Alloy 233 is a next-generation nickel-cobalt-chromium-molybdenum-aluminum superalloy that bridges the performance gap between high-creep-strength alloys and ultra-high-oxidation-resistant alloys. By forming a protective alumina (Al₂O₃) scale rather than chromia, it achieves oxidation resistance comparable to Haynes 214 while maintaining creep strength approaching Haynes 230 up to 1149°C (2100°F). Additionally, it can be age-hardened for enhanced strength at intermediate temperatures
1. Product Specifications & Physical DataZYTC Alloy supplies UNS N06233 in mill forms suitable for aerospace combustion hardware, industrial heating fixtures, and advanced energy systems requiring certified high-temperature properties. Available Forms: Plate, sheet, strip, foil, billet, bar, wire, and welding products. Specifications: UNS N06233, Werkstoff Nr. 2.4683 (pending) .
| Chemical Composition (Weight %) | Haynes® 233 Specification |
|---|
| Nickel (Ni) | 48 (Balance) | | Chromium (Cr) | 18.0 - 20.0 | | Cobalt (Co) | 18.0 - 20.0 | | Molybdenum (Mo) | 7.0 - 8.0 | | Aluminum (Al) | 3.0 - 3.5 | | Titanium (Ti) | 0.40 - 0.60 | | Tantalum (Ta) | 0.40 - 0.80 | | Carbon (C) | 0.05 - 0.12 | | Iron (Fe) | ≤ 1.50 | | Manganese (Mn) | 0.10 - 0.40 | | Silicon (Si) | 0.04 - 0.20 | | Boron (B) | ≤ 0.006 | | Yttrium (Y) | ≤ 0.025 |
| Physical Properties | Metric | Imperial |
|---|
| Density | 8.18 - 8.18 g/cm³ | 0.296 lb/in³ | | Melting Range | 1328 - 1389°C | 2422 - 2532°F | | Gamma-Prime Solvus | 964°C | 1767°F |
| Mechanical Properties | Condition | Metric | Imperial |
|---|
| Tensile Strength (RT) | Annealed | 965 MPa | 140 ksi | | Yield Strength (RT) | Annealed | Not listed* | Not listed* | | Tensile Strength (RT) | Age-Hardened | 1172 MPa | 170 ksi | | Yield Strength (RT) | Age-Hardened | 778 MPa | 112.9 ksi | | Elongation (RT) | Age-Hardened | 27.3% | 27.3% | | Tensile Strength (649°C) | Age-Hardened | 1079 MPa | 156.6 ksi | | Yield Strength (649°C) | Age-Hardened | 658 MPa | 95.5 ksi |
2. Operating Conditions & Selection BoundariesThis alloy was specifically developed to combine the oxidation resistance of Haynes® 214 with the creep strength of Haynes® 230, addressing a long-standing performance gap in high-temperature materials . Oxidation Resistance: Designed for sustained use up to 2100°F (1149°C). Forms a stable, adherent Al₂O₃ scale that remains protective in high-velocity combustion atmospheres. Static oxidation testing at 2100°F for 1008 hours shows metal loss of only 0.2 mils/side, comparable to Haynes® 214 and significantly better than Haynes® 230 or alloy 617 . Dual Heat Treatment Capability: Solution Annealed (2125-2150°F / 1163-1177°C): Recommended for service above the gamma-prime solvus (1767°F / 964°C) . Age Hardened (1650°F/4h/AC + 1450°F/8h/AC): Provides significant strength increase for low-to-intermediate temperature applications below the solvus .
Fabricability: Can be formed and welded using conventional methods. Exhibits good hot workability, cold formability, and weldability—unusual for an alumina-forming alloy . Critical Constraint: Service in the solution-annealed condition at temperatures below 1767°F will result in gamma-prime precipitation, which must be accounted for in design .
Applications Aerospace & Gas Turbines: Combustion cans, transition ducts, flame holders, afterburner components, hot gas path hardware Industrial Heating: High-temperature fixtures, sensors, thermocouple sheaths, burner components Power Generation: Structural components for advanced energy systems, supercritical CO₂ cycles Chemical Processing: High-temperature reactor internals, catalyst support systems Electronics: High-temperature sensors and instrumentation
Contact ZYTC Alloy for certified alloy 233 materials with complete traceability, technical datasheets, and competitive pricing on standard sizes or custom-fabricated components. Email:daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
