ASTM A182 F304 Stainless Steel Flanges – Manufacturer, Supplier & Exporter in Mumbai, India
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Introduction
Dipti Metal Industries is a manufacturer, supplier and exporter of ASTM A182 F304 stainless steel flanges from Mumbai, India. Grade F304 (UNS S30400 / WNR 1.4301) is a versatile 18/8 austenitic stainless steel offering a balance of corrosion resistance, strength and weldability for general service in process and utility lines.
Grade & Equivalents
Material & Dimensional Standards
Material: ASTM A182 / ASME SA182
Dimensions: ASME B16.5, B16.47 Series A/B, MSS SP‑44; EN 1092‑1 and equivalents
Technical Specifications
Pressure Class: 150, 300, 600, 900, 1500, 2500
Sizes: 1/2” NB to 48” NB (custom on request)
Facing: RF (Raised Face), RTJ (Ring Type Joint), FF (Flat Face)
Finish: Machined, Serrated, Spiral Serrated
Testing: PMI, Hydro, NDT, Ultrasonic; TPI available
Marking & Docs: Grade • Heat No. • Size • Class • Origin; EN 10204 3.1/3.2
Chemical Composition (Typical F304)
| Element | Content (%) |
|---|---|
| C | ≤ 0.08 |
| Cr | 18.0 – 20.0 |
| Ni | 8.0 – 11.0 |
| Mn | ≤ 2.00 |
| Si | ≤ 1.00 |
| P | ≤ 0.045 |
| S | ≤ 0.030 |
Mechanical Properties (Typical)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Offset) | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 201 HB |
Available Types (ASTM A182 F304)
Supplied in F304 across standard sizes and pressure classes.
Common Types
- Weld Neck (WNRF), Slip‑On (SOFF), Blind (BLRF)
- Threaded (NPT/BSP), Socket Weld (SWRF), Lap Joint (LJ)
- Long Weld Neck (LWN), Reducing / Expander
- Orifice, Spectacle Blind / Spade & Spacer, Ring Spacer
- Plate / Ring / Backing flanges; RTJ grooves (R/RX/BX)
Applications
- General service in refineries, chemical & petrochemical plants
- Food & pharma utilities where 304 is acceptable
- Water, air, fire‑fighting & HVAC piping
Frequently Asked Questions
When should I choose F304 vs F304L?
Choose F304 for slightly higher strength when welding heat input is controlled and sensitization risk is low. Use F304L for improved resistance to intergranular corrosion after welding.
Do you supply PN‑rated and JIS drilling?
Yes, we support EN 1092‑1 PN 6–40 and JIS B2220 (5K–40K) on request, besides ASME drilling.
Can you provide full traceability and 3.2 certification?
Yes. EN 10204 3.1/3.2 MTC, heat mapping and third‑party inspection (SGS/TÜV/Lloyd’s/BV/ABS/DNV) are available.