Inconel 718 alloy bar price per kilogram commonly ranges from approximately USD 32 to 70 per kg for standard commercial-grade hot-finished or solution-treated bar. Forged, cold-drawn, precision-ground, age-hardened, aerospace-certified, tightly toleranced, or small-quantity bars may cost approximately USD 45 to 125 per kg or more. Inconel 718, also known as Alloy 718, UNS N07718, and W.Nr. 2.4668, is a precipitation-hardenable nickel-chromium-iron alloy used for gas turbine components, aircraft engine parts, high-strength fasteners, oil and gas equipment, cryogenic components, pump shafts, springs, pressure hardware, and other parts requiring high strength, fatigue resistance, creep resistance, corrosion resistance, and reliable performance at elevated temperatures. The final price depends on diameter, quantity, specification, melting route, heat-treatment condition, surface finish, dimensional tolerance, inspection scope, stock availability, processing requirements, and delivery schedule.
Inconel 718 is one of the most widely used precipitation-hardenable nickel alloys. Its broad industrial use and relatively good availability help make it more commercially accessible than some specialized high-temperature alloys. However, it remains a high-value material because it contains nickel, chromium, niobium, molybdenum, titanium, and aluminum and normally requires controlled melting, hot working, solution treatment, precipitation aging, mechanical testing, and detailed traceability.
The price per kilogram is not determined by chemical composition alone. Two Inconel 718 bars with the same diameter may have substantially different prices if one is ordinary commercial-grade solution-treated material and the other is double-vacuum-melted, AMS-certified, solution-treated and age-hardened aerospace bar.
Standard commercial bar may be produced for general industrial fasteners, oilfield parts, shafts, valves, and machining blanks. Aerospace-grade bar may require vacuum induction melting, vacuum arc remelting, tighter chemistry control, stricter grain-size requirements, ultrasonic inspection, mechanical testing, original mill certification, and complete lot traceability. These additional requirements create a significant price difference.
| Inconel 718 Bar Type | Reference Price per Kilogram | Typical Supply Condition |
|---|---|---|
| Commercial hot-rolled bar | USD 32–55/kg | Standard industrial machining blank with mill tolerance |
| Solution-treated bar | USD 35–65/kg | Material supplied for further machining or subsequent aging |
| Forged round bar | USD 40–82/kg | Large diameter or heavy-section machining blank |
| Cold-drawn bar | USD 45–88/kg | Small diameter with improved tolerance and surface quality |
| Precision-ground bar | USD 55–115/kg | Tight-tolerance shafts, fastener blanks, pins, and precision parts |
| Solution-treated and age-hardened bar | USD 48–100/kg | High-strength condition with controlled aging and mechanical testing |
| Aerospace-grade AMS bar | USD 60–125/kg or higher | Controlled melting, strict certification, testing, and full traceability |
These ranges are intended for purchasing budgets. They normally exclude international freight, import duty, taxes, anti-dumping duty, third-party inspection fees, and destination-country charges unless the quotation specifically states that these costs are included.
The direct answer is that standard commercial Inconel 718 alloy bar commonly costs approximately USD 32 to 70 per kg. Medium-diameter stock bars in a hot-finished or solution-treated condition normally fall within this range.
Bars supplied in a fully age-hardened condition, aerospace-grade AMS condition, precision-ground finish, special oilfield condition, or large custom-forged diameter may cost approximately USD 45 to 125 per kg or more. Very small quantities, unusual diameters, urgent production, extensive ultrasonic inspection, or special customer qualification can increase the price further.
| Purchasing Requirement | Budgetary Price | Commercial Explanation |
|---|---|---|
| Standard stock bar | USD 32–65/kg | Common diameter, normal length, standard industrial certificate |
| Stock bar cut into fixed lengths | USD 35–72/kg | Includes cutting, kerf loss, identification transfer, and repacking |
| Age-hardened bar | USD 48–100/kg | Includes aging cycles, hardness control, and mechanical-property verification |
| Aerospace-grade bar | USD 60–125/kg | Includes controlled melting, strict specifications, testing, and traceability |
| Large forged bar | USD 45–95/kg | Includes forging, solution treatment, rough turning, and possible UT |
| Precision-ground bar | USD 55–115/kg | Includes peeling, straightening, grinding, and detailed dimensional inspection |
An online price may refer to old stock, offcuts, one specific diameter, a minimum quantity, or material without the required AMS or ASTM certification. Some published prices cover only solution-treated bar and do not include the cost of final age hardening.
