Why Refineries Choose Ganpat Industrial For Alloy Steel Flanges?
F1 To F22 Grades In-House
Chrome Moly Flanges forged and heat-treated under one roof, not traded
Rated To 650°C Service
Creep-resistant heats for refinery, fertiliser & power piping
One PO, Every End Type
WN • SO • Blind • SW • Threaded • LJ • Spectacle • Orifice
PED & NACE Ready
ISO 9001 • PED Certified • NACE MR0175 heats on request
Quote In 24 Hours
Ready billet stock on F11 & F22 – dispatch inside the week
Alloy Steel Flanges Highlights
- 1Types: Weld Neck, Slip On, Blind, Socket Weld, Threaded, Lap Joint, Spectacle Blind, Orifice, Reducing
- 2Size Range: NB 1/2″ to 24″ • ASME B16.47 above 24″
- 3Grades: ASTM A182 F1, F5, F9, F11, F12, F22
- 4Standards: ASME B16.5, B16.47, B16.36, B16.48, MSS SP-44
- 5Pressure Class: 150 to 2500
- 6Face: Raised Face, Flat Face, Ring Type Joint
Ganpat Industrial is a trusted Alloy Steel Flanges Supplier in India. We manufacture ASTM A182 F1, F5, F9, F11 and F22 flanges. Our Chrome Moly Flanges deliver reliable performance at elevated temperatures. We maintain strict quality controls throughout forging and manufacturing processes. Each flange is tested and supplied with complete documentation. We serve refineries, fertiliser plants, and power-EPC buyers globally. Our products are supplied across India, UAE, and Middle East.
Mumbai · Alloy Steel Flanges Manufacturer In India
Reliable Flanges for High-Temperature Service.
Ganpat Industrial is a leading Alloy Steel Flanges Manufacturer In India, supplying ASTM A182 F1, F5, F9, F11 & F22 Chrome Moly Flanges for high-temperature applications.
- ✓Precision Machined Flanges
- ✓MTC Certified
- ✓High-Temperature Resistance
- ✓Petrofac Approved
Get Chromoly Spectacle Blind Flanges Manufacturer in India With High Temperature & Pressure Resistance
Alloy Steel Flanges Specification
We are a reliable Alloy Steel Flanges Supplier In India, offering complete specification details.
ASTM A182 Flanges Material Grades
- ASTM A182 Grade F1
- ASTM A182 Grade F5
- ASTM A182 Grade F9
- ASTM A182 Grade F11 & F22
Alloy Steel Flanges Size Range
- NB 1/2″ – 24″ Per ASME B16.5
- Above 24″ Per ASME B16.47
- Class 150 – 2500
- Custom Sizes On Drawing
IBR Alloy Steel Plate Flange Testing
- PMI Testing
- Hydrostatic Test
- Ultrasonic Test
- Third-Party Inspection
Chromium Alloy Steel Raised Face Flange Facing
- Raised Face (RF)
- Flat Face (FF)
- Chromium Alloy Steel RTJ Flange
- Male-Female / Tongue & Groove
High Temp Alloy Steel Threaded Flange Documentation
- Mill Test Certificate 3.1
- Form III-C
- NABL Lab Report
- Certificate Of Origin
Low Alloy Steel Socket Weld Flange Origin
- Indian Origin
- European Origin
- Heat-Number Traceable
- Batch-Wise MTC
Thickness Chart of Low Alloy Steel Blind Flange
Blind flange thickness by nominal bore and pressure class, per ASME B16.5
| NB (Inch) | Class 150 (mm) | Class 300 (mm) | Class 600 (mm) |
|---|---|---|---|
| 1/2 | 14.3 | 17.5 | 23.9 |
| 2 | 19.1 | 22.3 | 31.8 |
| 3 | 23.9 | 28.6 | 38.2 |
| 4 | 23.9 | 31.8 | 44.5 |
| 6 | 25.5 | 36.6 | 54.3 |
| 16 | 36.6 | 57.2 | 82.6 |
| 24 | 47.7 | 69.9 | 108.0 |
Alloy Steel Lap Joint Flange HSN Code
HSN Code
7307.91.00
Flanges, Iron/Steel, Other Than Stainless
GST Rate
18%
Applicable On Domestic Sale
Basic Customs Duty
≈ 7.5%
Indicative – verify current tariff on import
Export Benefit
RoDTEP Eligible
Duty drawback available on export orders
Features of Ferritic Alloy Steel Forged Flange
High Creep-Rupture Strength
Hydrogen Attack (HTHA) Resistance
Excellent Weldability
Chromium Alloy Steel Socket Weld Flange Option
Low Alloy Steel Blind Flange Option
Alloy Steel Reducing Flange On Drawing
Dimensional Stability At Temperature
Oxidation & Scaling Resistance
Monthly Delivery of AS Slip On Flange in Below Countries
| Export to | Continent | Shipping time |
|---|---|---|
 Indonesia |
Asia | 9 Days |
 Philippines |
Asia | 14 Days |
 Spain |
Europe | 30 Days |
 Germany |
Europe | 20 Days |
Need F11 Or F22 Flanges Certified To A Project Spec?Share the datasheet – factory price with MTC 3.1 in 24 hours.
