Steel A209 T1
ASTM A209 T1 · UNS K11522
A209 T1 is a seamless carbon-molybdenum boiler and superheater tube steel (UNS K11522) supplied in the T1, T1a and T1b analyses, hot-finished or cold-drawn plus heat-treated.
Reference datasheet — A209 T1 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the T1 condition
A209 T1 tempers and conditions
A209 T1 is supplied in 5 conditions, soft to hard. T1 is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Grade T1b | Lowest-carbon variant: best bending, expanding and welding behaviour where strength is not critical. | 225 | 410 | 37 | 125 HB | 45 W/m·K |
Cold drawn then heat treated ≥650 °C | Standard condition for precision cold-drawn tube: tight tolerances and bright bore with drawing stresses removed. | 255 | 445 | 36 | 138 HB | 9 % IACS |
T1Default Cooled from hot working and naturally aged | Default A209 grade: 0.10–0.20 % C with 0.5 % Mo — standard choice for boiler and superheater tubes to ~500 °C. | 260 | 450 | 35 | 140 HB | — |
Grade T1a | Pick when higher room-temperature strength and allowable stress are needed; slightly reduced weldability and higher hardness cap (85 HRB). | 265 | 460 | 33 | 150 HB | 44 W/m·K |
Hot finished | Economical condition for hot-finished tube where A209 does not mandate post-forming heat treatment; slightly coarser scale-bearing surface. | 270 | 460 | 33 | 145 HB | 9 % IACS |
What is A209 T1?
A209 T1 is a seamless carbon-molybdenum boiler and superheater tube steel (UNS K11522) supplied in the T1, T1a and T1b analyses, hot-finished or cold-drawn plus heat-treated. It is chosen for elevated-temperature steam service where plain carbon tube loses strength, at lower cost than Cr-Mo tubing, and is stocked as seamless tube. Typical properties are 260 MPa yield, 450 MPa tensile, 35 % elongation and 140 HB, with service to about 510 °C, good weldability (score 75) and formability (score 68). It has no corrosion resistance and needs coating or aluminizing; step up to a Cr-Mo tube grade above its temperature limit. A209 T1 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,490°C (2,714 °F). A209 T1 has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 92% of steel grades. Elongation at break is 35% and the elastic modulus is 205 GPa (29.7 Msi).
What is A209 T1 used for?
- Boiler superheater tubes
- High-temperature piping
- Heat exchanger tubes
Advantages
- Ductile — tolerates forming and impact — 35%, better than 97% of steel grades
- High service temperature — 510°C (950 °F), better than 92% of steel grades
- Forms and bends easily — 68/100, better than 83% of steel grades
- Readily welded — 75/100, better than 76% of steel grades
Limitations
- Low strength — 260 MPa (37.7 ksi), worse than 92% of steel grades
A209 T1 properties
Typical room-temperature values for A209 T1-T1; bars are the position among steel grades.
Physical3
A209 T1 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,490°C (2,714 °F).
Mechanical16
A209 T1 has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 92% of steel grades. Elongation at break is 35% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
A209 T1 is rated for continuous service to 510°C (950 °F). It conducts heat at 44 W/m·K (25.4 BTU/hr·ft·°F), better than 57% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
A209 T1 conducts electricity at 9 % IACS, better than 71% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (13/100), better than 66% of steel grades.
Sustainability4
Producing a kilogram of A209 T1 takes about 26 MJ of energy and emits 2 kg of CO₂ — less than 64% of steel grades. Typical recycled content is 25%.
Manufacturability7
A209 T1's machinability is good (60/100, better than 83% of steel grades); weldability very good (75/100); formability good (68/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. A209 T1 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with A209 T1
Is A209 T1 easy to machine?
Machines like annealed 4130-class low-alloy steel at ~60 % of 1212 speeds; carbide tooling, moderate feeds, good chip control with coolant.
Can A209 T1 be welded?
Readily welded with matched C-Mo consumables (E7018-A1 / ER80S-D2); 100–200 °C preheat on heavier walls and PWHT near 700 °C for code work.
Can A209 T1 be formed, bent or molded?
Good cold bending and tube expanding in the annealed condition (A209 requires flattening and flaring tests); hot bends should be re-heat-treated.
A209 T1 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| CT1; T1a 0.15–0.25, T1b ≤0.14 | 0.1 – 0.2 | 0.15 |
| Mn | 0.3 – 0.8 | 0.55 |
| Si | 0.1 – 0.5 | 0.25 |
| Mocreep-strengthening addition, all grades | 0.44 – 0.65 | 0.52 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Fe | balance |
What surface finishes work on A209 T1?
No anodizing; use pickle/phosphate, aluminizing, or high-temperature silicone-aluminum paint for fireside and outdoor protection.
Surface treatments FabDigit runs on steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel A209 T1 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- K11522
- ASTM
- A209 Grade T1
How much does A209 T1 cost?
A209 T1 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
A209 T1 — frequently asked
What is A209 T1 used for?
A209 T1 is typically used for boiler superheater tubes, high-temperature piping and heat exchanger tubes. In short: low-cost C-Mo boiler tube; 510 °C service limit; good cold bending and expanding.
What is the yield strength of A209 T1?
A209 T1 has a typical yield strength of 260 MPa (37.7 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 92% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is A209 T1 easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machines like annealed 4130-class low-alloy steel at ~60 % of 1212 speeds; carbide tooling, moderate feeds, good chip control with coolant.
Can A209 T1 be welded?
Yes — weldability is rated very good (75/100). Readily welded with matched C-Mo consumables (E7018-A1 / ER80S-D2); 100–200 °C preheat on heavier walls and PWHT near 700 °C for code work.
What surface finishes work on A209 T1?
No anodizing; use pickle/phosphate, aluminizing, or high-temperature silicone-aluminum paint for fireside and outdoor protection.
Can A209 T1 be formed, bent or molded?
Good cold bending and tube expanding in the annealed condition (A209 requires flattening and flaring tests); hot bends should be re-heat-treated.
What is the maximum service temperature of A209 T1?
A209 T1 is rated for continuous use to about 510°C (950 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between A209 T1-T1 and A209 T1-T1b?
T1 is the default condition — default A209 grade: 0.10–0.20 % C with 0.5 % Mo — standard choice for boiler and superheater tubes to ~500 °C. T1b: lowest-carbon variant: best bending, expanding and welding behaviour where strength is not critical. Yield strength is 260 MPa in T1 versus 225 MPa in T1b.
How much does A209 T1 cost?
A209 T1 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ASTM A209/A209M — Seamless Carbon-Molybdenum Alloy-Steel Boiler and Superheater Tubes — ASTM International (2018)
- ASME BPVC Section II Part D — Properties (Metric), C-Mo steel allowable stresses and physical properties — ASME (2023)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.13 — Corrosion — ASM International (2005)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.