Before comparing quotations, buyers should confirm whether the quoted material has the same standard, heat treatment, melting route, diameter, length, tolerance, surface finish, mechanical properties, inspection level, and certificate scope.
Inconel 718 is commonly identified as UNS N07718 and W.Nr. 2.4668. It may also be called Alloy 718, Nickel Alloy 718, NiCr19NbMo, or nickel-chromium-iron-niobium superalloy. UNS N07718 is the most important international grade identifier and should appear on the purchase order, quotation, MTC, product marking, packing list, and inspection documents.
Alloy 718 should not be confused with Inconel 625, Inconel X-750, Alloy 706, or Inconel 725. These materials have different chemical compositions, heat-treatment responses, strength levels, corrosion behavior, and temperature capabilities.
| Designation | Meaning | Purchasing Note |
|---|---|---|
| Inconel 718 | Common trademark-style alloy name | Widely used on engineering drawings and RFQs |
| Alloy 718 | Generic commercial alloy description | Frequently used by mills and stockholders |
| UNS N07718 | Unified Numbering System designation | Primary international identification for purchasing and certification |
| W.Nr. 2.4668 | European material number | Common in European drawings and certificates |
| NiCr19NbMo | Composition-based designation | Highlights chromium, niobium, and molybdenum additions |
| Specification | General Product Coverage | Commercial Importance |
|---|---|---|
| ASTM B637 | Precipitation-hardening nickel alloy bar, forgings, and forging stock | Common industrial specification for Alloy 718 |
| ASME SB637 | ASME-adopted bar and forging specification | Frequently used for pressure and code-related equipment |
| AMS 5662 | Solution-treated bar, forgings, and rings | Frequently supplied for machining before final aging |
| AMS 5663 | Solution-treated and precipitation-hardened bar, forgings, and rings | Used where final high-strength properties are required |
| AMS 5664 | Alloy 718 bar, forgings, and rings in a specified high-temperature condition | Exact revision and condition must match the customer drawing |
| ISO 9723–9725 | International standards for nickel alloy bar and forging products | Used in selected international projects |
| DIN 17752–17754 | Nickel alloy bars, forgings, and related products | May appear on European or older technical documents |
Inconel 718 is a nickel-chromium-iron alloy strengthened mainly by niobium, titanium, and aluminum. Nickel and iron form the principal matrix. Chromium provides oxidation and corrosion resistance. Niobium plus tantalum, together with titanium and aluminum, enables precipitation hardening.
The primary strengthening phase in Alloy 718 is gamma double-prime, while gamma-prime provides additional strengthening. The relatively slow precipitation response of Alloy 718 contributes to its good weldability compared with several other precipitation-hardened nickel alloys.
| Element | Specified Range or Limit | Main Function |
|---|---|---|
| Nickel plus Cobalt | 50.00–55.00% | Forms the stable nickel-base matrix and supports corrosion resistance |
| Chromium | 17.00–21.00% | Improves oxidation resistance and resistance to many corrosive media |
| Iron | Balance | Major constituent of the alloy matrix |
| Niobium plus Tantalum | 4.75–5.50% | Primary contributor to gamma double-prime precipitation strengthening |
| Molybdenum | 2.80–3.30% | Provides solid-solution strengthening and supports corrosion resistance |
| Titanium | 0.65–1.15% | Supports precipitation hardening and high-temperature strength |
| Aluminum | 0.20–0.80% | Combines with nickel and titanium in strengthening precipitates |
| Cobalt | 1.00% maximum | Controlled within the nickel-plus-cobalt requirement |
| Carbon | 0.08% maximum | Affects carbide formation and grain-boundary behavior |
| Manganese | 0.35% maximum | Controlled minor element |
| Silicon | 0.35% maximum | Controlled residual and processing-related element |
| Phosphorus | 0.015% maximum | Controlled impurity |
| Sulfur | 0.015% maximum | Kept low to support hot workability and weld quality |
| Boron | 0.006% maximum | Controlled trace addition affecting grain-boundary properties |
| Copper | 0.30% maximum | Controlled residual element |
The supplier should provide the actual heat analysis on the MTC. The chemistry should comply with the required ASTM, ASME, AMS, API, or customer specification. Aerospace and critical oilfield applications may impose tighter requirements on trace elements than general commercial supply.
