ASTM A182 F347 / F347H Stainless Steel Flanges – Manufacturer, Supplier & Exporter in Mumbai, India
Niobium‑stabilized • High‑temperature & creep strength • Fast global dispatch • Competitive pricing
Introduction
Dipti Metal Industries is a manufacturer, supplier and exporter of ASTM A182 F347 / F347H stainless steel flanges from Mumbai, India. Grade F347 (UNS S34700 / WNR 1.4550) is Nb (columbium) stabilized for intergranular corrosion resistance, while F347H (UNS S34709 / WNR 1.4961) has a higher carbon range for improved creep strength at elevated temperatures.
Grades & 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)
| Element | F347 (%) | F347H (%) |
|---|---|---|
| C | ≤ 0.08 | 0.04 – 0.10 |
| Cr | 17.0 – 19.0 | 17.0 – 19.0 |
| Ni | 9.0 – 13.0 | 9.0 – 13.0 |
| Nb + Ta (Cb) | Stabilized | Stabilized |
| Mn | ≤ 2.00 | ≤ 2.00 |
| Si | ≤ 1.00 | ≤ 1.00 |
| P | ≤ 0.045 | ≤ 0.045 |
| S | ≤ 0.030 | ≤ 0.030 |
Mechanical Properties (Typical)
| Property | F347 | F347H |
|---|---|---|
| Tensile Strength | ≥ 515 MPa | ≥ 515 MPa |
| Yield Strength (0.2% Offset) | ≥ 205 MPa | ≥ 205 MPa |
| Elongation | ≥ 40% | ≥ 40% |
| Hardness | ≤ 201 HB | ≤ 201 HB |
Available Types (F347 & F347H)
Manufactured in ASTM A182 F347 and ASTM A182 F347H across sizes and 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
- Refinery heaters, reformers, superheaters
- High‑temp process piping with sensitization risk
- Marine & chemical plants requiring IGC resistance
Frequently Asked Questions
What’s the key difference between F347 and F347H?
F347H has a higher carbon range (~0.04–0.10%) than F347 (≤0.08%), improving creep strength for prolonged high‑temperature service.
Are RTJ flanges available in F347H?
Yes—RTJ grooves (R/RX/BX) are available. Confirm ring type and pressure class 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 inspections on request.