Super Alloy
Henan Gnee New Material Co., Ltd. is an integrated supply chain enterprise encompassing steel plates, steel coils, profiles, outdoor landscape design, and processing. Our products include: superalloys, Incolone alloys, Incolone alloys, Monel alloys, duplex stainless steel, Hastelloy alloys, titanium alloys, copper alloys, aluminum alloys, stainless steel pipes, stainless steel plates, stainless steel coils, stainless steel fittings, and stainless steel bars.
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Rich Experience
GNEE Alloy was founded in 2008 and has over 18 years of experience in steel manufacturing.
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GNEE Alloy is a professional one-stop supply chain company for steel products, covering product research and development, sales, promotion and professional services.
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The company's products are sold to Europe, Australia, and other regions, and exported to more than 70 countries worldwide. The company has more than 160 partner companies globally, including 15 shipbuilding companies, 123 engineering project companies, and 23 boiler machinery manufacturers.
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Our annual product sales volume is 1 million tons, our inventory is 200,000 tons, and our annual export volume has reached 80,000 tons, ensuring on-time delivery.
Superalloys are high-performance metallic materials designed for extreme environments, offering exceptional strength, creep resistance, and corrosion resistance at elevated temperatures (often >500°C). Primarily used in jet engines and gas turbines, they are typically based on nickel, cobalt, or iron and maintain structural integrity near their melting points.
Superalloy jet turbine engine
Gnee Alloy's superalloys are renowned for their exceptional performance, making them suitable for extreme environments. Below are the key characteristics that determine their performance, along with specific parameters for their applicability.
High-Temperature Strength
Superalloys retain their mechanical strength at temperatures typically exceeding 0.7 times their melting point (e.g., nickel-based superalloys have an effective operating temperature above 1000°C). This is primarily achieved through solid solution strengthening and precipitation strengthening, especially in nickel-based alloys through the strengthening of the γ′ phase.
Creep Resistance
Creep refers to the slow plastic deformation of a material under constant stress at high temperatures. Superalloys minimize creep. For example, single-crystal nickel-based superalloys can withstand stresses up to 200 MPa at 1000°C and maintain creep resistance for thousands of hours.
Oxidation and corrosion resistance
Elements such as chromium (Cr, typically 10–20 wt%) and aluminum (Al, 5–7 wt%) form protective oxide layers (e.g., Cr₂O₃ or Al₂O₃), enabling high-temperature alloys to resist oxidation and high-temperature corrosion in environments such as combustion gases.
Fatigue resistance
High-temperature alloys can withstand cyclic loading at high temperatures, which is crucial for components subjected to thermal and mechanical fatigue (e.g., turbine blades). Under certain conditions, their fatigue life can exceed 10⁷ cycles.
Fracture toughness
High-temperature alloys maintain toughness even in the presence of cracks, with fracture toughness values (K₁c) typically ranging from 20 to 50 MPa·m¹/² at high temperatures.
The following table summarizes the main properties of high-temperature alloys by type:
| Superalloy Type | Base Element | Operating Temperature (°C) | Key Features |
|---|---|---|---|
| Nickel-Based | Ni | Up to 1100 | High strength, excellent creep resistance, γ′ phase strengthening |
| Cobalt-Based | Co | Up to 1200 | Superior wear resistance, high thermal stability |
| Iron-Based | Fe | 600–850 | Cost-effective, moderate strength |
Common Types of Super Alloy
In the relentless environment of modern aerospace propulsion, superalloys are the silent workhorses. Choosing the right material isn't just about heat resistance; it’s about balancing microstructural stability with mechanical integrity.
Nickel-Based Superalloys: The Gold Standard
Comprising more than 50% of the structural weight in advanced aero-engines, nickel-based alloys are the industry benchmark. Their superior creep resistance and high-temperature strength stem from an austenitic (FCC) matrix reinforced by coherent γ′ [Ni3(Al,Ti)] precipitates. For the most demanding environments—specifically first-stage turbine blades—single-crystal (SX) casting and directional solidification are utilized to eliminate grain boundary failures, allowing engines to operate at temperatures nearing the material's melting point.
Iron-Nickel-Based Alloys: Performance at Scale
When cost-efficiency is as critical as performance, iron-nickel-based superalloys bridge the gap. By leveraging intermetallic precipitation within an FCC matrix, these alloys deliver oxidation resistance and creep properties that rival their nickel-based counterparts. They represent the "sweet spot" for high-stress components where extreme temperature demands are slightly lower, but economic viability is paramount.
