Steel A182 F11 Cl.2 N+T
Heat-treated state · default condition
ASTM A182 F11 Cl.2 · UNS K11572
N+T = normalized and tempered
Standard supply condition for F11 Cl.2 flanges, valve bodies and fittings; tempering above 621 °C (1150 °F) gives the Class 2 strength band with good creep behaviour.
Values for the N+T condition
Other A182 F11 Cl.2 tempers and conditions
A182 F11 Cl.2 is listed in 3 conditions; see the grade overview at A182 F11 Cl.2.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
N+T + simulated PWHT / stress relieved | Ordered when forgings will see one or more shop/field PWHT cycles; properties are certified after simulated heat treatment, giving slightly softer but stable values. | 320 | 515 | 28 | 152 HB | 7.8 % IACS |
N+TDefaultThis page Normalized and tempered | Standard supply condition for F11 Cl.2 flanges, valve bodies and fittings; tempering above 621 °C (1150 °F) gives the Class 2 strength band with good creep behaviour. | 350 | 550 | 26 | 163 HB | — |
Quenched and tempered | Choose for heavy-section forgings or where higher toughness and mid-thickness uniformity are needed; A182 permits liquid quenching plus tempering ≥621 °C for Cl.2. | 450 | 610 | 23 | 187 HB | — |
What is A182 F11 Cl.2 N+T?
A182 F11 Cl.2 N+T is A182 F11 Cl.2 heat treated to N+T — standard supply condition for F11 Cl.2 flanges, valve bodies and fittings; tempering above 621 °C (1150 °F) gives the Class 2 strength band with good creep behaviour. A182 F11 Cl.2 N+T has a yield strength of 350 MPa (50.8 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 74% of steel grades. Elongation at break is 26% and the elastic modulus is 207 GPa (30 Msi). A182 F11 Cl.2 N+T 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).
Advantages
- High service temperature — 550°C (1,022 °F), better than 95% of steel grades
- Tough — resists crack growth — 130 MPa·√m (118.3 ksi·√in), better than 89% of steel grades
- Ductile — tolerates forming and impact — 26%, better than 82% of steel grades
A182 F11 Cl.2 N+T properties
Typical room-temperature values for A182 F11 Cl.2 N+T; 13 are specific to this condition. Other listed values are A182 F11 Cl.2 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
A182 F11 Cl.2 N+T 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 F11 Cl.2 N+T has a yield strength of 350 MPa (50.8 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 74% of steel grades. Elongation at break is 26% and the elastic modulus is 207 GPa (30 Msi).
Thermal6
A182 F11 Cl.2 N+T is rated for continuous service to 550°C (1,022 °F). It conducts heat at 40 W/m·K (23.1 BTU/hr·ft·°F), worse than 64% of steel grades. Thermal expansion is 12.2 µm/m·K (6.78 µin/in·°F).
Electrical3
A182 F11 Cl.2 N+T conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (20/100), better than 87% of steel grades.
Sustainability4
Producing a kilogram of A182 F11 Cl.2 N+T takes about 30 MJ of energy and emits 2.1 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 30%.
Manufacturability7
A182 F11 Cl.2 N+T's machinability is good (55/100, better than 62% of steel grades); weldability good (55/100); formability fair (45/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with A182 F11 Cl.2 N+T
Is A182 F11 Cl.2 easy to machine?
Machines like normalized 4130/4140 at ~60 % of AISI 1212; use rigid setups, carbide tooling and moderate speeds, and finish-machine after final heat treatment to avoid distortion.
Can A182 F11 Cl.2 be welded?
Weldable with matching E/ER 80S-B2 or E8018-B2 consumables; preheat 150–250 °C, interpass control and PWHT at 700–760 °C are essential to avoid hydrogen cracking and hard HAZ.
Can A182 F11 Cl.2 be formed, bent or molded?
Hot forge at 1050–1200 °C with finish above ~900 °C, then normalize and temper; cold forming is limited and should be followed by stress relief.
What surface finishes work on A182 F11 Cl.2?
No self-protective oxide at ambient conditions — apply shop primer, high-temperature aluminium paint, phosphate, or aluminizing/thermal spray for hot service; not anodizable.
A182 F11 Cl.2 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 – 0.15 | 0.12 |
| Mn | 0.3 – 0.6 | 0.45 |
| Si | 0.5 – 1 | 0.7 |
| Cr | 1 – 1.5 | 1.25 |
| Mo | 0.44 – 0.65 | 0.55 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Fe | balance | — |
A182 F11 Cl.2 N+T — frequently asked
What is A182 F11 Cl.2 N+T used for?
A182 F11 Cl.2 N+T is typically used for high-pressure steam flanges, boiler component forgings and valve bodies. In short: stronger F11 class; normalized-and-tempered Cr-Mo forging; 550 °C creep service.
What is the yield strength of A182 F11 Cl.2 N+T?
A182 F11 Cl.2 N+T has a typical yield strength of 350 MPa (50.8 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 74% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is A182 F11 Cl.2 N+T easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Machines like normalized 4130/4140 at ~60 % of AISI 1212; use rigid setups, carbide tooling and moderate speeds, and finish-machine after final heat treatment to avoid distortion.
Can A182 F11 Cl.2 N+T be welded?
Yes — weldability is rated good (55/100). Weldable with matching E/ER 80S-B2 or E8018-B2 consumables; preheat 150–250 °C, interpass control and PWHT at 700–760 °C are essential to avoid hydrogen cracking and hard HAZ.
What surface finishes work on A182 F11 Cl.2 N+T?
No self-protective oxide at ambient conditions — apply shop primer, high-temperature aluminium paint, phosphate, or aluminizing/thermal spray for hot service; not anodizable.
Can A182 F11 Cl.2 N+T be formed, bent or molded?
Hot forge at 1050–1200 °C with finish above ~900 °C, then normalize and temper; cold forming is limited and should be followed by stress relief.
What is the maximum service temperature of A182 F11 Cl.2 N+T?
A182 F11 Cl.2 N+T is rated for continuous use to about 550°C (1,022 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
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 (P11) — ASTM International (2023)
- ASME BPVC Section II Part D — Materials, Properties (1.25Cr-0.5Mo) — 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 at Elevated Temperatures — 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.