# Nickel Superalloy Parts: Alloy 625 and Alloy 718

> Choose Alloy 625 or Alloy 718 for high-temperature metal parts. Compare corrosion resistance, age hardening, near-net shape, lead times, and quality certificates.

Canonical: https://mesh2metal.com/materials/nickel-alloys

__Specifications__
| Grades             | Alloy 625; Alloy 718                                                      |
| ------------------ | ------------------------------------------------------------------------- |
| Strength approach  | Solid-solution; precipitation-hardened                                    |
| Machined tolerance | ±0.1 mm Standard machined feature tolerance; ±0.05 mm precision available |
| As-built tolerance | ±0.5 mm                                                                   |

All specs (5)

| Part size | 800 × 800 × 600 mm maximum Larger on request |
| --------- | -------------------------------------------- |

Nickel superalloy parts in Alloy 625 and Alloy 718 suit high-temperature hardware that needs strength and oxidation resistance. Mesh2Metal supports quantities from 1 to 200, with parts made in under 1 day and delivered the next day up to 5 days depending on part size. The exact date comes with the instant quote.

## Why choose nickel alloys for high-temperature parts?

Nickel alloys retain useful strength at temperatures where many common metals lose capacity. Nickel alloys also offer strong oxidation resistance at high temperature, and selected grades help manage corrosion in hot, chemically demanding service. Those traits make nickel superalloy parts a fit when load, heat, and exposure matter at the same time.

Alloy 625 and Alloy 718 are both nickel-based options, but they solve different design priorities. Nickel superalloys are commonly known by trade names such as Inconel. Grade selection should follow the temperature range, applied load, corrosion exposure, geometry, and required condition rather than a familiar trade label.

## What is the difference between Alloy 625 and Alloy 718?

Alloy 625 and Alloy 718 differ mainly in how they develop strength and where that balance is useful.

| Design question            | Alloy 625                                                         | Alloy 718                                         |
| -------------------------- | ----------------------------------------------------------------- | ------------------------------------------------- |
| How is strength developed? | Solid-solution strengthening                                      | Precipitation-hardened structure                  |
| Main reason to select      | Corrosion resistance and oxidation resistance at high temperature | High strength after age hardening                 |
| Common application fit     | Hot sections and manifolds                                        | Combustion hardware and space propulsion hardware |
| Early design focus         | Corrosion exposure, temperature, and wall thickness               | Temperature, applied load, and final condition    |

Alloy 625 uses solid-solution strengthening and is often selected for corrosion resistance across demanding environments. Alloy 718 is precipitation-hardened and responds to age hardening, making it a strong candidate when higher load capacity is central to the design. Both grades need a review of temperature, wall thickness, interfaces, and the final machined condition.

## Where are nickel superalloy parts commonly used?

Nickel superalloy parts commonly appear in hot sections, combustion hardware, manifolds, and space propulsion hardware. Aerospace and space programs may use these grades for brackets, housings, ducts, supports, and other complex parts where heat and corrosion narrow the material choice. [Aerospace parts](https://mesh2metal.com/industries/aerospace) and [space hardware](https://mesh2metal.com/industries/space) benefit from early material and geometry review.

Hot-section designs often combine high temperature with pressure, vibration, or corrosive exposure. Alloy 625 can suit a design where corrosion resistance leads the decision. Alloy 718 can suit a design where strength after age hardening carries more weight. The correct choice depends on the actual duty cycle and the required final condition.

## Why does near-net shape help with nickel alloy machining?

Nickel alloys are hard to machine. Additive manufacturing lets complex parts be built near-net shape, which saves material and time before precision machining establishes critical dimensions. The sequence is simple: built near-net shape, precision machining, inspection, and a quality certificate.

Geometry should preserve practical access for precision machining, include enough allowance on features that need close tolerances, and identify surfaces that can remain as-built. Deep cavities, small openings, thin walls, and narrow internal passages deserve attention during the first review. The [manufacturability check](https://mesh2metal.com/manufacturability) can catch avoidable geometry issues before the [instant quote](https://mesh2metal.com/quote).

A near-net design is most useful when the part has complex internal geometry or when excess stock would create a large machining burden. The goal is not to remove every machining step. The goal is to reserve precision machining for the surfaces and dimensions that control fit, function, and inspection.

## What should engineers specify for nickel alloy parts?

Nickel alloy part designs should specify the grade, operating temperature, load direction, corrosion exposure, wall thickness, critical dimensions, and finish. A clear CAD model plus a short note about hot zones and interfaces helps the design review stay focused. [How it works](https://mesh2metal.com/how-it-works) explains the browser-based check, and the [lead-time guide](https://mesh2metal.com/lead-times) covers timing by part size.

Machined features are ±0.1 mm standard, with ±0.05 mm precision available. As-built surfaces are ±0.5 mm. Machined finish is Ra 3.2 µm standard, with 1.6 µm optional; as-built finish is Ra 12–25 µm. These values are starting points for design review, not substitutes for a part-specific requirement.

Parts up to 800 × 800 × 600 mm are supported, with larger parts considered on request. For a critical hot section or manifold, call out the surfaces that need precision machining and the surfaces that can remain as-built. That distinction helps keep the design aligned with the required function.

## What certificate comes with a nickel alloy part?

Every nickel alloy part ships with a quality certificate. The certificate records chemical composition, porosity and defect map, 3D deviation from CAD, mechanical properties, thermal properties, traceability, and certificate of conformance. That record connects the selected grade and final part to a reviewable quality package; see [quality documentation](https://mesh2metal.com/quality) for the certificate scope.

Inspection should be considered alongside the design, not after the part is complete. Clear critical features and a defined final condition make the certificate more useful to engineering, procurement, and quality teams.

## How can I check an Alloy 718 design fast?

Alloy 718 parts fast start with a clear material choice and a focused manufacturability check. Drop your CAD into the browser, review the instant verdict, and address any stated geometry issue before requesting the [quote](https://mesh2metal.com/quote). The check is designed for fast design iteration; [API access](https://mesh2metal.com/api) and [MCP access](https://mesh2metal.com/mcp) support teams that need repeated checks.

##  Grades

 Confirmed per quote

__Grades and nominal density__
| Grade     | Density    |
| --------- | ---------- |
| Alloy 625 | 8.44 g/cm³ |
| Alloy 718 | 8.19 g/cm³ |

## Questions

Can I request a single nickel alloy part?

Yes. Quantities range from 1 to 200 parts, with no tooling requirement.

Which CAD files can I check?

STL, STEP/STP, 3MF, and OBJ files are analyzed locally in the browser and never leave your device.

How fast can nickel alloy parts arrive?

Parts are made in under 1 day and delivered the next day up to 5 days depending on part size; the exact date comes with the instant quote.

Can I send export-controlled technical data?

Please don't send us export-controlled (ITAR/EAR) technical data until we have set up a compliant path with you — contact us first.

Sources (4)

1. \[1\] [ Machining ](https://en.wikipedia.org/wiki/Machining) , Wikipedia
2. \[2\] [ Additive manufacturing ](https://en.wikipedia.org/wiki/3D%5Fprinting) , Wikipedia
3. \[3\] [ Porosity ](https://en.wikipedia.org/wiki/Porosity) , Wikipedia
4. \[4\] [ Certificate of conformance ](https://en.wikipedia.org/wiki/Certificate%5Fof%5Fconformity) , Wikipedia

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