Cobalt-Based Superalloys: The Thermal Fatigue Specialists
The discovery of the Co-Al-W system in 2006 revitalized interest in cobalt-based metallurgy. Unlike traditional alloys, these rely on a solid-solution-strengthened matrix with targeted carbide integration. Cobalt’s true advantage lies in its superior weldability and resistance to thermal fatigue. Furthermore, thanks to high chromium (Cr) concentrations, these alloys excel in corrosive environments between 980°C and 1100°C, making them indispensable for specific hot-section applications that face intense thermal cycling.
Nickel based Alloys
| MIDHANI Alloy Name | Trade Name | UNS No. | British Specs | American Specs | German Specs | French Specs |
|---|---|---|---|---|---|---|
| Superni 600 | Inconel 600 | N06600 | BS 3072 | AMS 5540 Sheet, Strip and Plate AMS 5665 Bar and Forging ASTM B 168, DTD 328 A | NiCr15Fe8 2.4816 | AFNOR NC15Fe |
| Superni 201 | Nickel 201 | N02201 | ASTM B 160, 161,162,163, B 36666, B 375,B370 | 2.4068 | ||
| Superni 601 | Inconel 601 | N06601 | AMS 5715 Bar and Forgings AMS 5870 Sheet, Strip and Plate | 2.4851 | ||
| ASTM B166 | ||||||
| Superni 617 | Inconel 617 | N06617 | AMS 5887 Bar and Forgings AMS 5888 Plate | NiCr23Co12Mo WS 2.4663 | ||
| Superni 625 | Inconel 625 | N06625 | BS 3072 | AMS 5666 Bar, Forgings AMS 5869 Sheet, Strip and Plate | NiCr22Mo9Nb 2.4856 | AFNOR NC22DNb |
| Superni 690 | Inconel 690 | N06690 | ASTM B 163 | 2.4642 | ||
| Superni 706 | Inconel 706 | N09706 | AMS 5701 Bar and Forgings | |||
| Superni 718 | Inconel 718 | N07718 | AMS 5662 Bar and Forgings AMS 5596 Sheet, Strip and Plate | NiCr19Fe19Nb5Mo3 2.4668 | ||
| Superni 750 | Inconel X750 | N07750 | AMS 5542 Sheet, Strip and Plate AMS 5747 Bar and Forgings | 2.4669 | ||
| Superni 740H | ||||||
| Superni C276 | Inconel C276 Hastelloy C276 | N10276 | ASTM B575 | NiMo16 Cr15W 2.4819 | ||
| Superni 75 | Nimonic 75 Haynes 75 | N06075 | BS HR5 BS HR203 | 2.4630 2.4951 | AFNOR NC 20T | |
| Superni 76 | Hastelloy X | N 06002 | AMS 5754 AMS 5536 | NiCr22Fe18Mo 2.4665 | ||
| Superni 80A | Nimonic 80A | N07080 | BS HR1 Alloy 80A Bar | ASTM B637 | NiCr20TiAl 2.4952 | AFNOR NC 20TA |
| Superni 90 | Nimonic 90 | N07090 | BS HR2 Alloy 90 bar BS HR202 Alloy 90 sheet | AMS 5829 Welding Wire | 2.4632 | |
| Superni 263 | Nimonic 263 Haynes 263 | N07263 | BS HR10 BS HR206 BS HR404 | AMS 5872 Sheet and Plate AMS 5886 Bar and Forgings | NiCo20Cr20Mo6Ti2Al 2.4650 | |
| Superni 105 | Nimonic 105 | BS HR3 | 2.4634 | AFNOR NCKD 20ATv | ||
| Superni 115 | Nimonic 115 | BS HR4 | 2.4636 | AFNOR NCK 15ATD | ||
| Superni 100 | IN 100 | N13100 | AMS 5397 | |||
| Supercast 713C | Inconel 713C | |||||
| Supercast 247A | CM 247 MAR M 247 |
Cobalt based Alloys
| MIDHANI Alloy Name | Trade Name | UNS No. | British Specs | American Specs | German Specs | French Specs |
|---|---|---|---|---|---|---|
| Superco 605 | Haynes 25 Udimet L605 | UNS R30605 | AMS 5537 Sheet AMS 5759 Bar & Rod | |||
| Superco 35 | MP35N | UNS R30035 | AMS 5844 | |||
| Superco 783 | Inconel 783 | R30783 | AMS 5940 |
Iron based Alloys
| MIDHANI Alloy Name | Trade Name | UNS No. | British Specs | American Specs | German Specs | French Specs |
|---|---|---|---|---|---|---|
| Superfer 800/800H | Incoloy 800 Incoloy 800H | N08800 N08810 | BS 3072 | AMS 5766 Bar and Forgings AMS 5871 Sheet, Strip and Plate ASTM B408 | X8 NiCrAlTi 32-21 1.4876 1.4958 1.4959 | |
| Superfer 825 | Incoloy 825 | UNS N08825 | BS 3072 | ASTM B425 ASTM B424 | NiCr 21 Mo 2.4858 | |
| Superfer A286 | Incoloy A-286 | S66286 | ASTM A 453 AMS 5525 AMS 5731 | X5 NiCrTi 26-15 1.4980 |
Applications of Super Alloy
Aerospace: Nickel-based superalloys are core components of jet engines and gas turbines, used to manufacture turbine blades, turbine disks, combustion chambers, and casings. For example, single-crystal turbine blades operate at temperatures up to 1100°C and stresses of 150–200 MPa. Nickel-based superalloys like HAYNES 282 are used in gas turbine blades, combustion chambers, and exhaust components, operating at temperatures ranging from 649–982°C. HAYNES 282 exhibits excellent weldability, meeting the assembly and maintenance requirements of complex components, and its creep resistance is superior to alloys such as Inconel 718.
