Steel A182 F12 Cl.1
ASTM A182 F12 Cl.1 · UNS K11562
ASTM A182 F12 Cl.1 is a 1Cr-0.5Mo low-alloy forging steel (UNS K11562) matching A335 P12 piping chemistry, supplied annealed or normalized and tempered.
Reference datasheet — A182 F12 Cl.1 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 Annealed condition
A182 F12 Cl.1 tempers and conditions
A182 F12 Cl.1 is supplied in 3 conditions, soft to hard. Annealed 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 |
|---|---|---|---|---|---|---|
Stress relieved | Condition of welded assemblies after mandatory PWHT; hardness of HAZ drops below 225 HV, properties essentially those of the annealed base metal. | 255 | 450 | 30 | 135 HB | 7.8 % IACS |
AnnealedDefault Annealed (A182 F12 Class 1 as-specified condition) | Standard supply condition for F12 Cl.1 flanges and fittings: full or isothermal anneal, lowest hardness (≤156 HBW), best machinability and toughness. | 265 | 460 | 30 | 140 HB | — |
Normalized and tempered | Pick when higher strength and a finer, more uniform structure are wanted (matches A182 F12 Cl.2 / A335 P12 pipe practice) while keeping creep performance. | 320 | 520 | 26 | 170 HB | — |
What is A182 F12 Cl.1?
ASTM A182 F12 Cl.1 is a 1Cr-0.5Mo low-alloy forging steel (UNS K11562) matching A335 P12 piping chemistry, supplied annealed or normalized and tempered. Typical Class 1 properties are 265 MPa yield, 460 MPa tensile, 30 % elongation and about 140 HB, with creep service to 550 °C, which suits boiler and pressure vessel flanges, nozzles and valve bodies. Machinability is about 60, but the steel has no inherent corrosion resistance and needs preheat plus PWHT when welded. F12 Cl.2 or F11 covers higher-strength or slightly higher-alloy requirements. A182 F12 Cl.1 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.1 has a yield strength of 265 MPa (38.4 ksi) and a tensile strength of 460 MPa (66.7 ksi) — weaker than 92% of steel grades. Elongation at break is 30% and the elastic modulus is 207 GPa (30 Msi).
What is A182 F12 Cl.1 used for?
- Boiler flanges
- Pressure vessel nozzles
- Valve bodies
Advantages
- Tough — resists crack growth — 150 MPa·√m (136.5 ksi·√in), better than 96% of steel grades
- High service temperature — 550°C (1,022 °F), better than 95% of steel grades
- Ductile — tolerates forming and impact — 30%, better than 93% of steel grades
Limitations
- Low strength — 265 MPa (38.4 ksi), worse than 92% of steel grades
A182 F12 Cl.1 properties
Typical room-temperature values for A182 F12 Cl.1-Annealed; bars are the position among steel grades.
Physical3
A182 F12 Cl.1 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.1 has a yield strength of 265 MPa (38.4 ksi) and a tensile strength of 460 MPa (66.7 ksi) — weaker than 92% of steel grades. Elongation at break is 30% and the elastic modulus is 207 GPa (30 Msi).
Thermal6
A182 F12 Cl.1 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 µm/m·K (6.67 µin/in·°F).
Electrical3
A182 F12 Cl.1 conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (18/100), better than 83% of steel grades.
Sustainability4
Producing a kilogram of A182 F12 Cl.1 takes about 30 MJ of energy and emits 2.3 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 30%.
Manufacturability8
A182 F12 Cl.1's machinability is good (60/100, better than 83% of steel grades); weldability good (62/100); formability good (60/100).
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.1 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with A182 F12 Cl.1
Is A182 F12 Cl.1 easy to machine?
Machines like annealed 4130-class steel at ~65 % of 1212; use rigid setups, sharp carbide and good coolant to avoid work-hardened skin on threads and flange facings.
Can A182 F12 Cl.1 be welded?
Weldable with matched 1.25Cr-0.5Mo consumables (E8018-B2 / ER80S-B2); preheat 150–250 °C, interpass control and PWHT at ~700–730 °C are required to soften the HAZ and avoid hydrogen cracking.
Can A182 F12 Cl.1 be formed, bent or molded?
Forged hot at 1050–1200 °C with finishing above 900 °C, then annealed or normalized+tempered; cold forming is limited by high yield-to-tensile ratio and springback.
A182 F12 Cl.1 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 |
|---|---|---|
| CClass 1 | 0.05 – 0.15 | 0.11 |
| Mn | 0.3 – 0.61 | 0.45 |
| Si | ≤ 0.5 | 0.25 |
| P | ≤ 0.05 | 0.02 |
| S | ≤ 0.05 | 0.02 |
| Cr | 0.8 – 1.25 | 1 |
| Mo | 0.44 – 0.65 | 0.52 |
| Fe | balance | — |
What surface finishes work on A182 F12 Cl.1?
Not anodizable — protect with shop primer, phosphate, zinc/aluminium metallizing, or insulation-jacketing; polished surfaces oxidize quickly and need oiling.
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.1 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- K11562
- ASTM
- A335 P12
How much does A182 F12 Cl.1 cost?
A182 F12 Cl.1 is a budget-cost steel ($), cheaper than about 90% 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.1 — frequently asked
What is A182 F12 Cl.1 used for?
A182 F12 Cl.1 is typically used for boiler flanges, pressure vessel nozzles and valve bodies. In short: lower-alloy Cr-Mo forging; good machinability for Cr-Mo; creep service to 550 °C.
What is the yield strength of A182 F12 Cl.1?
A182 F12 Cl.1 has a typical yield strength of 265 MPa (38.4 ksi) and a tensile strength of 460 MPa (66.7 ksi) — weaker than 92% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is A182 F12 Cl.1 easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machines like annealed 4130-class steel at ~65 % of 1212; use rigid setups, sharp carbide and good coolant to avoid work-hardened skin on threads and flange facings.
Can A182 F12 Cl.1 be welded?
Yes — weldability is rated good (62/100). Weldable with matched 1.25Cr-0.5Mo consumables (E8018-B2 / ER80S-B2); preheat 150–250 °C, interpass control and PWHT at ~700–730 °C are required to soften the HAZ and avoid hydrogen cracking.
What surface finishes work on A182 F12 Cl.1?
Not anodizable — protect with shop primer, phosphate, zinc/aluminium metallizing, or insulation-jacketing; polished surfaces oxidize quickly and need oiling.
Can A182 F12 Cl.1 be formed, bent or molded?
Forged hot at 1050–1200 °C with finishing above 900 °C, then annealed or normalized+tempered; cold forming is limited by high yield-to-tensile ratio and springback.
What is the maximum service temperature of A182 F12 Cl.1?
A182 F12 Cl.1 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.1 Annealed and A182 F12 Cl.1-SR?
Annealed is the default condition — standard supply condition for F12 Cl.1 flanges and fittings: full or isothermal anneal, lowest hardness (≤156 HBW), best machinability and toughness. SR: condition of welded assemblies after mandatory PWHT; hardness of HAZ drops below 225 HV, properties essentially those of the annealed base metal. Yield strength is 265 MPa in Annealed versus 255 MPa in SR.
How much does A182 F12 Cl.1 cost?
A182 F12 Cl.1 is a budget-cost steel ($), cheaper than about 90% 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 (P12) — 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)
- GB/T 5310 / GB/T 3077 (15CrMo) — SAC (2017)
- API RP 941 — Steels for Hydrogen Service at Elevated Temperatures — API (2016)
- SMM / Mysteel (2025)
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.