What Are Inconel 718 Seamless Pipes?

Inconel 718 Seamless Pipes are high strength nickel-chromium alloy welded-free pipes that are produced without welded joints. These pipes are made using UNS N07718 (WNR 2.4668) material with outstanding tensile strength, fatigue and creep rupture resistance at high temperatures.

Unlike welded variants, an Inconel 718 Seamless Pipe is manufactured through hot extrusion followed by cold drawing, resulting in uniform grain structure and superior mechanical integrity. Alloy 718 Seamless Pipes are applied in various aerospace components, oil and gas processing systems, power generation plants, and high pressure chemical equipment by their superior strength and corrosion resistance.

Inconel 718 material has performance in harsh conditions such as high temperatures, oxidation, chloride exposure, and cyclic stress.

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Inconel 718 Seamless Pipe Specifications

Specification	Details
Material Grade	Inconel 718 (UNS N07718 / WNR 2.4668)
Primary Standards	ASTM B163 / ASME SB163, ASTM B407 / ASME SB407
Equivalent Specifications	AMS 5589 / AMS 5590
Seamless Size Range	15 NB to 150 NB
Wall Thickness (WT)	0.40 mm to 12.70 mm
Schedules	SCH 5, 10S, 10, 30, 40S, 40, 80, 80S, XS, 160, XXH
Length	Single Random, Double Random, Cut Lengths, and U-Tubes (up to 30 meters)
Manufacturing Process	Hot Extruded & Cold Drawn – Seamless
Dimensional Standards	ANSI/ASME B36.10 / B36.19

Chemical Composition of Alloy 718

Element	Composition
Nickel (Ni)	50–55%
Chromium (Cr)	17–21%
Iron (Fe)	Balance
Niobium (Nb + Ta)	4.75–5.50%
Molybdenum (Mo)	2.80–3.30%
Titanium (Ti)	0.65–1.15%
Aluminum (Al)	0.20–0.80%
Carbon (C)	0.08% max

Mechanical Properties of Inconel 718 Seamless Pipes

Property	Value
Tensile Strength	≥ 965 MPa
Yield Strength	≥ 550 MPa
Elongation	≥ 30%
Hardness	≤ 363 HB

These properties make Alloy 718 Seamless Pipes suitable for high-pressure service and cyclic loading applications.

Size Table of Alloy 718 Seamless Pipe

Parameter	Details
Product	Alloy 718 Seamless Pipe
Size	15 NB to 150 NB
Wall Thickness	0.5 mm to 20 mm

(Custom sizes available as per project requirements.)

Inconel 718 Seamless Tube Dimensions

Wall	Sizes (O.D.)
.010	1/16" , 1/8" , 3/16"
.020	1/16" , 1/8" , 3/16" , 1/4" , 5/16" , 3/8"
.012	1/8"
.016	1/8" , 3/16"
.028	1/8" , 3/16" , 1/4" , 5/16" , 3/8" , 1/2" , 3/4" , 1" , 1 1/2" , 2"
.035	1/8" , 3/16" , 1/4" , 5/16" , 3/8" , 7/16" , 1/2" , 16" , 5/8" , 3/4" , 7/8" , 1" , 1 1/4" , 1 1/2" , 1 5/8" , 2" , 2 1/4"
.049	3/16" , 1/4" , 5/16" , 3/8" , 1/2" , 16" , 5/8" , 3/4" , 7/8" , 1" , 1 1/8" , 1 1/4" , 1 1/2" , 1 5/8" , 2" , 2 1/4"
.065	1/4" , 5/16" , 3/8" , 1/2" , 16" , 5/8" , 3/4" , 7/8" , 1" , 1 1/4" , 1 1/2" , 1 5/8" , 1 3/4" , 2" , 2 1/2" , 3"
.083	1/4" , 3/8" , 1/2" , 5/8" , 3/4" , 7/8" , 1" , 1 1/4" , 1 1/2" , 1 5/8" , 1 7/8" , 2" , 2 1/2" , 3"
.095	1/2" , 5/8" , 1" , 1 1/4" , 1 1/2" , 2"
.109	1/2" , 3/4" , 1" , 1 1/4" , 1 1/2" , 2"
.120	1/2" , 5/8" , 3/4" , 7/8" , 1" , 1 1/4" , 1 1/2" , 2" , 2 1/4" , 2 1/2" , 3"
.125	3/4" , 1" , 1 1/4" , 1 1/2" , 2" , 3" , 3 1/4"
.134	1"
.250	3"
.375	3 1/2"

Alloy 718 Seamless Tubing Wall Thickness

Types of Inconel 718 Tube	Out Diameter (OD)	Wall Thickness	Length
NB Sizes (in stock)	1/8" ~ 8"	SCH 5 / SCH 10 / SCH 40 / SCH 80 / SCH 160	Upto 6 Meters
Inconel 718 Seamless Tube (Custom Sizes)	5.0mm ~ 203.2mm	As per requirement	Upto 6 Meters

Manufacturing Process of Inconel 718 Seamless Pipes

Inconel 718 Seamless Pipes are manufactured using hot extrusion followed by cold drawing or pilgering to achieve precise dimensional tolerances. The pipes undergo solution annealing and age hardening to enhance mechanical strength and creep resistance. Strict dimensional inspection and non-destructive testing ensure structural integrity and compliance with ASTM standards.

Inconel 718 Alloy Tubing Test Method

Destructive Testing (Tensile, Flattening, Flaring)
Non-Destructive Testing (Ultrasonic, Eddy Current)
Positive Material Identification (PMI)
Heat Treatment Records
Third-Party Inspection
Raw Material Certificates
Mill Test Certificates (MTC)
NACE Compliance (if required)
NABL Approved Laboratory Reports

Applications of Inconel 718 Seamless Pipes

Aerospace engine components
Gas turbine systems
Oil & gas drilling tools
Heat exchangers
High-pressure chemical processing equipment
Nuclear and power generation systems

Advantages of Inconel 718 Seamless Pipe

Superior fatigue resistance
Excellent creep rupture strength
High tensile strength at elevated temperatures
Outstanding oxidation and corrosion resistance
Reliable performance under cyclic stress

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