ASTM A182
Grade F11
Forged Flanges & Fittings
Why Grade F11 Is the Practical Default
Grade F11 sits in the same chromium-molybdenum forging family as Grade F12 and Grade F22 — 1.25% chromium and 0.5% molybdenum, a genuine, meaningful step up from plain carbon or carbon-molybdenum steel, without reaching Grade F22’s substantially richer 2.25% chromium content. That specific balance point has made it, in practice, one of the most commonly stocked and specified alloy steel forging grades across the industry.
Chromium and molybdenum together deliver the same two genuine benefits found across this whole grade family — chromium contributes real oxidation resistance at elevated temperature, while molybdenum genuinely improves creep strength, helping the forging resist gradual, permanent deformation under sustained load and heat. At F11’s alloy level, that’s typically sufficient for moderate-to-elevated temperature service without needing F22’s higher hydrogen-attack resistance or higher-temperature creep performance.
Grade F11’s wide availability is itself a genuine practical advantage — projects that could technically specify the slightly leaner Grade F12 often default to F11 given its broader stocking and more established supply chain, making it frequently the more cost-effective and faster-to-source choice even when either grade would technically satisfy the service requirement.
Akbar Fasteners Pvt. Ltd. exports to over 50 countries, and our Grade F11 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 matching stud bolts to pair with F11 flanges, our carbon and alloy steel ASTM A193/A194 grades are the relevant fastener specifications — please let us know if you’d like both quoted together.
Where This Grade Genuinely Applies
Genuine Oxidation Resistance
1.25% chromium content delivers real, established oxidation resistance at elevated temperature.
Genuine Creep Strength
Molybdenum content improves resistance to gradual deformation under sustained heat and load.
Widely Stocked & Available
One of the most commonly specified alloy steel forging grades, with broad supply chain availability.
Verified Mechanical Properties
Batch testing confirms genuine chromium and molybdenum content and mechanical properties.
Choosing Between Related Forged Alloy Grades
Grade F12
A marginally lower chromium content, less commonly stocked, for spec-driven requirements.
View Grade F12 →Grade F11 (This Page)
The widely-stocked, industry-standard choice for moderate-to-elevated temperature forged components.
You Are HereGrade F22
A substantially richer alloy content, for genuinely higher sustained temperature and hydrogen service.
View Grade F22 →Grade F11 vs Grade F22 — Quick Reference
Confirming whether the joint’s operating temperature and hydrogen exposure genuinely require F22’s richer alloy content before paying for the higher grade. This table is the quick reference we use with buyers before quoting.
| Aspect | Grade F11 | Grade F22 |
|---|---|---|
| Chromium Content | ~1.25% | ~2.25% |
| Molybdenum Content | ~0.50% | ~1.00% |
| Hydrogen Attack Resistance | Moderate | Genuinely higher |
| Best Suited For | Moderate-to-elevated temperature | Sustained high-temperature, hydrogen service |
Grade F11 Specification Details
Nominal Composition
- Chromium 1.00 – 1.50%
- Molybdenum 0.44 – 0.65%
- Carbon ≤0.15%
- UNS Designation K11597
Typical Mechanical Range
- Condition Normalized & Tempered / Annealed
- Service Temperature Moderate to Elevated Range
- Creep Strength Genuinely Improved
- Oxidation 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 moderate-to-elevated temperature service is common, high-volume, well-established industrial demand.
Power Plant Steam Piping
steam piping applications
Refinery Process Piping
refinery process connections
Petrochemical Process Units
reactor and piping flanges
General Elevated-Temperature Piping
elevated-temperature piping
Standard Export Documentation
Prepared as standard practice for every Grade F11 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 F11 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 F12
Our slightly leaner-chromium alternative for a very similar service range.
View Grade F12 →ASTM A182 Grade F22
Our substantially richer 2.25Cr-1Mo alternative, for higher sustained temperature service.
View Grade F22 →ASTM A194 Grade 2 / 2M Nuts
Our standard carbon/alloy steel nut grade, for matching stud bolt fastening at this temperature range.
View Grade 2 / 2M Nuts →Stainless Steel Fasteners Manufacturer India
Our broader fastener manufacturing capability across all major carbon, alloy, and stainless grades.
View SS Manufacturer Guide →Moderate-to-Elevated
Temperature Piping?
Tell us your service temperature and pressure class — we’ll confirm whether Grade F11 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