High strength
High tensile, fatigue, creep and rupture capability after the specified aging treatment.
Age-hardenable nickel-chromium superalloy
Inconel 718 Round Bar, Plate and Sheet
A precipitation-hardenable nickel alloy widely specified for high strength, fatigue resistance, creep performance and weldability in aerospace and energy components.
Representative product-form image. Confirm actual surface, dimensions and condition with the quotation.Material overview
Why industrial buyers specify Inconel 718
Alloy 718 develops strength through controlled solution treatment and aging. Niobium, titanium and aluminum form strengthening precipitates, while chromium, nickel and molybdenum contribute corrosion resistance and elevated-temperature performance.
Weldability
Noted for resistance to post-weld cracking compared with many other precipitation-hardened superalloys.
Condition sensitive
Mechanical properties depend strongly on solution and aging practice, section size and product specification.
Technical reference
Composition and purchasing data
Values below are published reference limits. The purchase order, applicable specification and mill test certificate control the supplied material.
Limiting chemical composition, weight %
| Element | Published limit |
|---|---|
| Nickel + cobalt | 50.00-55.00 |
| Chromium | 17.00-21.00 |
| Iron | Balance |
| Niobium + tantalum | 4.75-5.50 |
| Molybdenum | 2.80-3.30 |
| Titanium | 0.65-1.15 |
| Aluminum | 0.20-0.80 |
| Cobalt | 1.00 max |
| Carbon | 0.08 max |
| Manganese | 0.35 max |
| Silicon | 0.35 max |
| Copper | 0.30 max |
Key material facts
- Designation
- UNS N07718; W.Nr. 2.4668
- Density
- About 8.19 g/cm3, depending on condition
- Strengthening
- Solution treatment followed by precipitation aging; required condition must be stated on the RFQ.
- Temperature note
- Published reference use spans about -253 C to 704 C; actual design temperature depends on condition, loading and governing code.
- Common supply
- Round bar, forged bar, plate, sheet, strip and cut blanks
Technical reference: manufacturer technical bulletin. Typical data is for material selection only and is not a design guarantee.
Common specifications
Standards buyers frequently reference
Specification editions and permitted product forms change. Send the exact standard, revision and condition shown on your drawing or material list.
| Product or requirement | Common reference |
|---|---|
| Bar and forgings | ASTM B637 |
| Plate, sheet and strip | ASTM B670 |
| Sheet, strip and plate | AMS 5596 |
| Bar and forgings | AMS 5662 / AMS 5663 |
Availability is subject to grade, size, quantity, condition, certification and mill route. No standard listed here confirms stock.
Application areas
Where Inconel 718 is commonly evaluated
Final material selection belongs to the buyer's qualified engineer and must consider temperature, stress, fabrication, corrosion medium and governing code.
Aerospace engines
Turbine disks, rings, casings and formed sheet-metal components.
Rocket systems
Liquid-fueled rocket components and high-strength structures.
Fasteners
High-load bolts, fasteners and instrumentation components.
Energy equipment
Rotating and pressure components requiring strength plus corrosion resistance.
RFQ checklist
Information needed for an accurate quotation
Clear specifications shorten material matching and reduce repeated email clarification.
1. Grade and standard
Inconel 718, UNS N07718, ASTM/AMS/EN standard and required revision.
2. Product and dimensions
Round bar, forged bar, plate, sheet, strip and cut blanks. Include thickness, width, length, diameter and tolerances.
3. Condition
Mill annealed, solution treated or solution treated and aged to the cited specification
4. Quantity
Pieces, kilograms or total project quantity, plus any trial-order requirement.
5. Inspection
MTC type, chemistry, mechanical tests, NDT, dimensional report and third-party inspection.
6. Delivery
Destination country or port, required date, packing and Incoterm preference.
Fast alloy inquiry
Send your Inconel 718 size, quantity and destination.
We will review product form, specification, condition, certification and delivery requirements before preparing a targeted quotation.
Buyer questions
Inconel 718 FAQ
Quick answers for initial sourcing. Confirm critical engineering requirements against the governing specification.
Does Alloy 718 require heat treatment?
Yes for full precipitation-hardened strength. Buyers should specify the required solution and aging condition or the exact AMS/ASTM requirement.
Can Alloy 718 be supplied for machining?
It is commonly purchased as bar or cut blanks. Machining allowance, condition, ultrasonic testing and grain-flow requirements should be stated.
Why can two Alloy 718 quotes differ?
Product form, melt route, heat treatment, testing, aerospace approvals, dimensions and certification requirements can materially change cost and lead time.
Related grades
Compare other core alloy pages
Use related pages to compare alloy families before sending your final material requirement.