Inconel 600 and 718 Sheets and Plates – A Complete Comparison Guide
Both Inconel 600 and Inconel 718 plates are nickel-chromium superalloy plates, but due to fundamental differences in their strengthening mechanisms, their primary applications differ. Inconel 718 alloy plates are suitable for applications requiring high mechanical strength (especially creep and fatigue resistance) under high stress, while Inconel 600 plates are more suitable for high-temperature applications requiring resistance to oxidation and carburization but with lower strength requirements.
Will Inconel 600 rust?
The limiting chemical composition of the Inconel 600 alloy is shown in Table 1. Its high nickel content enables it to resist corrosion from a wide range of organic and inorganic compounds, and it is virtually free from chloride stress corrosion cracking.
Chemical Composition Comparison: Inconel 600 Plate vs. Inconel 718 Plate
| Element | Inconel 600 Plate (UNS N06600) | Inconel 718 Plate (UNS N07718) |
|---|---|---|
| Nickel (Ni) | ≥ 72.0 % | 50.0 - 55.0 % |
| Chromium (Cr) | 14.0 - 17.0 % | 17.0 - 21.0 % |
| Iron (Fe) | 6.0 - 10.0 % | Balance (~18%) |
| Niobium (Nb) + Tantalum (Ta) | – | 4.75 - 5.50 % |
| Molybdenum (Mo) | – | 2.80 - 3.30 % |
| Titanium (Ti) | – | 0.65 - 1.15 % |
| Aluminum (Al) | – | 0.20 - 0.80 % |
| Cobalt (Co) | – | ≤ 1.00 % |
| Copper (Cu) | ≤ 0.50 % | ≤ 0.30 % |
| Manganese (Mn) | ≤ 1.00 % | ≤ 0.35 % |
| Silicon (Si) | ≤ 0.50 % | ≤ 0.35 % |
| Carbon (C) | ≤ 0.15 % | ≤ 0.08 % |
| Phosphorus (P) | ≤ 0.015 % | ≤ 0.015 % |
| Sulfur (S) | ≤ 0.015 % | ≤ 0.015 % |
| Boron (B) | – | ≤ 0.006 % |
Physical Properties Comparison: Inconel 600 Plate vs. Inconel 718 Plate
| Property | Inconel 600 Plate (Annealed) | Inconel 718 Plate (Solution Annealed & Aged) |
|---|---|---|
| Density | 8.47 g/cm³ (0.306 lb/in³) | 8.19 g/cm³ (0.296 lb/in³) |
| Melting Range | 1354 - 1413 °C (2469 - 2575 °F) | 1260 - 1336 °C (2300 - 2440 °F) |
| Thermal Expansion Coefficient (20-100°C) | 13.3 × 10⁻⁶ /K | 13.0 × 10⁻⁶ /K |
| Thermal Conductivity (at 100°C) | 14.9 W/(m·K) | 11.4 W/(m·K) |
| Specific Heat Capacity (20°C) | 444 J/(kg·K) | 435 J/(kg·K) |
| Electrical Resistivity | 1.03 μΩ·m | 1.25 μΩ·m |
| Modulus of Elasticity (Young's Modulus) | 214 GPa (31.0 × 10⁶ psi) | 200 GPa (29.0 × 10⁶ psi) |
| Magnetic Permeability (Annealed/Aged) | Essentially non-magnetic (~1.01) | Slightly magnetic after aging (due to γ'' phase) |
| Poisson's Ratio | 0.29 | 0.30 |
Mechanical Properties and Strength of Inconel 600 and Inconel 718 Plates
The main functional difference lies in strength. Inconel 718 plate is a precipitation-hardening alloy that, after a specific two-step aging heat treatment, achieves extremely high yield strength and tensile strength. Inconel 600 plate is a solid solution alloy, primarily strengthened through cold working, exhibiting good strength at high temperatures, but its load-bearing capacity is lower than that of Inconel 718 plate.
Corrosion Resistance and Temperature Resistance of Inconel 600 and Inconel 718 Plates
Both alloys possess excellent high-temperature and corrosion resistance.
Inconel 600 plate exhibits excellent oxidation and carburization resistance, making it suitable for applications where these properties are primary considerations at extremely high temperatures (up to 1175°C). Due to its high nickel content, it also provides good resistance to chloride stress corrosion cracking.
Inconel 718 sheet offers good overall corrosion resistance, but its key performance characteristic is maintaining mechanical strength under high stress and high temperature (up to 700°C) conditions.
Weldability and Machining Properties of Inconel 600 and Inconel 718 Sheets
Inconel 718 sheet boasts excellent weldability, particularly its superior resistance to post-weld cracking, making it ideal for complex machined parts in aerospace and other critical applications.
Inconel 600 sheet also offers moderate weldability and is easily machined into a variety of components.
Typical Applications of Inconel 600 and Inconel 718 Sheets (Sheet Metal)
The choice between the two depends on the primary challenges of the application:
Applications for Inconel 600 sheet include furnace components (muffle furnaces, distillation kettles, etc.), chemical processing equipment, and heat exchangers, where high-temperature oxidation resistance is crucial.
Applications of the Inconel 718 board include high-stress, high-load environments, such as aircraft and land-based gas turbine engine components (casings, rings, sheet metal parts), liquid-fueled rockets, and high-stress oilfield tools.
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 stainless steel 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
Gnee Steel also supplies custom Inconel 600 products in various sizes and specifications. Please send us your drawings for a quote!