The heat number on the MTC should match the bar marking, label, cutting record, inspection report, and packing list. When a full bar is cut into several pieces, traceability should be transferred to every piece.
The main alloying elements influencing Inconel 718 cost are nickel, chromium, niobium, molybdenum, and titanium. Their market prices affect raw material cost, but their effect on processing and melting control is also important.
Nickel plus cobalt represents approximately 50% to 55% of Alloy 718. Nickel market movement therefore affects new production cost and supplier replacement value. However, finished Alloy 718 bar costs substantially more than its nickel content because it requires alloy melting, conversion, heat treatment, testing, and certification.
Chromium content is approximately 17% to 21%. Chromium supports oxidation and corrosion resistance. Its cost influence is generally lower than that of nickel or niobium, but its relatively high percentage still contributes significantly to the alloy surcharge.
Molybdenum content is approximately 2.8% to 3.3%. It contributes solid-solution strength and resistance to localized corrosion. Although Alloy 718 contains less molybdenum than Inconel 625, molybdenum remains an expensive alloying addition.
Niobium plus tantalum content is approximately 4.75% to 5.50%. This is one of the most important composition features of Alloy 718. Niobium drives gamma double-prime precipitation strengthening and is a major contributor to the alloy’s high strength.
Niobium content also increases melting and processing complexity. Segregation must be carefully controlled during ingot production, remelting, homogenization, and forging. Large Alloy 718 ingots and forgings require particularly careful process control.
Titanium and aluminum are used in smaller amounts, but they are essential to precipitation hardening. Their direct raw material cost is smaller than nickel or niobium, yet they influence heat-treatment response and final mechanical properties.
| Element | Typical Content | Relative Cost Influence | Main Performance Contribution |
|---|---|---|---|
| Nickel plus Cobalt | 50–55% | Very high | Base matrix, corrosion resistance, and thermal stability |
| Chromium | 17–21% | Medium to high | Oxidation and corrosion resistance |
| Molybdenum | 2.8–3.3% | High | Solid-solution strengthening and localized corrosion resistance |
| Niobium plus Tantalum | 4.75–5.50% | High | Primary precipitation strengthening and high mechanical strength |
| Titanium | 0.65–1.15% | Medium | Precipitation response and elevated-temperature properties |
| Aluminum | 0.20–0.80% | Lower direct cost, high technical value | Supports gamma-prime precipitation |
Medium-diameter Inconel 718 bars normally offer the most stable price per kilogram because they are widely produced and stocked. Small-diameter rods require more finishing per kilogram, while large-diameter bars may require custom forging, long heat-treatment cycles, rough machining, and ultrasonic inspection.
| Diameter Range | Reference Price per Kilogram | Typical Supply Route |
|---|---|---|
| 3–10 mm | USD 60–115/kg | Cold drawn, straightened, polished, or precision ground |
| 12–20 mm | USD 48–90/kg | Cold drawn, peeled, ground, or small hot-finished bar |
| 22–80 mm | USD 34–68/kg | Common hot-rolled, forged, or peeled stock bar |
| 85–150 mm | USD 38–75/kg | Hot-rolled or forged bar with controlled solution treatment |
| 160–300 mm | USD 45–90/kg | Forged, rough-turned, solution-treated, and frequently UT-tested |
| Above 300 mm | Custom quotation | Project-specific forging, homogenization, heat treatment, and inspection |
| Diameter | Approximate Weight per Meter | Purchasing Meaning |
|---|---|---|
| 20 mm | About 2.57 kg/m | Low total weight, but small-bar processing can raise the price per kg |
| 50 mm | About 16.1 kg/m | Common machining diameter with relatively stable availability |
| 100 mm | About 64.3 kg/m | Higher total material value and heavier cutting requirements |
| 200 mm | About 257 kg/m | Normally forged and may require UT, lifting, and special packing |
These weights are approximate and calculated using a nominal Alloy 718 density of about 8.19 g/cm³. Actual invoiced weight should be based on measured dimensions or scale weight.
