Inconel 718 (UNS N07718) is the global work‑horse precipitation‑hardened superalloy widely adopted for high‑stress aerospace, gas‑turbine and power‑generation components. Its γ″ strengthening phase delivers outstanding tensile and fatigue performance below 650 °C, but suffers rapid phase degradation for long‑term service above 650 °C.
When component operating temperatures cross the 650 °C threshold, engineers frequently evaluate two mainstream Haynes alternatives: Haynes 230 (UNS N06230) solid‑solution nickel‑base alloy and Haynes 282 (UNS N07208) gamma‑prime strengthened wrought superalloy.
These three alloys are NOT drop‑in interchangeable. Differences in strengthening mechanism, creep‑rupture capability, welding behavior, mandatory heat‑treatment and cost frequently lead to prototype failure if mis‑specified. This guide addresses buyers' top‑of‑mind concerns: temperature boundaries, load suitability, manufacturability, and whether one alloy can safely replace another.
Fast cross‑links to dedicated product pages:Haynes 230 Alloy (UNS N06230) | High‑Temperature Nickel Alloy for Gas Turbine, Industrial Heating & Chemical Processing |Haynes 282 Alloy (UNS N07208) | Gamma‑Prime Strengthened Nickel Superalloy for Gas Turbine & A‑USC Applications
Also read our full Haynes‑series overview:Haynes High‑Temperature Superalloys Comparison: Similarities, Key Differences & Buyer Selection Guide
Core Buyer Concerns Summary
Below are the most frequent questions from material engineers, design teams and procurement:
- What is the hard temperature limit for each alloy for continuous long‑term service?
- Which alloy handles sustained creep‑loaded components vs static low‑stress hardware?
- What are welding risks and post‑weld requirements?
- Which heat‑treatment steps are mandatory to achieve rated mechanical performance?
- Under what conditions can I substitute one alloy for another?
- What common specification mistakes cause prototype or field failure?
Haynes 230 vs Haynes 282 vs Inconel 718 at a Glance
| Alloy | Main Strength | Typical Temperature Focus | Key Selection Factor | Typical Applications |
|---|---|---|---|---|
| Haynes 230 | High-temperature strength and oxidation resistance | Long-term high-temperature service | Oxidation resistance + thermal stability | Gas turbines, combustion components, furnace and high-temperature equipment |
| Haynes 282 | Creep strength and structural performance | 1200–1700°F (649–927°C) creep applications | Creep strength + fabricability | Gas turbine structural parts, cases, rings, exhaust/nozzle components, A-USC |
| Inconel 718 | High strength and good fabrication characteristics | Up to about 1200°F (650°C) | Strength at lower high-temperature ranges | Aerospace, gas turbines, fasteners and high-strength components |
The three alloys should not be treated as direct substitutes in every application. Their useful temperature ranges and primary performance advantages are different.
For detailed specifications, see our Haynes 230 alloy for oxidation resistance and weldability, Haynes 282 alloy for creep strength and HCl corrosion resistance, and Inconel 718 alloy for maximum strength below 650°C.
Haynes 230 vs 282 vs 718: Quick Buyer Guide
| Application Requirement | Alloy to Evaluate |
|---|---|
| High-temperature oxidation resistance | Haynes 230 |
| Long-term exposure to hot oxidizing gases | Haynes 230 |
| Gas turbine hot-section components | Haynes 230 / Haynes 282 |
| High-temperature structural components | Haynes 282 |
| Creep-controlled applications | Haynes 282 |
| Service around or below 1200°F / 650°C | Inconel 718 / 718-family alloys |
| Higher-temperature structural alternative to 718 | Haynes 282 |
| Complex fabricated high-temperature components | Haynes 230 / Haynes 282 / 718, depending on design |
This table is a screening guide rather than a substitute for a component-specific material evaluation.
Costly Real‑World Selection Pitfalls to Avoid
Pitfall 1: Using Inconel 718 for long‑term service above 670 °C
Risk: γ″ precipitates over‑age; creep resistance drops sharply leading to premature component deformation or cracking. Fix: Shift evaluation to Haynes 230 or Haynes 282 once continuous temperature exceeds 650 °C.
Pitfall 2: Specify Haynes 230 for rotating high‑stress parts originally designed for Inconel 718
Risk: Haynes 230 is solid‑solution strengthened and cannot match Inconel 718's fatigue and tensile strength under heavy mechanical load. Fix: Haynes 230 is intended for static hardware only. Re‑design wall‑thickness if you must substitute.
