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Inconel 718 and Inconel 825 Round Bars are high-performance nickel-based alloys known for their exceptional strength, corrosion resistance, and ability to withstand extreme temperatures. These alloys are widely used in aerospace, marine, chemical, and power generation industries. Both grades exhibit outstanding mechanical stability under high stress and thermal conditions. Their superior performance makes them ideal for demanding industrial environments.
Inconel 718 is primarily composed of nickel, chromium, and iron, with additions of niobium, molybdenum, titanium, and aluminum. This composition provides remarkable strength through precipitation hardening. Inconel 825, on the other hand, contains nickel, chromium, molybdenum, copper, and iron, designed for superior corrosion resistance. The combination of these elements ensures durability and long-term performance in corrosive and high-temperature conditions.
Inconel 718 Round Bars deliver exceptional tensile and yield strength, with tensile strength around 1300 MPa and yield strength near 1000 MPa. The alloy maintains toughness and fatigue resistance even at cryogenic and elevated temperatures. Inconel 825 offers slightly lower mechanical strength but excellent flexibility and ductility. Both alloys maintain dimensional stability and durability under extreme stress.
One of the major benefits of Inconel 718 and 825 Round Bars is their outstanding corrosion resistance. Inconel 718 performs exceptionally in oxidizing and reducing environments, while Inconel 825 resists acids such as sulfuric, phosphoric, and nitric acid. Both alloys are resistant to pitting, crevice corrosion, and stress-corrosion cracking, ensuring reliable performance in chemical and marine conditions.
Both Inconel 718 and 825 retain their mechanical strength and resistance to oxidation even at elevated temperatures. Inconel 718 is suitable for applications up to 700°C, while Inconel 825 maintains excellent stability up to 540°C. Their ability to withstand high heat and pressure makes them suitable for turbines, reactors, and exhaust systems. These properties ensure consistent performance in high-temperature operations.
Inconel 718 and 825 Round Bars are highly workable and can be fabricated through conventional machining, welding, and forming methods. Inconel 718 can be heat treated to enhance its strength, while Inconel 825 remains stable in the annealed condition. Both alloys can be cold or hot worked depending on the application requirement. Proper machining ensures high precision and surface finish in critical components.
Inconel 718 Round Bars are widely used in the aerospace industry for turbine discs, jet engine components, and fasteners due to their high strength and heat resistance. Inconel 825 is commonly used in power generation and nuclear industries where corrosion resistance is essential. Both alloys provide exceptional service life and stability under extreme operating conditions.
Inconel 825 Round Bars are particularly suitable for chemical processing equipment, heat exchangers, and piping systems that handle corrosive fluids. Their ability to resist acid attacks ensures safety and long-term reliability. In marine environments, both alloys perform exceptionally well against seawater corrosion, making them ideal for offshore platforms and marine hardware.
