inconel 718 pipe
Inconel 718 seamless pipe
Application: Petroleum Machinery
Standard: SAE AMS5589
Delivery state: Solution treatment + precipitation hardening
Advantages: thick wall tube
Product Introduction
Introduction
Inconel 718 is a precipitation-hardenable nickel-chromium superalloy containing significant amounts of niobium, molybdenum, titanium, and aluminum. The alloy is designed to provide exceptional mechanical strength and outstanding resistance to oxidation and corrosion across a wide temperature range.
It maintains excellent mechanical properties from cryogenic temperatures (−253 °C) up to approximately 700 °C, making it one of the most widely used nickel-based superalloys in the aerospace, energy, and petrochemical industries.
Key advantages of Inconel 718 include high strength, good weldability, and excellent long-term structural stability at elevated temperatures.
Material Designations
Standard | Designation |
UNS | N07718 |
Werkstoff | 2.4668 |
AMS | AMS 5662 / AMS 5663 |
Alloy Name | Inconel 718 |
Applicable Standards
ASTM B163 – Seamless condenser and heat exchanger tubes
ASTM B167 – Seamless nickel alloy pipe and tube
ASTM B444 – Nickel alloy seamless pipe and tube
ASME SB163
Product Forms
Inconel 718 is available in multiple pipe and tube configurations:
Seamless pipes
Welded pipes
Cold-rolled tubing
Heat exchanger tubes
Chemical Composition (%)
Element | C | Mn | Si | P | S | Cr | Co | Mo | Nb + Ta | Ti | Al | Cu | B | Ni | Fe |
Content | ≤0.08 | ≤0.35 | ≤0.35 | ≤0.015 | ≤0.015 | 17 – 21 | ≤1.0 | 2.8 – 3.3 | 4.75 – 5.5 | 0.65 – 1.15 | 0.2 – 0.8 | ≤0.3 | ≤0.006 | 50 – 55 | Balance |
Mechanical Properties
Condition: Solution Treated + Precipitation Hardened
Property | Value |
Tensile Strength | ≥1275 MPa |
Yield Strength (0.2%) | ≥1034 MPa |
Elongation | ≥12% |
Reduction of Area | ≥15% |
Brinell Hardness | ≥331 HB |
Heat Treatment
Solution Treatment
Temperature: 924 – 1010 °C
Holding Time: ≥30 minutes
Cooling: Air cooling or faster
Precipitation Hardening
Heat to 718 °C ±14 °C, hold for 8 hours
Furnace cool to 621 °C ±14 °C
Continue aging until total aging time exceeds 18 hours
Air cool
This heat treatment process provides optimal strength, creep resistance, and structural stability.
Typical Sizes
Custom sizes are available. Examples of common dimensions:
OD (mm) | ID (mm) | Length (mm) |
162 | 105 | 6000 |
135 | 87 | 7246 |
153 | 115 | 7327 |
130 | 100 | 6000 |
95 | 35 | 6000 |
70 | 35 | 6000 |
Key Properties
High Temperature Strength
Inconel 718 retains excellent mechanical strength at temperatures up to 700 °C.
Corrosion Resistance
High nickel and chromium content provides excellent resistance to:
oxidation
carburization
sulfur-containing environments
aggressive chemical media
Good Weldability
Unlike many high-temperature superalloys, Inconel 718 can be welded without significant loss of mechanical properties.
Cryogenic Performance
The alloy maintains excellent toughness and ductility down to −253 °C.
Applications
Inconel 718 pipes and tubes are widely used in demanding industries:
Aerospace
turbine engines
rocket engines
aircraft structural components
Energy Industry
gas turbines
nuclear power systems
heat exchangers
Petrochemical Industry
high-pressure pipelines
chemical processing equipment
Defense & Advanced Engineering
missile components
high-temperature structural parts
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