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| Specification | Value |
|---|---|
| UNS Number | N10675 |
| ASTM/ASME Standard | ASTM B335 / ASME SB335 |
| Tensile Strength | 760 MPa min |
| Yield Strength | 350 MPa min |
| Density | 9.24 g/cm³ |
| Max Service Temperature | 900°C |
| Element | Composition (%) |
|---|---|
| Ni | bal |
| Mo | 28.5–31.5 |
| Cr | 1.0–3.0 |
| Fe | 1.0–3.0 |
| Co | ≤3.0 |
| W | ≤3.0 |
| Mn | ≤3.0 |
| C | ≤0.01 |
Hastelloy B3 fasteners are nickel-molybdenum alloys containing approximately 28% molybdenum, with controlled additions of chromium, iron and tungsten to enhance thermal stability. The high nickel content provides a stable austenitic matrix, while molybdenum is the primary strengthening element responsible for superior resistance to reducing acid environments. Small amounts of manganese and silicon improve castability and weldability, and low carbon content minimizes carbide precipitation during welding, preserving corrosion resistance in heat-affected zones.
These fasteners deliver outstanding resistance to hydrochloric, sulfuric and other non-oxidizing acids, along with excellent resistance to pitting, crevice corrosion and stress corrosion cracking. Their thermal stability allows reliable performance at elevated temperatures without embrittlement. High tensile and yield strength ensure robust mechanical performance under demanding loads, while resistance to hydrogen embrittlement and chloride-induced cracking makes them ideal for chemical processing, pharmaceutical and pollution-control fastening applications requiring long-term durability.
Specifications
Hastelloy B3 Fasteners are defined by precise dimensional specifications, thread tolerances, and mechanical properties, with technical data covering strength, hardness, and corrosion-resistant performance. Their specification profile supports consistent fit and reliable service in demanding applications while maintaining the alloy’s characteristic stability in aggressive environments.
| Property | Value |
|---|---|
| Tensile Strength | 760–900 MPa |
| Yield Strength (0.2% Offset) | 350–420 MPa |
| Elongation | 40% min |
| Hardness | ≤100 HRB |
| Modulus of Elasticity | 216 GPa |
| Thermal Expansion (20–100°C) | 10.9 µm/m°C |
| Thermal Conductivity | 10.9 W/m·K |
| Density | 9.24 g/cm³ |
| Melting Range | 1330–1380°C |
| Heat Treatment | Solution Annealed at 1065°C, Water Quenched |
| Max Service Temperature | 900°C |
| Standard/Feature | Details |
|---|---|
| Bolt Standard | ASME B18.2.1, DIN 931/933 |
| Stud Bolt Standard | ASME B16.5, MSS SP-75 |
| Nut Standard | ASME B18.2.2, DIN 934 |
| Washer Standard | ASME B18.22.1, DIN 125 |
| Thread Form | UNC, UNF, Metric Coarse/Fine |
| Diameter Range | M6–M100 / 1/4"–4" |
| Length Range | 10mm–500mm (Custom Available) |
| Available Forms | Bolts, Studs, Nuts, Washers, Screws |
| Custom Sizes | Available on Request |
| Manufacturing Standards | ASTM B335, ASME SB335 |
| Inspection Standards | NACE MR0175, PMI, RT, UT Testing |
Applications