Energy: High-temperature alloys are widely used in onshore gas turbines and nuclear power plants, particularly in steam generator tubes and high-temperature components, operating at temperatures up to 600–1000°C.
Marine: Cobalt-based superalloys are used in marine gas turbines due to their excellent resistance to seawater corrosion and high temperatures.
Automotive: Superalloys are used in turbocharger rotors operating at temperatures up to 800°C, effectively improving engine efficiency.
Oil and Gas: Superalloys are crucial for components in deep-sea drilling and extraction operations that must withstand high pressure, high temperature (HPHT) and corrosive fluids.
Chemical and Metallurgical Industries: Superalloys are used in high-temperature furnaces, heat exchangers, valves, and piping systems that typically operate in corrosive chemical environments at 700–1000°C.
Medical: Some cobalt-based superalloys are used in medical implants such as hip and knee replacements due to their biocompatibility and wear resistance.
Components of Super Alloy
| Element | Role | Typical Content (wt%) |
|---|---|---|
| Chromium (Cr) | Oxidation and corrosion resistance | 10–20 |
| Aluminum (Al) | Forms γ′ phase, oxidation resistance | 5–7 |
| Titanium (Ti) | Forms γ′ phase, strengthens alloy | 1–5 |
| Molybdenum (Mo), Tungsten (W) | Solid-solution strengthening | 2–10 |
| Tantalum (Ta), Niobium (Nb), Rhenium (Re) | Creep resistance, phase stability | 1–6 |
| Boron (B), Zirconium (Zr) | Grain boundary strengthening | 0.01–0.1 |
Nickel-based superalloys
Hastelloy is a commonly used nickel-based superalloy, and its chemical composition varies depending on the application.
The composition of Hastelloy C22 is as follows:
56% Nickel
22% Chromium
13% Molybdenum
Others: Small amounts of iron, tungsten, and cobalt
Inconel 625 differs from typical Inconel alloys, having a higher nickel content and a lower molybdenum content; its composition is as follows:
58-71% Nickel
21-23% Chromium
8-10% Molybdenum
5% Iron
Others: Small amounts of niobium, cobalt, and manganese
Cobalt-based superalloys
Cobalt-based superalloys are typically composed of cobalt and chromium. X-40, a non-ferrous cobalt based alloy is used mainly for its excellent creep resistance.
A typical composition Alloy X-40 is:
54% cobalt
24% chromium
10% nickel
7.5% tungsten
0.5% carbon
Iron-based superalloys
A-286 is a frequently used iron-based superalloy. It can be thought of as an evolution of stainless steel, offering the usual corrosion resistance, only up to an extreme of 700 degrees Celsius.
A-286 is like all stainless steels in that it is primarily composed of iron and chromium. These are the other elements present:
53% iron
26% nickel
15% chromium
7.5% tungsten
2.15% aluminum
Process of Super Alloy
The production of high-temperature alloys is a complex metallurgical process, typically aimed at achieving optimal material properties. Key steps include:
Vacuum Induction Melting (VIM): Melting metal billets in a vacuum environment to avoid contamination and control overall composition.
Electroslag Remelting (ESR): This technology prepares high-temperature alloys by removing impurities and improving microstructure.
Directional Solidification: Primarily used to obtain single-crystal or columnar crystal structures, thereby improving mechanical properties.
Powder Metallurgy: Sintering high-temperature alloy powders using high-pressure sintering methods to manufacture dense, structurally complex, and higher-strength components.
Through these production technologies, high-temperature alloys are able to maintain their properties, which are crucial for critical applications.
