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Nickel Alloy Grade Data Sheet

Inconel 718

Inconel 718 is a precipitation-hardenable nickel-iron-chromium alloy combining high strength, corrosion resistance and good fabrication characteristics over a wide temperature range. Niobium and molybdenum provide strong age-hardening and solid-solution-strengthening effects, while the relatively slow precipitation response gives Alloy 718 good resistance to post-weld cracking. It is widely specified for aerospace engines, gas turbines, oil and gas equipment, nuclear systems, high-strength fasteners, cryogenic components and other heavily loaded applications.

 

 

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Material Overview

Inconel 718 material profile

A concise grade introduction for buyers who need to confirm composition, properties, standards, available forms and suitable applications before sending an inquiry.

Engineering profile

Inconel 718 is a precipitation-hardenable nickel-iron-chromium alloy combining high strength, corrosion resistance and good fabrication characteristics over a wide temperature range. Niobium and molybdenum provide strong age-hardening and solid-solution-strengthening effects, while the relatively slow precipitation response gives Alloy 718 good resistance to post-weld cracking. It is widely specified for aerospace engines, gas turbines, oil and gas equipment, nuclear systems, high-strength fasteners, cryogenic components and other heavily loaded applications.

 

 

Inconel 718

Technical data on this page is for material selection reference. Final acceptance values should be confirmed by the purchase standard, heat treatment condition, product form, size and material test certificate.

Chemical Composition

Inconel 718 composition range

The following table shows common limiting composition values for Alloy 625 / UNS N06625. Actual product chemistry is reported by heat on the material test certificate.

Element Symbol Typical Requirement Role in Alloy 718
Nickel Ni 50.0-55.0 Forms the nickel-rich matrix and provides corrosion resistance and high-temperature stability.
Chromium Cr 17.0-21.0 Improves oxidation resistance and resistance to many corrosive environments.
Iron Fe Balance Forms a major part of the alloy matrix and supports strength and economic alloy balance.
Niobium + Tantalum Nb + Ta 4.75-5.50 Produces the primary age-hardening response and contributes to high strength.
Molybdenum Mo 2.80-3.30 Provides solid-solution strengthening and improves resistance to localized corrosion.
Titanium Ti 0.65-1.15 Supports precipitation hardening during the aging treatment.
Aluminum Al 0.20-0.80 Combines with titanium and nickel to form strengthening precipitates.
Cobalt Co 1.00 max Controlled residual or minor alloying element.
Carbon C 0.08 max Controlled to balance carbide formation, strength and fabrication performance.
Manganese Mn 0.35 max Controlled minor alloying and deoxidizing element.
Silicon Si 0.35 max Controlled minor element and deoxidizer.
Copper Cu 0.30 max Controlled residual element.
Phosphorus P 0.015 max Restricted impurity for consistent ductility and grain-boundary performance.
Sulfur S 0.015 max Restricted impurity for improved hot workability and material quality.
Boron B 0.006 max Controlled in small quantities to support grain-boundary strength.

 

 

Physical Properties

Key physical and thermal data

These values help customers compare density, thermal behavior, magnetic response and conductivity during early material selection.

Property Metric Value Imperial / Notes Condition
Density 8.19 g/cm3 0.296 lb/in3 Room temperature
Melting Range 1260-1336 °C 2300-2435 °F Typical range
Specific Heat Approx. 435 J/kg·°C Approx. 0.104 Btu/lb·°F Approx. 20 °C
Thermal Conductivity Approx. 11.4 W/m·°C Approx. 79 Btu·in/ft2·h·°F Approx. 20 °C
Electrical Resistivity Approx. 125 µΩ·cm Approx. 752 ohm-cmil/ft Approx. 20 °C
Modulus of Elasticity Approx. 200 GPa Approx. 29.0 x 103 ksi Room temperature
Mean Thermal Expansion Approx. 13.0 µm/m·°C Approx. 7.2 µin/in·°F 20-100 °C
Magnetic Permeability Approx. 1.001 Essentially non-magnetic Annealed, room temperature

 

 

Mechanical Properties

Room-temperature mechanical properties

Mechanical properties vary with product form, size, processing route and heat treatment. The table below summarizes commonly referenced nominal values for material selection.