A smaller bar normally has a lower total weight, but it may have a higher price per kilogram. Small precision rods require significant processing compared with the amount of finished material produced.
Small-diameter Alloy 718 may require multiple cold-drawing reductions, intermediate annealing, surface cleaning, straightening, polishing, centerless grinding, and repeated dimensional inspection. If the bar must be supplied in an age-hardened condition, final heat treatment and distortion control add further cost.
| Small-Bar Requirement | Price Effect |
|---|---|
| Multiple drawing passes | Adds tooling, lubrication, equipment time, and process control |
| Intermediate annealing | Adds furnace cycles and handling between drawing operations |
| Precision straightening | Requires controlled correction and final inspection |
| Centerless grinding | Adds finishing time and lowers material yield |
| Small purchase quantity | Raises unit cost because setup and certification costs are not diluted |
Large Alloy 718 bars generally require forging from a billet or remelted ingot. Niobium segregation, grain structure, forging reduction, and heat-treatment uniformity must be controlled carefully. Large bars may require multiple forging heats, homogenization, solution treatment, rough turning, UT, macrostructure examination, and extensive mechanical testing.
| Large-Bar Requirement | Price Effect |
|---|---|
| Large remelted ingot or billet | Raises production commitment and minimum order quantity |
| Multiple forging heats | Adds press time, furnace energy, labor, and process risk |
| Long heat-treatment cycle | Requires substantial furnace capacity and temperature uniformity |
| Rough turning | Removes scale and surface defects but reduces finished yield |
| Ultrasonic testing | Adds inspection cost and potential rejection risk |
| Grain-size and macrostructure control | Adds process qualification and laboratory examination |
The production route changes both the Inconel 718 bar price and its suitability for the final component. Hot-rolled bar is generally more economical, while forged and precision-ground bars carry additional processing cost.
Hot-rolled bar is commonly used for general machining blanks, bolts, shafts, and industrial components. It normally has standard mill tolerance and requires machining allowance to remove scale and dimensional variation.
Forged bar is widely used for aircraft engine components, gas turbine parts, oilfield tools, large fasteners, pressure hardware, and heavy-section machining blanks. Its price depends on ingot quality, melting route, forging ratio, grain-size requirements, solution treatment, rough machining, and UT acceptance level.
Cold-drawn bar provides improved dimensional accuracy and surface finish for small diameters. Cold work increases strength and hardness, but the final heat-treatment route must be controlled to obtain the required specification and mechanical properties.
Precision-ground bar is used for shafts, pins, fastener blanks, pump parts, tooling, and components requiring tight diameter, roundness, straightness, and surface-roughness limits. Ground material can reduce final machining time but usually has the highest material price per kilogram.
| Bar Condition | Reference Price | Main Advantage | Main Cost Addition |
|---|---|---|---|
| Hot rolled | USD 32–55/kg | Economical machining blank | Limited finishing and standard tolerance |
| Forged | USD 40–82/kg | Large diameters and controlled structural properties | Forging, reheating, heat treatment, rough turning, and UT |
| Cold drawn | USD 45–88/kg | Improved dimensional accuracy and surface quality | Drawing, intermediate annealing, and straightening |
| Peeled or turned | USD 36–68/kg | Cleaner surface and reduced machining allowance | Surface removal and dimensional control |
| Precision ground | USD 55–115/kg | Tight tolerance and smooth finish | Grinding, inspection, straightening, and protective packing |
Heat-treatment condition is one of the most important differences between Inconel 718 bar quotations. Alloy 718 is commonly supplied either in a solution-treated condition for later machining and aging or in a fully solution-treated and precipitation-hardened condition.
Solution-treated bar is softer and easier to machine than fully aged material. It is often purchased under specifications such as AMS 5662 when the component manufacturer plans to complete rough machining before final aging.
