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Xi'an Dongmeng Group Co., Ltd. is one of the most reliable manufacturers and suppliers of nickel alloy 718 in China, also supports customized service. With abundant experience, we warmly welcome you to wholesale cheap products in stock here and get free sample from our factory. For price consultation, contact us.

Nickel Alloy 718 (UNS N07718) Bar, Plate & Seamless Tube

Specify the form, standard and heat treatment before you request a quote.

Xi'an Dongmeng Group Co., Ltd. supplies Nickel Alloy 718 for buyers sourcing high-strength nickel alloy bar, plate and seamless tube. Also known as Alloy 718 or INCONEL alloy 718, UNS N07718 is a precipitation-hardenable nickel-chromium alloy used for components that require strength at elevated temperatures. Its final properties depend on the product form, solution treatment, aging treatment and applicable specification.

Send us your drawing or purchase specification. We will review the required form, dimensions, delivery condition, inspection and documentation before preparing a quotation.

Request a Quote · Send a Drawing

Which Alloy 718 specification do you need?

"UNS N07718" identifies the alloy; it does not identify the finished product form or its required condition. Start with the drawing or project specification, then select the relevant material standard.

Product form	Specifications to discuss	Important purchasing distinction
Rod, bar, forgings and forging stock	ASTM B637 / ASME SB637, where applicable	Confirm section size, delivery condition and the mechanical tests required for that condition.
Plate, sheet and strip	ASTM B670 / ASME SB670, where applicable	ASTM B670 covers Alloy 718 flat products supplied in the annealed condition and specifies requirements relevant to subsequent precipitation hardening. ASTM B906 contains general flat-product requirements; it is not a substitute for B670.
Aerospace bar and forgings	SAE AMS 5662 or AMS 5663, according to the required condition	AMS 5662 describes solution-treated, precipitation-hardenable material; AMS 5663 is associated with solution and precipitation heat treatment. Confirm the revision specified by the buyer.
Aerospace flat products	SAE AMS 5596 or AMS 5597, as specified	The specified route and acceptance criteria must match the drawing and final heat-treatment plan.
Seamless tubing	SAE AMS 5589 or AMS 5590, as specified	These are seamless-tubing specifications with different solution-treatment routes. Do not apply them indiscriminately to welded tube or general-purpose pipe.

Need wire, welded tube or a finished component? Send the governing specification or drawing so the product route can be reviewed separately. Do not assume that a bar or seamless-tube specification covers another form.

Standard scope basis: ASTM's current B637 and B670 listings, ASTM B906, SAE material specifications and the alloy producer's technical bulletin.

Already have a specification? Send the standard, revision, condition, size and quantity for a more accurate quote.

Chemical composition of Nickel Alloy 718

The following limits are a reference alloy composition by weight, based on the alloy producer's published technical bulletin. For acceptance, use the chemical limits in the edition of the material specification named in your order and the results on the material certificate.

Element	Reference composition, wt.%
Nickel + cobalt	50.00–55.00
Chromium	17.00–21.00
Niobium + tantalum	4.75–5.50
Molybdenum	2.80–3.30
Titanium	0.65–1.15
Aluminum	0.20–0.80
Iron	Balance
Carbon	0.08 maximum

Niobium and tantalum are shown as a combined range; treating them as two independent 4.75–5.50% requirements would misstate the composition. Other controlled elements must also be checked against the ordered specification.

Solution treated or aged: choose the delivery condition first

Alloy 718 develops much of its high strength through precipitation hardening. Material ordered for forming, welding or substantial machining may require a different delivery condition from material ordered for use after final aging. The heat-treatment route must therefore appear on the RFQ, quotation, purchase order and certificate.

Requirement	Condition to discuss	Why it matters
Buyer will form or machine material before final heat treatment	Solution-treated material	Confirm who will perform the final aging treatment and which specification governs it.
Buyer requires specified aged properties on receipt	Solution treated and precipitation hardened	Quote against the applicable aged-condition standard and test requirements.
Heavy section, fatigue, rupture or impact requirements are critical	Drawing-specific heat-treatment route	Different solution and aging routes affect the balance of properties. Do not substitute one route based only on the alloy name.

Mechanical-property reference: The alloy producer publishes, for AMS 5596 sheet, strip and plate after its stated annealing and aging route, room-temperature minimums of 180 ksi (approximately 1,240 MPa) tensile strength, 150 ksi (approximately 1,030 MPa) 0.2% yield strength, and 12% elongation in 2 in. These are a condition-specific reference, not guaranteed values for every Alloy 718 bar, plate or tube order. The ordered standard, its revision, section and test condition control acceptance

Specify the dimensions that affect price and production

There is no useful single "standard size range" for an RFQ covering bar, flat products and tubing. Provide the dimensions for the form you need:

Form	Dimensions and details to send
Round bar	Diameter, length, tolerance, surface condition and whether further machining is planned
Forging stock	Starting section, cut length, forging drawing and required examination
Plate or sheet	Thickness, width, length, surface condition, edge condition and flatness requirements
Strip	Thickness, width, coil or cut-length requirement and edge condition
Seamless tube	Outside diameter, wall thickness, length, dimensional tolerance and end condition

For preliminary weight estimates, an annealed density of approximately 8.19 g/cm³ gives about 8.19 kg/m² per millimetre of plate thickness, or 0.00643 × diameter² kg/m for round bar when diameter is in millimetres. These are calculated estimates; final invoiced weight depends on actual dimensions and agreed terms. Density is derived from the alloy producer's published annealed value of 0.296 lb/in³.

