Alloy 90 (UNS N07090 / 2.4632) is a precipitation-hardenable nickel-chromium-cobalt superalloy strengthened by titanium and aluminum additions. The cobalt content (15-21%) provides enhanced creep resistance and stress-rupture strength compared to cobalt-free grades, making it suitable for highly stressed components operating continuously up to 920°C (1688°F). It is the established material for gas turbine blades, discs, and high-temperature springs requiring long-term reliability under sustained loading .
1. Product Specifications & Physical DataZYTC Alloy supplies UNS N07090 in comprehensive mill forms for aerospace, power generation, and industrial applications requiring certified high-temperature properties and complete material traceability. Available Forms: Round bar, flat bar, forging stock, extruded sections, sheet, strip, plate, tube, wire, and welding wire . Specifications: AMS 5829 (wire), BS HR2 (bar/forgings), BS HR202 (sheet/strip), BS HR501/502/503 (spring wire), Werkstoff Nr. 2.4632/2.4969, NACE MR0175/ISO 15156 .
| Chemical Composition (Weight %) | Nimonic 90 Specification |
|---|
| Nickel (Ni) | Balance | | Chromium (Cr) | 18.0 - 21.0 | | Cobalt (Co) | 15.0 - 21.0 | | Titanium (Ti) | 2.0 - 3.0 | | Aluminum (Al) | 1.0 - 2.0 | | Iron (Fe) | 1.5 max. | | Manganese (Mn) | 1.0 max. | | Silicon (Si) | 1.0 max. | | Carbon (C) | 0.13 max. | | Boron (B) | 0.02 max. |
| Physical Properties | Metric | Imperial |
|---|
| Density | 8.18 - 8.19 g/cm³ | 0.296 lb/in³ | | Melting Range | 1370°C | 2500°F | | Modulus of Elasticity (RT) | 213 - 220 GPa | 30.9 - 32.0 × 10⁶ psi | | Thermal Conductivity (RT) | 11.2 - 11.5 W/m·K | 78 - 80 BTU·in/hr·ft²·°F | | Coefficient of Expansion (20-538°C) | 14.8 µm/m·°C | 8.2 µin/in·°F |
| Mechanical Properties (Precipitation Hardened) | Temperature | Metric | Imperial |
|---|
| Tensile Strength | RT | 1080 - 1200 MPa | 157 - 174 ksi | | Yield Strength (0.2% offset) | RT | 695 - 780 MPa | 101 - 113 ksi | | Elongation | RT | 20 - 30% | 20 - 30% | | Tensile Strength | 500°C (932°F) | 995 - 1040 MPa | 144 - 151 ksi | | Yield Strength | 500°C (932°F) | 672 - 740 MPa | 97 - 107 ksi | | Elongation | 500°C (932°F) | 30 - 31% | 30 - 31% |
2.Fabrication & Material ComparisonNimonic® 90 requires precise thermal processing to develop the gamma-prime precipitate structure responsible for its high-temperature strength. Heat Treatment : Bar Products (BS HR2): Solution treat 1080°C (1975°F) × 8 hours, air cool or quench; age 700°C (1290°F) × 16 hours, air cool . Sheet Products (BS HR202): Solution treat 1100-1150°C × 1-10 minutes, rapid quench; age 750°C (1380°F) × 4 hours, air cool (stabilization at 925°C optional per specification) . Wire (Spring Temper + Aged): Age at 650°C (1200°F) × 4 hours or 600°C (1110°F) × 16 hours depending on service temperature requirements .
Welding: Weldable using GTAW (TIG) and GMAW (MIG) processes. Matching filler metal (Nimonic 90 welding wire) required. Pre-weld cleaning essential; post-weld heat treatment necessary to restore aged properties. Precise techniques required to avoid cracking due to high Cr and Co content . Forming & Hot Working: Forging Range: 983-1177°C (1800-2150°F) Hot Working Range: 1050-1200°C (1922-2192°F) Cold Working: Standard tooling applicable; soft die materials and heavy lubricants reduce galling
Machining: Requires powerful equipment, rigid setups, and positive feeds due to high strength. Carbide tooling recommended. Water-based coolants for high-speed operations (turning, milling); heavy lubricants for drilling, tapping, broaching .
Applications Gas Turbine Engines: Turbine blades, discs, rings, combustion components, exhaust reheat assemblies Aerospace: High-temperature fasteners, springs, engine mounts, hot section hardware Power Generation: Steam turbine components, nuclear reactor hardware Automotive: High-performance exhaust valves, turbocharger components Industrial: Hot-work tooling (dies, fixtures), high-temperature springs, extrusion tooling Oil & Gas: High-temperature valves and components for sour service (NACE MR0175 approved)
Contact ZYTC Alloy for certified Alloy 90 (UNS N07090 / 2.4632) materials with complete traceability, AMS/BS specifications, technical datasheets, and competitive pricing on standard sizes or custom-forged components. Email:daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
