What Makes Ganpat Industrial The First Call For Stainless Steel 304 Flanges
Forged, Not Fabricated
Every flange forged from certified UNS S30400 billet, never plate-cut
All Types, One Invoice
Weld Neck • Slip-On • Blind • Socket Weld — single PO, single dispatch
Class 150 To 2500 Ready
Full pressure range in stock, drilled to ASME B16.5 & B16.47
PMI-Checked Every Heat
Grade confirmed before machining, not assumed from a mill slip
Container-Ready In 7 Days
Standard NPS & class combinations ship the same week
Stainless Steel 304 Flange Overview
- 1Type: Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint, RTJ, Orifice
- 2Size Range: NPS ½″ to 48″ • Class 150 to 2500
- 3Facing: Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ)
- 4Common Grades: UNS S30400, EN 1.4301, AISI 304, ASTM A182 F304
- 5Standards: ASME B16.5, ASME B16.47, ASTM A182, MSS SP-44, EN 1092-1
- 6Origin: Indian origin • Japanese origin • European origin
Or call our Mumbai office: +91 22 6743 7134 • Same-week dispatch on standard classes
Ganpat Industrial Corporation, a manufacturer and exporter based in Mumbai with 25 years of experience in stainless steel pipe fittings, provides products to EPCs and distributors in India, UAE, and other parts of the Middle East.Our Stainless Steel 304 Flanges are hot forged out of certified UNS S30400/EN 1.4301 billets and thereafter are machined and bored to ASME B16.5 and ASME B16.47 tolerances.
Mumbai · Forging Manufacturer & Exporter
SS 304 Flanges Engineered For A Joint That Never Weeps
Ganpat Industrial manufactures and delivers ASTM A182 F304/UNS S30400 Flanges to engineers who require a bolt-up which will pass hydrotest on the first attempt refineries, water treatment facilities, dairy industries and fabricators in India, UAE and the Middle East
- ✓ISO 9001:2015
- ✓ISO 14001:2015
- ✓OHSAS 18001:2007
- ✓PED Certified
- ✓Petrofac Approved
Manufacturer & Supplier Of AISI 304 Weld Neck & Slip-On Flange With Size 1/2 to 48″ as Per ASME B16.5
Stainless Steel 304 Flanges Specification
ASTM A182 F304 Weld Neck Flange Size Range
- NPS: ½″ – 48″
- Class: 150 – 2500
- O.D.: 90 – 1350 mm
- Custom bore on drawing
SS 304 Slip-On Flange Governing Standard
- ASME B16.5 (½″–24″)
- ASME B16.47 (26″–60″)
- ASTM A182 / A960
- MSS SP-44
Stainless Steel 304 Flange Types
- Weld Neck & Slip-On
- Blind & Socket Weld
- Threaded & Lap Joint
- RTJ & Orifice
AISI 304 Socket Weld Flange Production Route
- Hot Forging
- CNC Bore & Face Turning
- Bolt Hole Drilling
- Stress Relieving
UNS S30400 Blind Flange Facing Options
- Raised Face (RF)
- Flat Face (FF)
- Ring Type Joint (RTJ)
- Serrated / Smooth Finish
EN 1.4301 Threaded Flange Grade Material
- UNS S30400
- EN 1.4301
- AISI 304
- ASTM A182 F304
SS 304 Lap Joint Flange Testing Protocol
- PMI Testing
- Hydrostatic Test
- Dimensional Check
- Third-Party Inspection
ASTM A182 F304 RTJ Flange Documentation
- Mill Test Certificate 3.1
- NABL Lab Report
- Radiography Report
- Certificate Of Origin
Stainless Steel 304 Orifice Flange Packaging Standard
- Individual Poly Wrap
- Wooden Pallet Boxes
- Flange Face Protectors
- Custom Export Crating
SS 304 Flange Manufacturing Origin
- Indian Origin
- Japanese Origin
- European Origin
- Traceable To Heat Number
Find Ready Stock Of SS 304 Weld Neck & Slip-On Flanges Most Ideal For ISO 9001:2015 & PED Approved
Types Of SUS 304 Flanges
Being a leading Stainless Steel 304 Flanges Manufacturer in India, we forge every flange type from Weld Neck to Lap Joint in-house
SS 304 Weld Neck Flange
ASME B16.5
Stainless Steel 304 Slip-On Flange
ASME B16.5
UNS S30400 Blind Flange
UNS S30400
AISI 304 Socket Weld Flange
AISI 304
EN 1.4301 Threaded Flange
EN 1.4301
SS 304 Lap Joint Flange
MSS SP-43
ASTM A182 F304 RTJ Flange
API 6A
304 Stainless Steel Orifice Flange
ASME B16.36
Need A Custom SS 304 Flange Class Or Bore Size?Share your P&ID or drawing — get a factory-price quote within 24 hours.
