Inconel 718 (UNS N07718) is a precipitation-hardening nickel-chromium alloy. It features extremely high strength, excellent fatigue resistance and creep resistance in high temperatures and harsh environments, and is a key material in the fields of aviation, energy and chemical engineering. The core characteristics and advantages of Inconel 718 tubes:
1. Strengthened by adding niobium, molybdenum, titanium and aluminum, and Through aging heat treatment to precipitate γ "phase (Ni₃Nb) and γ '(Ni₃ (Al, Ti)), the strength is more than twice that of Inconel 600 (the tensile strength at room temperature can reach 1400Mpa+).
High-temperature strength, Maintaining high strength and creep resistance at 1200°F.
Anti-oxidation and anti-corrosion, Resistant to high-temperature oxidation (up to 980°C), resistant to acid and alkali corrosion (superior to stainless steel but weaker than Hastelloy).
Fatigue resistance, Excellent high-cycle / low-cycle fatigue performance, suitable for vibrating environments.
Weldability: It can be welded by TIG, electron beam welding, etc. After welding, aging treatment is required to restore strength.
Low-temperature toughness: It maintains good toughness even at -196°C in liquid nitrogen.
The Inconel 718 pipe complies with the standard ASTM B983. Inconel 718 tubing is a high-performance solution for extreme environments and is suitable for scenarios that require ultra-high strength, fatigue resistance and creep resistance below 650°C (such as aero engines and deep well drilling). Its aging hardening property brings significant advantages, but it also increases the complexity of processing and welding. When selecting the model, it is necessary to strictly evaluate the environmental corrosiveness, temperature range and processing feasibility.
Chemical Composition of Inconel 718
|
% |
Ni |
Cr |
Mo |
Nb+Ta |
C |
Mn |
Si |
P |
S |
|
Min |
50.0 |
17.0 |
2.8 |
4.75 |
- |
- |
- |
- |
- |
|
Max |
55.0 |
21.0 |
3.3 |
5.5 |
0.08 |
0.35 |
0.35 |
0.015 |
0.015 |
Physical Properties
|
Density |
8.24 g/cm³ |
|
Melting Point |
1260–1335 ℃ |
Applicable Standards
|
Bars |
ASTM B 637 |
|
Plates, Sheets, and Strips |
ASTM B 670/B 906 |
|
Seamless Pipes and Fittings |
ASTM B 983 |
Minimum Mechanical Properties at Room Temperature
|
Condition |
Tensile Strength Rm N/mm² |
Yield Strength Rp0.2 N/mm² |
Elongation A5 % |
Brinell Hardness HB |
|
Solution Treated |
965 |
550 |
30 |
≤ 363 |
Product Characteristics
1. Excellent machinability
2. High tensile strength, fatigue strength, creep resistance, and fracture toughness at 700°C
3. Superior oxidation resistance at 1000°C
4. Stable chemical properties at low temperatures
5. Good weldability
Microstructure
GH4169 alloy exhibits an austenitic structure. The precipitation-hardened Y" phase imparts excellent mechanical properties. The 8 phase formed at grain boundaries during heat treatment provides optimal plasticity.
Corrosion Resistance
Alloy 718 exhibits exceptional resistance to stress corrosion cracking and pitting corrosion in both high-temperature and low-temperature environments. Its oxidation resistance at elevated temperatures is particularly outstanding.
Application Fields
Due to its high-temperature strength at 700°C, excellent corrosion resistance, and machinability, it is widely applicable in various demanding scenarios.
1. Steam turbines
2. Liquid-fuel rockets
3. Cryogenic engineering
4. Acidic environments
5. Nuclear engineering
Packing
With plastic cap to protect both ends Plastic bag wrapped outside pipe Woven bag wrapped outside pipe All our products are packed, stored, transported according to the international regulation.
The tubes are wrapped with anti-rust paper and steel rings to prevent damage. Identification labels are tagged according to standard specification or customer's instructions. Special packing is available as per customer's requirement.
Plus, ply wooden box are available for special protection. Other kinds of packing can be offered if request.
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