Inconel 718 (UNS N07718) Supplier | Bar, Tube, Plate - Hangbo Alloy
Date: 2024年11月18日 Categories: All Products、Inconel Views: 6535
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Premium Inconel 718 (UNS N07718) bar, tube, plate supplier. High-temperature nickel alloy for aerospace, chemical processing. ASTM/ASME compliant. Get quote.
INCONEL 718 (UNS N07718 / W.Nr. 2.4668) is a precipitation-hardenable nickel-chromium alloy containing significant amounts of iron, niobium, and molybdenum, along with lesser amounts of aluminum and titanium. It combines high strength and corrosion resistance with excellent weldability and resistance to post-weld cracking.
Standards for INCONEL 718 Products
- Plates/Sheets: ASTM B670, ASME SB-670, AMS 5596
- Round Bars/Forgings: ASTM B637, ASME SB-637, AMS 5662
- Seamless Tubes: ASTM B983, AMS 5589, AMS 5590
- Wires: AMS 5832
Excerpt:
Inconel 718 (UNS N07718) supplier — ASTM B637. High-strength Ni-Cr superalloy for aerospace, turbine disks, and cryogenic tanks. Exceptional weldability and creep-rupture strength up to 700°C.
Shanghai Hangbo Alloy Group is a leading manufacturer of high-performance Inconel 718. As the "workhorse" of the superalloy industry, Alloy 718 is engineered for components requiring high strength and stability under extreme thermal cycles, from cryogenic temperatures up to 1300°F (704°C).
Precise ASTM B637 Data Tables
Chemical Composition (ASTM B637 / UNS N07718)
| Element | Ni (+Co) | Cr | Fe | Nb (+Ta) | Mo | Ti | Al |
|---|---|---|---|---|---|---|---|
| Min (%) | 50.0 | 17.0 | Bal. | 4.75 | 2.80 | 0.65 | 0.20 |
| Max (%) | 55.0 | 21.0 | - | 5.50 | 3.30 | 1.15 | 0.80 |
Mechanical Properties (ASTM B637 - Solution Treated + Aged)
| Property | Typical Value (Min) |
|---|---|
| Tensile Strength | 1275 MPa (185 ksi) |
| Yield Strength (0.2% Offset) | 1034 MPa (150 ksi) |
| Elongation (in 2") | 12-15% |
| Hardness | 36-44 HRC |
Material Characteristics
- High Creep-Rupture Strength: Maintains exceptional structural integrity under high stress at temperatures up to 700°C.
- Superior Weldability: Unique aging kinetics allow welding without spontaneous hardening, preventing strain-age cracking.
- Corrosion & Oxidation Resistance: Excellent resistance to various corrosive media and high-temperature oxidation.
- Cryogenic Stability: Retains high toughness and ductility in liquid hydrogen and oxygen environments.
Common Applications of Inconel 718
- Aerospace: Turbine disks, blades, rocket engine components, and high-strength fasteners.
- Oil & Gas: Subsurface safety valves, high-strength bolts, and instrumentation parts for sour gas wells.
- Nuclear: Spacer grids, structural supports, and fuel element components.
- Power Generation: Land-based gas turbine components and high-temperature springs.
Pros & Cons of Alloy 718
| Pros | Cons |
|---|---|
| Excellent weldability and post-weld repair. | Complex heat treatment required for peak properties. |
| Highest strength among common superalloys. | High machining costs due to work hardening. |
| Versatile across wide temperature ranges. | Susceptible to Laves phase if poorly processed. |
Global Project Case: Liquid Fueled Rocket Engine Components
Scenario: A leading space exploration agency required high-strength casings for liquid-fueled rocket engines. The components needed to withstand the extreme thermal cycle from liquid hydrogen temperatures to combustion exhaust heat while maintaining zero leakage.
Solution: Hangbo Alloy supplied high-purity Inconel 718 forgings (AMS 5663) processed via VIM+ESR melting. The material provided the necessary fatigue life and oxidation resistance to ensure mission success under extreme pressure differentials.
Manufacturing and Testing
Our Inconel 718 products undergo a rigorous manufacturing process including VIM (Vacuum Induction Melting) and ESR (Electroslag Remelting) to ensure metallurgical purity. Precision hot rolling and forging are followed by controlled heat treatment: Solution Annealing at 980°C followed by a two-stage double aging process (720°C and 620°C) to optimize the precipitation of the gamma double-prime phase.
Comprehensive testing includes:
- Ultrasonic Inspection (AMS 2631 Class A1)
- High-Temperature Tensile Testing (650°C)
- Stress-Rupture Testing
- Grain Size Control (ASTM E112)
Frequently Asked Questions (FAQ)
1. Why is Inconel 718 called the "workhorse" of superalloys?
Due to its balanced combination of high strength, excellent weldability, and relatively easier fabricability compared to other Al-Ti hardened nickel alloys.
2. What is the difference between Inconel 718 and Inconel 625?
718 is a precipitation-hardened alloy designed for high strength, while 625 is a solid-solution strengthened alloy primarily optimized for corrosion resistance.
3. Can Inconel 718 be used in cryogenic applications?
Yes, it maintains excellent ductility and impact strength even at temperatures as low as -250°C, making it ideal for cryogenic fuel tanks.
4. Is post-weld heat treatment (PWHT) necessary for Inconel 718?
Yes, to realize the full strength of the weldment, the material should be solution annealed and aged after welding.
5. How does Hangbo Alloy ensure the quality of 718 forgings?
Through triple melting or VIM+ESR processes and strict ultrasonic testing to eliminate internal inclusions and segregations.
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