Hastelloy C276 flanges are high-performance corrosion-resistant flanges made from a nickel-molybdenum-chromium-iron alloy (UNS N10276), specifically designed for extremely corrosive environments. Due to their excellent resistance to pitting corrosion, crevice corrosion, and stress corrosion cracking, C276 flanges are widely used in chemical, pharmaceutical, environmental protection, seawater treatment, and other harsh process conditions.
Hastelloy C276 is an alloy that stands out due to its unique combination of elements: its main components are nickel, molybdenum, and chromium, with trace amounts of iron, tungsten, cobalt, and other elements. This combination of elements gives Hastelloy C276 exceptional properties, which are extended to the flanges made from it. The two most commonly used thread standards globally are BSP and NPT threads. Although their purposes are similar, they have different characteristics and applications.
Specifications of Hastelloy C276 Flanges
| Standards | ANSI/ASME B16.5, EN Flanges, BS 10, B16.47 Series A & B, EN-1092, ASME Flanges, BS Flanges, B16.48, DIN, DIN Flanges, GOST Flanges, ANSI Flanges, BS4504. |
| Size | 1/2″ (15 NB) to 48″ (1200NB) DN10~DN5000 |
| Pressure Rating | Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS |
| Production technique | Forged, Heat treated and machined |
| Connect Type/ Flange Face Type | Ring Type Joint (RTJ), Small Tongue, Raised Face (RF), Lap-Joint Face (LJF), Small Male-Female (SMF), Flat Face (FF), Large Tongue & Groove, Large Male-Female (LMF). |
| Application | Gas, Power, Chemical, Metallurgy, Petroleum, Shipbuilding, Construction etc. |
| Equipment | Pushing Machine, Press machine, Bending machine, Sand-blasting machine, electric bevelling machine etc |
Hastelloy C276 Flange Standards
Material Standards: ASTM B564 (forged flanges), UNS N10276, Werkstoff Nr. 2.4819, etc.
Dimension Standards:
ASME B16.5 (for pipe flanges and flange fittings from NPS 1/2“ to NPS 24”)
ASME B16.47 (for large-diameter steel flanges from NPS 26“ to NPS 60”)
EN 1092 (European flange standard)
DIN (German standard)
JIS (Japanese standard)
Common Types of Hastelloy C276 Flanges
| Flange Type | Features / Description |
| Weld Neck Flange | Suitable for high-pressure, high-temperature systems; provides strong and secure connection |
| Slip On Flange | Easy to install; suitable for medium and low pressure applications |
| Blind Flange | Used to close the end of a pipe; ideal for inspection and maintenance |
| Socket Weld Flange | Suitable for small-diameter, high-pressure pipelines |
| Threaded Flange | Ideal for systems where welding is not feasible |
| Lap Joint Flange | Works with stub ends; allows easy alignment and disassembly, suitable for systems requiring frequent maintenance |
Chemical Composition of ASME SB 564 N10276 Flanges
| CHEMICAL | LIMITS | Ni | Fe | Mn | C | Si | S | Cr | Mo | P | W | Co | V |
| Hastelloy C276 | MIN | Balance | 4 | 14.5 | 15 | 3 | |||||||
| MAX | 7 | 1 | 0.01 | 0.08 | 0.03 | 16.5 | 17 | 0.04 | 4.5 | 2.5 | 0.35 |
· High nickel (Ni) content: Ensures the stability of the alloy in reducing media, forming the foundation for corrosion resistance;
· Chromium (Cr): Provides oxidation resistance and corrosion resistance in oxidizing media (such as nitric acid);
· Molybdenum (Mo) + Tungsten (W): Significantly enhances resistance to localized corrosion (pitting corrosion, crevice corrosion), especially in chloride-containing environments;
· Low carbon (C): Prevents the formation of carbides between carbon and chromium, thereby preventing intergranular corrosion.
ASTM B564 Hastelloy C276 Mechanical Properties
| Grade | Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
| C276 | 8.89 g/cm3 | 1370 °C (2500 °F) | Psi – 52,000 , MPa – 355 | Psi – 1,15,000 , MPa – 790 | 40 % |
Equivalent Grades of Hastelloy C276 Flanges
| STANDARD | EN | UNS | WERKSTOFF NR. | JIS | GOST | OR |
| Hastelloy C276 | NiMo16Cr15W | N10276 | 2.4819 | NW 0276 | ХН65МВУ | ЭП760 |
Key Features
✅ Exceptional corrosion resistance: exhibits outstanding resistance to strong oxidizing and reducing media such as hydrochloric acid, sulfuric acid, chlorides, and chlorine gas.
✅ Superior mechanical properties: maintains stable strength and toughness even under high-temperature, high-pressure conditions or in strongly acidic environments.
✅ Strong resistance to localized corrosion: Effectively resists pitting corrosion, crevice corrosion, and intergranular corrosion.
✅ Good weldability: Easy to process and weld, with no reduction in corrosion resistance in the welded area.
✅ High-temperature performance: Hastelloy C276 exhibits excellent stability, particularly maintaining strength and structural integrity at high temperatures around 700°C.
