ASTM B333 covers plate, sheet, and strip of nickel-molybdenum alloy UNS N10665 (Alloy B-2) for use in general corrosive service. This solid-solution strengthened nickel alloy is specifically designed for extreme reducing conditions, offering exceptional resistance to hydrogen chloride, sulfuric acid, phosphoric acid, and other non-oxidizing acids. With a high molybdenum content (26-30%), Alloy B-2 maintains excellent corrosion resistance in as-welded condition without risk of intergranular attack.
1. Product Specifications & Physical DataAlloy B-2 is available in plate, sheet, and strip forms for chemical processing equipment requiring verified corrosion resistance and mechanical properties. Available Forms: Plate, sheet, strip . Specifications: ASTM B333, ASME SB-333, UNS N10665, Werkstoff Nr. 2.4617 .
| Chemical Composition (Weight %) | UNS N10665 Specification |
|---|
| Nickel (Ni) | Balance (65.0 min.) | | Molybdenum (Mo) | 26.0 - 30.0 | | Iron (Fe) | 2.0 max. | | Chromium (Cr) | 1.0 max. | | Cobalt (Co) | 1.0 max. | | Manganese (Mn) | 1.0 max. | | Silicon (Si) | 0.10 max. | | Carbon (C) | 0.02 max. | | Vanadium (V) | 0.20 max. | | Tungsten (W) | 0.20 max. |
| Physical Properties | Metric | Imperial |
|---|
| Density | 9.22 g/cm³ | 0.333 lb/in³ | | Melting Range | 1332 - 1382°C | 2430 - 2520°F | | Modulus of Elasticity (RT) | 217 GPa | 31.5 × 10⁶ psi | | Specific Heat Capacity | 377 J/kg·°C | 0.090 BTU/lb·°F | | Electrical Resistivity | 1.37 µΩ·m | 1.37 µΩ·m |
| Mechanical Properties (Annealed Plate) | Metric | Imperial |
|---|
| Tensile Strength (min.) | 760 MPa | 110 ksi | | Yield Strength (0.2% offset, min.) | 350 MPa | 51 ksi | | Elongation (min.) | 40% | 40% | | Hardness (Rockwell B) | 100 max. | 100 max. | | Grain Size (ASTM) | 5.0 finer | 5.0 finer |
2. Operating Conditions & Selection CriteriaService Temperature: Up to 400°C (752°F) Acid Resistance: Excellent in hydrochloric, sulfuric, and phosphoric acids As-Welded: Maintains corrosion resistance without post-weld heat treatment Limitation: Not suitable for oxidizing media or ferric/cupric ions
3. Fabrication & Material ComparisonSolution Annealing: 1066-1177°C, water quench Welding: Good weldability with matching filler; no post-weld heat treatment required Forming: Good ductility in annealed condition
| Comparison | Alloy B-2 | Alloy C-276 | Alloy B-3 |
|---|
| Molybdenum | 26-30% | 15-17% | 28-30% | | Reducing Acid Resistance | Excellent | Good | Excellent | | Oxidizing Acid Resistance | Poor | Excellent | Poor | | As-Welded | Good | Excellent | Superior |
4. ApplicationsPressure vessels, reactors for HCl/H₂SO₄ service Pipe work, heat exchangers, pumps, valves Agitators, gaskets, FGD components
Contact ZYTC Alloy for certified ASTM B333 UNS N10665 plate, sheet, and strip with certificates and full traceability. Email:daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
