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Hastelloy C276 Flanges Supplier in Mumbai, India – ASTM B564 UNS N10276
Nicorex Alloys is an ISO 9001 and ISO 14001 certified supplier and stockist of Hastelloy C276 flanges in Mumbai, India. The ASTM standard for Hastelloy C276 flanges is ASTM B564 (UNS N10276).
Hastelloy C276 is one of the most versatile nickel alloys that simultaneously resists both oxidising and reducing acids while maintaining immunity to chloride stress corrosion cracking. The alloy contains Ni 57%, Cr 16%, Mo 16%, and W 4%, with ultra-low C (0.01% max) and Si (0.08% max) that prevent grain boundary precipitates in the weld HAZ. This makes C276 the first Ni-Cr-Mo alloy engineered for as-welded service, eliminating PWHT on flange-to-pipe joints.
Alloy C-276 flanges are the industry standard for piping systems that must handle many aggressive acids. They provide reliable performance in harsh environments such as mixed-acid chemical plants, FGD scrubber units, and sour gas pipelines. These flanges, designated UNS N10276 (Werkstoff 2.4819, Nicrofer 5716), offer high strength with a minimum tensile strength of 790 MPa (115 ksi). They are made in all standard flange types (such as weld neck, slip-on, blind, socket weld, threaded, lap joint, long weld neck, ring-type joint, spectacle blind, and reducing flanges) so they can be used for almost any piping connection.
These flanges are manufactured in sizes from NPS 1/2″ up to 60″ and in pressure classes 150 through 2500. Every flange is approved for sour service under NACE MR0175 / ISO 15156. It is supplied with EN 10204/3.1B test certificates and full positive material identification (PMI) records.
Hastelloy Alloy C276 Flange Specifications
| Standard | ASTM B564 / ASME SB564 |
|---|---|
| Flange Types | WNRF, SORF, BLRF, SWRF, Threaded, LJRF, LWNRF, RTJ, Spectacle Blind, Orifice, Reducing |
| Size (ASME B16.5) | NPS 1/2” to NPS 24” |
| Size (ASME B16.47) | NPS 26” to NPS 60” |
| Pressure Classes | 150, 300, 400, 600, 900, 1500, 2500 |
| DIN Ratings | PN6, PN10, PN16, PN25, PN40, PN64 |
| Face Types | RF, FF, RTJ, Tongue & Groove, Male & Female |
| Dimensional Standards | ASME B16.5, B16.47, B16.36, B16.48, MSS SP-44, EN 1092-1, JIS B2220 |
Chemical Composition of Hastelloy C276 Flanges
| Element | Nickel (Ni) | Chromium (Cr) | Molybdenum (Mo) | Tungsten (W) | Iron (Fe) | Cobalt (Co) | Vanadium (V) | Silicon (Si) | Carbon (C) | Manganese (Mn) | Copper (Cu) | Phosphorus (P) | Sulfur (S) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Alloy C276 | Balance (~57) | 14.5 – 16.5 | 15.0 – 17.0 | 3.0 – 4.5 | 4.0 – 7.0 | 2.5 max | 0.35 max | 0.08 max | 0.01 max | 1.0 max | 0.50 max | 0.04 max | 0.03 max |
Mechanical Properties of ASTM B564 UNS N10276 Flange
| Tensile Strength (min) | Yield 0.2% Offset (min) | Elongation (min) | Hardness (max) |
|---|---|---|---|
| 790 MPa (115 ksi) | 355 MPa (51.5 ksi) | 40% | 241 HB / 100 HRB |
Solution annealing at 1121°C (2050°F) followed by water quench sets these properties. Re-annealing is recommended after cold working exceeding 7% outer fibre elongation. Charpy impact values remain high at cryogenic temperatures.
