ASTM A182 F91 Flanges Quick Overview
Mortec At A Glance
Established
Since 2012 • 15+ yrs experience
Manufacturing Units
2 in-house units • Taloja & Mazgaon
Stockyard Area
8,850+ sq.ft • Ready-stock inventory
Certifications
ISO 9001:2015, PED • GST, IEC & MSME
Clientele
100+ clients • India & export markets
Export Reach
15+ countries • GCC, Africa & APAC
Testing Offered
Tensile, hardness & PMI • MTC EN 10204 3.1
Shipment Documents
Invoice, Packing List • COO, COI, MTC, BL & Lab Report
Table of Content
Top-grade UNS K90901 Plate Flange Manufacturer in India As Per ASME B16.5
We upsetting every blank from heat-numbered 9Cr-1Mo-V billet inside own Mumbai forge. Every blank is saw-cut from heat-numbered modified 9Cr-1Mo-V billet before forging. Grade F91 uses vanadium and niobium to stabilize the microstructure effectively. This stabilization protects against creep during demanding high-temperature service conditions. Proper normalising and tempering cycles remain essential for consistent performance.
We treat every flange inside our own controlled furnace. Treatment charts remain attached to each heat file for complete traceability. This avoids relying on external job-work treatment documentation completely. Machining follows ASME B16.5 from 1/2" through 24" sizes. ASME B16.47 Series A, B or MSS SP-44 applies above. Options include RTJ, RF and FF faces with custom drilling. Both Type 1 and Type 2 materials remain available with Classes 150 through 2500 for immediate requirements. Stocked references clear our works within three to five working days. PMI reports and EN 10204 3.1 or 3.2 certificates complete each document pack.
ASTM A182 F91 Flanges Specification
Ordered from the forging floor itself, so the original certificate pack is handed over with the crate instead of being re-typed by a trader.
SA182 Grade F91 Forged Flanges Dimensional Standards
- ASME B16.5 • ASME B16.47 Series A & B
- MSS SP-44 large diameter
- ASME B16.36 orifice • B16.48 line blanks
A182 F91 RTJ Flanges Design Code Reference
- ASME B31.1 power piping references
- ASME B31.3 process piping references
- Section IX P-No. 15E Group 1 weld group
UNS K90901 Blind Flange Quality Systems Held
- ISO 9001:2015 certified works
- PED 2014/68/EU file issued when the order calls for it
ASME SA 182 F91 Spectacle Blind Flanges Third-Party Inspection
- SGS, BV, TUV, Lloyd’s Register, IRS
- Your own inspector can sit in on release
A182 Gr F91 Orifice Flange Heat Treatment Records
- Furnace chart issued against the batch
- Post-temper hardness logged per piece
ASTM A182 Grade F91 Slip On Flange Matching Grade 91 Family
- ASTM A335 P91 pipe • A234 WP91 fittings
- ASTM A213 T91 tube • A387 Gr 91 plate
WNR 1.4903 Lapped Joint Flange Raw Material Control
- Every bar carries its parent heat number
- Check analysis on the finished piece if asked
UNS K90901 Plate Flange Order Flexibility
- One-off spares through to full container lots
- Special bores and non-standard hole patterns
ASTM A182 F91 Flanges Manufacturer In Mumbai - Forging Since 2012
Name the NPS, class and facing and we hold those pieces against today’s rack.
ASTM A182 F91 Flange Size Chart
As an ASTM A182 F91 Flanges Manufacturer In India we supplies a complete size range with precise dimensions .
Alloy Steel F91 Weld Neck Flange Size Coverage
Settle The Bore Before The Size
A weld neck bored for one schedule will never line up against another, and on a creep-service header that mismatch shows up as a stress raiser rather than a fit-up nuisance. Post the drawing or line schedule across and we mark up bore, hub and facing against the class you have picked, then come back the same working day with a rate ex our Mumbai works.