Chemical Composition of Chrome Molybdenum Alloy Steel Weld Neck Flange
| Grade | C % | Mn % | Si % | Cr % | Mo % | P % | S % |
|---|---|---|---|---|---|---|---|
| F1 | 0.28 Max | 0.30-0.60 | 0.10-0.50 | 0.30-0.60 | 0.44-0.65 | 0.025 Max | 0.025 Max |
| F5 | 0.15 Max | 0.30-0.60 | 0.50 Max | 4.00-6.00 | 0.44-0.65 | 0.025 Max | 0.025 Max |
| F9 | 0.15 Max | 0.30-0.60 | 0.50 Max | 7.00-9.00 | 0.90-1.10 | 0.025 Max | 0.025 Max |
| F11 | 0.05-0.15 | 0.30-0.60 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 | 0.025 Max | 0.025 Max |
| F22 | 0.05-0.15 | 0.30-0.60 | 0.50 Max | 2.00-2.50 | 0.90-1.10 | 0.025 Max | 0.025 Max |
Chrome Moly Flanges Material Equivalent
American Standard
- ASTM A182 F1 / F5 / F9 / F11 / F22
- ASME SA-182
- ASTM A335 Matching Pipe (P1/P11/P22)
- ASTM A217 Cast Equivalent (WC6/WC9)
European Standard
- Alloy DIN 1.5415 Threaded Flange (16Mo3)
- DIN 1.7335 (13CrMo4-5)
- DIN 1.7380 (10CrMo9-10)
- EN 10222-2
Japanese Standard
- JIS G4109 SCMV2 / SCMV3
- JIS G4109 SCMV4
- JIS G4109 SCMV6
- JIS B2220
Mechanical Properties of Intermediate Alloy Steel WNRF Flange
| Grade | UNS No. | Tensile Min | Yield Min | Elongation Min | Hardness Max | Typical Max Service Temp |
|---|---|---|---|---|---|---|
| F1 (C–0.5Mo) | K12822 | 485 MPa | 275 MPa | 20% | 192 HB | Moderate temperature service |
| F5 (5Cr–0.5Mo) | K41545 | 485 MPa | 275 MPa | 20% | 217 HB | ≈ 650°C |
| F9 (9Cr–1Mo) | K90941 | 585 MPa | 380 MPa | 20% | 217 HB | ≈ 650°C |
| F11 Cl.2 (1.25Cr–0.5Mo) | K11572 | 485 MPa | 275 MPa | 20% | 197 HBW | ≈ 565°C |
| F22 Cl.3 (2.25Cr–1Mo) | K21590 | 515 MPa | 310 MPa | 20% | 235 HBW | ≈ 595°C |
Buying In Bulk For A Refinery Or EPC Project?Send your BOQ – factory price, MTC 3.1, dispatch same week.