SS 304 Flange Dimensions Chart
| NPS | Bolt Circle (mm) | Flange O.D. (mm) | Thickness (mm) | Bolt Hole Ø (mm) | No. Of Bolts |
|---|---|---|---|---|---|
| 1″ | 79.2 | 108 | 14.2 | 15.7 | 4 |
| ½″ | 60.5 | 90 | 11.2 | 15.7 | 4 |
| 4″ | 190.5 | 229 | 22.4 | 19.1 | 8 |
| 2″ | 120.7 | 152 | 19.1 | 19.1 | 4 |
| 8″ | 298.5 | 343 | 25.4 | 22.4 | 8 |
| 6″ | 241.3 | 279 | 23.9 | 22.4 | 8 |
| 12″ | 431.8 | 483 | 31.8 | 25.4 | 12 |
| 10″ | 362.0 | 406 | 28.4 | 25.4 | 12 |
AISI 304 Socket Weld Flange Weight Chart
As a trusted Stainless Steel 304 Flanges Supplier in India, we publish accurate per-piece weights for every NPS and class
| NPS | Class | Weight / Pc (kg) |
|---|---|---|
| 1″ | 150 | 1.6 |
| ½″ | 150 | 0.9 |
| 4″ | 150 | 6.4 |
| 2″ | 150 | 3.0 |
| 8″ | 150 | 17.6 |
| 6″ | 150 | 10.8 |
| 12″ | 150 | 39.5 |
| 10″ | 150 | 27.9 |
ASTM A182 F304 Weld Neck vs SS 304 Slip-On Flange
SS 304 Slip-On Flange
- 66% calculated strength vs Weld Neck
- 33% fatigue life vs Weld Neck
- 2 fillet welds required (inside + outside)
- Not reliably radiographable
ASTM A182 F304 Weld Neck Flange
- 100% pipe-equivalent strength (baseline)
- 100% fatigue life (baseline)
- 1 full-penetration butt weld
- 100% radiographable per ASME B31.3
Comparing Flange Types For A New Line?Send your service conditions — we recommend the right type & class.
EN 1.4301 Flange Installation Process
1. Verify Rating & Documentation
Match NPS, class and facing to spec; check the mill certificate.
2. Inspect The Sealing Face
Clean the face and check for scratches or tool marks.
3. Align Bore & Bolt Holes
Square the flange and straddle bolt holes on centreline.
4. Position The Correct Gasket
Centre the rated gasket on the face; avoid double-gasketing.
5. Tighten In A Star Pattern
Snug by hand, then torque criss-cross in stages.
6. Hydrotest & Final Check
Pressure-test, check for weeping, then re-torque once cool.
Not Sure Which Flange Type Fits Your Line?Share pressure, temperature & service — we’ll recommend the type.