Product Form / Condition Tensile Strength Yield Strength, 0.2% Elongation Hardness
Plate, sheet and strip – solution treated 860-1100 MPa 345-620 MPa 30% min Condition dependent
Plate and sheet – solution treated and aged 1275 MPa min 1035 MPa min 12% min Approx. 331 HB min
Rod and bar – solution treated 965 MPa min 485 MPa min 30% min By specification
Rod and bar – solution treated and aged 1275 MPa min 1035 MPa min 12% min Approx. 331 HB min
Seamless tube – solution treated 860 MPa min 415 MPa min 30% min By specification
Forgings and rings – solution treated and aged 1275 MPa min 1035 MPa min 12% min Approx. 331-444 HB

 

 

For pressure equipment, aerospace parts or project-specific acceptance, use the minimum requirements in the specified ASTM, ASME, AMS, EN or customer drawing rather than nominal values.

Standards & Specifications

Common Inconel 718 standards by product form

YSN128 can quote Alloy 625 products according to ASTM, ASME, AMS, EN, DIN, ISO or customer drawing requirements. Certificate scope can be matched to the purchase order.

Product Form Common Standards Typical Supply Item Certificate / Inspection
Plate, Sheet, Strip ASTM B670 / ASME SB670, AMS 5596, AMS 5597 Hot rolled plate, cold rolled sheet, strip and cut blanks EN10204 3.1, chemical analysis and mechanical testing
Rod and Bar ASTM B637 / ASME SB637, AMS 5662, AMS 5663, AMS 5664 Round bar, rod, machined bar and heat-treated stock MTC, heat-treatment record, PMI and dimensional inspection
Wire AMS 5832 and customer specifications Cold-drawn wire, coil, spool and straight-length wire Chemical, tensile, dimensional and surface inspection
Seamless Pipe & Tube ASTM B983 / ASME SB983, AMS 5589 Seamless pipe, pressure tube and high-strength tubular components Hydrostatic test, eddy-current test, dimensional inspection and MTC
Forgings and Rings ASTM B637 / ASME SB637, AMS 5662, AMS 5663, AMS 5664 Forged rings, discs, blocks, shafts and drawing-based forgings Heat-treatment record, ultrasonic testing, PMI and MTC
Fasteners ASTM F2281 and aerospace or customer specifications Bolts, studs, nuts, screws, washers and special fasteners Mechanical testing, hardness, PMI and dimensional inspection
Welding Products AWS A5.14 ERNiFeCr-2, AWS A5.11 ENiCrFe-2 Matching welding wire, bare electrodes and covered electrodes Chemical analysis, mill certificate and dimensional inspection

 

 

Available Product Forms

Inconel 718 supply range

Review available product forms, size ranges, standards and delivery options for this alloy.

Form Common Size Range Delivery Condition Typical Applications Page Link
Pipe & Tube OD 6-762 mm, wall thickness or schedule to specification Seamless or welded, solution treated, aged, pickled or bright annealed Oil and gas equipment, aerospace tubing, pressure systems and nuclear components View Pipe & Tube
Round Bar Diameter 3-600 mm, custom cut lengths available Hot rolled, forged, solution treated, aged, peeled or polished Turbine shafts, fasteners, valve parts and high-strength machined components View Round Bar
Sheet & Plate Thickness 0.5-150 mm, custom widths and lengths Hot rolled, cold rolled, solution treated, aged, pickled or polished Aerospace structures, engine parts, pressure vessels and cryogenic equipment View Sheet & Plate
Strip & Foil Thickness 0.02-5 mm, precision slit widths available Cold rolled, solution treated, aged, bright finished or coil supplied Bellows, diaphragms, seals, springs and precision formed components View Strip & Foil
Wire Diameter 0.1-20 mm, coil, spool or straight-length supply Cold drawn, solution treated, aged, bright or pickled Springs, wire forms, fasteners, screens and welding-product manufacture View Wire
Fasteners Standard and custom bolts, nuts, screws, studs and washers Solution treated and aged, machined, rolled thread or custom finished Aerospace engines, gas turbines, subsea equipment and nuclear systems View Fasteners
Fittings ASME, ANSI, EN and custom drawing dimensions Formed, forged or machined, solution treated and aged as specified High-pressure piping, subsea equipment and aerospace fluid systems View Fittings
Flanges ASME B16.5, ASME B16.47, API, EN and custom dimensions Forged, solution treated, aged, machined and inspected Oil and gas systems, pressure vessels, turbines and subsea connections View Flanges
Forgings Rings, discs, blocks and shafts up to 2500 mm or drawing requirements Open-die or closed-die forged, solution treated, aged and machined Turbine discs, engine parts, pressure components and oilfield equipment View Forgings
Welding Wire Diameter 0.8-4.0 mm, spool, coil or straight length Precision drawn, clean bright finish and controlled chemistry Joining Alloy 718, aerospace fabrication, repair welding and overlay applications View Welding Wire

 

 

Material Selection Guide

When to consider Inconel 718

This guide helps buyers connect service conditions with the typical advantage of Alloy 625. Final selection should consider medium concentration, temperature, pressure, fabrication, availability and budget.

