Alloy 242 (UNS N10242) is a nickel-molybdenum-chromium alloy strengthened through a unique long-range ordering (LRO) mechanism rather than conventional precipitation hardening . Upon aging, it forms Ni₂(Mo,Cr) domains that deliver tensile and creep strength up to 1300°F (705°C) approximately double that of solid-solution strengthened alloys, while maintaining excellent ductility and low thermal expansion characteristics .
1. Product Specifications & Physical DataZYTC Alloy supplies UNS N10242 in mill forms suitable for gas turbine static components, chemical processing equipment, and aerospace applications requiring verified high-temperature properties and complete material traceability. Available Forms: Billet, bar, plate, sheet, strip, wire welding products, and custom forgings . Specifications: ASTM B434, AMS 5726, AWS A5.14 ERNiMo-12, UNS N10242 .
| Chemical Composition (Weight %) | Haynes® 242 Specification |
|---|
| Nickel (Ni) | Balance | | Molybdenum (Mo) | 24.0 - 26.0 | | Chromium (Cr) | 7.0 - 9.0 | | Iron (Fe) | 2.0 max. | | Cobalt (Co) | 2.5 max. | | Manganese (Mn) | 0.8 max. | | Silicon (Si) | 0.8 max. | | Aluminum (Al) | 0.5 max. | | Carbon (C) | 0.03 max. | | Boron (B) | 0.006 max. | | Copper (Cu) | 0.5 max. |
| Physical Properties | Metric | Imperial |
|---|
| Density | 9.05 - 9.06 g/cm³ | 0.327 lb/in³ | | Modulus of Elasticity (RT) | 229 GPa | 33.2 × 10⁶ psi | | Thermal Conductivity (RT) | 11.3 W/m·K | 75.7 BTU·in/hr·ft²·°F | | Mean CTE (70-1000°F) | 12.2 µm/m·°C | 6.8 µin/in·°F |
| Mechanical Properties (Aged Plate) | Metric | Imperial |
|---|
| Tensile Strength (RT) | 1270 MPa | 184 ksi | | Yield Strength (RT, 0.2% offset) | 780 MPa | 113 ksi | | Elongation (RT) | 38% | 38% | | Tensile Strength (650°C/1200°F) | 945 MPa | 137 ksi | | Yield Strength (650°C/1200°F) | 525 MPa | 76 ksi |
2. Fabrication & Material ComparisonAlloy 242 (UNS N10242) offers good fabricability in the annealed condition, distinguishing it from many high-strength superalloys that sacrifice workability for performance. Heat Treatment : Solution Annealing: 1038-1121°C (1900-2050°F), air cool; water quench recommended for heavy sections Aging: 650°C (1200°F) × 24-48 hours, air cool
Welding: Excellent weldability using GTAW and GMAW processes with matching composition filler metal (ERNiMo-12). High heat input methods not recommended. Pre-weld cleaning essential; post-weld aging required to restore properties . Forming: Good hot and cold formability in annealed condition; intermediate anneals may be required for severe deformation . Machining: Machinability similar to other high-strength nickel alloys; carbide tooling recommended with positive rake angles . Material Comparison : vs. Solid-Solution Alloys (Hastelloy X, 625): Twice the tensile and creep strength up to 705°C; significantly lower thermal expansion vs. Haynes 230: Lower maximum use temperature but higher strength in intermediate range; better fluorine resistance vs. Haynes 244: 244 represents next-generation upgrade with 55-110°C higher use temperature and lower CTE vs. Low-Expansion Alloys (909): Better oxidation resistance without need for coatings; higher strength above 540°C
Applications Aerospace & Gas Turbines: Seal rings, containment rings, duct segments, casings, fasteners, rocket nozzle assemblies Chemical Processing: Fluoroelastomer extrusion screws and cylinders, HF acid processing equipment, high-temperature fluoride environment components Industrial: Pump components, springs, high-temperature fasteners
Contact ZYTC Alloy for certified Alloy 242 materials with complete traceability, technical datasheets, and competitive pricing on standard sizes or custom-fabricated components. Email:daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