Check Size AvailabilitySA 182 F91 Blind Flange Dimensions
Grade F91 changes the metallurgy, never the envelope - the flange still measures to ASME B16.5 or B16.47 for its size and class.
| Normal Pipe Size (NPS) | Outside Daimeter (O.D.) Of Flange | Thickness Of Flanges | Hub at Base Diameter | Diameter of Raised Face |
|---|---|---|---|---|
| O | Q | X | R | |
| 1/2 | 3-1/2 | 7/16 | 1-3/16 | 1-3/8 |
| 3/4 | 3-7/8 | 1/2 | 1-1/2 | 1-11/16 |
| 1 | 4-1/4 | 9/16 | 1-15/16 | 2 |
| 1-1/4 | 4-5/8 | 5/8 | 2-5/16 | 2-1/2 |
| 1-1/2 | 5 | 11/16 | 2-9/16 | 2-7/8 |
| 2-1/2 | 7 | 7/8 | 3-9/16 | 4-1/8 |
| 2 | 6 | 3/4 | 3-1/16 | 3-5/8 |
| 3-1/2 | 8-1/2 | 15/16 | 4-13/16 | 5-1/2 |
| 3 | 7-1/2 | 15/16 | 4-1/4 | 5 |
| 4 | 9 | 15/16 | 5-5/16 | 6-3/16 |
| 5 | 10 | 15/16 | 6-7/16 | 7.5/16 |
| 6 | 11 | 1 | 7-9/16 | 8-1/2 |
| 8 | 13-1/2 | 1-1/8 | 9-11/16 | 10-5/8 |
| 10 | 16 | 1-3/16 | 12 | 12-3/4 |
| 12 | 19 | 1-1/4 | 14-3/8 | 15 |
| 14 | 21 | 1-3/8 | 15-3/4 | 16-1/4 |
| 16 | 23-1/2 | 1-7/16 | 18 | 18-1/2 |
| 18 | 25 | 1-9/16 | 19-7/8 | 21 |
| 20 | 27-1/2 | 1-11/16 | 22 | 23 |
| 24 | 32 | 1-7/8 | 26-1/8 | 27-1/4 |
SA 182 F91 BLRF Flanges Data Sheets
Every pattern and class carries its own hub profile, bore, overall length and face height, so rather than crowd them onto one page we send the full sheet as PDF or Excel for the exact class and facing you call out, lifted from whichever of ASME B16.5 or B16.47 governs that size.
Request Dimension ChartTolerance & Drilling Notes
Mill-certified Alloy Steel F91 Weld Neck and Blind Flange in Type 1/2 With RTJ, RF, & FF Faces
Various Types Of Alloy Steel F91 Flanges
Ten patterns forged and finished in-house, each either racked or slotted into the running batch against live project demand.
Alloy Steel F91 Weld Neck Flange
ASME B16.5 • ½″-24″- ASTM A182 Alloy Steel F91 Weld Neck Flanges
- UNS K90901 Weld Neck Flanges
UNS K90901 Blind Flange
ASME B16.5 • All Classes- ASME SA182 Alloy Steel F91 BLRF Flange
- Chrome Moly F91 Blind Flange
ASTM A182 Grade F91 Slip On Flange
ASME B16.5 • Class 150-600- ASTM A182 Alloy Steel F91 Slip on Flange
- SA182 Alloy Steel F91 SORF Flange
ASME SA182 F91 Socket Weld Flange
ASME B16.5 • ≤4″ NB- Alloy Steel F91 SWRF Flange
- 1.4903 Socket weld Flange
Alloy Steel F91 Threaded Flange
NPT • BSPT • BSPP- UNS K90901 Threaded Flange
- Chrome Moly F91 Threaded Flange
F91 Alloy Steel Lap Joint Flange
ASME B16.5 • With Stub End- ASTM A182 F91 Lap Joint Flange
- Alloy Steel F91 LJ Flanges
A182 Gr F91 Orifice Flange
ASME B16.36 • Class 300+- Chrome Moly F91 Orifice Flange
- ASTM A182 Alloy Steel F91 Orifice Flange
ASME SA 182 F91 Spectacle Blind Flanges
ASME B16.48 • Figure-8 Plate- Alloy Steel F91 Spectacle Blind Flange
- CrMo F91 Spectacle Blind Flange
UNS K90901 Plate Flange
Flat Face • Low Pressure- ASME SA182 Alloy Steel F91 Plate Flange
- UNS K90901 Plate Flanges
A182 Gr F91 Reducing Flange
ASME B16.5 • Two Bore Sizes- UNS K90901 Reducing Flanges
- ASME SA182 Alloy Steel F91 Reducing Flanges
ASTM A182 Gr F91 Flange Equivalent
Grade F91 is the forged version of modified 9Cr-1Mo-V, sharing the same chemistry across all piping standards.