Pitfall 3: Expect full rated creep performance from as‑welded Haynes 282 without age‑hardening
Risk: Solution‑annealed Haynes 282 has good ductility for forming, but delivers far‑below‑spec creep strength without post‑fabrication age‑hardening. Fix: Confirm heat‑treatment capacity at your workshop before finalising Haynes 282 on drawing.
Pitfall 4: Purchase material only by trade‑name without UNS number, AMS specification and heat‑treatment state
Risk: Material arrives in wrong metallurgical condition and fails prototype testing. Fix: Always add UNS designation, AMS spec, product form and required heat‑treatment status to RFQ and purchase order; request matching heat‑number Mill Test Report (MTR).
Haynes 230 vs Haynes 282 vs Inconel 718: Final Selection Framework
There is no single high-temperature alloy that is optimal for every application.
- Haynes 230 is primarily attractive when oxidation resistance, high-temperature strength and long-term thermal stability are important.
- Haynes 282 is primarily attractive when creep strength and high-temperature structural performance are the main requirements.
- Inconel 718 remains an important high-strength nickel alloy for applications around or below 1200°F (650°C), subject to the actual design requirements and specification.
For engineers comparing Haynes 230 vs 718, the key questions are oxidation resistance, temperature, environment and long-term stability.
For engineers comparing Haynes 282 vs 718, the key questions are service temperature, creep strength, structural loading and fabrication requirements.
For projects comparing Haynes 230 vs Haynes 282, the decision is often driven by whether oxidation resistance or creep-controlled structural performance is the dominant requirement.
If you are unsure which alloy fits your application, send us the operating temperature, product form, dimensions, service environment and required specification. We can help identify the appropriate Haynes alloy and supply form.
Application Mapping
- Inconel 718: Turbine disks, compressor wheels, high‑strength fasteners, cryogenic components, high‑stress structural hardware operating ≤650 °C.
- Haynes 230: Static gas‑turbine combustor liners, furnace baskets, thermocouple sheaths, nitriding‑furnace fixtures, high‑temperature chemical ducting.
- Haynes 282: Weld‑intensive gas‑turbine hot‑section assemblies, transition ducts, A‑USC advanced‑ultra‑supercritical boiler, header and valve components working from 649 °C‑927 °C.
Not sure whether Inconel 718, Haynes 230 or Haynes 282 fits your project?
Submit your key operating parameters: continuous peak service temperature, mechanical‑load type, working‑gas atmosphere, available heat‑treatment capability and target application (gas‑turbine / A‑USC power‑plant / industrial furnace). Our superalloy technical‑sales team will provide alloy‑selection suggestions, datasheets and sample‑quotation within 24 working hours.
Or contact our technical team with your application details - we will recommend the right alloy, supply condition, and product form.
Explore our superalloy products → Haynes 230 | Haynes 282 | Inconel 718
FAQ
Q1: What is the main difference between Haynes 230, Haynes 282, and Inconel 718?
A: Haynes 230 is a solid-solution strengthened alloy with excellent oxidation resistance to 1149°C and excellent weldability. Haynes 282 is a gamma-prime strengthened alloy with the best creep strength in the 649–927°C range. Inconel 718 is a precipitation-hardened alloy with the highest room-temperature strength but limited to ~650°C due to deleterious phase formation .
Q2: Which alloy has the best creep strength?
A: Haynes 282 has the best creep strength in the 649–927°C range, surpassing Waspaloy and approaching R-41 . A comparative study confirmed that Haynes 282 is significantly more creep resistant than Haynes 230 at 700–815°C .
Q3: Which alloy has the best oxidation resistance?
A: Haynes 230 has the best oxidation resistance, with outstanding resistance to oxidizing environments up to 2100°F (1149°C) for prolonged exposures . EIS testing at 1200°C confirmed better oxidation resistance than Inconel 718 .
Q4: What is the maximum service temperature of Inconel 718?
A: Inconel 718 is limited to operating temperatures below 650°C owing to degradation from deleterious phase formation above that temperature . For applications above 650°C, consider Haynes 230 or Haynes 282.
Q5: Which alloy is better for welded structures?
A: Haynes 230 and Haynes 282 both have excellent weldability. Inconel 718 has a higher tendency for liquation cracks than Haynes 230 . Haynes 282 was specifically designed with outstanding resistance to strain-age cracking .
Q6: Is Haynes 282 more corrosion resistant than Inconel 718?
A: Yes, in hydrochloric acid. Research showed Haynes 282 exhibited higher resistance to dissolution than Inconel 718 in HCl due to a more compact passive film with fewer defects .
