ASTM A209/A209M covers minimum-wall-thickness seamless carbon-molybdenum alloy-steel boiler and superheater tubes.
The standard includes Grades T1, T1a and T1b. All three contain 0.44–0.65% molybdenum, while their carbon content and mechanical-property requirements differ by grade.
Specified Standard Edition: ASTM A209/A209M-03(2022)
ASTM A209/A209M normally covers the following dimensions:
| Parameter | Size Range |
|---|---|
| Outside Diameter | 1/2–5 in. [12.7–127 mm] |
| Minimum Wall Thickness | 0.035–0.500 in. [0.9–12.7 mm] |
ASTM A209/A209M is a minimum-wall-thickness specification. The required minimum wall thickness should be clearly stated in the purchase specification.
| Element | T1 | T1a | T1b |
|---|---|---|---|
| Carbon (C) | 0.10–0.20% | 0.15–0.25% | ≤0.14% |
| Manganese (Mn) | 0.30–0.80% | 0.30–0.80% | 0.30–0.80% |
| Phosphorus (P) | ≤0.025% | ≤0.025% | ≤0.025% |
| Sulfur (S) | ≤0.025% | ≤0.025% | ≤0.025% |
| Silicon (Si) | 0.10–0.50% | 0.10–0.50% | 0.10–0.50% |
| Molybdenum (Mo) | 0.44–0.65% | 0.44–0.65% | 0.44–0.65% |
| Property | T1 | T1a | T1b |
|---|---|---|---|
| Minimum Tensile Strength | 380 MPa [55 ksi] | 415 MPa [60 ksi] | 365 MPa [53 ksi] |
| Minimum Yield Strength | 205 MPa [30 ksi] | 220 MPa [32 ksi] | 195 MPa [28 ksi] |
Applicable elongation requirements are determined in accordance with ASTM A209/A209M and the specimen dimensions.
| Wall Thickness | T1 — Maximum | T1a — Maximum | T1b — Maximum |
|---|---|---|---|
| ≥0.200 in. [5.1 mm] | 146 HBW | 153 HBW | 137 HBW |
| <0.200 in. [5.1 mm] | 80 HRBW | 81 HRBW | 77 HRBW |
ASTM A209/A209M establishes heat-treatment requirements for both hot-finished and cold-finished tubes.
The required delivery condition should be confirmed against the ordered grade and project specification.
Inspection and testing are carried out according to ASTM A209/A209M and the purchase specification.
Typical requirements include:
Additional UT or ET can be specified where required by the project.
Mill Test Certificates and applicable inspection records can be supplied with the order. Third-party inspection can be arranged upon request.
| Parameter | Capability |
|---|---|
| Grades | T1 / T1a / T1b |
| Manufacturing | Cold Drawn / Cold Rolled |
| Outside Diameter | 6–114 mm |
| Wall Thickness | 0.8–25 mm |
| Length | Up to 40 m |
| Inspection | Hydrostatic / UT / ET as specified |
| Documentation | MTC / EN 10204 documentation / TPI as required |
| Custom Sizes | Subject to technical review |
| MOQ | According to grade, size and production requirements |
ASTM standard scope and FYN manufacturing capability are stated separately. Size availability and standard compliance are confirmed against the ordered grade, dimensions, heat treatment and inspection requirements.
ASTM A209 seamless carbon-molybdenum alloy steel tubes are used in boiler and superheater systems where Mo-alloyed seamless tubing is specified.
For pressure-containing heat-transfer surfaces in industrial and power boilers.
For steam-heating sections where ASTM A209 carbon-molybdenum alloy steel is specified for the design conditions.
For applicable boiler heating surfaces within the specified temperature, pressure and material-design requirements.
For boiler OEM production, pressure-part fabrication, replacement tube bundles and maintenance projects.
Final material selection should follow the applicable boiler design code, design temperature, pressure, steam conditions and project material specification.
Available documentation can include:
Required documentation should be specified during the RFQ stage.
Typical export packing includes:
Long-length tubes may require special packing and transportation arrangements.
Production lead time depends on grade, dimensions, quantity, heat treatment, testing and inspection requirements.
For quotation, please specify:
ASTM A209/A209M + Grade + OD × Minimum Wall Thickness × Length + Quantity
The required grade should be clearly identified as T1, T1a or T1b.
| Required Information | Details |
|---|---|
| Standard | ASTM A209/A209M |
| Grade | T1 / T1a / T1b |
| Standard Edition | Required ASTM edition, if specified |
| Dimensions | Outside diameter × minimum wall thickness × length |
| Quantity | Required order quantity |
| Dimensional Tolerances | If applicable |
| Heat Treatment | If specified |
| Testing | Hydrostatic / NDT requirements |
| Documentation | MTC / EN 10204 requirements |
| Third-Party Inspection | If required |
| Delivery | Delivery destination |
For an accurate quotation, please send your required grade, outside diameter, minimum wall thickness, length and quantity.
For project enquiries, attach your tube list, drawing or technical specification, together with NDT, documentation and delivery requirements.