Hastelloy C276 Flanges Dimension
| Nominal Pipe Size, NPS | Outside Diameter of Flange, O | Minimum Thickness of Flange, tf [Notes (2)-(4)] | Minimum Thickness Lap Joint, tf | Diameter of Hub, X | Hub Diameter Beginning of Chamfer Welding Neck, Ah [Note (5)] | Length Through Hub | Bore | |||
| Threaded/ Slip-on/ Socket Welding, Y | Lapped, Y | Welding Neck, Y | Minimum Slip-on/ Socket Welding, B | Minimum Lapped, B | ||||||
| 1/2 | 90 | 9.6 | 11.2 | 30 | 21.3 | 14 | 16 | 46 | 22.2 | 22.9 |
| 3/4 | 100 | 11.2 | 12.7 | 38 | 26.7 | 14 | 16 | 51 | 27.7 | 28.2 |
| 1 | 110 | 12.7 | 14.3 | 49 | 33.4 | 16 | 17 | 54 | 34.5 | 34.9 |
| 1 1/4 | 115 | 14.3 | 15.9 | 59 | 42.2 | 19 | 21 | 56 | 43.2 | 43.7 |
| 1 1/2 | 125 | 15.9 | 17.5 | 65 | 48.3 | 21 | 22 | 60 | 49.5 | 50.0 |
| 2 | 150 | 17.5 | 19.1 | 78 | 60.3 | 24 | 25 | 62 | 61.9 | 62.5 |
| 2 1/2 | 180 | 20.7 | 22.3 | 90 | 73.0 | 27 | 29 | 68 | 74.6 | 75.4 |
| 3 | 190 | 22.3 | 23.9 | 108 | 88.9 | 29 | 30 | 68 | 90.7 | 91.4 |
| 3 1/2 | 215 | 22.3 | 23.9 | 122 | 101.6 | 30 | 32 | 70 | 103.4 | 104.1 |
| 4 | 230 | 22.3 | 23.9 | 135 | 114.3 | 32 | 33 | 75 | 116.1 | 116.8 |
| 5 | 255 | 22.3 | 23.9 | 164 | 141.3 | 35 | 36 | 87 | 143.8 | 144.4 |
| 6 | 280 | 23.9 | 25.4 | 192 | 168.3 | 38 | 40 | 87 | 170.7 | 171.4 |
| 8 | 345 | 27.0 | 28.6 | 246 | 219.1 | 43 | 44 | 100 | 221.5 | 222.2 |
| 10 | 405 | 28.6 | 30.2 | 305 | 273.0 | 48 | 49 | 100 | 276.2 | 277.4 |
| 12 | 485 | 30.2 | 31.8 | 365 | 323.8 | 54 | 56 | 113 | 327.0 | 328.2 |
| 14 | 535 | 33.4 | 35.0 | 400 | 355.6 | 56 | 57 | 125 | 359.2 | 360.2 |
| 16 | 595 | 35.0 | 36.6 | 457 | 406.4 | 62 | 64 | 125 | 410.5 | 411.2 |
| 18 | 635 | 38.1 | 39.7 | 505 | 457.0 | 67 | 68 | 138 | 461.8 | 462.3 |
| 20 | 700 | 41.3 | 42.9 | 559 | 508.0 | 71 | 73 | 143 | 513.1 | 514.4 |
| 24 | 815 | 46.1 | 47.7 | 663 | 610.0 | 81 | 83 | 151 | 616.0 | 616.0 |
Application Scenarios
Hastelloy C276 flanges, renowned for their exceptional corrosion resistance, are primarily used in extreme environments where conventional materials cannot withstand the conditions. Typical applications include:
Chemical and Petrochemical Industries
Environmental Protection Industry
Pharmaceutical and Food Industries
Marine Engineering
Nuclear Industry
Installation and Maintenance Guidelines
Avoid contact between dissimilar metals: When in contact with metals of lower potential, such as carbon steel, galvanic corrosion may occur. Insulating gaskets (e.g., PTFE) or coatings should be used to isolate the metals;
Gaskets selection: Prioritize gaskets with matching corrosion resistance, such as PTFE or metal-backed gaskets, to prevent gasket material corrosion by the medium and subsequent leakage;
Cleaning and Pre-Treatment: Before installation, remove oil stains and oxide scale from the flange surface using a stainless steel wire brush or specialized cleaner to prevent impurities from affecting sealing performance;
Torque Control: Apply tightening torque according to flange specifications and pressure ratings in accordance with standards to avoid over-tightening, which can cause flange deformation or bolt breakage.
You can get an offer for products in below material forms:
-Pipe and Tube (EN 10216-5, ASTM A213, ASTM A249, A312, A790,)
-Forged Fitting and Flange (ASTM A182 , ASTM A105,ASTM B564 )
-Butt Weld Fittings (ASTM A234, ASTM A403,ASTM A815)
-Round bar , Billet (ASTM A276, ASTM A479)
– Plate, Sheet, Strip(ASTM A240, EN 10028-7, A480)
-Bolting, Nuts（ASTM A193, A194, A320）
Hastelloy C276 Flanges Exported Countries
We Export Hastelloy C276 Flanges to Saudi Arabia, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Turkey, Egypt, Yemen , Syria, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Cambodia, Argentina, Bolivia, Brazil, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States Of America, Canada, Mexico, Panama, Jamaica, Bahamas, Denmark, Norway, Germany, France,Italy, United Kingdom, Spain, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Finland, Ireland, Croatia, Malta, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan, Europe, Africa, Asia, North America, South America, Middle East.etc