Inconel 718 Pipe Specifications: ASTM B983 vs AMS 5589 and AMS 5590
Inconel 718 pipe and tubing can be ordered under different specifications, but the standard number must match the actual product form, material condition and project requirements. ASTM B983, AMS 5589 and AMS 5590 all cover high-performance nickel-alloy tubular products, yet they do not define the same delivery condition and should not be treated as interchangeable.
Quick Answer
ASTM B983 covers high-strength seamless nickel-alloy pipe and tube and includes UNS N07718. AMS 5589 and AMS 5590 cover Inconel 718 seamless tubing under different solution heat-treatment requirements. The current AMS 5589H title specifies 1775°F (968°C) solution heat treatment, while AMS 5590G specifies 1950°F (1066°C).
The correct choice depends on the drawing, applicable design or aerospace specification, dimensions, required material condition and acceptance tests. A buyer should not replace one specification with another without written engineering approval.
ASTM B983 vs AMS 5589 vs AMS 5590
| Comparison point | ASTM B983 | AMS 5589H | AMS 5590G |
|---|---|---|---|
| Issuing organization | ASTM International | SAE International | SAE International |
| Product form | High-strength seamless pipe and tube | Inconel 718 seamless tubing | Inconel 718 seamless tubing |
| Alloy scope | Multiple listed nickel alloys, including UNS N07718 | Inconel 718 chemistry identified in the specification title | Inconel 718 chemistry identified in the specification title |
| Condition highlighted in the published scope or title | Cold-worked, cold-worked and precipitation-hardened, or solution-annealed plus precipitation-hardened conditions, as applicable | 1775°F (968°C) solution heat treated | 1950°F (1066°C) solution heat treated |
| Selection basis | Purchase order, project specification and applicable design requirements | Drawing and specified aerospace material condition | Drawing and specified aerospace material condition |
| Directly interchangeable? | No | No | No |
This table is a purchasing guide based on the publicly available scopes and titles. The purchased standard, specified revision and project documents govern the complete technical requirements.
What Specifications Apply to Inconel 718 Pipe and Tubing?
Inconel 718 is a precipitation-hardenable nickel-chromium alloy identified as UNS N07718 and W.Nr. 2.4668. The alloy name alone does not define the finished tubular product. A complete specification must identify whether the requirement is for pipe, precision tubing, mechanical tubing, a forged hollow or another product form.
Product-form distinctions matter because different specifications can impose different requirements for dimensions, processing, heat treatment, testing and certification. A bar specification is not automatically a pipe specification, and a forged hollow does not automatically comply with a seamless-tubing specification merely because both products use UNS N07718.
What Does ASTM B983 Cover?
ASTM B983 is titled Standard Specification for Precipitation Hardened or Cold Worked, Seamless Nickel Alloy Pipe and Tube. Its published scope includes UNS N07718 together with several other high-strength nickel alloys.
The standard addresses high-strength seamless pipe and tube supplied in specified cold-worked, precipitation-hardened or solution-annealed and precipitation-hardened conditions. Its published information also refers to chemical requirements, heat treatment, mechanical properties, sampling, inspection and certification. Each pipe or tube is tested by the manufacturer using either a hydrostatic test or a nondestructive electric test in accordance with the referenced general requirements.
Writing only “Inconel 718 pipe” on an inquiry is therefore incomplete. The purchase order should identify ASTM B983, the required revision, dimensions, material condition, tests and documentation.
What Is AMS 5589?
AMS 5589 is an SAE Aerospace Material Specification for corrosion- and heat-resistant Inconel 718 seamless tubing. The current AMS 5589H title identifies consumable-electrode-remelted or vacuum-induction-melted material and a 1775°F (968°C) solution heat treatment.
The published AMS 5589H scope covers seamless tubing with nominal outside diameter of 0.125 inch (3.18 mm) and over and nominal wall thickness of 0.015 inch (0.38 mm) and over. These scope dimensions do not establish supplier stock or guarantee that every size is available.
Older online references may show 1750°F for an earlier revision. Buyers should therefore state the required revision and should not combine requirements copied from different revisions.
What Is AMS 5590?
AMS 5590 also covers corrosion- and heat-resistant Inconel 718 seamless tubing. The current AMS 5590G title specifies a 1950°F (1066°C) solution heat treatment. Its published scope likewise covers tubing with nominal outside diameter of 0.125 inch (3.18 mm) and over and nominal wall thickness of 0.015 inch (0.38 mm) and over.
The most visible difference between AMS 5589 and AMS 5590 is the solution heat-treatment temperature stated in their titles. That difference is technically important because heat treatment affects the material condition and its response to subsequent processing and aging. It should not be reduced to a simple “higher temperature is better” comparison.
Why the Three Specifications Are Not Interchangeable
Different product scopes: ASTM B983 covers a group of high-strength seamless nickel-alloy pipe and tube products. AMS 5589 and AMS 5590 are Inconel 718 seamless-tubing specifications.
Different material conditions: ASTM B983 provides requirements for the applicable cold-worked or precipitation-hardened conditions, while the two AMS specifications identify different solution heat-treatment temperatures.
Different contractual requirements: A project drawing, aerospace specification, pressure-design basis or customer qualification may require one specific document and revision. Comparable chemistry does not authorize substitution.
Different acceptance details: Dimensions, tolerances, testing, sampling, certification and supplementary requirements must be reviewed in the complete ordered standard. A summary article cannot replace the controlled specification.
