Steel A182 F12 Cl.2
ASTM A182 F12 Cl.2 · UNS K11564
ASTM A182 F12 Cl.2 is the higher-strength class of the 1Cr-0.5Mo forging steel (UNS K11564), same chemistry as Cl.1 and A335 P12 but with tighter mechanical requirements: 335 MPa yield, 545 MPa tensile, 26 % elongation and about 175 HB in the normalized-and-tempered condition.
Reference datasheet — A182 F12 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 F12 Cl.2 tempers and conditions
A182 F12 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 |
|---|---|---|---|---|---|---|
Annealed | Choose when maximum machinability and dimensional stability of thick forgings matter and Cl.2 strength minima can still be met in the section size. | 300 | 510 | 29 | 155 HB | 8 % IACS |
N+TDefault Normalized and tempered | Standard supply condition for F12 Cl.2 forgings, flanges and fittings; best balance of strength, toughness and creep behaviour. | 335 | 545 | 26 | 175 HB | — |
Quenched and tempered | Used for heavy-wall valve bodies and thick forgings where through-thickness strength and low-temperature toughness must be maximised. | 400 | 585 | 24 | 190 HB | 8 % IACS |
What is A182 F12 Cl.2?
ASTM A182 F12 Cl.2 is the higher-strength class of the 1Cr-0.5Mo forging steel (UNS K11564), same chemistry as Cl.1 and A335 P12 but with tighter mechanical requirements: 335 MPa yield, 545 MPa tensile, 26 % elongation and about 175 HB in the normalized-and-tempered condition. It is used for high-pressure boiler flanges, turbine casings and valve bodies operating to 550 °C. The steel has no natural corrosion resistance, is prone to corrosion under insulation, and requires preheat, interpass control and PWHT. Use Cl.1 where lower strength and easier machining are acceptable. A182 F12 Cl.2 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F). A182 F12 Cl.2 has a yield strength of 335 MPa (48.6 ksi) and a tensile strength of 545 MPa (79 ksi) — weaker than 77% of steel grades. Elongation at break is 26% and the elastic modulus is 207 GPa (30 Msi).
What is A182 F12 Cl.2 used for?
- High-pressure boiler flanges
- Steam turbine casings
- 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
Limitations
- Low strength — 335 MPa (48.6 ksi), worse than 77% of steel grades
A182 F12 Cl.2 properties
Typical room-temperature values for A182 F12 Cl.2-N+T; bars are the position among steel grades.
Physical3
A182 F12 Cl.2 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
A182 F12 Cl.2 has a yield strength of 335 MPa (48.6 ksi) and a tensile strength of 545 MPa (79 ksi) — weaker than 77% of steel grades. Elongation at break is 26% and the elastic modulus is 207 GPa (30 Msi).
Thermal6
A182 F12 Cl.2 is rated for continuous service to 550°C (1,022 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 56% of steel grades. Thermal expansion is 12.2 µm/m·K (6.78 µin/in·°F).
Electrical3
A182 F12 Cl.2 conducts electricity at 8 % IACS, better than 55% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (16/100), better than 79% of steel grades.
Sustainability4
Producing a kilogram of A182 F12 Cl.2 takes about 30 MJ of energy and emits 2.2 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 30%.
Manufacturability7
A182 F12 Cl.2's machinability is good (55/100, better than 62% of steel grades); weldability good (62/100); formability fair (50/100).
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 F12 Cl.2 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with A182 F12 Cl.2
Is A182 F12 Cl.2 easy to machine?
Machines like annealed 4130-class Cr-Mo steel (~60 % of AISI 1212); use rigid setups, carbide tooling and moderate speeds — normalized-and-tempered stock produces tough, stringy chips.
Can A182 F12 Cl.2 be welded?
Weld with matching E8018-B2/ER80S-B2 consumables, 150–250 °C preheat and interpass control, plus PWHT at 675–730 °C to avoid hard HAZ and hydrogen cracking.
Can A182 F12 Cl.2 be formed, bent or molded?
Hot forge at 1050–1200 °C and finish above 900 °C, then normalize-and-temper; cold forming is limited and should be followed by stress relief.
A182 F12 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 |
|---|---|---|
| Chigher than Cl.1 (0.05–0.15) to reach Cl.2 strength | 0.1 – 0.2 | 0.15 |
| Mn | 0.3 – 0.8 | 0.55 |
| P | ≤ 0.04 | — |
| S | ≤ 0.04 | — |
| Si | 0.1 – 0.6 | 0.3 |
| Cr | 0.8 – 1.25 | 1 |
| Mo | 0.44 – 0.65 | 0.52 |
| Fe | balance | — |
What surface finishes work on A182 F12 Cl.2?
No natural corrosion resistance — shot blast and apply zinc-rich primer/paint, aluminizing or hot-dip coating for outdoor and insulated-line service (CUI risk).
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 F12 Cl.2 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- K11564
- ASTM
- A335 P12
How much does A182 F12 Cl.2 cost?
A182 F12 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 F12 Cl.2 — frequently asked
What is A182 F12 Cl.2 used for?
A182 F12 Cl.2 is typically used for high-pressure boiler flanges, steam turbine casings and valve bodies. In short: stronger F12 class; normalized-and-tempered 1Cr-0.5Mo; 550 °C pressure service.
What is the yield strength of A182 F12 Cl.2?
A182 F12 Cl.2 has a typical yield strength of 335 MPa (48.6 ksi) and a tensile strength of 545 MPa (79 ksi) — weaker than 77% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is A182 F12 Cl.2 easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Machines like annealed 4130-class Cr-Mo steel (~60 % of AISI 1212); use rigid setups, carbide tooling and moderate speeds — normalized-and-tempered stock produces tough, stringy chips.
Can A182 F12 Cl.2 be welded?
Yes — weldability is rated good (62/100). Weld with matching E8018-B2/ER80S-B2 consumables, 150–250 °C preheat and interpass control, plus PWHT at 675–730 °C to avoid hard HAZ and hydrogen cracking.
What surface finishes work on A182 F12 Cl.2?
No natural corrosion resistance — shot blast and apply zinc-rich primer/paint, aluminizing or hot-dip coating for outdoor and insulated-line service (CUI risk).
Can A182 F12 Cl.2 be formed, bent or molded?
Hot forge at 1050–1200 °C and 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 F12 Cl.2?
A182 F12 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.
What is the difference between A182 F12 Cl.2 N+T and A182 F12 Cl.2-ANN?
N+T is the default condition — standard supply condition for F12 Cl.2 forgings, flanges and fittings; best balance of strength, toughness and creep behaviour. ANN: choose when maximum machinability and dimensional stability of thick forgings matter and Cl.2 strength minima can still be met in the section size. Yield strength is 335 MPa in N+T versus 300 MPa in ANN.
How much does A182 F12 Cl.2 cost?
A182 F12 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 — ASTM International (2023)
- ASTM A335/A335M — Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service (Grade P12) — ASTM International (2023)
- ASME BPVC Section II Part D — Material 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 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.