Inconel 718 seamless pipes can handle a temperature range from cryogenic temperatures up to 1,300°F (700°C).
ASTM B983 Inconel 718 Seamless Pipe Manufacturer
We have been manufacturing premium Inconel 718 seamless (SMLS) pipes at Zhejiang Xintongda Special Steel (XTD) since 1985. This pipe is a high-strength, nickel-chromium alloy that is precipitation-hardened. It contains 50–55% nickel and 17–21% chromium, with niobium as the primary strengthening element and controlled additions of molybdenum. We produce every SMLS pipe in strict compliance with the ASTM B983/ ASME SB983 standard. Being one of the premier superalloys, it is preferred for its ability to maintain mechanical strength from cryogenic temperatures up to 1,300°F (700°C). It is known for its exceptional fatigue and creep resistance, and stability at elevated temperatures. This high-strength pipe is essential for gas turbine components, cryogenic tanks, and other applications explained further in detail. As a multiple international certified supplier we operate under strict quality management systems. We have an annual supply capacity of 25,000 tons. We deliver stock orders within one week, while production orders take 15-60 days. Our rigorous testing and certification guarantee that every Inconel 718 Seamless Nickel Alloy Pipe meets the highest industrial standards for performance in extreme environments.
We manufacture pipes that meet the following specifications:
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Standard
ASTM B983
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OD Range
6-457 mm
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Thickness
1-65 mm
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Length
≤ 18 m
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Technical Data
Technical Data
Nickel Alloy 718 Seamless Pipe Manufacturing Process
Our manufacturing process of Alloy 718 seamless pipe begins with high-quality nickel alloy billets. These billets go through hot extrusion followed by cold drawing or pilgering to achieve precise dimensions. We then perform solution annealing and pickling to enhance the surface finish, restore ductility and dissolve precipitates. Visit this page to learn about the detailed manufacturing process of our seamless pipes.
Characteristics of Seamless Inconel 718 Alloy Pipe
The following 3 features make Inconel 718 pipe a preferred choice in demanding industries:
- High-Temperature Strength: This pipe maintains its structural integrity and tensile strength even when exposed to extreme heat. This is because the unique chemical composition prevents softening or deformation at temperatures reaching 1,300°F.
- Corrosion and Creep Resistance: The Inconel 718 alloy pipe resists oxidation and chemical damage while preventing slow deformation under persistent mechanical stress. This protects the piping system during long-term exposure to harsh, high-pressure industrial environments.
- Precipitation Hardening: Specific heat treatments create internal particles that strengthen the metal matrix through age hardening. This provides significantly higher strength than conventional stainless steels and most nickel alloys.
ASTM B983 Inconel 718 Nickel Alloy Seamless Pipe Tolerance
The table below outlines the standard dimensional tolerances for Inconel 718 Nickel Alloy Seamless Pipe as specified by the ASTM B983 standard.
| Nominal Outside Diameter in. (mm) |
Outside Diameter in. (mm) |
Permissible Variations % of Thickness of Specified Nominal Wall |
% of Thickness of Specified Minimal Wall | |||
| Plus | Minus | Plus | Minus | Plus | Minus | |
| 1 (25) to 1.900 (48), incl | 0.015 (0.40) | 0.031 (0.79) | 16.0 | 12.5 | 28.5 | 0 |
| Over 1.900 (48) to 4 1/2 (114), incl | 0.031 (0.79) | 0.031 (0.79) | 16.0 | 12.5 | 28.5 | 0 |
| Over 4 1/2 (114) to 6 1/2 (165), incl | 0.047 (1.2) | 0.047 (1.2) | 16.0 | 12.5 | 28.5 | 0 |
| Over 6 1/2 (165) to 9 1/4 (235), incl | 0.062 (1.6) | 0.062 (1.6) | 16.0 | 12.5 | 28.5 | 0 |
| Over 9 1/4 (235) to 14 (356), incl | 0.120 (3.05) | 0.120 (3.05) | 16.0 | 12.5 | — | — |
| Over 14 (356) to 24 (610), incl | 0.20 (5.08) | 0.20 (5.08) | 16.0 | 12.5 | — | — |
Inconel 718 Pipe Equivalent Material
The equivalent designation for Inconel 718 pipe is UNS N07718. It is also known as Werkstoff Nr. 2.4668 and JIS NCF 718. These and other global equivalents are explained below in the table.
| GRADE | UNS | GB | JIS | ISO | DIN/EN | GOST | |
| ISC | NEW | ||||||
| Inconel 718 | N07718 | - | GH4169 | NCF718 | - | 2.4668 | - |
100% Certified Testing & Documentation
- EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% PMI
- Heat Treatment Charts
- Third-Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate (Impact Testing, Flattening, Flare, Bend, Hardness, Intergranular, Pitting Corrosion, Grain size, ET, UT, HT)
- Laboratory Test Certificate from the Government-Approved Lab
Inconel 718 Seamless Pipe Applications
Inconel 718 seamless pipe is used in the following demanding applications.
Gas Turbine Components
This pipe is used to transport high-pressure fuel and cooling air within the intense heat of turbine sections. It provides the necessary heat resistance to ensure the turbine operates efficiently without structural failure.
Cryogenic Storage Tanks
The Inconel 718 pipe serves as critical plumbing lines for transporting liquefied gases at extremely low temperatures. It remains tough and ductile rather than becoming brittle in freezing conditions.
Jet Engines
This Inconel 718 seamless (SMLS) pipe is used for turbine blades and disks, nozzle guide vanes, afterburners, and combustion chamber housings, where it handles massive thermal cycles. It ensures the engine remains safe and operational under the extreme stresses of commercial and military flight.
Liquid Fueled Rocket Motors and Components
The Inconel 718 nickel alloy pipe handles the flow of volatile propellants and oxidisers during the high-vibration environment of a launch. Its exceptional high temperature strength and fatigue resistance is important for the structural integrity of aerospace propulsion systems.
Fasteners and Instrumentation Parts
The pipe is used in nuclear support systems, instrumentation tubing, and structural components exposed to high radiation and pressure. It is chosen as it maintains its shape in the constant heat of fission.
Nuclear Fuel Element Spacers
The pipe is used to maintain the exact positioning of fuel rods inside a nuclear reactor core. It is chosen as it resists radiation damage and maintains its shape in the constant heat of fission.
Hot Extrusion Tooling
This pipe is used as a component in die assemblies that shape other metals at high temperatures. Its hardness ensures the tools do not deform while pressing hot steel or aluminium into shapes.
Down Hole Shafting and Strength Bolting
Alloy 718 pipe is used in downhole tooling housings, pressure-containing components, and high-strength tubing in sour service environments. It resists the corrosive salts and high pressures found in the most demanding oil and gas reservoirs.
Frequently Asked Questions
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What temperature range can Inconel 718 seamless pipes handle?
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Is Inconel 718 resistant to corrosion and oxidation?Inconel 625 pipe is a nickel-chromium-molybdenum superalloy (UNS N06625). It is constructed without a welded seam. It is known for its high strength, corrosion resistance, and exceptional performance at elevated temperatures.
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Is Inconel 718 suitable for high-pressure applications?Yes, Inconel 718 suits high-pressure uses due to its high strength and creep resistance.