ASTM / ASME (USA)
- ASTM A182 F91 - UNS K90901
- ASME SA182 Grade F91
- Type 1 and Type 2 per the current edition
DIN / EN (Germany)
- Werkstoff 1.4903
- X10CrMoVNb9-1
Same Chemistry, Other Product Forms
- ASTM A335 P91 - seamless pipe
- ASTM A234 WP91 - butt weld fittings
- ASTM A213 T91 - boiler tube
- ASTM A387 Grade 91 - pressure vessel plate
- ASTM A217 C12A - castings
Trade & Shop Names
- Grade 91 / Gr 91
- P91 and T91 in pipe and tube form
- Modified 9Cr-1Mo
- Creep strength enhanced ferritic (CSEF)
Weld & Code Grouping
- ASME Section IX P-No. 15E, Group 1
- Grouped apart from F9, F22 and F5
- Never cross-substituted on a data book
Other National Standards
- JIS, BS and GOST cross-references
- Put in writing before anything is forged
- Ask at enquiry stage and it comes back with the offer
A182 F91 Chemical Composition
SA 182 F91 BLRF Flanges Mechanical Properties
What ASTM A182 asks a normalised and tempered Grade F91 forging to meet when tested at ambient temperature.
UNS K90901 Blind Flange Hardness, PWHT & Type IV Cracking Control
These are the five checks that decide whether a flange survives its design life.
What Goes Wrong In The Field
- Over-Tempering: a soft zone that creeps early under load
- Incomplete Transformation: tempering started before the piece cooled out
- Type IV Cracking: failure in the fine-grained band of the weld heat affected zone
- Wrong Grade Fitted: plain F9 or F22 passed off against an F91 line list
How We Close It Out
- Hardness: Brinell taken after temper on every piece, not per heat
- Acceptance: readings held inside the ASTM A182 ceiling of 248 HBW
- Charts: furnace trace issued with the batch, temperature and soak visible
- PMI: spectro confirms V, Nb and Cr before the piece is stamped F91
A182 Gr F91 Orifice Flange Creep & Design Temperature Data
Why power and refinery designers choose CSEF flanges over F22—and what design offices must still verify themselves.
Alloy Steel F91 Weld Neck Flange Exporter In India To Jubail & Dammam
Saudi-bound crates are marked, listed and papered before the booking closes.
ASME SA 182 F91 Spectacle Blind Flanges Documents & Country Approvals
We agree on destination port files at order stage so nothing delays the container.
South Africa
- SANS-referenced spec matching on request
- Heat-wise certificate set filed per crate
- Routed through Durban or Richards Bay
United Arab Emirates
- Origin certificate attested at the chamber
- Vendor data books built to EPC format
- Jebel Ali and Khalifa Port delivery
Kenya
- PVoC handled through the appointed agency
- Certificate of Conformity raised pre-shipment
- Mombasa discharge and inland haulage
Canada
- CRN paperwork backed with material and drawing data
- We answer queries from the provincial authority
- Dimension sheets issued in both unit systems
Alloy Steel F91 Threaded Flange Applications
Speak to a leading ASTM A182 F91 Flanges Exporter to pin the exact pattern and class your circuit calls for.
ASTM A182 Grade F91 Slip On Flange Gasket Size Chart
| Normal Pipe Size | Gasket I.D. (Inside Daimeter) |
Gasket O.D. (Outside Daimeter) | ||||
|---|---|---|---|---|---|---|
| 150 LB | 300 LB | 400 LB | 600 LB | 900 LB | ||
| 1 | 1.31 | 2.625 | 2.875 | 2.875 | 2.875 | 3.125 |
| 1 1/2 | 1.91 | 3.375 | 3.75 | 3.75 | 3.75 | 3.875 |
| 1/2 | 0.84 | 1.875 | 2.125 | 2.125 | 2.125 | 2.50 |
| 3/4 | 1.06 | 2.25 | 2.625 | 2.625 | 2.625 | 2.75 |
| 1 1/4 | 1.66 | 3 | 3.25 | 3.25 | 3.25 | 3.50 |
| 2 1/2 | 2.88 | 4.875 | 5.125 | 5.125 | 5.125 | 6.50 |
| 2 | 2.38 | 4.125 | 4.375 | 4.375 | 4.375 | 5.625 |
| 3 | 3.50 | 5.375 | 5.875 | 5.875 | 5.875 | 6.625 |
| 4 | 4.50 | 6.875 | 7.125 | 7.00 | 7.625 | 8.125 |
| 5 | 5.56 | 7.75 | 8.50 | 8.375 | 9.50 | 9.75 |
| 6 | 6.62 | 8.75 | 9.875 | 9.75 | 10.50 | 11.375 |
| 8 | 8.62 | 11 | 12.125 | 12.00 | 12.625 | 14.125 |
| 10 | 10.75 | 13.375 | 14.25 | 14.125 | 15.75 | 17.125 |
| 12 | 12.75 | 16.125 | 16.625 | 16.50 | 18.00 | 19.625 |
WNR 1.4903 Lapped Joint Flange Machining Process
Eight fixed stages on the route card, and the parent heat number is carried across at every single one.