Different Types of Alloy Steel Flanges
Alloy Steel Blind Flanges
ASME B16.5
Chromoly Spectacle Blind Flanges
ASME B16.48
Chrome Molybdenum Alloy Steel Weld Neck Flange
ASME B16.5
AS Slip On Flange
ASME B16.5
Alloy Steel Lap Joint Flange
ASME B16.5
IBR Alloy Steel SORF Flange
IBR Approved
Ferritic Alloy Orifice Flange
ASME B16.36
Chromium Alloy Steel RTJ Flange
ASME B16.5
Value Added Services of AS Slip On Flange
IBR Alloy Steel Plate Flange Certification
Indian Boiler Regulation Form III-C for boiler & pressure-part orders
Cert
Custom Machining To Drawing
RF / FF / RTJ facing, bore & bolt-hole modification on request
Machining
Third-Party Inspection
Lloyd’s, Bureau Veritas, SGS & TUV witnessed testing on request
TPI
Heat-Number Traceable Packing
Export-grade wooden crating with anti-rust coating and heat marking
Packing
High Temp Alloy Steel Threaded Flange Heat Treatment Process
Forging & Heat Analysis
Billet verified against ASTM A182 chemistry before forging
Normalizing
Uniform grain refinement across the forged section
Temper Or Quench & Temper
Class-specific cycle to hit target tensile and hardness band
Stress Relieving
Post-machining relief for thick-section F11 & F22 flanges
Hardness & Microstructure Check
Brinell hardness and grain structure confirmed per heat lot
Final Machining & Marking
Face, bore, bolt holes cut and grade/heat number stamped
Alloy DIN 1.5415 Threaded Flange Surface Finish
As-Forged Black Finish
Shot Blasted
Machined Smooth Finish
Phosphate / Anti-Rust Coated
High Strength Low Alloy BLRF Flange Pressure Rating
| Temp (°C) | Class 150 | Class 300 | Class 600 | Class 900 | Class 1500 | Class 2500 |
|---|---|---|---|---|---|---|
| 38 | 15.9 | 41.4 | 82.7 | 124.1 | 206.8 | 344.7 |
| 100 | 13.3 | 34.8 | 69.6 | 104.4 | 173.9 | 289.9 |
| 200 | 11.2 | 29.2 | 58.3 | 87.5 | 145.8 | 243.0 |
| 300 | 10.0 | 26.1 | 52.1 | 78.2 | 130.3 | 217.2 |
| 400 | 6.5 | 24.3 | 48.6 | 72.9 | 121.5 | 202.5 |
| 450 | 4.6 | 23.4 | 46.8 | 70.2 | 117.1 | 195.1 |
Ready To Order Chromoly Steel Alloy LWNRF flange?Share drawing & quantity – factory price with MTC 3.1, dispatch same week.
Buy High Temp Alloy Steel Threaded Flange With Excellent Weldability & Corrosion Resistance For Oil, Gas & Petrochemical Piping
Applications of Chromium Alloy Steel Socket Weld Flange
Designed for demanding applications across refinery, power, and chemical industries.
Refinery Hydroprocessing Units
Power Plant Steam Piping
Petrochemical Process Piping
Fertiliser & Ammonia Plants
Boiler & Heat Exchanger Nozzles
Hydrogen Recycle Compressor Piping
Cross-Country Oil & Gas Pipelines
EPC & Skid Piping Packages
IBR Alloy Steel SORF Flange Testing Methods
PMI Testing
Positive Material Identification on every heat
Hydrostatic Test
Pressure test on assembled or blanked flanges
Ultrasonic Testing
UT for internal defects on thick forgings
Charpy V-Notch Impact
Low-temperature toughness check where specified
Dye Penetrant / MPI
Surface defect screening on machined faces
Third-Party Inspection
Witnessed testing and stage-wise sign-off
Alloy Steel Reducing Flange Delivered Weekly to the Following Countries
| Export to | Continent | Shipping Time |
|---|---|---|
 Oman |
Asia | 5 Days |
 USA |
North America | 40-60 Days |
 UAE |
Asia | 5 Days |
 Italy |
Europe | 30 Days |
Frequently Asked Questions
What is the price of High Strength Low Alloy BLRF Flange in India?
Price depends on grade, size, pressure class, and finish.
What sizes of Alloy Steel Reducing Flange are available?
Standard sizes range from 1/2″ to 24″, with larger sizes available.
Is IBR certification available for Ferritic Alloy Orifice Flange?
Yes, IBR certification is available for eligible orders.
Associate Traders and Importers Available in Below Locations For Quick Deliveries
| Continents | Country |
|---|---|
| South Carolina | USA |
| West Africa | Nigeria, Ghana, Senegal |
| North America | USA, Canada, Mexico |
| East Africa | Kenya, Ethiopia, Tanzania |
| North Africa | Egypt, Morocco, Algeria |
| Middle East | Saudi Arabia, Iran, Iraq |
| South Asia | India, Pakistan, Bangladesh |
| East Asia | China, Japan, South Korea |
| South America | Brazil, Argentina, Colombia |
| Melanesia | Fiji, Papua New Guinea |
6 Reasons to choose Ganpat Industrial Corporation
- Distributor of Heat Exchanger parts and Alloys for High Temperature applications.
- Stockholder and importer of Ferrous and non ferrous metals.
- Wide stock of prime quality austenitic and Ferritic Stainless Steel for Extreme pressure environment.
- Marine grade steel at lowest price in Mumbai.
- Compare Price per KG in India and China.
- Offer Resale price to local suppliers, traders and wholesalers in UAE, Saudi Arabia, Egypt, and USA