Inconel 718 alloy
Inconel 718 is a high-strength, corrosion-resistant nickel-chromium alloy known for its excellent mechanical properties at elevated temperatures. It is commonly used in aerospace, oil and gas, and other high-stress applications.
What is the difference between Inconel X750 and 718 springs?
nconel X750 and Inconel 718 are both nickel-based superalloys, but they have different compositions and properties that make them suitable for different applications. Here’s a comparison of the two, particularly in the context of spring materials:
1. Composition:
Inconel 718: Contains nickel (50-55%), chromium (17-21%), iron (up to 19%), molybdenum (2.8-3.3%), and niobium (4.75-5.5%). It also has small amounts of other elements like titanium and aluminum.
Inconel X750: Contains nickel (70-75%), chromium (14-17%), iron (5-9%), and significant amounts of titanium (1-2.5%) and aluminum (0.2-0.6%). It is primarily used in high-temperature applications.
2. Mechanical Properties:
Inconel 718: Known for its high strength, excellent fatigue resistance, and good ductility, particularly at elevated temperatures. It can be heat-treated to enhance its properties.
Inconel X750: Offers high strength and oxidation resistance at elevated temperatures, but it has lower ductility compared to Inconel 718. It is often used in applications that require stability under high-temperature conditions.
3. Corrosion Resistance:
Inconel 718: Excellent corrosion resistance, particularly in acidic and saline environments, making it suitable for aerospace and oil and gas applications.
Inconel X750: Also offers good corrosion resistance but is more focused on high-temperature oxidation resistance rather than resistance to acidic environments.
4. Applications:
Inconel 718: Commonly used in aerospace components, gas turbines, and springs that operate in high-stress and corrosive environments.
Inconel X750: Primarily used in gas turbine engines, nuclear reactors, and other high-temperature applications where stability and strength are critical.
5. Heat Treatment:
Inconel 718: Can be age-hardened to improve strength and hardness through specific heat treatment processes.
Inconel X750: Typically used in the solution-annealed condition; aging is less common as it is designed for stability rather than hardening.
Parameter:
Chemical Properties of Inconel 718
Nickel (plus Cobalt) .......................................................50.00-55.00
Chromium......................................................................17.00-21.00
Iron .....................................................................................Balance
Niobium (plus Tantalum)....................................................4.75-5.50
Molybdenum .....................................................................2.80-3.30
Titanium.............................................................................0.65-1.15
Aluminum ..........................................................................0.20-0.80
Cobalt ...............................................................................1.00 max.
Carbon..............................................................................0.08 max.
Manganese .......................................................................0.35 max.
Silicon ...............................................................................0.35 max.
Phosphorus.....................................................................0.015 max.
Sulfur...............................................................................0.015 max.
Boron ..............................................................................0.006 max.
Copper..............................................................................0.30 max
| Density | 8.19g/cm³ | 0.296 lb/in³ |
| Melting point | 1260-1336 | 2437°F |
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Billet and bar for reforging | |
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Inconel series
| Steel grade | Inconel 600 | Inconel 601 | Inconel 625 | Inconel 718 | Inconel 725 | Inconel X-750 |
| Corresponding brand | N06600/2.4816/1Cr15Ni75Fe8/NS312/CY40 | N06601/2.4851/1Cr23Ni60Fe13AI/NS313 | N06625/2.4856/0Cr20Ni65Mo10bN4/NS336 | N07718/2.4668/GH4169 | N07725 | N07750/2.4669/GH4145 |
| Chemical composition% |
| C≤ | 0.150 | 0.100 | 0.100 | 0.080 | 0.030 | 0.080 |
| Mn≤ | 1.00 | 1.00 | 0.50 | 0.35 | 0.35 | 1.00 |
| P≤ | / | / | 0.015 | 0.015 | 0.015 | / |
| S≤ | 0.015 | 0.015 | 0.015 | 0.015 | 0.010 | 0.010 |
| Si≤ | 0.50 | 0.50 | 0.50 | 0.35 | 0.20 | 0.50 |
| Cr≤ | 14.0-17.0 | 21.0-25.0 | 20.0-23.0 | 17.0-21.0 | 19.0-22.5 | 14.0-17.0 |
| Ni≤ | ≥72.0 | 58.0-63.0 | ≥58.0 | 55.0-59.0 | 55.0-59.0 | ≥70 |
| Mo | / | / | 8.0-10.0 | 2.8-3.3 | 7.0-9.5 | / |
| Cu | ≤0.50 | ≤1.50 | / | ≤0.30 | / | ≤0.50 |
| N | / | / | / | | / | / |
| Nb | / | / | 3.15-4.15 | 4.75-5.50 | 2.75-4.00 | 0.70-1.20 |
| other | Fe:6.0-10.0 | Al:1.0-1.7 | Co:≤1.0Ai:≤0.40Tr:0.40Fe:≤5.0 | AI:0.20-0.80Ti:0.65-1.15B≤0.006 | Tr:1.0-1.7AI≤0.35 | Co:≤1.0 AI:0.4-1.0Tr:0.25-2.75Fe:5.0-9.0 |
Customize size as below
| Shape | Size(mm) |
| WIre | 0.5-7.5 |
| Rod/Bar | 8.0-200 |
| Strip | (0.5-2.5)*(5-180) |
| Tube | custom made |
| Plate | custom made |
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