Our Superalloy Certificate
Gnee Steel's superalloy product manufacturing technology has reached the world average level, gaining recognition from dozens of project companies and becoming a leading nickel-based alloy and high-temperature alloy supplier in Asia.
The Group adheres to the principle of "one-stop service, making choices easier". Continuing to meet the different needs of global customers in the field of the world's steel supply chain. A professional sales team provides customers with first-class services. A rigorous procurement and quality inspection team selects high-quality raw materials. A shipping and logistics team that ensures the protection of product transportation.
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Frequently Asked Questions
Q:What are superalloys?
A: Superalloys are advanced metallic materials designed to withstand extreme temperatures, often exceeding 0.7 times their melting point, while maintaining mechanical strength, creep resistance, and corrosion resistance. They are typically based on nickel, cobalt, or iron.
Q:What are the main types of superalloys?
A: The three main types are:
Nickel-based: Operate up to 1100°C, known for high strength and creep resistance.
Cobalt-based: Operate up to 1200°C, offering superior wear resistance and thermal stability.
Iron-based: Operate up to 600–850°C, cost-effective with moderate strength.
Q:How were superalloys developed historically?
A: Early 20th Century: Stainless steels and basic nickel-chromium alloys used for early gas turbines.
1940s: Nickel-based alloys like Nimonic 80 developed for jet engines during WWII.
1950s–1960s: Vacuum melting and γ′ phase discovery improved performance.
1970s–1980s: Single-crystal superalloys and rare elements like rhenium enhanced properties.
1990s–Present: Advances in directional solidification and additive manufacturing improved production.
Q:What are the key alloying elements in superalloys?
A: Common elements include: Chromium (Cr, 10–20 wt%): Enhances oxidation and corrosion resistance.
Aluminum (Al, 5–7 wt%): Forms γ′ phase and improves oxidation resistance.
Titanium (Ti, 1–5 wt%): Strengthens through γ′ phase.
Molybdenum (Mo), Tungsten (W, 2–10 wt%): Provide solid-solution strengthening.
Tantalum (Ta), Niobium (Nb), Rhenium (Re, 1–6 wt%): Improve creep resistance.
Boron (B), Zirconium (Zr, 0.01–0.1 wt%): Strengthen grain boundaries.
Q: What is creep resistance, and why is it important?
A: Creep is the slow deformation of a material under constant stress at high temperatures. Superalloys, particularly nickel-based single-crystal alloys, resist creep at stresses up to 200 MPa at 1000°C for thousands of hours, making them ideal for components like turbine blades.
Q:What is an example of a superalloy?
A: Superalloys are high-performance metallic materials like Inconel, Hastelloy, and René alloys defined by their ability to maintain strength and shape in extreme environments.
Q:Is Inconel 718 a superalloy?
A: Inconel 718 is a high-strength, corrosion-resistant nickel-based superalloy. It possesses excellent mechanical properties, high-temperature strength, and resistance to oxidation and corrosion.
Q:What is the difference between a superalloy and an alloy?
A: Superalloys are high-performance alloys that exhibit many of the same characteristics but at a higher level. They feature superior corrosion and heat resistance, excellent surface stability, exceptional mechanical strength and strong creep resistance at elevated temperatures.
Q:What does superalloy mean?
A: A superalloy, or high-performance alloy, is a metallic material engineered to operate at high fractions of its melting point, typically above 500°C while maintaining exceptional mechanical strength, creep resistance, and surface stability. These materials are designed to resist oxidation, corrosion, and structural deformation in extreme environments, such as jet engines and power turbines.
Q:Is Inconel 625 a superalloy?
A: Inconel 625 (Alloy 625) is a wrought nickel-based superalloy strengthened mainly by the additions of carbon, chromium, molybdenum, and niobium. Developed for service at temperatures below 973 K, this alloy combines the high strength of the age-hardening nickel-based alloys with excellent fabrication characteristics.
Q:Is Inconel a superalloy?
A: Inconel alloys, a family of nickel-chromium-based superalloys, are widely recognized for their exceptional mechanical strength, oxidation resistance, and corrosion resistance under extreme thermal and chemical environments.
Q:Is titanium a superalloy?
A: There are numerous variations of superalloys used in the aerospace industry. One of the most commonly used variations is titanium-based superalloys. Pure titanium has a relatively low density, high strength, and high corrosion resistance.
Q:Is hastelloy a superalloy?
A: Hastelloy is a high-performance nickel-based superalloy designed to handle extreme heat plus corrosive environments. The metal belongs to a category of materials known to maintain structural integrity under severe mechanical stress. Chemical processing plants use the alloy to handle hazardous liquids safely.