Hastelloy C276 Flanges
Hastelloy C276 Flanges ( ASTM B564 UNS N10276 ) Manufacturer & Supplier
Hastelloy C276 Flanges are made from the world’s most versatile corrosion-resistant nickel-molybdenum-chromium alloy. This alloy is globally recognized for its outstanding resistance to pitting, crevice corrosion, stress corrosion cracking, and a wide range of corrosive chemicals, including strong acids and chlorides.
C276 is highly resistant to both oxidising and reducing media, making it the preferred material for chemical processing equipment, heat exchangers, reactors, pollution control systems, and severe offshore environments. These flanges provide excellent mechanical strength, superior weldability, and excellent performance under extreme temperatures and pressure conditions.
Key Features
Exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking.
Resists a wide range of corrosive chemicals such as chlorides, chlorine gas, sulfuric acid & nitric acid.
Excellent metallurgical stability and weldability.
High-temperature strength up to 1100°C.
Outstanding performance in both oxidizing and reducing media.
Resistant to wet chlorine gas, hypochlorites, and chlorine dioxide.
Suitable for high-pressure, high-temperature, and aggressive chemical applications.
Specification
| Specification | Details |
|---|---|
| Grade | Hastelloy C276 |
| Standard | ASTM B564 / ASME SB564 |
| UNS | N10276 |
| Werkstoff Nr. | 2.4819 |
| Flange Types | WN, SO, BLRF, SWRF, THRF, LJRF, RTJ, Orifice, Reducing |
| Size Range | ½” to 48” |
| Pressure Class | 150#, 300#, 600#, 900#, 1500#, 2500# |
| Face Type | RF / FF / RTJ |
| Manufacturing | Forged / Machined / Heat Treated |
| Form | Flanges, Rings, Discs, Forged Components |
Equivalent Grade
| Standard | Grade |
|---|---|
| UNS | N10276 |
| Werkstoff Nr. | 2.4819 |
| EN | NiMo16Cr15W |
| JIS | NW0276 |
Available Sizes
NPS: ½” to 48”
Thickness: SCH 10 – SCH XXS
Pressure Ratings: Class 150 to Class 2500
Custom sizes available on request
Chemical Composition
| Element | Content (%) |
|---|---|
| Nickel (Ni) | Balance |
| Molybdenum (Mo) | 15 – 17 |
| Chromium (Cr) | 14.5 – 16.5 |
| Iron (Fe) | 4 – 7 |
| Tungsten (W) | 3 – 4.5 |
| Cobalt (Co) | ≤ 2.5 |
| Manganese (Mn) | ≤ 1 |
| Carbon (C) | ≤ 0.01 |
| Silicon (Si) | ≤ 0.08 |
| Vanadium (V) | ≤ 0.35 |
| Phosphorus (P) | ≤ 0.04 |
| Sulfur (S) | ≤ 0.03 |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 690 MPa (min) |
| Yield Strength (0.2% offset) | 283 MPa (min) |
| Elongation | 40% (min) |
| Hardness | 89 HRB (max) |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.89 g/cm³ |
| Melting Point | 1325 – 1370°C |
| Thermal Conductivity | 10.2 W/m·K |
| Electrical Resistivity | 1.25 µΩ·m |
| Specific Heat | 420 J/kg·K |
Types of Hastelloy C276 Flanges
Weld Neck Flanges (WN)
Slip-On Flanges (SO)
Blind Flanges (BLRF)
Threaded Flanges (THRF)
Socket Weld Flanges (SWRF)
Lap Joint Flanges (LJRF)
Ring Type Joint Flanges (RTJ)
Long Weld Neck Flanges
Orifice Flanges
Reducing Flanges
Custom Machined Flanges
Corrosion Resistance
Hastelloy C276 provides superior corrosion resistance in a wide range of environments:
Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking
Exceptional performance in chlorides, chlorine dioxide & hypochlorites
Resistant to sulfuric, phosphoric, acetic, hydrochloric & nitric acids
Outstanding resistance in oxidizing and reducing media
Performs well in seawater and marine environments
Ideal for highly corrosive chemical processes & mixed acid solutions
Heat Resistance
High-temperature strength up to 1100°C
Excellent oxidation resistance
Maintains structural stability under fluctuating thermal conditions
Suitable for furnaces, reactors, heat exchangers, and high-temperature chemical equipment
Heat Treatment
Solution Annealing: 1121°C
Cooling: Rapid quenching
Eliminates residual stresses
Restores corrosion resistance after forming or welding
Enhances mechanical performance
Welding
Hastelloy C276 is one of the most weldable nickel alloys.
Compatible Welding Methods:
GTAW (TIG)
GMAW (MIG)
SMAW (Stick)
Weldability Advantages:
Low risk of cracking
No post-weld heat treatment generally required
Weld joints maintain corrosion resistance equivalent to base metal
Recommended filler metal: ERNiCrMo-4
Fabrication
Excellent forming and shaping capabilities
Suitable for cold and hot working
Avoid forming between 650 – 1000°C due to carbide precipitation risk
Requires carbide tools for machining due to work-hardening
Anneal after heavy cold work
Applications
Chemical Processing Plants
Petrochemical Industry
Pharmaceutical & Biotech Processing
Pollution Control and Flue Gas Desulfurization Systems
Offshore & Marine Engineering
Heat Exchangers & Pressure Vessels
Nuclear Waste Handling Systems
Pulp & Paper Chemical Machinery
Acid Production & Acid Pickling Systems
Desalination Plants