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Inconel 718 Bar and Rod
Round, hex, and forged sections to ASTM B637 in solution-treated and aged conditions.
View Inconel 718 Bar and Rod →Inconel 718 — UNS N07718 Alloy Data & Forms
Grade hub for UNS N07718 / W.Nr. 2.4668 — composition, aging, standards, and supply across three forms.
Aged Strength, One Hub
Composition, aging data, and standards for UNS N07718 are coordinated from a single Inconel 718 material page.
Audited Partner Plants
Melting, solution treating, and aging run at qualified mills already producing this grade at volume.
Heat-Level Traceability
EN 10204 3.1 certificates tie every bar, pipe, and plate delivery back to its melting heat.
MATERIAL OVERVIEW
About Inconel 718
Inconel 718 is supplied in UNS N07718 / Werkstoff 2.4668, a nickel-chromium-iron alloy hardened by niobium-bearing gamma-double-prime precipitation. Double aging lifts tensile strength toward 1275 MPa (185 ksi) while slow aging kinetics keep fabrication practical. Three ASTM forms are quoted from one coordinated source.
This page consolidates the grade data buyers check before ordering — composition, standards, and mechanical minimums by condition. Formed product is specified in detail on the Inconel 718 Bar and Rod, Inconel 718 Pipe and Tube, and Inconel 718 Sheet and Plate pages.
KEY FEATURES
Key Features of Inconel 718
Inconel 718 is a precipitation-hardenable nickel-chromium-iron grade covering bar, pipe and tube, and plate under the ASTM B637, B983, and B670 family. Double aging builds gamma-double-prime strength toward 1275 MPa (185 ksi) while slow aging kinetics keep fabrication practical. This page consolidates composition, standards, and mechanical minimums for UNS N07718, from cryogenic hardware at minus 253 °C to hot sections near 650 °C.
Inconel 718
Gamma-Double-Prime Hardening
Controlled double aging precipitates Ni₃Nb phase and raises yield strength past 1034 MPa (150 ksi).
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Strength Held to 650 °C
Yield strength stays near 860 MPa (125 ksi) at 650 °C, about double comparable solid-solution grades.
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Cryogenic Ductility
Toughness rises as temperature falls, so hardware serves reliably down to −253 °C.
03
Welding Without Strain-Age Cracking
Sluggish aging response allows joining in the solution-treated condition, unlike faster-hardening gamma-prime alloys.
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Fatigue and Creep Performance
Fine-grain product and stable precipitates carry cyclic loading in turbine hot sections.
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Sour-Service Readiness
Chemistry and hardness control support NACE MR0175 / ISO 15156 review for downhole duty.
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One Chemistry, Three Forms
B637, B983, and B670 share a single UNS N07718 composition window.
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ALLOY SELECTION
Why Choose Inconel 718
Inconel 718 is a precipitation-hardening grade, and strength therefore comes from the heat treatment rather than the chemistry alone. Double ageing precipitates Ni₃Nb and lifts yield strength beyond any solid-solution alternative. It enters the specification when strength, toughness, and weldability must hold together.
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Aging Carries the Design
Ageing belongs to the design, so section size and furnace schedule follow from the drawing.
02
Thick-Section Welding
In addition, slower hardening after welding lets heavy fabrications qualify in the solution-treated condition.
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Hot-Side Capacity
The grade keeps useful load capacity near 650 °C, which extends its reach into turbine and downhole hardware.
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Sour Duty Evidence
Hardness and chemistry control supply the documentation trail that NACE MR0175 / ISO 15156 review expects.
PRODUCT FORMS
Available Product Forms
Inconel 718 supply is organized by product form. Every form is specified in depth on its dedicated page.
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Inconel 718 Pipe and Tube
Seamless pipe and tube to ASTM B983 with aerospace AMS tube options.
View Inconel 718 Pipe and Tube →
03
Inconel 718 Sheet and Plate
Hot-rolled and cold-rolled plate, sheet, and strip to ASTM B670 in aged condition.
View Inconel 718 Sheet and Plate →
APPLICATIONS
Engineered For Demanding Industries
The grade appears wherever high strength, fatigue resistance, and corrosive media arrive together across a wide temperature span. Form selection usually follows the load path, section size, and fabrication route each project requires.