A182 F91 RTJ Flanges Gasket & Bolting Pairing
On a hot creep-service joint, the gasket and studs matter as much as the flange—here is how the faces are matched.
Ring Type Joint (RTJ)
- Gasket: ASME B16.20 rings, octagonal or oval section
- Face Prep: Groove turned, then proved with a profile gauge
- Typical Use: Class 600 upward on steam and hot process duty
- Advantage: Metal seal that pulls tighter as pressure rises
Raised Face (RF) Joint
- Gasket: ASME B16.20 spiral wound, filler chosen for the duty
- Face Prep: Serrations that bite and stop the winding creeping
- Typical Use: Class 150 through 600 process connections
- Advantage: Simpler to break and re-make during a turnaround
A182 Gr F91 Reducing Flange Surface Finish
Reach a leading ASTM A182 F91 Flanges Supplier in India for faces cut to the finish your gasket schedule actually calls for.
ASME B16.5 Grade F91 Flange Supplier In Chennai
Compliance papers leave with the lorry, not two weeks behind it.
SA 182 F91 BLRF Flanges Testing Methods
The checks that run on every batch as standard, alongside the extras buyers bolt on for project orders.
F91 Alloy Steel Lap Joint Flange Welding Precautions
Grade 91 is air-hardening - joint has to be preheated, cooled out properly and heat-treated.
ASTM A182 F91 Flange Delivery Estimate
Rough movement windows once the size, class and quantity are matched against the live rack position.
Ex-Stock Dispatch
- Racked references leave the gate within 3-5 working days
Sea Freight
- Slotted onto the next Nhava Sheva sailing after crating
Air Freight
- Outage spares wheels-up 3-6 days from release
Country-Specific ETA
- Port-wise arrival window confirmed with your proforma
ASTM A182 Grade F91 Slip On Flange Stocked & Dispatched Worldwide
Racked material and fresh forging batches both move out to buyers in the markets below.
UAE
TurkeyCanada
UK
Saudi Arabia
SingaporeUSA
Mexico
Thailand
Italy
NetherlandsGermany
Philippines
Malaysia
Uganda
IndonesiaSouth AfricaKenya
Vietnam
VenezuelaASTM A182 F91 Flanges FAQs
The questions our desk fields most often before a Grade 91 order is released.
What are ASTM A182 F91 Blind Flange dimensions governed by?
Outside diameter and thickness follow ASME B16.5 up to 24″ and ASME B16.47 Series A and B or MSS SP-44 from 26″ upward.
What sizes are available in ASTM A182 F91 Plate Flanges?
1/2" to 24" NB to ASME B16.5 and 26″ to 60″ NB to ASME B16.47 Series MSS SP-44.
What is the price of ASTM A182 F91 flanges?
Price is quoted per piece by NPS, class, facing and quantity, as forging weight drives cost more than grade alone.
What is the difference between ASME SA182 F91 Type 1 and Type 2?
Both are UNS K90901 9Cr-1Mo-V forgings, with the latest ASTM A182 edition adding tighter residual and trace-element controls.
Can you ship ASTM A182 F91 Weld Neck Flanges into South Africa, the UAE, Kenya and Canada?
Yes - consignments include heat-wise EN 10204 3.1/3.2 certificates, attested COO, and Kenya PVoC handling.
Authorized Supplier For The Following Companies - Material At Reseller Price For Traders