Solution-treated material normally has a lower purchase price than fully age-hardened bar. However, the buyer must include the later costs of aging, furnace certification, hardness inspection, mechanical testing, dimensional correction, and final inspection.
Age-hardened bar has much higher yield strength, tensile strength, hardness, fatigue performance, and creep resistance. It may be purchased under specifications such as AMS 5663 when final mechanical properties are required before delivery.
Aged Alloy 718 is more difficult to machine. Tool wear, cutting forces, heat generation, and machining time increase substantially. Purchasing fully aged bar may therefore reduce heat-treatment responsibility but increase machining cost.
A widely used heat-treatment route involves solution annealing followed by aging near 718°C, furnace cooling to approximately 621°C, holding for a total aging period, and then air cooling. Another route uses a higher solution temperature followed by a different aging cycle to obtain a particular balance of strength, impact properties, creep resistance, and rupture behavior.
The exact heat treatment should follow the required material specification and drawing. A supplier should not select a heat-treatment cycle only because it is cheaper or more convenient.
| Condition | Typical Commercial Use | Relative Material Price | Buyer Consideration |
|---|---|---|---|
| Solution treated | Rough machining before final aging | Lower | Buyer must arrange and control final heat treatment |
| Solution treated and aged | Finished high-strength component or machining blank | Higher | Higher hardness increases machining difficulty |
| Customer-specific aged condition | Aerospace, oilfield, turbine, or special fatigue application | Project-specific | May require qualification testing and furnace records |
The cheaper solution-treated bar is not always the lowest-cost option after final aging, testing, distortion correction, and regrinding are included. Similarly, fully aged bar may be unnecessarily expensive if extensive rough machining still has to be completed.
A common manufacturing approach is to purchase solution-treated stock, complete most rough machining, perform precipitation aging, and then finish-machine critical surfaces. The best route depends on component geometry, tolerance, production quantity, and heat-treatment capability.
Inconel 718 is widely stocked compared with many other nickel superalloys, especially in common aerospace and oilfield diameters. Stock material normally provides the lowest MOQ and shortest delivery time.
Stock bar can often be purchased by the full length or cut piece. The buyer may save money by selecting the next larger available diameter and machining it to final size. Existing stock also reduces exposure to future nickel price changes and new mill lead times.
Custom production may require new melting, remelting, billet conversion, forging, rolling, solution treatment, aging, rough machining, UT, mechanical testing, and special certification. Mills normally require an MOQ sufficient to cover the complete production batch and process losses.
| Comparison Item | Stock Size Bar | Custom Size Bar |
|---|---|---|
| Price per kilogram | Usually lower | Usually higher |
| MOQ | May allow one bar or several cut pieces | May require full mill, billet, or forging quantity |
| Lead time | Short after certificate approval | Longer because of production and inspection |
| Dimension flexibility | Limited to available inventory | Can be produced closer to the required machining size |
| Specification flexibility | Limited to original stock certification | Can be planned for a specific ASTM, AMS, API, or customer requirement |
An ASTM B637 stock bar cannot automatically be recertified to AMS 5663 simply by applying an aging treatment. The original melting route, forging process, heat treatment, test sampling, mechanical properties, and traceability must satisfy the required AMS specification.
The term “Inconel 718” identifies the alloy family, but it does not define the complete quality level. Aerospace-grade and commercial-grade Alloy 718 may have similar nominal chemistry while differing in melting route, inclusion cleanliness, grain structure, ultrasonic quality, traceability, heat treatment, testing, and approval status.
Commercial-grade bar is suitable for many industrial fasteners, shafts, valves, pump parts, tooling, general turbine hardware, and non-flight-critical components. It may be supplied to ASTM B637 or another industrial specification with standard MTC and mechanical testing.
Aerospace bar frequently requires vacuum induction melting followed by vacuum arc remelting, controlled forging practice, heat-lot traceability, strict grain-size requirements, ultrasonic testing, original mill certification, and compliance with a specific AMS revision.