Chemical Composition Of AISI 304 Socket Weld Flange
ChromiumCr
18.00–20.00%
NickelNi
8.00–11.00%
ManganeseMn
≤ 2.00%
SiliconSi
≤ 1.00%
CarbonC
≤ 0.08%
PhosphorusP
≤ 0.045%
SulphurS
≤ 0.030%
IronFe
Balance
Mechanical Properties Of SS 304 Threaded Flange
Tensile Strength
≥ 515 MPa
Load Bearing
Yield Strength (0.2%)
≥ 205 MPa
Design Limit
Elongation (2″)
≥ 35%
Ductility
Hardness
≤ 201 HB / 92 HRB
Wear Resistance
SS 304 Slip-On Flange Equivalent Grades
ASTM / ASME
- A182 F304
- ASME B16.5
- ASME B16.47
- A240 (plate)
EN / DIN
- EN 1092-1
- 1.4301
- DIN 2635 / 2576
BS
- BS 10 Table E/F
- 304S31
- BS EN 1092
JIS
- SUS 304
- JIS B2220
- JIS B2239
IS
- IS 6392
- Grade UNS S30400
- IS 2062 (mating)
GB
- GB/T 9119
- 06Cr19Ni10
- GB/T 17241
HSN Code Of UNS S30400 Blind Flange
HSN Heading
7307
Tube or pipe fittings of iron or steel
SS Flange Sub-Heading
7307 21 00
Flanges of stainless steel
GST Rate
18%
Standard rate on stainless steel flanges
Typical MOQ
No Minimum
Trial lots to full container loads
Application Of INOX 304 Lap Joint Flange
As a reliable Stainless Steel 304 Flanges Supplier in India, our flanges serve refineries, dairies and water treatment plants nationwide
Food & Dairy Processing
Chemical & Petrochemical Lines
Water & Effluent Treatment
Marine & Offshore Piping
Refinery & Process Skids
Steam & Utility Headers
Pharma & Biotech Piping
Pump & Valve End Connections
SS 304 Orifice Flange Goes Through Four Checks
Material Testing
PMI & hydrostatic test on every batch
Test Certificates
MTC 3.1 issued with heat traceability
Documentation
Packing list, invoice & origin certificate
Export Packaging
Face-protected & crated for sea freight
EN 1.4301 Threaded Flange Documentation Offered
Mill Test Certificate 3.1
Chemistry & mechanical results traced to heat number
Every Order
Radiography Report
Weld & casting integrity check for critical lines
On Request
Certificate Of Origin
For customs clearance & import duty processing
Export Orders
Packing List & Invoice
PO-matched, HSN & GST breakup included
Every Order
Buying In Bulk For A Project?Send your BOQ — factory price, MTC 3.1, dispatch same week.
Weekly Delivery Of Stainless Steel 304 Flanges In Below Countries
| Export to | Continent | Shipping Time |
|---|---|---|
Brazil |
South America | 45–60 Days |
Qatar |
Asia | 7 Days |
Egypt |
Africa | 18 Days |
Netherlands |
Europe | 30 Days |
Monthly Delivery Of AISI 304 Weld Neck Flanges In Below Countries
| Export to | Continent | Shipping Time |
|---|---|---|
Thailand |
Asia | 7 Days |
Indonesia |
Asia | 9 Days |
Philippines |
Asia | 14 Days |
Spain |
Europe | 30 Days |
Frequently Asked Questions
What is the price of a Stainless Steel 304 Flange?
Price depends on NPS, pressure class, type and facing
Is a UNS S30400 Flange suitable for high-pressure lines?
Yes, UNS S30400 Flange Suitable For high-pressure lines.
What is the HSN code for a stainless steel flange?
Stainless steel flanges fall under HSN 7307 21 00
Can SS 304 Flanges be welded to carbon steel pipe?
Yes, SS 304 Flanges be welded to carbon steel pipe
What is the minimum order quantity?
Ganpat Industrial supplies from small trial lots to full container loads there is no fixed minimum on standard NPS & class combinations.
We Collaborate With Traders In The Following Country
| Saudi Arabia | Oman | UAE | South Africa | Nigeria |
|---|---|---|---|---|
| USA | Kenya | Algeria | Tanzania | Angola |
| Ethiopia | Ghana | Zambia | Morocco | Gabon |
| New South Wales | Egypt | Mozambique | – | Tunisia |
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