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Inconel 718/825 Sheet, Plate & Coil is a high-performance nickel-chromium alloy known for its excellent resistance to oxidation and corrosion. It is widely used in industrial applications where high temperature and corrosive environments are common, such as chemical processing, aerospace, and power generation.
The alloy’s superior mechanical properties, including high tensile strength and durability, make Inconel 718/825 an ideal choice for manufacturing sheets, plates, and coils. These forms are versatile and can be easily fabricated into components for various industrial applications.
Inconel 718/825 Sheets are available in different thicknesses and dimensions, making them suitable for custom applications. They are commonly used in heat exchangers, furnace components, and chemical reactors due to their exceptional thermal stability.
Inconel 718/825 Plates offer excellent resistance to high-temperature corrosion and are often used in flanges, pressure vessels, and structural components in chemical and petrochemical industries. Their high strength at elevated temperatures ensures long-lasting performance.
Inconel 718/825 Coils are widely utilized in applications requiring continuous processing or forming, such as in industrial equipment and heat treatment systems. Coils can be cut, rolled, and formed into custom parts as per engineering requirements.
The chemical composition of Inconel 718/825 includes nickel, chromium, and iron, which contribute to its outstanding corrosion resistance and mechanical strength. The alloy maintains stability in both oxidizing and reducing environments, including acidic and alkaline solutions.
Inconel 718/825 is highly resistant to scaling and oxidation, even at temperatures up to 1200°F (650°C). This property makes it suitable for use in high-temperature furnace components, combustion chambers, and aerospace engine parts.
Fabrication of Inconel 718/825 Sheets, Plates, and Coils can be done using standard techniques such as welding, machining, and forming. Proper handling and heat treatment ensure optimal performance and longevity of the alloy components.
Specification Table
| Grade | Product Type | Standard | Thickness (mm) | Width (mm) | Length (mm) | Surface Finish |
|---|---|---|---|---|---|---|
| Inconel 718 | Sheet | ASTM B443 / ASME SB443 | 0.5 - 200 | 1000 - 2000 | 1000 - 6000 | 2B, BA, No. 1, No. 4 |
| Inconel 718 | Plate | ASTM B443 / ASME SB443 | 6 - 200 | 1000 - 2500 | 2000 - 8000 | Mill Finish, Polished |
| Inconel 718 | Coil | ASTM B443 / ASME SB443 | 0.5 - 6 | 1000 - 2000 | Coil Length | 2B, BA |
| Inconel 825 | Sheet | ASTM B443 / ASME SB443 | 0.5 - 150 | 1000 - 2000 | 1000 - 6000 | 2B, BA, No. 1 |
| Inconel 825 | Plate | ASTM B443 / ASME SB443 | 6 - 150 | 1000 - 2500 | 2000 - 8000 | Mill Finish, Polished |
| Inconel 825 | Coil | ASTM B443 / ASME SB443 | 0.5 - 6 | 1000 - 2000 | Coil Length | 2B, BA |
Chemical Composition (Typical ranges for SSSheet)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Inconel 718 | Inconel 825 |
|---|---|---|
| Nickel (Ni) | 50 - 55 | 38 - 46 |
| Chromium (Cr) | 17 - 21 | 19.5 - 23.5 |
| Iron (Fe) | Balance | Balance |
| Cobalt (Co) | ≤1 | ≤2 |
| Molybdenum (Mo) | 2.8 - 3.3 | 2.5 - 3.5 |
| Niobium + Tantalum (Nb + Ta) | 4.75 - 5.5 | ≤0.6 |
| Copper (Cu) | ≤0.3 | 1.0 - 2.0 |
| Titanium (Ti) | 0.65 - 1.15 | ≤0.2 |
| Aluminium (Al) | 0.2 - 0.8 | 0.2 - 0.6 |
| Carbon (C) | ≤0.08 | ≤0.10 |
| Manganese (Mn) | ≤0.35 | ≤1.0 |
| Silicon (Si) | ≤0.35 | ≤0.5 |
| Phosphorus (P) | ≤0.015 | ≤0.03 |
| Sulfur (S) | ≤0.015 | ≤0.03 |
Mechanical Properties (Typical)
| Property | Inconel 718 | Inconel 825 |
|---|---|---|
| Ultimate Tensile Strength (MPa) | 950 - 1,270 | 620 - 827 |
| Yield Strength (MPa) | 550 - 1,030 | 275 - 414 |
| Elongation (%) | 12 - 20 | 30 - 45 |
| Hardness (HB) | 200 - 290 | 170 - 235 |
| Modulus of Elasticity (GPa) | 200 | 190 |
| Density (g/cm³) | 8.19 | 8.40 |
| Operating Temperature (°C) | Up to 700 | Up to 600 |
Equivalent Grades
| Grade | ASTM / ASME | UNS | EN / DIN | JIS | Other Standards |
|---|---|---|---|---|---|
| Inconel 718 | B443, SB443, B444, SB444 | UNS N07718 | 2.4668 | なし | AMS 5662, AMS 5663, MIL-S-21635 |
| Inconel 825 | B443, SB443 | UNS N08825 | 2.4858 | なし | AMS 5817, ASTM B425 |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Grade | Product Type | Thickness (mm) | Width (mm) | Length (mm) | Weight (kg/m²) |
|---|---|---|---|---|---|
| Inconel 718 | Sheet | 0.5 - 6 | 1000 - 2000 | 1000 - 6000 | 4.1 - 49.2 |
| Inconel 718 | Plate | 6 - 200 | 1000 - 2500 | 2000 - 8000 | 49.2 - 1640 |
| Inconel 718 | Coil | 0.5 - 6 | 1000 - 2000 | Coil Length | 4.1 - 49.2 |
| Inconel 825 | Sheet | 0.5 - 6 | 1000 - 2000 | 1000 - 6000 | 4.2 - 50.4 |
| Inconel 825 | Plate | 6 - 150 | 1000 - 2500 | 2000 - 8000 | 50.4 - 1230 |
| Inconel 825 | Coil | 0.5 - 6 | 1000 - 2000 | Coil Length | 4.2 - 50.4 |
Common Types Of Sheets
Shim Sheet
Perforated Sheet
Chequered Plate
Coil
Strips
Foil
Hot Rolled Sheets
Cold Rolled Plate
Matt PVC Sheet
Frequently Asked Questions (FAQ)
What is Inconel 718 and 825?
Inconel 718 and 825 are nickel-based superalloys known for their high strength, excellent corrosion resistance, and ability to withstand extreme temperatures. They are widely used in aerospace, chemical, and marine applications.
What forms are available for Inconel 718/825?
Both Inconel 718 and 825 are available in Sheet, Plate, and Coil forms, with various thicknesses, widths, and lengths to suit different industrial requirements.
What are the typical applications of Inconel 718/825?
Common applications include gas turbines, aerospace components, chemical processing equipment, marine engineering, and high-temperature furnace components.
What standards do Inconel 718/825 sheets, plates, and coils comply with?
They comply with ASTM B443, B444, ASME SB443, SB444, and UNS N07718 (718) / N08825 (825) standards, ensuring high-quality and reliable performance.
What is the chemical composition of Inconel 718/825?
Inconel 718 contains 50-55% Ni, 17-21% Cr, 4.75-5.5% Nb+Ta, with small amounts of Mo, Ti, and Al. Inconel 825 contains 38-46% Ni, 19.5-23.5% Cr, 2.5-3.5% Mo, with Cu and small amounts of Ti and Al.
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