Inconel 600 and Inconel 718 with ample stock and strong processing capabilities? You've come to the right place. As a leading nickel alloy plate manufacturer and factory with over 20 years of experience and ISO 9001 certification, stocks plates in a wide range of thicknesses and sizes. This comprehensive guide provides a detailed comparison of Inconel 600 and Inconel 718 alloy plates, covering their material properties, processing characteristics, corrosion resistance, and selection criteria for specific applications, aiming to help you optimize your design and procurement decisions.
Comparison information for Inconel 600/718 alloy sheets
Inconel 600 plates offer excellent corrosion/oxidation resistance and high-temperature strength without requiring age hardening; while Inconel 718 alloy plates, through precipitation hardening treatment, achieve significantly higher mechanical strength (tensile strength and yield strength), making them more suitable for demanding aerospace components subjected to high stress and high temperatures. However, they are more expensive and more difficult to process. In short, the 600 series alloys excel in corrosion resistance, while the 718 series alloys are superior in strength.
At what temperature does Inconel 718 oxidize?
1223 K to 1573 K
In normal atmospheric air, the oxidation rate of Inconel 718 exhibits a parabolic behavior and is diffusion-controlled over a wide temperature range of 1223 K to 1573 K, even over extended periods (up to several weeks). At temperatures above 1573 K, oxidation becomes very severe, leading to significant material deformation.
Specification of Inconel 600/601/625/718 Sheets and Plates
ASTM B168 / ASME SB168
1000mm, 1219mm, 1500mm, 1800mm, 2000mm, 2500mm, 3000mm, 3500mm, etc
2000mm, 2440mm, 3000mm, 5800mm, 6000mm, etc
0.3 mm to 120 mm
Coils, Foils, Rolls, Plain Sheet, Shim Sheet, Perforated Sheet, Chequered Plate, Strip, Flats, Blank (Circle), Ring (Flange) etc.
Hot rolled plate (HR), Cold rolled sheet (CR),2B, 2D, BA, NO.1, NO.4, NO.8, 8K, mirror, Chequered, embossed, hair line, sand blast, Brush, etching, SATIN (Met with Plastic Coated) etc.
1. Overview: Inconel 600 and Inconel 718 Plates
Plates are a key raw material form for manufacturing pressure vessels, heat exchangers, structural components, and processed blanks. Inconel 600 and Inconel 718 plates serve different industrial sectors due to their distinct performance characteristics.
Inconel 600 Plate: A solid-solution strengthened nickel-chromium-iron alloy plate, known for its excellent high-temperature oxidation resistance, carburization resistance, good processability, and stable structural properties. It is particularly suitable for heat treatment industries, chemical processing, and nuclear power plant environments.
Inconel 718 Plate: A precipitation-hardened (age-hardened) nickel-based superalloy plate that achieves extremely high strength through heat treatment. Its core advantages lie in its exceptional high-temperature strength up to 700℃, creep resistance, and good weldability, making it a critical material for high-end equipment in the aerospace and energy sectors.
GNEE Warehouse 718 Sheet Metal Inventory
2. Chemical Composition and Material Standard Comparison: Inconel 600 Plate vs Inconel 718 Plate
| Inconel 600 Plate Standard (%) | Inconel 718 Plate Standard (%) | ||
|---|---|---|---|
| >= 72 | 50 – 55 | The higher nickel content in 600 plate provides better corrosion resistance in reducing media and better carburization resistance. | |
| 14 – 17 | 17 – 21 | Both provide oxidation resistance. 718 plate has slightly higher chromium content, offering better high‑temperature oxidation protection. | |
| 6 – 10 | Iron is a major alloying element in 718 plate, affecting its physical and processing properties. | ||
| <= 0.3 | 0.2 – 0.8 | Key difference. Aluminum in 718 participates in the formation of the ′ strengthening phase, which is essential for achieving precipitation hardening. | |
| <= 0.3 | 0.65 – 1.15 | Key difference. Works together with aluminum and is a core element for precipitation hardening in 718. | |
| Niobium + Tantalum (Nb+Ta) | – | 4.75 – 5.5 | Key difference. Niobium in 718 forms the ″ strengthening phase, which is the main reason for its ultra‑high strength. 600 contains no niobium. |
| – | 2.8 – 3.3 | 718 contains molybdenum, which enhances solid‑solution strengthening and resistance to pitting corrosion. | |
| <= 0.15 | <= 0.08 | 600 plate has slightly higher carbon content, requiring attention to the effect of carbide precipitation on toughness during long‑term high‑temperature service. |
Inconel 600 Plate: ASTM B168, ASME SB168, AMS 5540, UNS N06600
Inconel 718 Plate: ASTM B670 (Age-hardened plate), AMS 5597, UNS N07718
3. Comparison of mechanical properties and supply conditions of Inconel 600 and Inconel 718
The supply condition of the sheet metal directly affects its subsequent processing and final performance.
