Difference Between Inconel 600 and Inconel 718
Difference Between Inconel 600 and Inconel 718
The main difference between Inconel 600 and 718 lies in their strengthening mechanisms and applications: 600 is a solid solution-strengthened nickel-chromium alloy designed for excellent corrosion resistance and heat resistance during chemical processing; while 718 is a precipitation-strengthened alloy (using Al, Ti, and Nb), offering higher strength and is particularly suitable for aerospace applications, particularly for turbine components operating at temperatures up to 1300°F.
What are the differences between Inconel 625 and 718?
Inconel 625 and Inconel 718 both belong to the Inconel family and share many of the same properties. However, their main difference lies in their strength: Inconel 625 is characterized by its strong corrosion resistance, while Inconel 718 is characterized by its high strength. These two alloys have their own specific applications and cannot be substituted for each other.
1.Inconel 600 and Inconel 718 Chemical Composition
Inconel 600 Composition
| Grade | Ni | Cr | Fe | C | Mn | S | Si | Cu |
|---|---|---|---|---|---|---|---|---|
| Inconel 600 | 72.0 min | 14.0 – 17.0 | 6.0 – 10.0 | 0.15 max | 1.0 max | 0.015 max | 0.5 max | 0.5 max |
Inconel 718 Chemical Composition
| Grade | C | Mn | Si | Fe | S | Cr | Al | Ni | |
| 718 | min. | – | – | – | bal | – | 17.0 | 0.2 | 50.0 |
| max. | 0.08 | 0.35 | 0.35 | bal | 0.01 | 21.0 | 0.8 | 55.0 | |
Gnee Steel offers the following Inconel 600 and Inconel 718 product forms
Pipes:
Seamless Pipes (compliant with ASTM B167): Essential material for nuclear steam generator piping and chemical reactor coils.
Bars:
Round Bars (compliant with ASTM B166): Precision-ground bars suitable for high-strength fasteners and pump shafts.
Plates:
Cold-Rolled Plates (compliant with ASTM B168): Suitable for precision gaskets and heat shields.
Hot-Rolled Plates: Suitable for the manufacture of large pressure vessels.
Fittings and Flanges:
Welded Pipe Fittings: Elbows, Tees, and Reducers to complete your piping loops.
Custom Flanges: Compliant with ANSI/ASME, DIN, and JIS standards, ensuring strong, leak-proof connections.
2.Inconel 600 and Inconel 718 Mechanical Properties
Inconel 600 Melting Point, Density and Tensile Strength
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation | |
|---|---|---|---|---|---|
| 600 | 8.47 g/cm3 | 1413 °C (2580 °F) | Psi – 95,000 , MPa – 655 | Psi – 45,000 , MPa – 310 | 40 % |
Inconel 718 Melting Point, Density and Tensile Strength
| Ultimate Tensile Strength, psi | .2% Yield Strength psi | Elongation % | Hardness Rockwell B |
|---|---|---|---|
|
135,000 |
70,000 |
45 |
100 |
3.Inconel 600 and Inconel 718 equivalent grades
Inconel 600 Equivalent Grades
| STANDARD | WERKSTOFF NR. | UNS | GOST | AFNOR | JIS | BS | EN | OR |
|---|---|---|---|---|---|---|---|---|
| Inconel 600 | 2.4816 | N06600 | МНЖМц 28-2,5-1,5 | NC15FE11M | NCF 600 | NA 13 | NiCr15Fe | ЭИ868 |
Inconel 718 Equivalent Grades
| Grade | UNS No | Old British | Euronorm | GOST | Japanese JIS | ||
| BS | En | No | AFNOR | ||||
| Inconel 718 | N07718 | – | – | 2.4668 | – | – | – |
4.Differences between Inconel 600 and Inconel 718 Applications
The wide range of applications for Inconel 600 and Inconel 718 reflects their unique mechanical and chemical properties. Inconel 600 is widely used in the chemical industry, often in applications involving contact with highly corrosive chemicals and corrosive environments. Due to its excellent oxidation resistance and seawater corrosion resistance, Inconel 600 is also used in the aerospace and marine industries.
On the other hand, Inconel 718 has extensive applications in the aerospace field, particularly in the manufacture of turbine disks, shafts, and other high-temperature components. Its superior high-temperature strength and creep resistance ensure reliable engine performance under extreme temperatures. Inconel 718 is also used in the oil and gas industry, where its corrosion resistance and high-temperature strength are crucial for downhole components.
