ASTM A182 F321 Stainless Steel Flanges – Manufacturer, Supplier & Exporter in Mumbai, India
Titanium‑stabilized • Heat‑resistant grade • Fast global dispatch • Competitive pricing
Introduction
Dipti Metal Industries is a manufacturer, supplier and exporter of ASTM A182 F321 stainless steel flanges from Mumbai, India. Grade F321 (UNS S32100 / WNR 1.4541) is titanium‑stabilized for resistance to carbide precipitation and intergranular corrosion after welding, making it reliable for sustained high‑temperature service.
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 F321)
| Element | Content (%) |
|---|---|
| C | ≤ 0.08 |
| Cr | 17.0 – 19.0 |
| Ni | 9.0 – 12.0 |
| Ti | ≥ 5 × C% (min) |
| 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 F321)
Supplied in F321 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
- High‑temperature service with sensitization risk
- Refineries, chemical & petrochemical plants
- Power generation, aerospace exhaust systems
Frequently Asked Questions
Why choose F321 over F304/F316 for high temperature?
F321 is titanium‑stabilized to resist carbide precipitation and intergranular corrosion during/after welding, making it suitable for prolonged high‑temperature exposure.
Are RTJ flanges available in F321?
Yes—RTJ grooves (R/RX/BX) are available across select pressure classes. Confirm ring type at RFQ.
Can you provide EN 10204 MTC and TPI?
Yes. EN 10204 3.1/3.2 MTC with full traceability; SGS/TÜV/Lloyd’s/BV/ABS/DNV on request.