ASTM A182
Grade F12
Forged Flanges & Fittings
Grade F12 vs F11 vs F22
ASTM A182’s chromium-molybdenum forging grades form a genuine, graduated ladder — Grade F1 starts as plain carbon-molybdenum steel with no chromium at all, Grade F12 adds a modest 1% chromium alongside 0.5% molybdenum, Grade F11 steps up to 1.25% chromium and the same 0.5% molybdenum, and Grade F22 reaches 2.25% chromium with a full 1% molybdenum. Each step genuinely buys more oxidation resistance and creep strength at correspondingly higher material cost.
Grade F12 occupies a real, if narrower, niche within that ladder — projects that have determined plain carbon-molybdenum (Grade F1) isn’t quite sufficient for their service temperature, but that don’t need Grade F11’s slightly higher chromium content or F22’s substantially higher chromium and molybdenum, will specify F12 as the appropriately-sized answer rather than over-specifying alloy content the service doesn’t require.
In current practice, Grade F11 is considerably more commonly stocked and specified than Grade F12 — many projects that could technically use either grade default to F11 given its wider availability and more common specification history, but F12 remains a valid, standard-recognized option, particularly where a project’s specific service temperature and material data sheet call for it by name.
Akbar Fasteners Pvt. Ltd. exports to over 50 countries, and our Grade F12 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 F12 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
Correctly-Sized Alloy Content
1% chromium delivers a genuine, appropriate step above carbon-molybdenum Grade F1.
Moderate Creep Strength
Molybdenum content genuinely improves resistance to gradual deformation under sustained load and heat.
Standard-Recognized Grade
A legitimate, current ASTM A182 designation, though less commonly stocked than Grade F11.
Verified Mechanical Properties
Batch testing confirms genuine chromium and molybdenum content and mechanical properties.
Choosing Between Related Forged Alloy Grades
Grade F1
The base carbon-molybdenum grade, no chromium content — the starting point below Grade F12.
View Grade F1 →Grade F12 (This Page)
A modest 1% chromium step above Grade F1, for moderate elevated-temperature service.
You Are HereGrade F22
A substantially richer alloy content, for genuinely higher sustained temperature and hydrogen service.
View Grade F22 →Grade F11 vs Grade F12 — Quick Reference
Confirming whether the project’s material data sheet specifically calls for F12’s slightly leaner chromium content, or whether the more commonly available F11 is an acceptable substitute. This table is the quick reference we use with buyers before quoting.
| Aspect | Grade F12 | Grade F11 |
|---|---|---|
| Chromium Content | ~1.00% | ~1.25% |
| Molybdenum Content | ~0.50% | ~0.50%, identical |
| Market Availability | Less commonly stocked | More widely available |
| Best Suited For | Spec explicitly calls for F12 | General moderate-temperature default |
Grade F12 Specification Details
Nominal Composition
- Chromium 0.80 – 1.25%
- Molybdenum 0.44 – 0.65%
- Carbon ≤0.15%
- UNS Designation K11562
Typical Mechanical Range
- Condition Normalized & Tempered / Annealed
- Service Temperature Moderate Elevated Range
- Creep Strength Improved vs Carbon Steel
- Oxidation Resistance Modest, Genuine Improvement
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 elevated-temperature service genuinely exceeds carbon steel’s range but doesn’t require F11 or F22’s higher alloy content.
Moderate-Temperature Steam Piping
moderate elevated temperature
Refinery Process Piping
refinery process connections
Petrochemical Process Units
reactor and piping flanges
General Elevated-Temperature Piping
where F1 is insufficient
Standard Export Documentation
Prepared as standard practice for every Grade F12 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 F12 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 F22
Our substantially richer 2.25Cr-1Mo alternative, for higher sustained temperature service.
View Grade F22 →ASTM A182 Grade F11
Our more widely available, slightly higher-chromium alternative for the same service range.
View Grade F11 →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-Temperature
Flanges & Fittings?
Tell us your service temperature and pressure class — we’ll confirm whether Grade F12 fits, or whether Grade F11 or F22 is the better match, 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