Nickel Alloy 718 Product Forms and Sizes

Product form	Published size information	Dimensions to include in your RFQ	Applicable specification
Round bar	Ø12–80 mm (0.47–3.15 in) in a published project; other sizes subject to confirmation	Diameter, cut length, diameter tolerance, delivery condition	ASTM B637; AMS 5662 or AMS 5663
Forging stock / rings	Made to the agreed drawing; size subject to confirmation	Starting section, finished dimensions, machining allowance, drawing	ASTM B637 or applicable AMS specification
Plate	Size subject to quotation	Thickness × width × length; flatness and edge requirements	ASTM B670; AMS 5596 or AMS 5597
Sheet / strip	Size subject to quotation	Thickness × width × length, or coil requirements; edge condition	ASTM B670; AMS 5596 or AMS 5597
Seamless pipe / tube	Size subject to quotation	Outside diameter × wall thickness × length; tolerance and end condition	ASTM B983, AMS 5589 or AMS 5590, as applicable to the ordered condition

Table note for the website: The Ø12–80 mm bar figure describes a published project, not a guaranteed stock range. All dimensions, tolerances and delivery conditions are confirmed against the purchase specification before quotation.

Application and material-selection guidance

Alloy 718 is commonly considered for high-load fasteners, turbine and engine components, rings, casings and other parts whose design calls for a combination of elevated-temperature strength and corrosion resistance. The material specification alone does not qualify a finished component for aerospace, pressure equipment or oil-and-gas service; the drawing, processing route, testing and applicable project requirements must also be met.

Alloy 718 or Alloy 625? Start with the governing design requirement. Alloy 718 is a candidate when specified precipitation-hardened strength is central to the design. Alloy 625 is a separate alloy system often evaluated for corrosion-focused applications. Neither grade should be substituted for the other without reviewing the environment, required properties and project approval.

Sour-service projects: If the component will operate in an H₂S-containing environment, provide the service conditions and the required qualification standard with the RFQ. Selection and qualification under ISO 15156 depend on the actual environment and material condition; the label "Alloy 718" alone is insufficient.

Inspection, certification and traceability

State the required acceptance criteria before production or allocation. Depending on the order, the documentation package can be specified to include:

Heat number and material identification matched to the supplied pieces.

Chemical analysis and the relevant mechanical test results.

Heat-treatment condition and records where required.

Dimensional and visual inspection.

Ultrasonic or other nondestructive examination where required by the drawing or purchase specification.

The agreed mill test certificate and any separately requested third-party inspection.

Requirements such as EN 10204 3.1 documentation, additional testing or third-party witnessing should be confirmed in the quotation. Inspection methods, test coverage and certificate type must match the agreed supply route; they should not be assumed from the alloy grade alone.

Cutting, protection and shipment

If your project requires cut lengths, machining allowance, identified individual pieces, protected surfaces or specific export packing, include those requirements in the RFQ. For tube orders, specify whether end protection is required. Packing, marking and dispatch documents should identify the material and order consistently with the agreed traceability requirements.

Frequently asked questions

1. Is Nickel Alloy 718 the same as INCONEL alloy 718?

Alloy 718 commonly refers to UNS N07718. INCONEL is a registered trademark used by Special Metals. For procurement, specify the UNS grade and the product standard rather than relying on a trade name alone.

2. Which ASTM standard applies to Alloy 718 plate?

ASTM B670 is the relevant Alloy 718 plate, sheet and strip product specification. ASTM B906 sets general requirements for a group of flat-rolled nickel-alloy specifications and does not replace the individual product specification.

3. What is the difference between AMS 5662 and AMS 5663?

Both concern Alloy 718 bar and related wrought forms, but they identify different required delivery or heat-treatment conditions. Specify the exact standard revision and the condition shown on your drawing.

4. Do AMS 5589 and AMS 5590 cover all Alloy 718 pipe?

No. They describe specific seamless tubing routes. If your order calls for pressure pipe, welded tube or a different service code, send that requirement for a separate specification review.

5. Should I order Alloy 718 solution treated or aged?

That depends on what processing remains and which properties must be certified on delivery. Tell us whether you will form, weld, machine or heat-treat the material after receipt.

6. Can Alloy 718 be supplied for an H₂S-containing application?

The suitability decision requires the service environment, material condition and project qualification requirements. Include the applicable sour-service specification and required tests in your RFQ.

7. What sizes and tolerances are available?

Availability depends on form, condition, standard and quantity. Send your diameter or thickness, other dimensions, tolerances and required quantity so a compliant supply route can be checked.

8. Can material be supplied cut to length?

Include the cut length, length tolerance, quantity and any machining allowance in the request. The processing scope will be confirmed with the quotation.

9. Which inspection documents can I request?

Specify the certificate type, heat traceability, test reports and any third-party witnessing in your purchase requirements. Document availability and inspection scope should be confirmed before order placement.

10. What determines price and lead time?

Form, section size, specification, heat-treatment condition, testing, quantity, processing and packing all affect the quotation. A complete specification reduces clarification time and the risk of quoting the wrong condition.

11. What should I send for an accurate quotation?

Send the form, UNS grade, standard and revision, delivery condition, dimensions and tolerances, quantity, inspection documents, destination and required date. Attach a drawing for finished or tightly controlled parts.