HASTELLOY B2 FASTENERS | ULTIMATE GUIDE & MANUFACTURER
Ananka Fasteners is a premier manufacturer and supplier of high-quality Hastelloy B2 Fasteners (UNS N10665 / W.Nr. 2.4617). Engineered as a premier solid solution strengthened, nickel-molybdenum alloy, B2 offers unmatched resistance to highly reducing environments—most notably boiling hydrochloric and sulfuric acids—making it the ultimate fastening solution where standard stainless steels and chromium-rich alloys fail.
■ Complete Range of Hastelloy B2 Fasteners
As a master manufacturer, we produce a comprehensive range of Alloy B2 fasteners spanning from standard M3 hardware to massive M100 structural ties.
| Bolts & Screws | Nuts & Washers | Studs & Rods |
|---|---|---|
| Standard Hex Bolts / Heavy Hex Bolts | Standard Hex Nuts (DIN 934) | Fully Threaded Studs (DIN 976) |
| Socket Head Cap Screws | Flat Washers (DIN 125) | Double Ended Studs |
| Anchor Bolts / U-Bolts | Spring Washers | Threaded Rods / Tie Rods |
| Countersunk Screws / Set Screws | Heavy Hex Nuts | Custom Machined Studs |
■ Standard Product Pages
Explore our dedicated standard pages for specific fastener categories to view detailed dimensions, availability, and specific technical data:
- Hastelloy B2 Bolts: Comprehensive range of heavy hex, socket cap, and anchor configurations.
- Hastelloy B2 Nuts: View our dedicated page for standard hex, heavy hex, and precision-machined nuts.
- Hastelloy B2 Studs: Fully threaded and double-ended studs for highly reducing high-pressure joints.
- Hastelloy B2 Washers: High-performance plain, lock, and spring washers for secure fastening in corrosive environments.
- Chemical Processing: Exclusive reliance for reactors, heat exchangers, and distillation columns handling pure hydrochloric, sulfuric, and phosphoric acids.
- Pharmaceutical Production: Securing pharmaceutical reactors and complex piping systems synthesizing APIs using harsh reducing chemicals, ensuring zero metallic contamination.
- Vacuum Furnaces & Mechanical Components: High-temperature vacuum or inert gas environments where oxidation is not a threat, but high structural strength is required up to 815°C (1500°F).
■ Hastelloy B2 Material Specifications
| Material Equivalent Grades | UNS N10665 | W.Nr. 2.4617 | Alloy B2 | NiMo28 | AFNOR NU-30M |
|---|---|
| Standard Specifications | ASTM F468 / ASME SF468 (Nonferrous Bolts & Studs) ASTM B335 / ASME SB335 (Rod & Bar Stock) |
| Size Range | Metric: M3 to M100 (M56 commonly stocked) | Imperial: 3/16" to 4" |
| Thread Types | UNC, UNF, Metric Coarse, Metric Fine, BSW, BSF |
| Dimensional Standards | DIN (931/933/912/934/976), ISO, ASME |
■ Chemical Composition of Alloy B2
| Ni (Nickel) | Mo (Molybdenum) | Fe (Iron) | Cr (Chromium) | Co (Cobalt) | Mn (Manganese) | Si (Silicon) | C (Carbon) |
|---|---|---|---|---|---|---|---|
| 69.0% Bal | 26.0 - 30.0% | 2.00% Max | 1.00% Max | 1.00% Max | 1.00% Max | 0.10% Max | 0.02% Max |
■ Mechanical & Physical Properties
| Tensile Strength (Min) | Yield Strength 0.2% Offset (Min) | Elongation (%) | Density | Melting Range |
|---|---|---|---|---|
| 760 MPa (110 ksi) | 350 MPa (51 ksi) | 40% Min | 9.22 g/cm³ | 1300 - 1380°C |
■ Installation Tribology & Corrosion Profile
Installation: Nickel-molybdenum superalloys exhibit a high propensity to gall (cold weld) during installation. The application of engineered, nickel-compatible anti-seize lubricants is strictly mandatory during joint assembly to ensure accurate torque-to-tension conversion.
Corrosion Vulnerability Warning: Because Alloy B2 intentionally restricts Chromium (1.00% Max) to maximize performance in reducing acids, it cannot form a robust passive oxide layer. Hastelloy B2 fasteners should never be used in oxidizing environments or in the presence of oxidizing salts (such as ferric or cupric chloride), as they will suffer premature failure.
■ Key Characteristics & Industrial Applications
Hastelloy B2 is completely unmatched in its resistance to pure hydrochloric acid at all concentrations and temperatures, making it a critical asset in specific harsh environments.