Hastelloy Alloy C276 Flange Equivalent Grades
| UNS | Werkstoff | DIN | BS | JIS | GOST |
|---|---|---|---|---|---|
| N10276 | 2.4819 | NiMo16Cr15W / 17744 | BS 3076 NA57 | NW 0276 | ХН65МВУ |
Get Hastelloy C276 Flanges at Competitive Prices
Available Types of Hastelloy C276 Flanges
Nickel Alloy C-276 flanges are forged to ASTM B564 in the following types:
Hastelloy C276 Weld Neck Flanges (WNRF)
Hastelloy C276 Slip-On Flanges (SORF)
Hastelloy C276 Blind Flanges (BLRF)
Hastelloy C276 Socket Weld Flanges (SWRF)
Hastelloy C276 Lap Joint Flanges (LJRF)
Alloy C276 Long Weld Neck Flanges (LWNRF)
Nickel Alloy C276 Threaded Flanges
Hastelloy C276 Ring Type Joint Flanges (RTJ)
Hastelloy C276 Spectacle Blind Flanges
Hastelloy Alloy C276 Reducing Flanges
Pressure-Temperature Ratings for Hastelloy C276 Flanges
UNS N10276 flanges fall under Material Group 3.8 in ASME B16.5. Maximum rated temperature: 675°C (1250°F). Rated working pressures:
| Temp. | Cl. 150 (bar) | Cl. 300 (bar) | Cl. 600 (bar) |
|---|---|---|---|
| -29 to 38°C | 19.6 | 51.1 | 102.1 |
| 100°C | 17.7 | 46.6 | 93.2 |
| 200°C | 15.8 | 41.4 | 82.7 |
| 300°C | 14.5 | 37.9 | 75.8 |
| 400°C | 13.4 | 35.2 | 70.3 |
| 500°C | 11.7 | 30.7 | 61.4 |
| 675°C (max) | 6.9 | 18.1 | 36.2 |
Class 900, 1500, and 2500 ratings are specified in ASME B16.5 Table 2-3.8.
Industrial Applications of Hastelloy C276 Flanges
- Chemical Processing: Used for reactor columns, heat exchanger nozzles, and acid storage tanks that handle acids like HCl, H₂SO₄, and HNO₃ in multi-purpose plants.
- Oil & Gas – Sour Service: Used for wellhead and Christmas tree connections in oil and gas fields that contain H₂S (sour gas). Pipeline manifold flanges per NACE MR0175. C276 immunity to sulphide stress cracking makes it standard for sour-service connections.
- Flue Gas Desulfurisation (FGD): Scrubber inlet/outlet duct flanges and slurry pump connections where hot H₂SO₄ mist combines with chloride from coal combustion.
- Pharmaceuticals & Fine Chemicals: Reactor nozzle flanges for chlorinated solvents, ensuring corrosion resistance and leak-tight performance in critical processes.
- Pulp and Paper: Used for bleach plant piping that carries chlorine dioxide (ClO₂) and hypochlorite, ensuring tight, leak-free joints in strong oxidising conditions.
- Marine and Offshore: Used in seawater cooling and desalination lines, built to resist chloride corrosion for long service life in marine environments.
- Waste Treatment & Pollution Control: Hastelloy C276 flanges are particularly used in stackliners and incineration facilities to connect critical components and piping systems.
How to Order Hastelloy C276 Flanges from Nicorex Alloys
To order Hastelloy C726 Flanges, the following details are required:
- Flange Type (WNRF, SORF, BLRF, SWRF, Threaded, Lap Joint, RTJ, LWN, Spectacle Blind)
- Size (NPS and DN)
- Pressure Class (Class 150–2500 or PN rating)
- Face Type (RF, FF, RTJ, T&G)
- Material Grade (ASTM B564 UNS N10276 — specify if NACE MR0175 compliance required)
- Dimensional Standard (ASME B16.5, B16.47, EN 1092-1, DIN, JIS, etc.)
- Quantity (number of pieces or weight in kg)
- Condition (Solution Annealed — standard)
- Surface Finish Requirements
- Testing Requirements (MTC 3.1, PMI, UT, RT, Third-Party Inspection)
- Documentation (EN 10204 Type 3.1, NACE compliance certificate)
- Packaging (standard, export-grade wooden case, ISPM 15 compliant)
- Delivery destination (domestic India / international export)
- Custom sizes and non-standard classes available. Quotation within 24 hours.
Frequently Asked Questions
What ASTM Specification Covers Hastelloy C276 Forged Flanges?
ASTM B564 / ASME SB564 covers UNS N10276 forged flanges. ASTM B462 also applies.
What is the Maximum Service Temperature for C276 Flanges per ASME B16.5?
675°C (1250°F) per ASME B16.5 Material Group 3.8. Above this, no pressure-temperature ratings are provided.
What is the difference between Hastelloy C276 and Hastelloy C22 Flanges?
Do C276 Flanges require Post-Weld Heat Treatment?
No. Ultra-low C (0.01%) and Si (0.08%) prevent HAZ precipitates. Filler: ERNiCrMo-4 (AWS A5.14) for GTAW; ENiCrMo-4 (AWS A5.11) for SMAW.
What is the Price of Hastelloy C276 Flanges per kg in India?
What is the typical lead time for Hastelloy C276 WNRF flanges?
Standard sizes (NPS 1/2”–12”, Class 150–600): 3–5 days from stock. Non-standard and Class 900–2500: 4–8 weeks.