Inconel 718 — UNS N07718 Technical Reference

Inconel 718 (N07718) is included here as a material reference. Specified processing and ageing develop high strength; it is not a general replacement for C-type corrosion alloys.

Scope: Numerical limits below apply only to the named source, product form and condition. They are not measured results, design allowable stresses or guarantees for every product with this UNS. Acceptance follows the purchase order and applicable design/product standards.

1. Selected Chemical Requirements

Basis: Selected alloy-identification data only; confirm the complete table against the exact ordered specification and edition. Values are mass %. This selected-element table does not replace the complete source table and footnotes.

Check required minor/combined elements, heat/product-analysis rules and footnotes in the ordered edition. An element not listed here does not imply zero content or absence of a standard requirement.

2. Mechanical Requirements and Delivery Condition

No single tensile/yield/elongation set is asserted as an alloy-wide minimum. Specify product standard, size, manufacturing route, heat treatment/ageing and test direction before selecting acceptance values. “NON-TUBULAR REFERENCE” identifies a reference scope, not a delivery or heat-treatment condition.

ASTM B983 covers specified high-strength seamless pipe/tube including this UNS. Verify the exact edition, processing/ageing branch and inspection requirements before quoting guaranteed values. B637 bar/forging data are not a pipe/tube acceptance basis.

3. Designation References

UNS N07718 is the material identifier used here. Cross-system names below are comparison candidates only. EN, JIS and GB/T grades can differ in chemistry, form, condition and testing; substitution requires a technical comparison and project-required approval.

These are recorded designation references, not a certification of equivalence. A dash means no confirmed entry is supplied. A common UNS number or commercial name does not establish branded origin.

4. Fabrication and Service Considerations

Specified processing and ageing develop high strength; it is not a general replacement for C-type corrosion alloys.

Fabrication and heat treatment depend on the actual alloy and product standard. Age-hardenable alloys are not always supplied as fully annealed corrosion-resistant products. Review welding, post-fabrication treatment and environmental cracking separately; high nickel is not blanket sour-service approval.

5. Product Standards and Ordering Basis

Use the named ASTM B product specification and its applicable general requirements. B163 is for condenser/heat-exchanger tube; B637 and B865 are bar/forging-related specifications, not general seamless pipe specifications. Verify grade coverage and edition before applying any alternative.

State grade/UNS, form, route, specification/edition, OD/wall/length, condition, examination and documents. ASME SA/SB acceptance and design-code permission require separate checks. EN 10204 type 3.1 is an inspection document, not independent product approval. Chemical and mechanical tests can use different heat/lot sampling bases.

6. Typical Applications

High-strength aerospace, power and qualified oil/gas components.

These are examples, not a service-envelope approval. Confirm medium, concentration, temperature, pressure, flow/stagnation, deposits, crevices, stress and fabrication condition.

7. Product Enquiries and Related Pages

Forms, sizes, availability and certification are confirmed in the written quotation. Send an enquiry with the actual specification and service requirements.

Reference review: 30 October 2026. Editions identify the sources used; they do not assert that all named editions remain active or that alternative standards have identical requirements.