Service Requirement Why Alloy 718 Helps Common Product Form Buyer Note
High-strength aerospace components Precipitation hardening provides high tensile, fatigue, creep and rupture strength. Bar, plate, forgings, fasteners and machined components Specify the AMS standard, heat treatment, grain requirements and inspection class.
Gas-turbine engine service Alloy 718 retains useful mechanical strength and oxidation resistance at elevated temperatures. Forged discs, shafts, rings, sheet and fasteners Confirm service temperature, fatigue life, creep requirements and thermal cycles.
Oil and gas equipment High strength and corrosion resistance support use in selected wellhead, completion and subsea applications. Bar, forgings, fasteners, flanges and machined parts Specify the required API, NACE or project-specific material condition.
Cryogenic high-strength service The nickel-rich matrix maintains useful strength and toughness at very low temperatures. Plate, bar, tube, forgings and fasteners Confirm the minimum design temperature and required impact testing.
Nuclear and power-generation hardware The alloy combines high strength, corrosion resistance and dimensional stability. Bar, forgings, springs, fasteners and custom components Provide the applicable nuclear standard and supplementary inspection requirements.
Complex welded assemblies The relatively slow age-hardening response provides better weldability than many high-strength superalloys. Sheet, plate, tube, fittings and welding wire Control joint cleanliness, heat input, filler metal and post-weld heat treatment.

 

 

Why Choose Us

Supply and quality support for Inconel 718

For ranking traffic, buyers need more than a data sheet. This section gives clear trust signals for procurement, engineering and quality teams.

STASTM / ASME / AMS / EN

Quotation can be matched to project standards and product form specifications.

MTEN10204 3.1 MTC

Heat number, chemistry, mechanical properties and inspection records can be supplied.

QCPMI & Inspection

PMI, UT, dimensional inspection, visual inspection and packing check are available.

CSCustom Size

Cutting, machining allowance, rough machining and drawing-based supply can be arranged.

EPExport Packing

Wooden case, bundle, waterproof protection and international shipping documents.

RFFast Technical Reply

Send grade, size, standard, quantity and destination for a practical quotation route.

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FAQ

Inconel 718 questions from buyers

Find practical answers about procurement, standards, fabrication and industrial applications.

Inconel 718 is widely used for aerospace engines, gas turbines, turbine discs, shafts, high-strength fasteners, oil and gas equipment, nuclear components, cryogenic systems and other heavily loaded parts.

Yes. UNS N07718 is the standardized UNS designation for Inconel 718. The alloy may also be identified as Alloy 718, Nickel Alloy 718, W.Nr. 2.4668 or NiCr19Fe19Nb5Mo3.

Alloy 718 is strengthened by solution heat treatment followed by controlled aging. Niobium is the principal age-hardening addition, while titanium, aluminum and molybdenum also contribute to its high strength and structural stability.

YSN128 can quote plate, sheet, strip, round bar, rod, wire, pipe, tube, forgings, rings, flanges, fittings, fasteners and welding wire. Heat treatment, cutting, machining allowance and drawing-based production can also be discussed.

Common specifications include ASTM B637 for bars and forgings, ASTM B670 for plate and sheet, ASTM B983 for seamless pipe and tube, AMS 5596, AMS 5597, AMS 5662, AMS 5663, AMS 5664, AMS 5589 and AMS 5832.

Yes. Alloy 718 has good weldability compared with many precipitation-hardened superalloys because its strengthening reaction occurs relatively slowly. Compatible filler metal such as ERNiFeCr-2 may be used, followed by the heat treatment required by the approved welding procedure.

Yes. Inconel 718 can be supplied solution treated, solution treated and aged, or in another specified condition. The required ASTM or AMS specification must be stated because the heat-treatment cycle directly affects grain structure and mechanical properties.

Please send the product form, dimensions, quantity, applicable ASTM, AMS or project standard, heat-treatment condition, mechanical requirements, inspection requirements, destination and service temperature. Drawings should be included for forgings, fasteners and machined components.

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