Typical States and Properties of Inconel 600 Sheet Metal
Solution Annealed - The most commonly used state, possessing good toughness and workability.
>= 550 MPa
Yield Strength (0.2%): >= 240 MPa
>= 30%
Relatively low strength and hardness, but excellent ductility and toughness, suitable for cold forming operations.
Typical States and Properties of Inconel 718 Sheet Metal
- Suitable for subsequent cold forming and machining, followed by aging treatment.
- High-strength state for direct use, difficult to form.
Typical Room Temperature Mechanical Properties (Solution Treated + Aged State):
>= 1275 MPa
Yield Strength (0.2%): >= 1035 MPa
>= 12%
Extremely high strength in the aged state, approximately 2.3 times that of 600 sheet metal, but lower plasticity; forming should be performed in the solution-treated state.
Advantages of choosing Gnee Inconel 718 plates
4. Comparison of Typical Application Scenarios for Inconel 600 and Inconel 718 Plates
Typical applications of Inconel 600 plates:
Furnace chambers, muffles, radiant tubes, and trays for carburizing furnaces, annealing furnaces, and ammonia cracking furnaces.
Equipment for the production and processing of sodium hydroxide (caustic soda), and organic chlorination reactors.
Steam generator tube sheets, support plates, and liners for nuclear waste treatment containers.
Engine combustion chamber liners, exhaust pipes (non-load-bearing structures).
Typical applications of Inconel 718 plates:
Engine casings, mounting sections, welded structural components of load-bearing bulkheads, and afterburner components.
Combustion chamber flame tubes, transition sections, and casings.
High-strength pressure vessels, and special valve bodies.
Molds and tooling fixtures requiring extremely high strength and certain corrosion resistance.
5. Price Difference Between Inconel 600 Plate and 718 Sheet
| Inconel 600 Price | ||||
|---|---|---|---|---|
| Inconel 600 Price in India | $30 | €24 | ||
| Inconel 600 Price in Japan | $40 | €35 | ||
| Inconel 600 Price in UK / Europe | $45 | €39 | ||
| Inconel 600 Price in USA | $50 | €43 | ||
| Inconel 718 Price | ||||
| Inconel 718 Price in India | $46 | €39 | ||
| Inconel 718 Price in Japan | $51 | €43 | ||
| Inconel 718 Price in UK / Europe | $54 | €46 | ||
| Inconel 718 Price in USA | $65 | €56 |
6. Cost Analysis and Selection Decision Guide
1, Material Unit Price: The unit price of Inconel 718 plates is significantly higher than that of Inconel 600 plates (usually 50%-100% higher), mainly due to the cost of alloying elements (such as niobium) and the more complex manufacturing process.
2, Processing and Manufacturing Costs:
If 718 plates require heat treatment, it increases the heat treatment cost and cycle time.
718 plates are more difficult to form and machine, resulting in higher processing costs.
600 plates are easier to form, resulting in relatively lower processing costs.
3, Design Impact: Using high-strength 718 plates may allow for a reduction in component thickness, thus saving on material usage, but the manufacturing difficulty needs to be comprehensively evaluated.
Inconel 718 Plate Selection Decision Flowchart
Inconel 600 and Inconel 718 alloy plates, information on available thicknesses and sizes in stock, and a free feasibility assessment for machining your component designs.
Gnee Steel is a professional manufacturer of various nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel Alloy 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy Alloy 800, Incoloy 800H/HT, Incoloy 825, Monel Alloy 400, Monel K500, and high-temperature alloys. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power, automotive, and nuclear energy industries, and we can provide customized alloy material solutions according to customer needs. For alloy material price inquiries or to request customized alloy material solutions, please feel free to contact us at ru@gneesteelgroup.com for a quote.