ASTM A182
Grade F22
Forged Flanges & Fittings
Why Grade F22 for High Temperature
ASTM A182 governs forged and rolled alloy and stainless steel pipe flanges, forged fittings, and valve components — a genuinely different product category from the A194 nuts and A193 stud bolts covered elsewhere on our site, though both exist to serve the same demanding high-temperature, high-pressure piping systems. Grade F22 is one of A182’s most established and widely used grades, defined by its 2.25% chromium, 1% molybdenum composition.
Chromium and molybdenum together deliver two genuine, well-documented benefits at sustained high temperature — chromium contributes to oxidation resistance and to resistance against hydrogen attack (a specific degradation mechanism in high-temperature, high-pressure hydrogen service where hydrogen can react with carbon in the steel and cause decarburization and cracking), while molybdenum improves creep strength, helping the forging resist gradual, permanent deformation under sustained load and heat.
Grade F22 sits at a well-established position in the alloy steel forging family — richer in alloy content than the leaner F1 and F5 grades, and a common, standard choice specifically where hydrogen attack resistance genuinely matters, such as refinery hydroprocessing units, alongside general high-temperature steam and process piping service.
Akbar Fasteners Pvt. Ltd. exports to over 50 countries, and our Grade F22 flanges and forged fittings are manufactured and verified by chemical composition and mechanical testing under our ISO 9001:2015 quality system.
A Note on Product Scope
ASTM A182 covers forged flanges, fittings, valves, and similar forged pressure-part components — it does not govern nuts or stud bolts, which fall under ASTM A194 and ASTM A193 respectively. If your requirement is for the matching stud bolts to pair with F22 flanges, our high-temperature ASTM A193/A194 chromium-molybdenum grades (such as Grade 7 and Grade 16) are the relevant fastener specifications — please let us know if you’d like both quoted together.
Where This Grade Genuinely Applies
Genuine Hydrogen Attack Resistance
Chromium content resists high-temperature, high-pressure hydrogen-induced decarburization.
Genuine Creep Strength
Molybdenum content improves resistance to gradual deformation under sustained heat and load.
Well-Established, Widely Available
One of the most common alloy steel forging grades, with broad industry stocking and familiarity.
Verified Mechanical Properties
Batch testing confirms genuine chromium and molybdenum content and mechanical properties.
Choosing Between Related Forged Alloy Grades
Grade F5
5% chromium, 0.5% molybdenum — a different balance point, suited to somewhat different service conditions.
View Grade F5 →Grade F22 (This Page)
2.25% chromium, 1% molybdenum — the well-established standard for sustained high-temperature service.
You Are HereGrade F11
1.25% chromium, 0.5% molybdenum — a leaner alloy content option for moderately elevated temperature service.
View Grade F11 →Grade F22 Specification Details
Nominal Composition
- Chromium 2.00 – 2.50%
- Molybdenum 0.87 – 1.13%
- Carbon ≤0.15%
- UNS Designation K21590
Typical Mechanical Range
- Condition Normalized & Tempered / Q&T
- Service Temperature Sustained High Temperature
- Creep Strength Genuinely Improved
- Hydrogen Attack Resistance Genuinely Improved
Forged Components We Manufacture
- Flanges Weld Neck, Slip-On, Blind, Socket
- Forged Fittings Elbows, Tees, Reducers
- Valve Bodies Forged Components
- Custom Forgings On Request
Application Areas
Wherever sustained high-temperature service, and often hydrogen exposure, genuinely require chromium-molybdenum forged components.
Refinery Hydroprocessing Units
pressure hydrogen service
Power Plant Steam Piping
steam and process piping
Petrochemical Process Units
and process piping flanges
Fired Heater & Furnace Piping
outlet piping connections
Standard Export Documentation
Prepared as standard practice for every Grade F22 flange or forged fitting shipment.
Mill Test Certificate (MTC)
Heat number, chemical composition, and mechanical property verification for every lot.
Chemical Composition Report
Confirms actual chromium and molybdenum content fall within the specified Grade F22 range.
Certificate of Conformance
Confirms the shipment matches the purchase order grade/size specification in full.
Certificate of Origin (COO)
Confirms India as country of manufacture for destination customs purposes.
NABL Accredited Test Reports
Independent mechanical, dimensional, and NDT testing available on request.
Commercial Invoice & Packing List
Itemized value, Incoterm, and detailed carton/weight breakdown for customs clearance.
Internationally Recognised Standards Coverage
Related Grades & Materials
ASTM A182 Grade F11
Our lower-chromium alternative, for moderately elevated temperature service.
View Grade F11 →ASTM A194 Grade 16 Nuts
Our chromium-molybdenum-vanadium high-temperature nut grade, for the matching stud bolt fastening.
View Grade 16 Nuts →ASTM A194 Grade 7 Nuts
Our standard chromium-molybdenum nut grade, matched to ASTM A193 Grade B7 studs.
View Grade 7 Nuts →Stainless Steel Fasteners Manufacturer India
Our broader fastener manufacturing capability across all major carbon, alloy, and stainless grades.
View SS Manufacturer Guide →High-Temperature
Flanges & Fittings?
Tell us your service temperature, pressure class, and whether hydrogen exposure is a factor — we’ll confirm whether Grade F22 fits and quote with full documentation. Akbar Fasteners Pvt. Ltd. responds within 24 hours.
Sales: +91 724 0000 733 · Support: +91 800 9315 333 · sales@akbarfasteners.in