Discuss Your Application →
01
Aerospace Engine Hardware
Discs, shafts, casings, and duct components carrying cyclic load in hot sections.
02
Downhole Tools and Wellhead Equipment
HPHT tool bodies, hangers, and valves qualified against NACE MR0175 requirements.
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Gas Turbine Fasteners and Bolting
Aged bolting that holds preload from ambient to about 650 °C.
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Nuclear Reactor Components
Core hardware and drive mechanisms exposed to radiation and high-temperature water.
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Cryogenic Hardware
Rocket-engine turbopumps and liquefied-gas equipment operating near −253 °C.
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Chemical Processing Equipment
Reactor internals and valve trim where chloride media meet high mechanical load.
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Turbopump and Drive Shafts
High-cycle fatigue duty in pumps, compressors, and rotating assemblies.
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Pollution-Control Equipment
Scrubber internals where aged strength and chloride resistance are needed together.
TECHNICAL INFORMATION
Technical Specifications
Detailed technical information including chemical composition, mechanical properties, standards and available dimensions.
Chemical Composition
Limits below apply across the ASTM form family for UNS N07718. The governing purchase specification always takes precedence for final acceptance.
| Element | Content |
|---|---|
| Nickel (Ni) | 50.0–55.0% |
| Chromium (Cr) | 17.0–21.0% |
| Iron (Fe) | Balance |
| Niobium + Tantalum (Nb + Ta) | 4.75–5.50% |
| Molybdenum (Mo) | 2.80–3.30% |
| Titanium (Ti) | 0.65–1.15% |
| Aluminum (Al) | 0.20–0.80% |
| Cobalt (Co) | 1.00% max. |
| Carbon (C) | 0.08% max. |
| Manganese (Mn) | 0.35% max. |
| Silicon (Si) | 0.35% max. |
| Copper (Cu) | 0.30% max. |
| Phosphorus (P) | 0.015% max. |
| Sulfur (S) | 0.015% max. |
| Boron (B) | 0.006% max. |
Mechanical Properties
Minimum room-temperature values apply to precipitation-hardened product, because aging develops the full strength of the grade. Condition and thickness bands follow the governing standard.
| Product Form | Standard | Condition | Tensile Strength | Yield Strength, 0.2% Offset | Elongation |
|---|---|---|---|---|---|
| Bar and forgings | ASTM B637 | Solution treated + aged | ≥1275 MPa (185 ksi) | ≥1034 MPa (150 ksi) | ≥12% |
| Plate, sheet, and strip up to 25.4 mm | ASTM B670 | Solution treated + aged | ≥1241 MPa (180 ksi) | ≥1034 MPa (150 ksi) | ≥12% |
| Plate over 25.4 to 57.2 mm | ASTM B670 | Solution treated + aged | ≥1241 MPa (180 ksi) | ≥1034 MPa (150 ksi) | ≥10% |
| Seamless pipe and tube | ASTM B983 | Solution annealed + precipitation hardened | ≥1034 MPa (150 ksi) | ≥862 MPa (125 ksi) | ≥20% |
Aerospace AMS deliveries carry additional test requirements and condition-specific minimums. Confirm the required condition at inquiry so the correct standard is quoted.
