Hastelloy B2 Flanges
Hastelloy B3 Flanges ( UNS N10675 ) Manufacturer & Supplier
Hastelloy B3 Flanges are advanced nickel-molybdenum alloy flanges known for their exceptional resistance to hydrochloric acid, sulfuric acid, acetic acid, formic acid, and other strong reducing media. The alloy offers improved thermal stability compared to Hastelloy B2, allowing it to withstand higher temperatures while maintaining corrosion resistance and mechanical strength.
Engineered for critical industrial processes, Hastelloy B3 flanges perform excellently in aggressive chemical environments, offer resistance against stress corrosion cracking, and deliver long-lasting durability even under high pressure and elevated temperatures.
Key Features
Outstanding corrosion resistance in highly reducing environments.
Improved thermal stability compared to earlier Hastelloy B grades.
Excellent resistance to hydrochloric acid at all concentrations and temperatures.
Superior resistance to pitting & stress corrosion cracking.
High strength & durability at elevated temperatures.
Excellent weldability and formability.
Ideal for severe chemical processing environments.
Specification
| Specification | Details |
|---|---|
| Grade | Hastelloy B3 |
| Standard | ASTM B564 / ASME SB564 |
| 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 |
| Production Type | Forged, Heat Treated, Machined |
| Form | Flanges, Rings, Discs, Custom Forgings |
Equivalent Grade
| Standard | Grade |
|---|---|
| UNS | N10675 |
| Werkstoff Nr. | 2.4600 |
| BS / EN | – |
| JIS | NW0675 |
Available Sizes
Nominal Sizes: ½” to 48”
Schedules: SCH 10 to SCH XXS
Custom Sizes: Available on request
Pressure Ratings: Class 150–2500
Chemical Composition
| Element | Content (%) |
|---|---|
| Nickel (Ni) | Balance |
| Molybdenum (Mo) | 28 – 32 |
| Iron (Fe) | 1.5 max |
| Chromium (Cr) | 1.5 max |
| Cobalt (Co) | 3 max |
| Manganese (Mn) | 1 max |
| Carbon (C) | 0.01 max |
| Silicon (Si) | 0.10 max |
| Phosphorus (P) | 0.04 max |
| Sulfur (S) | 0.03 max |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 760 MPa (min) |
| Yield Strength (0.2% offset) | 350 MPa (min) |
| Elongation | 40% (min) |
| Hardness | 89 HRB (max) |
Physical Properties
| Property | Value |
|---|---|
| Density | 9.22 g/cm³ |
| Melting Point | 1345–1385°C |
| Thermal Conductivity | 8.9 W/m·K |
| Electrical Resistivity | 1.3 µΩ·m |
| Specific Heat | 420 J/kg·K |
Types of Hastelloy B3 Flanges
Weld Neck Flanges (WN)
Slip-On Flanges (SO)
Blind Flanges (BLRF)
Socket Weld Flanges (SWRF)
Threaded Flanges (THRF)
Lap Joint Flanges (LJRF)
RTJ Flanges
Orifice Flanges
Reducing Flanges
Long Weld Neck Flanges
Corrosion Resistance
Hastelloy B3 flanges provide:
Exceptional resistance to hydrochloric acid at all temperatures
Excellent performance in sulfuric, acetic, and formic acids
Resistance to stress corrosion cracking
Superior protection against pitting & crevice corrosion
Stability against knife-line attack after welding
Outstanding resistance in reducing chemical environments
The alloy’s improved stability allows for better performance under fluctuating thermal conditions.
Heat Resistance
High-temperature strength up to 900°C
Withstands temperature fluctuations without loss of corrosion resistance
Excellent oxidation resistance in controlled environments
Suitable for high-heat chemical plants, reactors & pressure vessels
Heat Treatment
Solution Annealing: 1149°C followed by rapid quenching
Restores corrosion resistance after fabrication
Prevents grain-boundary carbide precipitation
Enhances mechanical properties
Welding
Hastelloy B3 flanges offer outstanding weldability with the following methods:
TIG (GTAW)
MIG (GMAW)
SMAW (Stick Welding)
Welding Characteristics:
Low risk of hot cracking
No post-weld heat treatment (PWHT) generally required
Use matching filler metals (such as ERNiMo-10) for best performance
Fabrication
Excellent formability and workability
Suitable for cold and hot forming
Avoid prolonged exposure to temperatures between 540°C – 760°C
Anneal after heavy forming
Compatible with modern CNC machining techniques
Applications
Chemical Processing Industry
Petrochemical Plants
Pollution Control Equipment
Acid Production Units
Pharmaceutical Processing
Hydrogen Chloride Gas Handling
Heat Exchangers & Pressure Vessels
Pulp & Paper Industry
Marine & Offshore Applications
Nuclear Fuel Reprocessing