ASTM A182 F22 Alloy Steel Fittings – A182 Gr F22 (2¼Cr-1Mo) Forged Fittings
ASC LLP, Mumbai, supplies ASTM A182 F22 alloy steel fittings: forged socket-weld and threaded fittings to ASME B16.11 in Class 3000, 6000 and 9000, together with branch outlets. In addition, every fitting carries an EN 10204 3.1 certificate. This page therefore covers the A182 F22 material in full, including chemistry, Class 1 and Class 3 properties, heat treatment, equivalents and the matching pipe, flange and buttweld grades.
What is ASTM A182 F22 Material?
ASTM A182 (ASME SA182) is the specification for forged or rolled alloy and stainless steel pipe flanges, forged fittings, valves and parts for high-temperature service. Within it, Grade F22 is a 2¼% chromium – 1% molybdenum steel (UNS K21590). As a result, F22 keeps its strength and creep resistance at high temperature, and it also resists hydrogen attack in refinery service. However, F22 is not a corrosion-resistant steel like stainless steel.
F22 is ordered in two strength classes. Class 1 is the lower-strength, annealed or normalised condition, whereas Class 3 is the higher-strength grade that most piping specifications call for. For this reason, always state the class on the order, for example “ASTM A182 F22 Cl.3”.
A182 F22 – Quick Facts
- Specification: ASTM A182 / ASME SA182, Grade F22 (UNS K21590)
- Composition: 2.00–2.50% Cr, 0.87–1.13% Mo
- Class 3 strength: 515 MPa tensile / 310 MPa yield min
- Fittings standard: ASME B16.11 (socket weld and threaded), MSS SP-97 (branch outlets)
- Matching pipe: ASTM A335 P22
- Service: high-temperature steam and hydrogen service, typically up to about 595 °C
ASTM A182 F22 Chemical Composition
| Element | A182 F22 (%) |
| Carbon (C) | 0.05 – 0.15 |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) | 0.040 max |
| Sulphur (S) | 0.040 max |
| Silicon (Si) | 0.50 max |
| Chromium (Cr) | 2.00 – 2.50 |
| Molybdenum (Mo) | 0.87 – 1.13 |
The chemistry is the same for Class 1 and Class 3, so only the heat treatment and the strength differ. In addition, buyers for hydrogen or sour service often add tighter limits, for example on P, S and the J-factor, through the project specification.
A182 F22 Mechanical Properties – Class 1 vs Class 3
| Property | F22 Class 1 | F22 Class 3 |
| Tensile strength, min | 415 MPa (60 ksi) | 515 MPa (75 ksi) |
| Yield strength, min | 205 MPa (30 ksi) | 310 MPa (45 ksi) |
| Elongation in 50 mm, min | 20% | 20% |
| Reduction of area, min | 35% | 30% |
| Hardness | 170 HBW max | 156 – 207 HBW |
Because Class 3 is about 25% stronger than Class 1, it is the usual choice for power and refinery piping. However, A182 has no impact-test requirement for F22, so toughness testing is added only when the order asks for it.
A182 F22 Forged Fittings – ASME B16.11 Classes & Sizes
| Fitting type | Class 2000 | Class 3000 | Class 6000 | Class 9000 |
| Socket-weld fittings | – | NPS ⅛ – 4 (SCH 80) | NPS ⅛ – 2 (SCH 160) | NPS ½ – 2 (XXS) |
| Threaded fittings | NPS ⅛ – 4 (SCH 80) | NPS ⅛ – 4 (SCH 160) | NPS ⅛ – 2 (XXS) | – |
The B16.11 class tells you which pipe schedule the fitting suits. For example, a Class 3000 socket-weld fitting matches SCH 80 pipe, while a Class 6000 fitting matches SCH 160. Therefore, choose the class from the connecting P22 pipe schedule.
A182 F22 Fitting Types We Supply
- Socket-weld fittings: 90° and 45° elbows, tees, crosses, couplings, half couplings, reducers, caps and unions
- Threaded (NPT) fittings: elbows, tees, couplings, caps, as well as hex plugs, bushings and unions
- Nipples: swage nipples and hex nipples, plain, bevelled or threaded ends
- Branch outlets: Weldolet, Sockolet, Threadolet, Elbolet and Nipolet to MSS SP-97
- Bosses and special forgings: also machined to drawing on request
ASTM A182 F22 Fittings Specifications
| Item | Details |
| Specification | ASTM A182 / ASME SA182, Grade F22 Class 1 or Class 3 |
| Fitting standard | ASME B16.11; MSS SP-97 for outlets; also MSS SP-83 for unions |
| Pressure class | 2000, 3000, 6000 and 9000 |
| Size | NPS ⅛ to 4 (by class); outlets up to 24″ run size |
| Ends | Socket weld (SW), threaded NPT; also butt-weld outlets |
| Heat treatment | Class 1: annealed or normalised and tempered; Class 3: normalised and tempered or quenched and tempered |
| Testing | Chemistry, tensile and hardness; in addition, PMI, UT and third-party inspection on request |
| Certificate | EN 10204 3.1; also 3.2 on request |
A182 F22 Equivalent & Matching Grades
| Product | Matching F22 / 2¼Cr-1Mo grade |
| Seamless pipe | ASTM A335 P22 |
| Buttweld fittings | ASTM A234 WP22 |
| Flanges | ASTM A182 F22 flanges |
| Heavy forgings | ASTM A336 F22 |
| Boiler / heat exchanger tubes | ASTM A213 T22 |
| Valve castings | ASTM A217 WC9 |
| EN equivalent | EN 10222-2 11CrMo9-10 (1.7383) |
Because all of these grades share the same 2¼Cr-1Mo chemistry, a P22 line can be built with F22 forged fittings, WP22 buttweld fittings and F22 flanges. However, an “equivalent” grade may still differ in strength class or testing, so check it against your piping specification.
