Haynes 282 is a nickel-based superalloy with excellent creep strength, thermal stability, and oxidation resistance at very high temperatures. It is mainly used in gas turbines, combustion systems, and other hot-section components.
Inconel 718 is a precipitation-hardened nickel alloy with high strength, good fatigue resistance, and excellent weldability. It is widely used in aircraft engines, turbines, and high-stress industrial components.
A gamma-prime-strengthened nickel-based superalloy offering excellent high-temperature strength, creep resistance, thermal stability and weldability, widely used in gas turbines, combustors, transition ducts and other hot-section components.
View Haynes 282A precipitation-hardenable nickel-chromium-iron superalloy combining high strength, good fatigue resistance and reliable performance at elevated temperatures, widely used in aircraft engines, gas turbines, rocket components and high-performance fasteners.
View Inconel 718Review the key differences before confirming chemical media, product form, standard, certificate and delivery schedule.
| Comparison Item | Haynes 282 | Inconel 718 | Selection Note |
|---|---|---|---|
| Basic Information | |||
| UNS Number | N07208 | N07718 | Use the UNS number on drawings, MTCs and purchase specifications. |
| Alloy Type | Nickel-chromium-cobalt-molybdenum superalloy | Nickel-chromium-iron-niobium-molybdenum superalloy | 282 is designed for high-temperature creep strength; 718 provides very high strength at moderate temperatures. |
| Strengthening Method | Gamma-prime precipitation hardened | Primarily gamma-double-prime precipitation hardened | Both require controlled solution and aging treatments to develop their intended properties. |
| Typical Product Forms | Sheet, plate, bar, wire, forgings and rings | Sheet, plate, bar, wire, forgings, rings and fasteners | 718 generally has broader global availability and a larger range of established specifications. |
| Chemical Composition | |||
| Nickel (Ni) | Balance, approximately 57% | 50.0–55.0% | Both have nickel-rich matrices that support high-temperature stability. |
| Chromium (Cr) | Approximately 19.5% | 17.0–21.0% | Chromium provides oxidation and hot-corrosion resistance in both alloys. |
| Cobalt (Co) | Approximately 10.0% | 1.0% max | The substantial cobalt addition in 282 supports high-temperature strength and microstructural stability. |
| Molybdenum (Mo) | Approximately 8.5% | 2.8–3.3% | The higher molybdenum content of 282 contributes to solid-solution strengthening. |
| Niobium + Tantalum (Nb + Ta) | Not intentionally added | 4.75–5.50% | Niobium is central to the precipitation-hardening response of 718. |
| Titanium (Ti) | Approximately 2.1% | 0.65–1.15% | Titanium promotes gamma-prime strengthening, particularly in 282. |
| Aluminum (Al) | Approximately 1.5% | 0.20–0.80% | The aluminum and titanium combination gives 282 its gamma-prime strengthening phase. |
| Iron (Fe) | 1.5% max | Balance | 718 contains considerably more iron, while 282 has a more highly alloyed nickel base. |
| Carbon (C) | Approximately 0.06% | 0.08% max | Carbon contributes to carbide formation; final limits must follow the applicable specification. |
| Mechanical Properties | |||
| Typical Condition | Solution treated and two-step aged | Solution treated and precipitation hardened | Mechanical values depend strongly on product form, section size and heat-treatment cycle. |
| Yield Strength, RT | Approx. 720 MPa | Approx. 1,035 MPa | Age-hardened 718 generally has higher room-temperature yield strength. |
| Tensile Strength, RT | Approx. 1,150 MPa | Approx. 1,275 MPa | 718 typically provides higher room-temperature tensile strength. |
| Elongation, RT | Approx. 25–30% | Approx. 12–20% | 282 can retain greater tensile ductility, depending on form and heat treatment. |
| Creep Strength | Excellent at temperatures up to approximately 900°C | Excellent up to approximately 650°C | 282 offers a major advantage in long-duration, high-temperature creep service. |
| Thermal Stability | Excellent long-term microstructural stability | Good, but strengthening phases become less stable at higher temperatures | 282 is better suited to prolonged exposure above the normal operating range of 718. |
| Weldability | Good for a gamma-prime-strengthened superalloy | Good with established qualified procedures | 282 was designed to combine high creep strength with practical fabrication and weldability. |
| Temperature Performance | |||
| Typical Service Range | High-strength service up to approximately 900°C | High-strength service up to approximately 650°C | Actual allowable temperature depends on stress, exposure time, environment and design code. |
| Oxidation Resistance | Excellent at elevated temperatures | Good to excellent at moderate elevated temperatures | 282 is generally preferred for longer exposure at higher temperatures. |
| Stress-Rupture Performance | Superior at temperatures above the practical range of 718 | Excellent at intermediate temperatures | Compare project-specific stress-rupture curves at the intended temperature and design life. |
| Price Comparison | |||
| Relative Material Cost | Higher | High | 282 commonly costs more because of cobalt content, production volume and more limited availability. |
| Stock Availability | Available, but some forms and sizes may require special production | Widely available in common aerospace and industrial forms | 718 is generally easier to source for urgent requirements and smaller quantities. |
| Processing Cost | High due to controlled heat treatment and difficult machining | High due to heat treatment and difficult machining | Include forging, machining, heat treatment, testing and scrap allowance in the total cost. |
| Quotation Factors | Form, size, quantity, specification, heat treatment, testing and cobalt price | Form, size, quantity, specification, heat treatment, testing and aerospace approvals | Final pricing should be based on the actual drawing, certification and delivery requirements. |
| Performance & Application | |||
| Primary Advantage | High creep strength and thermal stability at very high temperatures | Exceptional tensile, fatigue and yield strength at moderate temperatures | The required operating temperature is usually the decisive selection factor. |
| Corrosion Resistance | Good oxidation and hot-corrosion resistance | Good general corrosion and oxidation resistance | Neither alloy should be selected for aggressive chemical service without medium-specific corrosion data. |
| Typical Applications | Gas-turbine combustors, transition ducts, turbine casings, exhaust components and high-temperature fasteners | Turbine disks, shafts, compressor parts, aerospace fasteners, rocket components and oilfield equipment | 282 is common in hotter static structures; 718 is widely used in highly loaded rotating and structural parts. |
| Best Use Case | Long-duration service requiring creep strength near 750–900°C | High-load service requiring maximum strength up to approximately 650°C | Select 282 for higher-temperature capability and 718 for established, cost-effective strength at moderate temperatures. |
Values are typical references for article comparison. Final supply should follow the ordered standard, product form, heat treatment, mill test certificate and project requirements.
English English 
French
German
Italian
Spanish
Portuguese
Arabic
Korean