5.Price Difference Between Inconel 600 and 718
| Inconel 600 Price | Origin | Price in INR (per kg) |
Price in USD (per kg) |
Price in Euro (per kg) |
|---|---|---|---|---|
| Inconel 600 Price in Japan | Japanese | Rs 2800/- | $40 | €35 |
| Inconel 600 Price in UK / Europe | European | Rs 3100/- | $45 | €39 |
| Inconel 600 Price in USA | USA | Rs 3400/- | $50 | €43 |
| Inconel 718 Price | Origin | Price in INR (per kg) |
Price in USD (per kg) |
Price in Euro (per kg) |
| Inconel 718 Price in Japan | Japanese | Rs 3500/- | $51 | €43 |
| Inconel 718 Price in UK / Europe | European | Rs 3700/- | $54 | €46 |
| Inconel 718 Price in USA | USA | Rs 4500/- | $65 | €56 |
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅ Over 18 years of export experience, products sold to more than 80 countries
✅ Certified by ISO, SGS, and BV
✅ Global inventory of Inconel, Hastelloy, Incoloy, and Monel alloy tubing, plates, and bars
✅ Custom processing services available – including cutting, polishing, CNC machining, and packaging
✅ Fast delivery within 7-15 days, supported by global logistics partners
📦 Packaging and Shipping
All Nickel Based Alloy products are packaged using the following methods:
Wooden pallets or crates
Moisture-proof packaging
Labels with furnace number, standard, and size labels
Shipped worldwide by sea, air, or express
About Gnee Steel
Gnee Steel is a professional manufacturer of nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy 800, Incoloy 800H/HT, Incoloy 825, Monel 400, Monel K500, and other high-temperature alloy materials. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power generation, automotive, nuclear energy, and other fields, and we can provide customized alloy material solutions according to customer needs. For inquiries about alloy material prices or customized alloy material solutions, please feel free to contact us via email at ss@gneemetal.com for a quote.
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FAQ
Q: What is the difference between Inconel 600 and Alloy 600?
A: Alloy 600 is non-magnetic, possesses excellent mechanical properties, combines high strength with good machinability, and is easy to weld. Inconel 600 exhibits the typical cold-forming characteristics of chromium-nickel stainless steel.
Q: What is another name for Inconel 718?
A: Nickel Alloy 718
Nickel Alloy 718, commonly known as Inconel 718, is a precipitation-hardening, corrosion-resistant, and heat-resistant nickel alloy, available in various forms including bars, forgings, plates, and sheets.
Q: Disadvantages and alternatives of Inconel 718
A：While Inconel 718 possesses excellent mechanical properties and corrosion resistance, it also has some disadvantages: Cost: Due to its complex manufacturing process, Inconel 718 is relatively expensive. Machining Difficulty: Its high hardness makes material removal extremely challenging and accelerates tool wear.
Q: What is the maximum operating temperature of Inconel 625?
A: Grade 1 Inconel 625 has a rated continuous operating temperature up to 1100°F (593°C). Grade 2 Inconel 625 has a rated operating temperature up to approximately 1800°F (982°C), where creep and oxidation resistance are primary considerations. Above 1200°F (649°C), the strength of Inconel 625 decreases, but its chromium oxide coating prevents oxidation. For load-bearing applications above 1500°F (815°C), ASTM B167 standard is recommended due to its aluminum content, which provides excellent cyclic oxidation resistance.
Q: What are the applications of Inconel 718?
A: Inconel 718 is a nickel-based superalloy renowned for its high creep strength, tensile strength, and fracture strength at temperatures up to 700°C, making it suitable for critical applications in industries such as aerospace turbines, automotive, medical, and chemical.
Q: Why is Inconel 718 difficult to machine?
A: The excellent high-temperature properties of Inconel 718 nickel-based superalloys make it widely used in the aerospace, marine, and automotive industries. However, Inconel 718's poor thermal conductivity and rapid strain hardening characteristics result in poor machinability and a less desirable surface finish.
Q: Will Inconel 600 rust?
A: Inconel 600 alloy has a high nickel content, thus resisting corrosion from many organic and inorganic compounds and exhibiting virtually no chloride stress corrosion cracking.
