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| UNS Number | N10665 |
|---|---|
| ASTM/ASME Standard | ASTM B335 / ASME SB335 |
| Tensile Strength | 760 MPa min |
| Yield Strength | 350 MPa min |
| Density | 9.22 g/cm³ |
| Max Service Temperature | 900°C |
| Element | Composition (%) |
|---|---|
| Ni | bal |
| Mo | 26.0–30.0 |
| Cr | ≤1.0 |
| Fe | ≤2.0 |
| Co | ≤1.0 |
| C | ≤0.02 |
| Mn | ≤1.0 |
| Si | ≤0.10 |
Hastelloy B2 fasteners derive their exceptional performance from a nickel-molybdenum composition, typically containing around 68% nickel and 28% molybdenum, with tightly controlled levels of iron, chromium, and carbon. The high molybdenum content is the primary contributor to outstanding resistance against reducing acid environments, particularly hydrochloric and sulfuric acids at all concentrations and temperatures. Low carbon and silicon content minimize carbide precipitation during welding, preserving corrosion resistance in heat-affected zones while chromium is kept minimal to avoid compromising performance in strongly reducing media.
These alloying characteristics translate into fasteners with excellent resistance to pitting, crevice corrosion, and stress corrosion cracking in non-oxidizing chemical processing environments. Hastelloy B2 fasteners maintain high tensile and yield strength across elevated temperatures, ensuring reliable clamping force and structural integrity in demanding applications. Their combination of corrosion resistance, thermal stability, and mechanical strength makes them ideal for critical fastening applications in chemical processing, pharmaceutical, and pollution control industries where reducing acids are prevalent.
Specifications
Hastelloy B2 Fasteners are specified by corrosion-resistant nickel-molybdenum alloy mechanical properties, dimensional tolerances, and technical data suited to demanding service conditions. Their performance is typically defined by strength, hardness, and size requirements, with applicable industry standards guiding compatibility where specified.
| Property | Value |
|---|---|
| Tensile Strength | 760 MPa min |
| Yield Strength (0.2% Offset) | 350 MPa min |
| Elongation | 40% min |
| Hardness | ≤100 HRB |
| Modulus of Elasticity | 216 GPa |
| Thermal Expansion (20-100°C) | 10.3 µm/m·°C |
| Thermal Conductivity | 10.9 W/m·K |
| Density | 9.22 g/cm³ |
| Melting Range | 1330-1380°C |
| Maximum Service Temperature | 900°C |
| Standard | Details |
|---|---|
| Bolt Standard | ASME B18.2.1 |
| Stud Bolt Standard | ASME B16.5 / MSS SP-75 |
| Nut Standard | ASME B18.2.2 |
| Washer Standard | ASME B18.22.1 |
| Thread Form | UNC, UNF, Metric |
| Diameter Range | M6 to M64 / 1/4" to 2.5" |
| Length Range | 10mm to 300mm |
| Available Product Forms | Bolts, Studs, Nuts, Washers, Screws |
| Custom Sizes | Available on request |
| Manufacturing Standards | ASTM B335, ASME SB335 |
Applications