Specification Table
| Specification | Details |
|---|---|
| Standards | ASTM B637 / AMS 5662 / AMS 5663 (Inconel 718), ASTM B425 / ASTM B564 (Inconel 825) |
| Grades | Inconel 718, Inconel 825 |
| Diameter Range | 3 mm to 300 mm |
| Length | 100 mm to 6000 mm (Custom cut lengths available) |
| Tolerance | H9, H11, or as per customer requirement |
| Form | Round, Square, Hex, Flat, Forged, Bright, Black |
| Finish | Bright, Polish, Black, Rough Turned |
| Condition | Hot Rolled, Cold Drawn, Annealed, Solution Treated & Aged |
| Certification | EN 10204/3.1, NACE MR0175, Raw Material Test Certificate |
| Applications | Aerospace, Marine Engineering, Chemical Processing, Oil & Gas, Power Generation |
Chemical Composition (Typical ranges for SS718/825)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Percentage (%) |
|---|---|
| Nickel (Ni) | 50.0 – 55.0 |
| Chromium (Cr) | 17.0 – 21.0 |
| Iron (Fe) | Balance |
| Niobium + Tantalum (Nb + Ta) | 4.75 – 5.50 |
| Molybdenum (Mo) | 2.80 – 3.30 |
| Titanium (Ti) | 0.65 – 1.15 |
| Aluminium (Al) | 0.20 – 0.80 |
| Cobalt (Co) | 1.0 max |
| Manganese (Mn) | 0.35 max |
| Silicon (Si) | 0.35 max |
| Carbon (C) | 0.08 max |
| Sulfur (S) | 0.015 max |
Mechanical Properties (Typical)
| Property | Value | Condition |
|---|---|---|
| Tensile Strength | 1380 MPa (200 ksi) | Solution Treated & Aged |
| Yield Strength (0.2% Offset) | 1100 MPa (160 ksi) | Solution Treated & Aged |
| Elongation | 12% | Solution Treated & Aged |
| Reduction of Area | 17% | Solution Treated & Aged |
| Hardness | 331 HB max | Annealed |
| Density | 8.19 g/cm³ | — |
| Melting Range | 1260 – 1336 °C | — |
Equivalent 718/825s
| Standard | Grade | Description |
|---|---|---|
| UNS | N07718 | Nickel-Chromium Alloy |
| Werkstoff Nr. | 2.4668 | German Standard Number |
| EN | Alloy 718 | European Standard |
| ASTM | B637 | Specification for Nickel-Based Alloy Bars |
| AMS | 5662 / 5663 | Aerospace Material Specifications |
| Trade Name | Inconel® 718 | Registered Trademark of Special Metals |
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.
| Diameter (mm) | Diameter (inch) | Weight per meter (kg) | Weight per foot (lbs) |
|---|---|---|---|
| 6 | 0.236 | 0.21 | 0.14 |
| 8 | 0.315 | 0.36 | 0.24 |
| 10 | 0.394 | 0.56 | 0.38 |
| 12 | 0.472 | 0.79 | 0.53 |
| 16 | 0.630 | 1.39 | 0.94 |
| 20 | 0.787 | 2.18 | 1.47 |
| 25 | 0.984 | 3.40 | 2.31 |
| 30 | 1.181 | 4.90 | 3.31 |
| 40 | 1.575 | 8.70 | 5.88 |
| 50 | 1.969 | 13.60 | 9.19 |
| 60 | 2.362 | 19.50 | 13.18 |
Types Of 718/825 Round Bars and Tubes
Stainless Steel Round Bar
Monel 400 K400 Round Bar
Hastelloy Round Bar
Inconel 600 Round Bar
Nickel Alloy Round Bar
Super Duplex Round Bar
Monel K500 Round Bar
Inconel 625 Round Bar
Frequently Asked Questions (FAQ)
What are Inconel 718 and Inconel 825 round bars used for?
Inconel 718 and 825 round bars are used in high-temperature and corrosive environments such as aerospace engines, marine systems, chemical processing plants, and oil & gas applications due to their excellent strength and oxidation resistance.
What is the main difference between Inconel 718 and Inconel 825?
Inconel 718 is a precipitation-hardened alloy offering very high tensile and yield strength at elevated temperatures, while Inconel 825 is primarily known for superior corrosion resistance in acidic and marine environments. 718 is used more in aerospace, 825 more in chemical and marine industries.
What are the available sizes for Inconel 718 and 825 round bars?
They are typically available from 3 mm up to 300 mm diameter, with custom lengths up to 6000 mm. Special sizes and tolerances can be produced on request.
Are Inconel 718/825 round bars available in different finishes?
Yes, they are available in Bright, Black, Polish, and Rough Turned finishes, depending on application requirements.
What standards cover Inconel 718 and 825 round bars?
Inconel 718 is covered under ASTM B637 and AMS 5662/5663 standards, while Inconel 825 follows ASTM B425 and ASTM B564 specifications.
Do these bars come with mill test certificates?
Yes, both Inconel 718 and 825 round bars are supplied with EN 10204/3.1 or 3.2 certificates, including material traceability and chemical composition reports.
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