Steel A182 F24-ANN (Annealed)
Heat-treated state
ASTM A182 F24 · UNS K30736
Use only as an intermediate condition at 150 HB for rough turning or cold forming; re-normalizing and tempering before service is mandatory to restore creep performance.
Values for the ANN condition
Other A182 F24 tempers and conditions
A182 F24 is listed in 3 conditions; see the grade overview at A182 F24.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ANNThis page Annealed | Use only as an intermediate condition at 150 HB for rough turning or cold forming; re-normalizing and tempering before service is mandatory to restore creep performance. | 330 | 520 | 27 | 150 HB | 8 % IACS |
N+TDefault Normalized and tempered | Pick the standard delivery condition, normalized at 980–1060 °C and tempered above 730 °C, for boiler header, nozzle and valve body forgings needing 470 MPa yield with balanced weldability. | 470 | 620 | 22 | 200 HB | — |
Quenched and tempered | Choose for thick-wall forgings that need a fully bainitic through-section and higher toughness after liquid quenching and tempering above 730 °C; hardness stays capped at 250 HB and machining gets harder. | 530 | 670 | 20 | 220 HB | — |
What is A182 F24-ANN?
A182 F24-ANN is A182 F24 heat treated to ANN — use only as an intermediate condition at 150 HB for rough turning or cold forming; re-normalizing and tempering before service is mandatory to restore creep performance. A182 F24-ANN has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 78% of steel grades. Elongation at break is 27% and the elastic modulus is 210 GPa (30.5 Msi). A182 F24-ANN has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,450°C (2,642 °F). N+T is the default condition FabDigit quotes; ANN is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 190 MPa·√m (172.9 ksi·√in), better than 99% of steel grades
- High service temperature — 500°C (932 °F), better than 90% of steel grades
- Ductile — tolerates forming and impact — 27%, better than 86% of steel grades
Limitations
- Low strength — 330 MPa (47.9 ksi), worse than 78% of steel grades
A182 F24-ANN properties
Typical room-temperature values for A182 F24-ANN; 22 are specific to this condition. Other listed values are A182 F24 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
A182 F24-ANN has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,450°C (2,642 °F).
Mechanical16
A182 F24-ANN has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 78% of steel grades. Elongation at break is 27% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
A182 F24-ANN is rated for continuous service to 500°C (932 °F). It conducts heat at 37 W/m·K (21.4 BTU/hr·ft·°F), worse than 71% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
A182 F24-ANN conducts electricity at 8 % IACS, better than 55% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (20/100), better than 87% of steel grades.
Sustainability4
Producing a kilogram of A182 F24-ANN takes about 32 MJ of energy and emits 2.4 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 25%.
Manufacturability7
A182 F24-ANN's machinability is good (60/100, better than 83% of steel grades); weldability good (60/100); formability fair (50/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with A182 F24-ANN
Is A182 F24 easy to machine?
At about 200 HB in the normalized-and-tempered condition, turn with coated carbide at vc ≈ 120–180 m/min. Vanadium and titanium carbides are mildly abrasive, so use rigid clamping and ample coolant.
Can A182 F24 be welded?
Use GTAW or SMAW with matching T24 consumables, 150–250 °C preheat and interpass at or below 300 °C. Walls of 10 mm or less can be welded without PWHT under a qualified procedure; heavier sections need tempering at 720–750 °C, and weld hardness should be held below about 350 HV to avoid reheat cracking and stress corrosion cracking.
Can A182 F24 be formed, bent or molded?
Hot forge or hot bend between 1150 and 900 °C and always normalize and temper after forging. Cold bending is limited to small deformations on annealed thin-wall tube.
What surface finishes work on A182 F24?
Cannot be anodized. Water- and flue-gas-side surfaces are protected by paint, sprayed aluminum or diffusion aluminizing, while the steam side relies on a dense oxide film. Shot peening improves fatigue life but must not damage surfaces in creep service.
A182 F24 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 |
|---|---|---|
| C | 0.05 – 0.1 | 0.08 |
| Si | 0.15 – 0.45 | 0.3 |
| Mn | 0.3 – 0.7 | 0.5 |
| P | ≤ 0.02 | 0.01 |
| S | ≤ 0.01 | 0 |
| Cr | 2.2 – 2.6 | 2.4 |
| Mo | 0.9 – 1.1 | 1 |
| Vcreep-strengthening carbide former | 0.2 – 0.3 | 0.25 |
| Tiprotects boron / grain refinement | 0.05 – 0.1 | 0.07 |
| B | 0 – 0.01 | 0 |
| N | ≤ 0.01 | 0.01 |
| Altotal aluminium | ≤ 0.02 | 0.01 |
| Nbwhere specified | ≤ 0.06 | — |
| Fe | balance | — |
A182 F24-ANN — frequently asked
What is A182 F24-ANN used for?
A182 F24-ANN is typically used for boiler header forgings, superheater components and steam piping fittings. In short: no PWHT on thin walls; creep upgrade over P22; 570 °C header forging grade.
What is the yield strength of A182 F24-ANN?
A182 F24-ANN has a typical yield strength of 330 MPa (47.9 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 78% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is A182 F24-ANN easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). At about 200 HB in the normalized-and-tempered condition, turn with coated carbide at vc ≈ 120–180 m/min. Vanadium and titanium carbides are mildly abrasive, so use rigid clamping and ample coolant.
Can A182 F24-ANN be welded?
Yes — weldability is rated good (60/100). Use GTAW or SMAW with matching T24 consumables, 150–250 °C preheat and interpass at or below 300 °C. Walls of 10 mm or less can be welded without PWHT under a qualified procedure; heavier sections need tempering at 720–750 °C, and weld hardness should be held below about 350 HV to avoid reheat cracking and stress corrosion cracking.
What surface finishes work on A182 F24-ANN?
Cannot be anodized. Water- and flue-gas-side surfaces are protected by paint, sprayed aluminum or diffusion aluminizing, while the steam side relies on a dense oxide film. Shot peening improves fatigue life but must not damage surfaces in creep service.
Can A182 F24-ANN be formed, bent or molded?
Hot forge or hot bend between 1150 and 900 °C and always normalize and temper after forging. Cold bending is limited to small deformations on annealed thin-wall tube.
What is the maximum service temperature of A182 F24-ANN?
A182 F24-ANN is rated for continuous use to about 500°C (932 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between A182 F24 N+T and A182 F24-ANN?
N+T is the default condition — pick the standard delivery condition, normalized at 980–1060 °C and tempered above 730 °C, for boiler header, nozzle and valve body forgings needing 470 MPa yield with balanced weldability. ANN: use only as an intermediate condition at 150 HB for rough turning or cold forming; re-normalizing and tempering before service is mandatory to restore creep performance. Yield strength is 470 MPa in N+T versus 330 MPa in ANN.
Sources
- ASTM A182/A182M — Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Fittings, Valves and Parts — ASTM International (2023)
- ASTM A335/A335M — Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service (P24) — ASTM International (2022)
- EN 10216-2 — Seamless steel tubes for pressure purposes, 7CrMoVTiB10-10 (1.7378) — CEN (2020)
- ASME BPVC Section II Part D — Physical and Allowable Stress Data — ASME (2023)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Vallourec / Salzgitter Mannesmann T24 (7CrMoVTiB10-10) tube data — producer (2019)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.