Steel A182 F11 Cl.2
ASTM A182 F11 Cl.2 · UNS K11572
ASTM A182 F11 Cl.2 is the higher-strength class of the 1.25Cr-0.5Mo creep-resisting forging steel (UNS K11572), same chemistry as Cl.1 and A335 P11 but supplied normalized and tempered to 350 MPa yield, 550 MPa tensile, 26 % elongation and about 163 HB.
Reference datasheet — A182 F11 Cl.2 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 N+T condition
A182 F11 Cl.2 tempers and conditions
A182 F11 Cl.2 is supplied in 3 conditions, soft to hard. N+T is the default FabDigit quotes; the values on this page are for it.
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+TDefault 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?
ASTM A182 F11 Cl.2 is the higher-strength class of the 1.25Cr-0.5Mo creep-resisting forging steel (UNS K11572), same chemistry as Cl.1 and A335 P11 but supplied normalized and tempered to 350 MPa yield, 550 MPa tensile, 26 % elongation and about 163 HB. It is used for higher-stress high-temperature forgings such as steam flanges, boiler components and valve bodies up to 550 °C. Machinability drops to about 55, and welding demands preheat, interpass control and PWHT. Choose Cl.1 where lower strength and easier machining are acceptable. A182 F11 Cl.2 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). A182 F11 Cl.2 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).
What is A182 F11 Cl.2 used for?
- High-pressure steam flanges
- Boiler component forgings
- Valve bodies
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 properties
Typical room-temperature values for A182 F11 Cl.2-N+T; bars are the position among steel grades.
Physical3
A182 F11 Cl.2 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 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 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 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 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'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. 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. A182 F11 Cl.2 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with A182 F11 Cl.2
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.
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 | — |
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.
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 A182 F11 Cl.2 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- K11572
- ASTM
- A335 P11
How much does A182 F11 Cl.2 cost?
A182 F11 Cl.2 is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
A182 F11 Cl.2 — frequently asked
What is A182 F11 Cl.2 used for?
A182 F11 Cl.2 is typically used for high-pressure steam flanges, boiler component forgings and valve bodies. In short: stronger F11 class; normalized-and-tempered Cr-Mo forging; 550 °C creep service.
What is the yield strength of A182 F11 Cl.2?
A182 F11 Cl.2 has a typical yield strength of 350 MPa (50.8 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 74% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is A182 F11 Cl.2 easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Machines like normalized 4130/4140 at ~60 % of AISI 1212; use rigid setups, carbide tooling and moderate speeds, and finish-machine after final heat treatment to avoid distortion.
Can A182 F11 Cl.2 be welded?
Yes — weldability is rated good (55/100). Weldable with matching E/ER 80S-B2 or E8018-B2 consumables; preheat 150–250 °C, interpass control and PWHT at 700–760 °C are essential to avoid hydrogen cracking and hard HAZ.
What surface finishes work on A182 F11 Cl.2?
No self-protective oxide at ambient conditions — apply shop primer, high-temperature aluminium paint, phosphate, or aluminizing/thermal spray for hot service; not anodizable.
Can A182 F11 Cl.2 be formed, bent or molded?
Hot forge at 1050–1200 °C with finish above ~900 °C, then normalize and temper; cold forming is limited and should be followed by stress relief.
What is the maximum service temperature of A182 F11 Cl.2?
A182 F11 Cl.2 is rated for continuous use to about 550°C (1,022 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does A182 F11 Cl.2 cost?
A182 F11 Cl.2 is a standard-cost steel ($$), cheaper than about 71% 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 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; 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.