Inconel 718 Round Bars, Sheets and Plates: Sizes, Standards and Procurement Guide

Inconel 718 Round Bars Inconel 718 is a high-strength, precipitation-hardenable nickel-based superalloy used in aerospace, oil and gas, power generation and specialised industrial engineering. Its combination of mechanical strength, fatigue resistance and high-temperature performance makes it suitable for demanding applications.

Also known as Alloy 718, UNS N07718 and W.Nr. 2.4668, this material is available in different product forms depending on the manufacturing process, applicable specification and intended application.

For buyers and procurement teams, selecting the correct Inconel 718 product form, dimensions, material condition and specification is essential for ensuring that the supplied material meets the project requirements.

Inconel 718 Product Forms

Inconel 718 is manufactured in several product forms for different industrial requirements.

Common product forms include:

  • Inconel 718 round bars
  • Inconel 718 forged bars
  • Inconel 718 forgings
  • Inconel 718 plates
  • Inconel 718 sheets
  • Inconel 718 rings
  • Inconel 718 wire

The availability of a particular form, size and condition depends on the applicable specification and supplier.

1. Inconel 718 Round Bars

Inconel 718 round bars are used in the manufacture of high-strength machined components and specialised engineering parts.

Typical applications include:

  • Shafts and pins
  • High-strength fasteners
  • Studs and connectors
  • Precision-machined components
  • Selected aerospace and turbine components
  • Specialised industrial equipment

Round bars may be supplied in different diameters, lengths and material conditions according to the purchase specification.

How to Select the Correct Round Bar Size

Before ordering Inconel 718 round bars, buyers should confirm:

  1. Required diameter in millimetres or inches
  2. Required length
  3. Dimensional tolerances
  4. Material condition
  5. Applicable ASTM or AMS specification
  6. Required testing and documentation

For machining requirements, it is useful to share the finished component dimensions or engineering drawing.

2. Inconel 718 Sheets and Plates

Inconel 718 sheets and plates are used for selected fabricated, machined and engineered components.

Their selection depends on thickness, dimensions, manufacturing requirements and the applicable material standard.

Potential application areas include:

  • Specialised industrial components
  • Engineered assemblies
  • Machined plates and components
  • Selected high-temperature equipment
  • Aerospace-related fabricated components

Sheets and plates should not be treated as interchangeable product forms. Buyers should specify the required thickness, width, length, tolerances and applicable specification.

3. Inconel 718 Forgings and Rings

Forged Inconel 718 is used in demanding applications where the component design and manufacturing process require suitable mechanical properties and controlled material structure.

Typical application areas include:

  • Turbine discs
  • Rings
  • High-strength rotating components
  • Specialised aerospace parts
  • Heavy-duty engineering components

Forgings are generally procured against detailed technical requirements, including forging dimensions, heat treatment, testing and inspection.

Inconel 718 Sizes and Dimensional Requirements

There is no single universal size range applicable to every Inconel 718 product form.

Dimensions depend on the manufacturing route, product form, governing standard and supplier capability.

Product formImportant dimensions to specify
Round BarDiameter and length
Forged BarDiameter or cross-section and length
PlateThickness, width and length
SheetThickness, width and length
RingOutside diameter, inside diameter and height
WireDiameter and supplied length or coil form

For accurate procurement, buyers should provide dimensions in a consistent unit system and specify whether the dimensions are nominal, minimum or finished requirements.

Inconel 718 Weight Calculation for Round Bars

For preliminary estimation, the approximate weight of a solid cylindrical Inconel 718 round bar can be calculated using its diameter, length and material density.

Approximate formula:

Weight (kg) = 0.00657 × D² × L

Where:

  • D = Diameter in millimetres
  • L = Length in metres
  • Approximate density used = 8.19 g/cm³

This is an estimate based on nominal dimensions and assumed density. Actual weight may vary with the material specification, dimensional tolerances and supplied condition.

For other round bar materials, refer to the Manan Steel & Metals round bar weight chart. Confirm the density used before applying any weight chart to Inconel 718.

Inconel 718 Standards and Specifications

Inconel 718 is covered by different specifications depending on its product form and intended application.

Commonly referenced specifications include:

ASTM B637

ASTM B637 covers specified precipitation-hardening nickel alloy bars, forgings and forging stock. It is an important reference for applicable Inconel 718 product requirements.

AMS 5662

AMS 5662 is an aerospace material specification covering specified Inconel 718 product forms and material conditions.

AMS 5663

AMS 5663 covers specified solution-treated and precipitation-hardened Inconel 718 forms and conditions.