Pipe, Tube and Forged Hollow: What Should the Buyer Specify?
| Requested product | Dimensions to state | Important clarification |
|---|---|---|
| Seamless pipe | OD or nominal size, wall thickness or schedule, length and tolerances | Confirm the product specification and pressure-design requirements |
| Seamless tubing | Precise OD, wall thickness, length, straightness and tolerances | Confirm whether ASTM or AMS requirements control the order |
| Forged hollow or machined hollow | OD, ID, length, machining allowance and drawing dimensions | Confirm the manufacturing route and applicable forging or finished-product specification |
| Mechanical tubing | OD, ID or wall, length, tolerances and final machining needs | Do not assume a pressure-pipe or aerospace-tubing specification applies |
How to Choose the Correct Inconel 718 Pipe Specification
- Identify the product form. Confirm whether the requirement is pipe, seamless tubing, mechanical tubing or a forged hollow.
- Check the governing document. Review the drawing, project specification, code and customer-approved material list before selecting ASTM or AMS.
- Define the material condition. State the required solution treatment, precipitation-hardening condition and any subsequent heat treatment.
- State actual dimensions. Provide OD, ID or wall thickness, length, tolerances, straightness and machining allowance as applicable.
- Define inspection requirements. Specify chemistry, mechanical tests, hydrostatic or nondestructive testing, dimensional inspection and any third-party witnessing.
- Confirm documentation. State the required material certificate, heat-number traceability, heat-treatment records and inspection reports.
Testing and Documentation to Confirm
| Check | Purpose | What to define in the order |
|---|---|---|
| Material certificate | Records heat-specific chemistry and applicable test results | Certificate type, standard, revision and heat traceability |
| Mechanical testing | Verifies specified properties for the ordered condition | Test temperature, specimen requirements and acceptance criteria |
| Hydrostatic or NDT | Checks the tubular product under the specified method | Method, coverage, calibration and acceptance criteria |
| Dimensional inspection | Checks OD, ID, wall, length, straightness and other ordered dimensions | Drawing, tolerance basis and inspection-report requirement |
| Heat-treatment records | Supports verification of the specified material condition | Required cycle, record format and lot traceability |
PMI, hardness testing or an individual NDT method does not by itself prove full compliance with ASTM B983, AMS 5589 or AMS 5590. Acceptance must use the complete specification and purchase-order requirements.
Inconel 718 Pipe RFQ Checklist
- Material: Inconel 718 / UNS N07718 / W.Nr. 2.4668
- Product form: seamless pipe, seamless tubing, mechanical tubing or forged hollow
- Required standard and revision: ASTM B983, AMS 5589, AMS 5590 or project specification
- Outside diameter, inside diameter or wall thickness
- Length, dimensional tolerances, straightness and machining allowance
- Solution-treated, precipitation-hardened or other required condition
- Surface condition and end preparation
- Required mechanical, hydrostatic and nondestructive tests
- Material certificate, heat-treatment records and heat-number traceability
- Quantity, drawing, destination and required delivery date
For a technical review and quotation, send the required standard, dimensions, material condition, inspection scope and quantity with your enquiry.
Review Inconel 718 Forged Seamless Pipe | Send Your Inconel 718 Pipe RFQ
Frequently Asked Questions
What is the ASTM standard for Inconel 718 pipe?
ASTM B983 includes UNS N07718 within its scope for high-strength seamless nickel-alloy pipe and tube. The correct standard still depends on the product form, material condition, dimensions and project requirements.
What is the AMS specification for Inconel 718 tubing?
AMS 5589 and AMS 5590 are both SAE specifications for Inconel 718 seamless tubing. They specify different solution heat-treatment temperatures, so the drawing or purchase order must identify the required specification and revision.
What is AMS 5589?
AMS 5589H covers Inconel 718 seamless tubing and identifies a 1775°F (968°C) solution heat treatment in its current title. Older revisions may contain different title wording, which is why the revision must be stated.
What is the difference between AMS 5589 and AMS 5590?
The clearest published difference is the specified solution heat-treatment temperature: 1775°F (968°C) for AMS 5589H and 1950°F (1066°C) for AMS 5590G. Complete differences must be checked in the controlled standards.
Can ASTM B983, AMS 5589 and AMS 5590 be used interchangeably?
No. Their scopes, material-condition requirements and contractual uses differ. Any substitution requires review and written approval from the responsible engineering or purchasing authority.
Does an Inconel 718 forged hollow automatically meet ASTM B983?
No. The alloy grade and hollow shape alone do not establish compliance. The manufacturing route, finished dimensions, heat treatment, testing and certification must meet the ordered product specification.
What information is needed to quote Inconel 718 pipe?
Provide the grade, standard and revision, product form, OD, ID or wall thickness, length, tolerances, condition, quantity, inspection requirements, certificate type, destination and drawing where applicable.
Conclusion
Choosing an Inconel 718 tubular product starts with the product form and governing specification, not the alloy name alone. ASTM B983 provides a route for high-strength seamless nickel-alloy pipe and tube including UNS N07718. AMS 5589 and AMS 5590 address Inconel 718 seamless tubing under different solution heat-treatment requirements.
State the exact standard revision, dimensions, material condition, tests and documentation in the purchase order. This prevents unsuitable substitutions and allows the supplier to assess manufacturing feasibility and provide an order-specific quotation.
References
Post time: Oct-09-2026