Physical Properties
| Property | Value |
|---|---|
| Alloy | Inconel 718 |
| UNS | N07718 |
| Werkstoff | 2.4668 |
| Density | Approx. 8.19 g/cm³ |
| Melting Range | Approx. 1260–1336°C |
| Elastic Modulus | Approx. 200 GPa |
| Thermal Conductivity | Approx. 11.4 W/m·°C at 20 °C |
| Specific Heat | Approx. 435 J/kg·°C |
| Expansion Coefficient | 13.0 µm/m·°C (20–100 °C) |
| Typical Aged Hardness | 36–44 HRC |
| Alloy Type | Nickel-chromium-iron |
| Strengthening | Precipitation (Ni₃Nb) aging |
Standards
| Standard | Product / Application |
|---|---|
| ASTM B637 | Bar, forgings, and forging stock (aged) |
| ASTM B983 | Seamless pipe and tube (precipitation hardened) |
| ASTM B670 | Plate, sheet, and strip for elevated-temperature service |
| ASTM B906 / B829 | General requirements for flat-rolled and seamless product |
| ASME SB637 / SB983 / SB670 | Counterparts for pressure-code jurisdiction |
| SAE AMS 5662 / 5663 | Bar and forging stock, solution treated and aged |
| SAE AMS 5589 / 5590 | Seamless tube and hydraulic tubing |
| SAE AMS 5596 / 5597 | Sheet, strip, and plate |
| DIN 17751 / 17752 | European tube and bar standards, W.Nr. 2.4668 |
| ISO 6207 | Nickel alloy seamless tube |
| NACE MR0175 / ISO 15156 | Sour-service qualification (cited for reference) |
| API 6A | Wellhead and downhole equipment compliance |
Specifications are published by ASTM International, and the ASME counterparts apply wherever boiler and pressure-code compliance is required. NACE MR0175 / ISO 15156 qualification should be confirmed against the current edition for sour-service projects.
Dimensions
| Product Form | Typical Supply Range |
|---|---|
| Bar and rod | 3–300 mm dia. by section and condition |
| Seamless pipe | OD 6–219 mm, wall 0.5–15 mm |
| Hot-finished pipe | OD up to 610 mm, heavier wall |
| Plate and sheet | 0.25–57.2 mm thick, cut to length and width |
Available dimensions depend on the standard, heat-treatment condition, and order quantity. Confirm diameter, wall or thickness, and length at inquiry so the matching route is quoted.
Surface Finishes
| Surface Condition | Typical Characteristics / Applications |
|---|---|
| Solution Annealed & Pickled | Standard condition for forming and welding stock |
| Aged | Final high-strength condition after double aging |
| Bright / Ground | Machined or ground finish on bar and precision components |
| As-Worked | Hot-worked or cold-worked surface for further fabrication |
TECHNICAL DOCUMENTATION
Download Technical Datasheet
Get detailed information including specifications, standards, dimensions and material properties.
FAQ
Frequently Asked Questions
Which ASTM specification covers each Inconel 718 product form?
ASTM B637 covers bar and forgings, B983 seamless pipe and tube, and B670 plate, sheet, and strip. ASME counterparts apply under pressure-code jurisdiction.
What heat treatment develops full Inconel 718 strength?
Solution annealing near 940–1010 °C is followed by double aging — 718 °C for 8 hours, furnace cool to 621 °C, hold 8 hours, then air cool. Precipitated Ni₃Nb phase delivers the high yield strength.
Which welding filler is used for Inconel 718?
ERNiFeCr-2 filler to AWS A5.14 is standard for GTAW and GMAW. Joining proceeds in the solution-treated condition, with aging after fabrication where properties demand it.
How do solution-treated and aged conditions differ?
Solution-treated product is softer and shaped, machined, or welded before final heat treatment. Aged product carries the full 1275 MPa (185 ksi) class strength and is selected where service load governs.
What are the equivalent designations for Inconel 718?
UNS N07718, W.Nr. 2.4668, and EN NiCr19NbMo all designate the grade. Alloy 718 and GH4169 are common trade names for the same chemistry.
What is your MOQ for Inconel 718?
Single-piece orders are available in common sizes across every product form.
What are your trade terms for Inconel 718?
Quotations are issued FOB as standard, with EXW, CIF, and DAP available against confirmed destinations.
What is the lead time for Inconel 718?
Mill production for standard sizes runs 7-15 days, with aged-condition deliveries quoted against the confirmed heat-treatment schedule.
Do you provide EN 10204 3.1 or 3.2 certificates?
Yes — 3.1 mill test certificates are standard on every delivery, and 3.2 certificates with third-party endorsement can be arranged on request.
REQUEST FOR QUOTATION
Need A Custom Alloy Solution?
Send the grade, product form, condition, standard, size, and quantity, and your quotation covers Incoterm, lead time, and documentation scope. Heat-treatment condition questions can be attached to the same inquiry for engineering review.