The buyer should verify the current revision, exact product form, dimensions and condition required by the purchase order. A specification applicable to one product form should not automatically be assumed to cover another.

For standards information, visit ASTM International. For alloy technical information, refer to Special Metals.

Inconel 718 Material Conditions and Heat Treatment

Inconel 718 is a precipitation-hardenable alloy. Its mechanical properties depend significantly on the heat-treatment condition.

Common processing stages include:

  • Solution treatment
  • Controlled cooling
  • Precipitation ageing

The exact procedure depends on the governing specification, product form and required properties.

When ordering, buyers should clearly state whether the material is required in a solution-treated condition, aged condition or another specified condition.

Do not assume that all Inconel 718 bars, plates and forgings have identical mechanical properties.

What Documents Should Buyers Request?

For critical engineering applications, documentation is an important part of material procurement.

Depending on the purchase specification, buyers may need to request:

  • Material Test Certificate (MTC)
  • Chemical composition report
  • Mechanical test results
  • Heat-treatment details
  • Hardness test results
  • Heat or batch identification
  • Dimensional inspection report
  • Required third-party inspection documents

The documentation requirements should be agreed before order confirmation.

Inconel 718 Buying Checklist for Industrial Procurement

Before placing an order, use the following checklist:

Procurement requirementDetails to confirm
GradeInconel 718 / Alloy 718
UNS designationN07718
Product formRound bar, plate, sheet, forging or ring
DimensionsDiameter, thickness, width and length
StandardApplicable ASTM or AMS specification
Material conditionSolution-treated or specified aged condition
TestingTensile, yield, elongation and hardness as required
DocumentationMTC and traceability requirements
ApplicationIntended operating environment
QuantityRequired weight or number of pieces

Providing complete information helps suppliers evaluate the enquiry and reduces the possibility of ordering an unsuitable product.

Common Procurement Mistakes to Avoid

1. Ordering Only by Alloy Name

Mentioning only Inconel 718 may not be sufficient. The product form, specification and material condition must also be stated.

2. Ignoring Heat-Treatment Condition

Mechanical properties depend on the specified condition. Always verify the required condition before ordering.

3. Confusing Product Standards

A standard for bars or forgings may not automatically apply to plates or sheets. Check the exact product-form requirements.

4. Not Confirming Testing Requirements

For critical components, confirm required chemical and mechanical test documentation before procurement.

5. Providing Incomplete Dimensions

Missing diameter, length, thickness or tolerance information can delay quotation and material evaluation.

Inconel 718 Supplier in India – Manan Steel & Metals

Manan Steel & Metals supplies specialty metals and alloy materials for industrial and engineering requirements.

Buyers looking for Inconel 718 can share their required grade, product form, dimensions, specification, condition and quantity for enquiry evaluation.

For round bar requirements, explore our round bar product range.

You can also refer to our round bar weight chart for preliminary weight calculations.

For pricing and material enquiries, visit the Manan Steel & Metals contact page.

Frequently Asked Questions About Inconel 718 Sizes and Procurement

1. What product forms are available in Inconel 718?

Inconel 718 is produced in product forms including round bars, forged bars, forgings, plates, sheets, rings and wire, depending on manufacturing capability and applicable specifications.

2. Which standard is used for Inconel 718 round bars?

ASTM B637 is a commonly referenced specification for applicable precipitation-hardening nickel alloy bars and forgings. Relevant aerospace specifications such as AMS 5662 may also apply, depending on the required form and condition.

3. What is the UNS number of Inconel 718?

The UNS designation for Inconel 718 is N07718.

4. Does Inconel 718 require heat treatment?

Inconel 718 is precipitation hardenable. Its final mechanical properties depend on the specified solution-treatment and ageing condition.

5. How is the weight of an Inconel 718 round bar calculated?

An approximate weight can be calculated using the round bar diameter, length and assumed material density. The formula in this article provides an estimate; actual weight should be verified against the supplied material and dimensions.

6. What information should I provide when requesting an Inconel 718 quotation?

Provide the grade, product form, dimensions, quantity, applicable standard, material condition and documentation requirements. A drawing can also help clarify specialised requirements.

Conclusion

Inconel 718 is a specialised nickel-based superalloy used in demanding aerospace, energy and industrial applications. Selecting the correct round bar, plate, sheet or forging requires careful attention to dimensions, material condition, applicable specifications and documentation.

A complete technical enquiry helps buyers and suppliers evaluate the material requirement accurately.

Contact Manan Steel & Metals for your Inconel 718 material enquiries.

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