A182 F22 Heat Treatment & Welding
- Class 1: annealed, or normalised and tempered, so it has lower strength and higher ductility.
- Class 3: normalised and tempered, or liquid quenched and tempered, at a tempering temperature of at least 675 °C (1250 °F).
- Welding: F22 is a P-No. 5A material; therefore, it needs preheat (typically 150–200 °C) and post-weld heat treatment, usually around 690–760 °C.
- Filler metal: 2¼Cr-1Mo consumables such as E9018-B3 / ER90S-B3 are normally used.
Applications of ASTM A182 F22 Fittings
| Industry | Typical A182 F22 fitting use |
| Power generation | Main steam, hot reheat and drain lines, as well as boiler headers |
| Refining | Hydrotreater, hydrocracker and reformer piping, because F22 resists hydrogen attack |
| Petrochemical | High-temperature process lines and furnace piping |
| Boilers & HRSG | Instrument, vent and drain connections on Cr-Mo headers |
| Heat exchangers | Nozzle and small-bore connections on Cr-Mo equipment |
F22 is generally used up to about 595 °C. Above that, or where higher creep strength is needed, F91 is used instead. Since F22 is a low-alloy steel, it is not chosen for its corrosion resistance; therefore, wet corrosive service still needs stainless or nickel alloys.
A182 F22 vs F11 vs F91
| Grade | Cr – Mo | Class 3 / typical tensile – yield (MPa) | Typical use |
| A182 F11 | 1¼Cr – ½Mo | 515 – 310 | Steam lines up to about 550 °C |
| A182 F22 | 2¼Cr – 1Mo | 515 – 310 | Steam and hydrogen service up to about 595 °C |
| A182 F91 | 9Cr – 1Mo – V | 585 – 415 | Supercritical power plants, up to about 650 °C |
In short, F22 offers more creep strength and hydrogen resistance than F11, while F91 is chosen for the highest temperatures. See also our F1, F5 and F9 fittings, the A234 WP alloy fittings range and our alloy steel products. For flange bolting, see A193 B7 stud bolts.
Frequently Asked Questions – ASTM A182 F22 Fittings
What is ASTM A182 F22 material?
ASTM A182 F22 is a forged 2¼% chromium – 1% molybdenum alloy steel (UNS K21590) for high-temperature service. It is used for forged fittings, flanges and valve parts in power and refinery piping.
What is the chemical composition of A182 F22?
A182 F22 contains C 0.05–0.15%, Mn 0.30–0.60%, Si 0.50% max, Cr 2.00–2.50% and Mo 0.87–1.13%. In addition, P and S are each limited to 0.040% max.
What is the difference between F22 Class 1 and Class 3?
Both have the same chemistry. However, Class 3 is heat-treated to a higher strength (515 MPa tensile, 310 MPa yield, 156–207 HBW), while Class 1 is lower (415 / 205 MPa, 170 HBW max).
What is the equivalent of ASTM A182 F22?
The UNS number is K21590, and the closest EN grade is 11CrMo9-10 (1.7383) to EN 10222-2. In addition, the matching grades are A335 P22 pipe, A234 WP22 buttweld fittings and A217 WC9 castings.
What is the maximum temperature for F22?
F22 is generally used up to about 595 °C (1100 °F). Above that, F91 is usually chosen instead.
Which pipe is used with A182 F22 fittings?
A182 F22 fittings are normally used with ASTM A335 P22 seamless pipe. Therefore, F22 flanges and WP22 buttweld fittings are used on the same line.
Is A182 F22 corrosion resistant?
No. F22 is a low-alloy Cr-Mo steel, so it is chosen for high-temperature strength and hydrogen resistance rather than corrosion resistance. For corrosive service, stainless or nickel alloys are used instead.
Global Supply
ASC LLP supplies ASTM A182 F22 forged fittings from Mumbai to customers in India, the Middle East, Europe, Africa, the Americas and South-East Asia, together with matching P22 pipe and F22 flanges. To get a prompt quotation, simply send your enquiry with fitting type, size, B16.11 class, F22 class (1 or 3) and quantity.
Countries We Export To
UNITED STATES, EUROPE, UK, UAE, SAUDI ARABIA, OMAN, KUWAIT, JORDAN, QATAR, INDONESIA, MALAYSIA, BRAZIL, SPAIN, ITALY, FRANCE, GERMANY, BAHRAIN, SRI LANKA, AZERBAIJAN, AUSTRALIA, AUSTRIA, PHILIPPINES, TURKEY, RUSSIA, IRAN, IRAQ, CANADA, KOREA, JAPAN, YEMEN, FINLAND, ZIMBABWE, HUNGARY, PORTUGAL, VIETNAM, MOROCCO, THAILAND, SOUTH AFRICA, MEXICO, SINGAPORE, GREECE, KUWAIT, POLAND, NEW ZEALAND, SWEDEN, SWITZERLAND, BELGIUM, BHUTAN, BANGLADESH, TAIWAN, ROMANIA, CAMBODIA, KAZAKHSTAN, AFGHANISTAN.