Some buyers also require an approved mill source, frozen manufacturing route, statistical process control, additional macrostructure examination, or customer source inspection. These requirements can raise both price and lead time.
| Quality Requirement | Commercial-Grade Bar | Aerospace-Grade Bar |
|---|---|---|
| Typical price | Approximately USD 32–70/kg | Approximately USD 60–125/kg or higher |
| Common specification | ASTM B637 or project specification | AMS 5662, AMS 5663, AMS 5664, or customer aerospace specification |
| Melting route | Specification-dependent | Frequently VIM plus VAR or another controlled remelting route |
| Ultrasonic inspection | Standard or optional | Frequently mandatory with a defined acceptance class |
| Traceability | Heat-number traceability | Full heat, lot, process, and sometimes mill-source traceability |
| Testing | Standard chemistry and mechanical properties | Expanded mechanical, grain-size, macrostructure, UT, and process documentation |
Aerospace-grade material may provide no practical commercial advantage for a non-critical industrial shaft if ASTM B637 fully satisfies the design requirement. On the other hand, substituting commercial bar for an AMS-specified flight or turbine component can result in rejection and serious quality risk.
Value-added processing can represent a substantial part of the final Inconel 718 bar price. Buyers should separate the raw material price from cutting, machining, heat treatment, grinding, and testing charges.
Available surfaces may include hot-rolled black, descaled, pickled, peeled, rough turned, polished, or centerless ground. Each additional surface operation removes material, adds machine time, and reduces finished yield.
Standard mill tolerance is normally the lowest-cost option. Tight diameter tolerances such as h9, h8, h7, or customer-specific limits may require peeling, turning, cold drawing, or precision grinding.
Long shafts may require controlled straightness per meter. Precision rods may also require limits for ovality, roundness, and surface roughness. These requirements should be stated numerically in the RFQ.
Cutting charges include saw time, blade wear, kerf loss, length measurement, deburring, identification transfer, and repacking. Multiple short blanks normally have a higher effective price per kilogram than full-length bars.
Solution-treated Alloy 718 is easier to machine than aged Alloy 718, but it still work-hardens and generates considerable cutting heat. Age-hardened bar requires rigid equipment, sharp carbide tooling, controlled cutting speed, stable feed, and effective cooling.
Standard supply normally includes an MTC. Additional requirements may include PMI, UT, hardness testing, tensile testing, stress-rupture testing, grain-size examination, macrostructure testing, microstructure evaluation, or third-party inspection.
| Requirement | Lower-Cost Option | Higher-Cost Option |
|---|---|---|
| Surface condition | Hot rolled or descaled | Peeled, polished, or precision ground |
| Diameter tolerance | Standard mill tolerance | h9, h8, h7, or drawing-specific tolerance |
| Length | Random or full bar length | Multiple fixed lengths with tight tolerance |
| Bar ends | Standard saw cut | Faced, chamfered, deburred, or machined |
| Heat treatment | Solution-treated condition | Solution-treated, aged, tested, and dimensionally corrected |
| Inspection | Standard MTC and dimensional check | UT, grain size, macrostructure, mechanical testing, and third-party inspection |
Order quantity affects how cutting, inspection, certification, packing, and administrative costs are distributed. Small orders may carry a high unit price even when they are cut from stock.
Full bars or regular batch quantities normally receive better unit pricing than prototype pieces. Larger quantities allow suppliers to spread processing and documentation costs across more kilograms.
However, a large quantity that exceeds current inventory may require new production. The new-production portion may be priced differently from existing stock because of current raw material and mill conversion costs.
A stockholder may supply one short piece. A producing mill may require a complete billet, rolling batch, or forging batch. Custom aerospace-grade production may have a substantially higher MOQ because of melting, remelting, qualification, and testing requirements.
Ready stock provides the shortest lead time. New production may include melt scheduling, remelting, billet conversion, forging, heat treatment, UT, laboratory testing, certificate approval, and international transportation.
Urgent delivery may require priority production, subcontracted heat treatment, overtime inspection, express document approval, or air freight. These costs may exceed the difference between two material quotations.
