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ASTM A209 / ASME SA209 Alloy Steel Seamless Tube Boiler and Heat Exchanger Tube
ASTM A209/ASME SA209 specification covers seamless carbon-molybdenum alloy-steel boiler and superheater tubes, which can also be used as heat exchanger tubes. The specification covers grades T1, T1a, and T1b, which have different mechanical properties and are suitable for different applications.
Specification of A209 / A209M T1, T1a, T1b Alloy Steel Seamless Boiler and Heat Exchanger Tubes
| Product | T1, T1a, T1b Seamless Alloy Tubes |
| Specification | ASTM A209, ASME SA209 |
| Type | Seamless |
| Size | 6.35 mm to 101.6 mm |
| Thickness | 10 Swg., 12 Swg., 14 Swg., 16 Swg., 18 Swg., 20 Swg., 3.6 mm Thk |
| Length | Single Random Length, Double Random Length, or as customer’s requirement. |
| Grades | T1, T1a, T1b |
| Test Certificates | Material Test Certificates (MTC) as per EN 10204 3.1 and EN 10204 3.2 |
| Equivalent Designation | |||||
|---|---|---|---|---|---|
| DIN | EN | BS | NFA | ASTM | ASME |
| DIN 17175 Grade 16Mo5 | – | – – | ASTM A209 GradeT1 | ASME SA 209 Grade T1 | – |
ASTM A209/ ASME SA209 T1, T1a, T1b Alloy Steel SeamlessTubes Chemical Composition
| Grade | C | Mn | P | S | Si | Mo |
| T1 | 0.10-0.20 | 0.30-0.80 | ≤0.025 | ≤0.025 | 0.10-0.50 | 0.44-0.65 |
| T1a | 0.15-0.25 | 0.30-0.80 | ≤0.025 | ≤0.025 | 0.10-0.50 | 0.44-0.65 |
| T1b | 0.14 max | 0.30-0.80 | ≤0.025 | ≤0.025 | 0.10-0.50 | 0.44-0.65 |
Flattening Test
The flattening test of Specification A999/A999M shall be made on a specimen from one end or both ends of each pipe. Crop ends may be used. If this supplementary requirement is specified, the number of tests per pipe shall also be specified. One flattening test shall be made on specimens from each end of one finished tube, not the one used for the flaring test, from each lot.
Flaring Test
One flaring test shall be made on specimens from each end of one finished tube, not the one used for the flattening test, from each lot.
Hydrostatic or Nondestructive Electric Test
Each tube shall be subjected to the nondestructive electric test or the hydrostatic test. The type of test to be used shall be at the option of the manufacturer, unless otherwise specified in the purchase order.
Bend Test
For pipe whose diameter exceeds NPS 25 and whose diameter to wall thickness ratio is 7.0 or less shall be subjected to the bend test instead of the flattening test. Other pipe whose diameter equals or exceeds NPS 10 may be given the bend test in place of the flattening test subject to the approval of the purchaser
Alloy Steel Pipes Other Grades
| Steel Grade | Pipe | Tube | Fittings | Plate | Forgings |
|---|---|---|---|---|---|
| 1/2Mo | A335 P1 | A213 T1 | A234 WP1 | A182 F1 | |
| 5Cr-1/2Mo | A335 P5 | A213 T5 | A234 WP5 | A387 GRADE 5 | A182 F5 |
| 9Cr-1Mo | A335 P9 | A213 T9 | A234 WP9 | A387 GRADE 9 | A182 F9 |
| 1 1/4 Cr-1/2Mo | A335 P11 | A213 T11 | A234 WP11 | A387 GRADE 11 | A182 F11 |
| 2 1/4Cr-1Mo | A335 P22 | A213 T22 | A234 WP22 | A387 GRADE 22 | A182 F22 |
| 9Cr-1Mo-V-Nb | A335 P91 | A213 T91 | A234 WP91 | A387 GRADE 91 | A182 F91 |
Applications
the different grades of A209 tubes have varying properties that make them suitable for specific applications where high-temperature and/or high-pressure conditions are present. A209 T1, T1a, and T1b tubes are commonly used in high-temperature applications such as boilers, superheaters, and heat exchangers in power plants and other industries.
A209 T1 tubes are suitable for use in moderate to high-pressure applications and have good strength and toughness at elevated temperatures.
A209 T1a tubes have a higher tensile strength than T1 tubes and are often used in high-pressure applications.
A209 T1b tubes have the highest tensile strength among the three grades and are suitable for use in high-pressure and high-temperature applications, such as power generation equipment.
