirements for use in critical industrial 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 |
 |
| 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 |
 |
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 |
Fragrance For Candle
fragrance for candle,bulk fragrance oil for candle,fragrance for candle making,floral and fruity notes,candle spice ingredients
Guangzhou Dingjin Flavors & Fragrances Co.,Ltd , https://www.dingjinflavors.com