ASTM B333 covers plate, sheet, and strip of nickel-molybdenum alloy UNS N10675 (Alloy B-3) for general corrosive service. Alloy B-3 is an improved version of Alloy B-2, offering excellent resistance to pitting, corrosion, and stress-corrosion cracking with significantly enhanced thermal stability. Its distinguishing feature is the ability to maintain excellent ductility during transient exposures to intermediate temperatures—a critical advantage during heat treatments associated with fabrication. This nickel-molybdenum alloy withstands hydrochloric, sulfuric, acetic, formic, and phosphoric acids, as well as other non-oxidizing media .
1. Product Specifications & Physical DataAlloy B-3 is available in plate, sheet, and strip forms for chemical processing equipment requiring superior thermal stability and corrosion resistance. Available Forms: Plate, sheet, strip . Specifications: ASTM B333, ASME SB-333, UNS N10675, Werkstoff Nr. 2.4600 .
| Chemical Composition (Weight %) | UNS N10675 Specification |
|---|
| Nickel (Ni) | Balance (65.0 min.) | | Molybdenum (Mo) | 27.0 - 32.0 | | Iron (Fe) | 1.0 - 3.0 | | Chromium (Cr) | 1.0 - 3.0 | | Tungsten (W) | 3.0 max. | | Cobalt (Co) | 3.0 max. | | Manganese (Mn) | 3.0 max. | | Aluminum (Al) | 0.50 max. | | Carbon (C) | 0.010 max. | | Vanadium (V) | 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 |
| 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. |
2. Fabrication & Material ComparisonSolution Annealing: 1066-1177°C (1950-2150°F), water quench; essential to maintain corrosion resistance . Hot Rolling: Performed at elevated temperatures followed by solution annealing and descaling . Cold Rolling: Sheet and strip produced by hot or cold rolling with intermediate solution annealing . Forming: Good ductility permits forming; material should be in annealed condition . Machining: Requires slow speeds, positive feeds, and adequate coolant; work-hardening rate moderate . Welding: Excellent weldability using GTAW and GMAW; matching filler metal recommended; no post-weld heat treatment required .
| Material Comparison | Alloy B-3 | Alloy B-2 | Alloy C-276 | Alloy C-22 |
|---|
| Molybdenum Content | 27-32% | 26-30% | 15-17% | 12.5-14.5% | | Thermal Stability | Superior | Moderate | Excellent | Excellent | | Hydrochloric Acid | Excellent | Excellent | Good | Good | | Oxidizing Acid | Poor | Poor | Excellent | Excellent | | Knife-Line Attack | Excellent | Moderate | Excellent | Excellent | | Intermediate Temp Ductility | Maintained | Reduced | Maintained | Maintained | | Primary Use | Reducing acids | Reducing acids | Mixed environments | Mixed environments |
3. ApplicationsChemical Processes: Reactors, vessels, and columns for hydrochloric, sulfuric, and phosphoric acid service Vacuum Furnaces: Components requiring thermal stability during high-temperature processing Mechanical Components: Parts operating in reducing environments requiring fabrication heat treatment Piping Systems: Pipe work and fittings for non-oxidizing acid service Heat Exchangers: Equipment handling reducing acid streams Welded Fabrications: Components requiring resistance to knife-line and HAZ attack
Contact ZYTC Alloy for certified ASTM B333 UNS N10675 (Alloy B-3) plate, sheet, and strip with complete traceability, certificates, and competitive pricing. Available in solution-annealed condition for chemical processing and reducing acid service applications requiring superior thermal stability. Email:daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
