Steel A182 F1 N+T
Heat-treated state · default condition
ASTM A182 F1 · UNS K12822
N+T = normalized and tempered
Standard supply condition for F1 flanges and fittings; best combination of strength, toughness and elevated-temperature stability.
Values for the N+T condition
Other A182 F1 tempers and conditions
A182 F1 is listed in 4 conditions; see the grade overview at A182 F1.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Choose when maximum softness, machinability and dimensional stability are wanted; lowest strength within the spec minimums. | 300 | 500 | 31 | 148 HB | 8.4 % IACS |
N+TDefaultThis page Normalized and tempered | Standard supply condition for F1 flanges and fittings; best combination of strength, toughness and elevated-temperature stability. | 330 | 530 | 28 | 160 HB | — |
prior to final heat treatment (semi-finished forgings only) | Intermediate condition supplied for further machining and mandatory heat treatment; not acceptable for A182 code certification as-is. | 340 | 560 | 24 | 175 HB | 8.2 % IACS |
Quenched and tempered | Used for heavy-section forgings where uniform properties and higher low-temperature toughness are required. | 380 | 570 | 26 | 175 HB | 8 % IACS |
What is A182 F1 N+T?
A182 F1 N+T is A182 F1 heat treated to N+T — standard supply condition for F1 flanges and fittings; best combination of strength, toughness and elevated-temperature stability. A182 F1 N+T has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 78% of steel grades. Elongation at break is 28% and the elastic modulus is 205 GPa (29.7 Msi). A182 F1 N+T has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F).
Advantages
- High service temperature — 510°C (950 °F), better than 92% of steel grades
- Ductile — tolerates forming and impact — 28%, better than 89% of steel grades
Limitations
- Low strength — 330 MPa (47.9 ksi), worse than 78% of steel grades
A182 F1 N+T properties
Typical room-temperature values for A182 F1 N+T; 10 are specific to this condition. Other listed values are A182 F1 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
A182 F1 N+T has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F).
Mechanical16
A182 F1 N+T has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 78% of steel grades. Elongation at break is 28% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
A182 F1 N+T is rated for continuous service to 510°C (950 °F). It conducts heat at 43 W/m·K (24.8 BTU/hr·ft·°F), better than 51% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
A182 F1 N+T conducts electricity at 8.2 % IACS, better than 61% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of A182 F1 N+T takes about 30 MJ of energy and emits 2.2 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 25%.
Manufacturability7
A182 F1 N+T's machinability is good (58/100, better than 75% of steel grades); weldability good (65/100); formability good (55/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with A182 F1 N+T
Is A182 F1 easy to machine?
Machines like a medium-carbon steel at ~60% of 1212; use rigid setups, sharp carbide inserts and adequate coolant to avoid built-up edge on the softer annealed condition.
Can A182 F1 be welded?
Readily welded with matched E/ER 80S-D2 or E7018-A1 consumables; preheat 100–200 °C and PWHT at 620–700 °C are normally required for pressure service.
Can A182 F1 be formed, bent or molded?
Primarily hot-forged at 1100–1230 °C with finish above ~900 °C; cold forming is limited by moderate ductility and strain-aging sensitivity.
What surface finishes work on A182 F1?
No anodizing; protect with shop primer, epoxy paint, hot-dip galvanizing, metallizing or electroless nickel — plain surfaces rust rapidly.
A182 F1 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 |
|---|---|---|
| C0.28 max | ≤ 0.28 | 0.22 |
| Mn | 0.6 – 0.9 | 0.75 |
| Si | 0.15 – 0.35 | 0.25 |
| Mocarbon-molybdenum strengthening | 0.44 – 0.65 | 0.52 |
| P0.045 max | ≤ 0.05 | 0.02 |
| S0.045 max | ≤ 0.05 | 0.02 |
| Fe | balance | — |
A182 F1 N+T — frequently asked
What is A182 F1 N+T used for?
A182 F1 N+T is typically used for flanges, fittings, valve bodies and piping components for power plants. In short: entry-level C-Mo pressure forging; better creep than carbon steel; preheat and PWHT required.
What is the yield strength of A182 F1 N+T?
A182 F1 N+T has a typical yield strength of 330 MPa (47.9 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 78% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is A182 F1 N+T easy to machine?
Reasonably — machinability is rated good (58/100, better than 75% of steel grades). Machines like a medium-carbon steel at ~60% of 1212; use rigid setups, sharp carbide inserts and adequate coolant to avoid built-up edge on the softer annealed condition.
Can A182 F1 N+T be welded?
Yes — weldability is rated good (65/100). Readily welded with matched E/ER 80S-D2 or E7018-A1 consumables; preheat 100–200 °C and PWHT at 620–700 °C are normally required for pressure service.
What surface finishes work on A182 F1 N+T?
No anodizing; protect with shop primer, epoxy paint, hot-dip galvanizing, metallizing or electroless nickel — plain surfaces rust rapidly.
Can A182 F1 N+T be formed, bent or molded?
Primarily hot-forged at 1100–1230 °C with finish above ~900 °C; cold forming is limited by moderate ductility and strain-aging sensitivity.
What is the maximum service temperature of A182 F1 N+T?
A182 F1 N+T 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 A182 F1 N+T and A182 F1-A?
N+T is the default condition — standard supply condition for F1 flanges and fittings; best combination of strength, toughness and elevated-temperature stability. A: choose when maximum softness, machinability and dimensional stability are wanted; lowest strength within the spec minimums. Yield strength is 330 MPa in N+T versus 300 MPa in A.
Sources
- ASTM A182/A182M — Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Fittings, Valves and Parts for High-Temperature Service — ASTM International (2023)
- ASTM A335/A335M — Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service (Grade P1) — ASTM International (2022)
- ASME BPVC Section II Part D — Properties (Metric) — ASME (2023)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- API RP 941 — Steels for Hydrogen Service / graphitization guidance — API (2016)
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.