Hastelloy B2 Fasteners (UNS N10665)
Ananka Fasteners is a premier manufacturer and supplier of specialized Hastelloy B2 Fasteners (W.Nr. 2.4617). Manufactured in compliance with official Haynes International Standards, Alloy B2 offers outstanding resistance to pure hydrochloric, sulfuric, and phosphoric acids, making it the definitive choice for severe chemical processing.
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■ Hastelloy Alloy Selection Grid
To assist procurement managers and engineers, use our technical grid below to compare the performance profiles of our primary Hastelloy grades. Click the specific grade for its dedicated specification page.
| Grade / Anchor Link | Yield Strength (Min) | Key Chemical Resistance | Primary Application |
|---|---|---|---|
| Hastelloy C276 Fasteners | 41 ksi (283 MPa) | Wet chlorine, hypochlorite, sulfur compounds | Flue Gas Desulfurization (FGD), Chemical Processing |
| Hastelloy C22 Fasteners | 45 ksi (310 MPa) | Outstanding overall resistance to localized corrosion | Pharmaceuticals, Fine Chemicals |
| Hastelloy B2 Fasteners | 51 ksi (350 MPa) | Pure sulfuric, phosphoric & hydrochloric acids | Reducing environments, Acid Production |
| Hastelloy B3 Fasteners | 51 ksi (350 MPa) | Hydrochloric acid at all temps/concentrations | High-temperature acidic processes (improved thermal stability) |
■ Complete Range of Hastelloy B2 Fasteners
We manufacture a comprehensive range of Alloy B2 fasteners engineered to survive severe reducing chemical environments without degrading.
| Bolts & Screws | Nuts & Washers | Studs & Rods |
|---|---|---|
| Hex Bolts / Heavy Hex Bolts | Hex Nuts / Heavy Hex Nuts | Fully Threaded Studs |
| Socket Head Cap Screws | Flange Nuts / Lock Nuts | Double Ended Studs |
| Flange Bolts / 12-Point Bolts | Flat Washers / Spring Washers | Custom CNC Machined Studs |
■ Mechanical Properties & Yield Strength
Hastelloy B2 Fasteners derive their strength and distinct corrosion resistance from a high molybdenum content (~28%) mixed with nickel, virtually eliminating carbon to prevent intergranular carbide precipitation. Below are the standard mechanical properties:
| Tensile Strength (Min) | Yield Strength 0.2% Offset (Min) | Elongation (%) | Density |
|---|---|---|---|
| 110 ksi (760 MPa) | 51 ksi (350 MPa) | 40% Min | 9.22 g/cm³ |
■ Reducing Environments & Acid Production Applications
Crucial Engineering Note: Hastelloy B2 Fasteners have poor corrosion resistance in oxidizing environments. They should strictly not be used where oxidizing media (such as cupric or ferric salts) are present, as these cause rapid premature failure.
- Acid Production: Fasteners for piping, valves, and reactors handling pure hydrochloric acid at all concentrations and temperatures up to the boiling point.
- Chemical Synthesis: Equipment utilized in the production of acetic acid, acetic anhydride, and ethylbenzene.
- Petrochemicals: Fasteners in alkylation units handling sulfuric acid and hydrogen chloride gas.
- Isomerization: Catalyst handling equipment and process heaters requiring extreme resistance to reducing media.
■ Quality Assurance & MTC Downloads
As a primary manufacturer based in Mumbai, our quality control goes beyond standard chemical analysis. We conduct rigorous first-hand testing on all Hastelloy B2 Fasteners to ensure they meet the stringent safety requirements of EPC contractors and chemical process engineers.
- Ultrasonic Testing (UT): Internal flaw detection performed on raw billets prior to machining.
- Destructive Testing: In-house tensile, yield, and elongation testing to verify structural integrity.
- PMI (Positive Material Identification): 100% optical emission spectroscopy scanning prior to dispatch to guarantee the precise high-molybdenum content required for reducing acid resistance.
📄 Download Sample EN 10204:3.1 MTC (PDF)