Q7: Which alloy is cheaper?
A: Haynes 230 is generally cheaper due to its simpler composition. Inconel 718 contains niobium, which increases cost. Haynes 282 contains cobalt (10%), which also increases cost.
Q8: Can Haynes 230 replace Inconel 718 in all applications?
A: No. Inconel 718 offers higher room-temperature strength than Haynes 230. If your application requires maximum strength and fatigue resistance below 650°C, 718 remains the better choice. Haynes 230 is preferred when oxidation resistance above 650°C or welded structures are required.
Q9: Can Haynes 230 replace Inconel 718 for rotating turbine parts?
A: Not recommended. Haynes 230 is a solid‑solution alloy for static components. It lacks the high‑stress fatigue performance required for rotating parts designed around Inconel 718.
Q10: What welding filler metals should I use?
A: Inconel 718 uses matching 718 filler wire; Haynes 230 uses Haynes 230 filler; Haynes 282 requires matching Haynes 282 filler wire to retain joint high‑temperature performance.
Q11: Is Inconel 718 a better material than Haynes 230?
A: Neither alloy is universally better. Inconel 718 is known for high strength in applications up to about 1200°F (650°C), while Haynes 230 is particularly suited to high-temperature oxidation resistance and long-term thermal stability.
Q12: Is Haynes 282 Inconel?
A: No. Haynes 282 is a nickel-based, gamma-prime strengthened superalloy developed by Haynes International. It is a different alloy from Inconel 718, although both are nickel-based high-temperature alloys.
Q13: What are the downsides of Inconel 718?
A: Inconel 718 is generally less suitable for applications requiring sustained structural performance above about 1200°F (650°C). At higher temperatures, Haynes 282 offers higher strength according to Haynes' published data.
Q14: Is Inconel 718 good for high-temperature applications?
A: Yes. 718 provides excellent strength for many high-temperature applications, particularly below about 1200°F (650°C). For higher-temperature structural applications, alloys such as Haynes 282 may be considered.
Q15: What is another name for Inconel 718?
A: Inconel 718 is commonly identified as Alloy 718 or UNS N07718. The same UNS designation is also used for HAYNES 718.
Q16: Why is Inconel 718 so expensive?
A: Its cost reflects the use of nickel and other alloying elements, specialized melting and processing, heat treatment, tight specifications, and the demanding manufacturing requirements associated with aerospace and high-temperature applications.
Q17: What metal is stronger than Inconel 718?
A: Strength depends strongly on temperature, product form, heat treatment, and loading mode. At temperatures around 1200°F (649°C) and above, Haynes 282 and other gamma-prime strengthened superalloys can provide higher strength than 718.
Q18: Is Haynes 282 stronger than Inconel 718?
A: The comparison depends on temperature. Below about 1200°F (649°C), 718 has excellent creep strength among age-hardenable wrought nickel alloys; around 1200°F and above, Haynes 282 provides higher strength.
Q19: How does Haynes 282 compare with Inconel 718 by weight?
A: Haynes 282 has a density of about 8.27–8.29 g/cm³, so its weight is determined by the component's dimensions and design. A direct weight comparison with 718 should use the same geometry and product form rather than alloy name alone.
Q20: Is Haynes 282 suitable for high-temperature structural applications?
A: Yes. Haynes 282 was specifically developed for high-temperature structural applications and offers excellent creep strength from approximately 1200 to 1700°F (649 to 927°C), together with good weldability and fabricability.
Q21: Which is better for oxidation resistance, Haynes 230 or Inconel 718?
A: Haynes 230 is specifically designed for strong oxidation resistance and long-term thermal stability, with Haynes reporting prolonged oxidation resistance up to about 2100°F (1149°C) in oxidizing environments.
Q22: What is the difference between Haynes 282 and Inconel 718?
A: Haynes 282 is a gamma-prime strengthened alloy focused on high-temperature creep and structural performance, while 718 is an age-hardenable alloy known for high strength and fabrication characteristics up to about 1200°F (650°C).
Q23: What should I choose between Haynes 230, Haynes 282 and Inconel 718?
A: Consider Haynes 230 when oxidation resistance and long-term thermal stability are priorities, Haynes 282 when creep strength and high-temperature structural performance are critical, and 718 when high strength is required within its established temperature range.
Q24:Is Haynes 230 available as pipe and tube?
Yes. Haynes' current product-form information lists seamless and welded pipe and tube for Haynes 230, along with fittings.
