Alloy 244 is a precipitation-hardenable nickel-molybdenum-chromium-tungsten alloy specifically engineered for gas turbine static components requiring controlled thermal expansion and high strength up to 760°C (1400°F). It represents an advancement over earlier low-expansion alloys, offering a 55-110°C (100-200°F) higher maximum use temperature than predecessor grades through optimized tungsten alloying that enhances domain stability and lowers the coefficient of thermal expansion .
1. Product Specifications & Physical DataZYTC Alloy supplies UNS N06230 in mill forms suitable for aerospace seal rings, casings, and containment components requiring verified low-expansion properties and high-temperature strength. Available Forms: Plate, sheet, strip, foil, billet, bar, wire, and welding products . Specifications: UNS N06230, developed by Haynes International .
| Chemical Composition (Weight %) | Haynes® 244 Specification |
|---|
| Nickel (Ni) | Balance | | Molybdenum (Mo) | 22.5 | | Chromium (Cr) | 8.0 | | Tungsten (W) | 6.0 | | Iron (Fe) | 2.0 max. | | Manganese (Mn) | 0.8 max. | | Aluminum (Al) | 0.5 max. | | Carbon (C) | 0.03 max. |
| Physical Properties | Metric | Imperial |
|---|
| Density | Data Pending | Data Pending |
| Mechanical Properties (Age-Hardened Plate) | Metric | Imperial |
|---|
| Tensile Strength (RT) | 1345 MPa | 195.0 ksi | | Yield Strength (RT, 0.2% offset) | 836 MPa | 121.2 ksi | | Elongation (RT) | 34% | 34% | | Tensile Strength (760°C/1400°F) | 696 MPa | 105.0 ksi | | Yield Strength (760°C/1400°F) | 463 MPa | 67.2 ksi |
2. Fabrication & Material ComparisonHaynes® 244 requires specific thermal processing to develop the ordered domain structure responsible for its unique combination of low expansion and high strength. Welding: Suitable for gas tungsten arc (GTAW) and gas metal arc (GMAW) processes. High heat input methods such as submerged arc and oxyacetylene welding are not recommended . Pre-weld cleaning essential; interpass temperature should be maintained below 200°F (95°C); preheat not required . Post-Weld Heat Treatment: Following forming and welding, a full solution anneal is recommended prior to aging to develop optimal joint and mechanical properties. Typically used in fully-aged condition for service . Heat Treatment: Annealing: 2000-2100°F (1093-1149°C) with air cooling; water quench recommended for heavy sections . Precision Aging: 1400°F (760°C) × 16 hours, furnace cool to 1200°F (649°C) × 32 hours, air cool . This controlled thermal cycle ensures optimal domain formation and distribution.
Material Comparison: vs. Haynes 242: 100-200°F higher maximum use temperature; improved thermal stability through tungsten additions; comparable oxidation resistance . vs. Waspaloy: Evaluated for low-cycle fatigue performance in turbine case applications; specific comparative advantages detailed in ASME Turbo Expo 2021 paper . vs. Gamma-Prime Strengthened Alloys: Different coarsening behavior during creep—variant coarsening in 244 does not significantly impact mechanical properties, unlike rafting in gamma-prime alloys which can negatively affect creep performance .
Applications Gas turbine engine static components: seal rings, cases, containment rings Advanced aerospace structural components requiring thermal stability High-precision instrumentation Industrial equipment operating in elevated temperature environments
Contact ZYTC Alloy for certified alloy 244 materials with complete traceability, technical datasheets, and competitive pricing on standard sizes or custom-fabricated components. Email:daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