Nickel, chromium, molybdenum, niobium, and titanium prices affect Alloy 718 replacement cost. Suppliers may limit quotation validity when raw material markets are volatile. A long fixed-price validity period may include an additional risk allowance.
| Commercial Factor | More Economical Situation | Higher-Cost Situation |
|---|---|---|
| Quantity | Full bars or regular production batches | Samples, prototypes, or several small pieces |
| MOQ | Suitable stock material is available | New mill, forging, or aerospace batch is required |
| Lead time | Normal processing and sea freight | Priority production and air shipment |
| Raw material market | Stable alloying-element prices | Rapidly increasing or volatile prices |
| Price validity | Short validity tied to current inventory | Long fixed validity requiring supplier risk coverage |
Inconel 718, Inconel 625, and Inconel X-750 are all nickel alloys, but they serve different performance priorities. Their prices overlap because condition, specification, diameter, and certification can be more important than alloy name alone.
| Alloy | Budgetary Standard Bar Price | Main Cost Reason | Main Performance Direction |
|---|---|---|---|
| Inconel 625 | About USD 30–60/kg | High nickel, chromium, molybdenum, and niobium content | Seawater, chlorides, chemical corrosion, offshore, and welded equipment |
| Inconel 718 | About USD 32–70/kg | Niobium-rich precipitation-hardening chemistry and heat-treatment requirements | High strength, fatigue, creep, aerospace, turbines, fasteners, and oilfield parts |
| Inconel X-750 | About USD 38–75/kg | High nickel content, age-hardening requirements, and lower availability in some sizes | High-temperature springs, bolts, turbine parts, and relaxation-resistant components |
Commercial-grade Alloy 718 and Alloy 625 bar prices frequently overlap. Inconel 625 contains more molybdenum but does not normally require precipitation hardening to develop its standard strength. Inconel 718 requires controlled solution treatment and aging but is widely produced and stocked.
Aerospace-grade Inconel 718 normally costs more than standard industrial Inconel 625 because of vacuum melting, remelting, AMS certification, UT, grain-size control, and mechanical testing.
Inconel 625 is normally selected when seawater, chlorides, pitting, crevice corrosion, or aggressive chemical media are dominant. Inconel 718 is normally selected when high yield strength, tensile strength, fatigue resistance, and creep performance are the main requirements.
Inconel 718 and X-750 prices can also overlap. X-750 may cost more in uncommon sizes because it is stocked less widely. Inconel 718 aerospace bar may cost more when strict AMS, melting, UT, and traceability requirements apply.
Inconel 718 generally provides higher mechanical strength in many applications up to approximately 650°C to 704°C. X-750 is widely used for high-temperature springs, bolts, and components requiring stress-relaxation resistance and oxidation resistance.
Choosing Inconel 625 for a highly stressed turbine fastener may not provide the strength required. Choosing aerospace-grade Inconel 718 for a simple seawater shaft may add cost without providing the most relevant corrosion advantage. Material selection should consider temperature, applied stress, fatigue cycles, corrosion medium, exposure time, manufacturing route, and design code.
How much is Inconel 718 alloy bar per kilogram?
Standard commercial Inconel 718 bar commonly costs approximately USD 32 to 70 per kg. Forged, cold-drawn, precision-ground, age-hardened, aerospace-grade, specially tested, or small-quantity bars may cost approximately USD 45 to 125 per kg or more. The final price depends on diameter, quantity, specification, melting route, heat treatment, tolerance, surface finish, inspection, stock availability, and delivery terms.
Why is aerospace-grade Inconel 718 more expensive?
Aerospace-grade Inconel 718 may require vacuum induction melting, vacuum arc remelting, controlled forging, strict heat treatment, grain-size control, ultrasonic inspection, mechanical testing, original mill certification, approved manufacturing sources, and complete lot traceability. These requirements increase production cost, inspection cost, rejection risk, and lead time compared with ordinary commercial-grade bar.
Is solution-treated or age-hardened Inconel 718 bar cheaper?
Solution-treated Inconel 718 bar usually has a lower initial price and is easier to machine. Age-hardened bar costs more because it requires additional furnace cycles, hardness control, and mechanical-property verification. However, solution-treated material still needs final aging after machining, so buyers should compare the total component cost, including heat treatment, dimensional correction, testing, and finish machining, rather than comparing only the initial bar price.
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