ASTM B637 Inconel 718 Round Bar (UNS N07718 / 2.4668) | Aerospace-Grade, Full Range Stock & Mill-Direct Supply

As a mill‑direct supplier holding full‑range stock of aerospace‑grade material, we provide ASTM B637 Inconel 718 (UNS N07718 / W.Nr 2.4668) nickel alloy bar, rod and forging stock. ASTM B637 governs hot‑worked and cold‑worked precipitation‑hardenable nickel‑iron‑chromium superalloy bar products for moderate‑to‑high‑temperature service, widely ordered by aerospace component manufacturers, oil‑gas tool fabricators and energy equipment workshops

Different from AMS 5662 which focuses on aerospace melting specification, ASTM B637 defines bar product general technical requirements: chemical limits, room‑temperature mechanical requirements, sampling rules, stress‑rupture test criteria and mandatory lot‑by‑lot documentation rules for commercial and aerospace‑quality bar stock. This precipitation‑hardening alloy gains high strength via γ″ / γ′ phases after controlled aging heat‑treatment. It delivers balanced strength, creep‑rupture resistance and moderate corrosion performance from cryogenic‑253 ℃ up to 704 ℃. Our stock covers multiple diameters, surface finishes and melting options including air‑melt and premium VIM‑VAR double‑remelted grades.

Our exclusive supply highlights for ASTM B637 material：Mill‑direct supply | Full‑range stock availability | UT ultrasonic inspection option | Custom sizes service | Fast delivery | EN10204‑3.1 /3.2 MTR & PMI report | Third‑party witness inspection

Applicable Standards：ASTM B637 / ASME SB637, UNS N07718, W.Nr 2.4668;Compatible supplementary specs: AMS 5662 / AMS 5663 for higher aerospace melting requirements.

 

Available Product Forms (Full Supply Range)

 

We support all mainstream processable forms of ASTM B637 Inconel 718 UNS N07718 2.4668 with full-range in-stock specifications, enabling one-stop procurement for diverse industrial and aerospace project needs. Complete product categories are listed in the table below:

 

Product Category	Available Specifications & Types	Product Image
Bar Series	Round bar, hex bar, flat bar, square baASTM B637 Aerospace-Grade Inconel 718 UNS N07718 2.4668 r, hollow bar, billet, forging stock (solution annealed / aged heat treatment)
Plate & Sheet	Hot-rolled plate, cold-rolled sheet, thin plate, thick plate, polished plate
Pipe & Tube	Seamless pipe, precision capillary tube, hollow tube, industrial fluid pipe
Wire	Fine wire, welding wire
Strip	Cold-rolled strip, thin belt, precision shim strip
Custom Forgings & Machined Parts	Custom forgings, flanges, fasteners, bolts, studs, and non-standard machined components

 

ASTM B637 vs AMS 5662 Inconel 718

Both ASTM B637 and AMS 5662 are specifications associated with Alloy 718 bar and related product forms, but they are not simply interchangeable specifications.

Haynes lists AMS 5662, AMS 5663, AMS 5664 and SB 637/B637 for HAYNES 718 billet, rod and bar, as well as forgings.

For aerospace procurement, the correct specification should be determined by the drawing, material callout, required heat treatment, testing requirements and customer approval.

Related product: [AMS 5662 Inconel 718 Round Bar]

Quick selection guidance：

• Choose ASTM B637 Inconel718 as your base product specification for most commercial aerospace and oil‑gas projects. Add AMS 5662 as supplementary requirement only if your drawing requires aerospace‑grade melting and higher purity. 
• Do not confuse product standard(ASTM B637) with melting specification(AMS series).

Many buyers encounter practical sourcing and production obstacles when purchasing Inconel 718 superalloy bar：

• Confusion over different specifications: Engineers mix‑up ASTM B637 product‑spec and AMS melting‑spec, leading to wrong material acceptance criteria and rejected batches. ASTM B637 covers bar product requirements, while AMS adds extra melting and purity constraints for flight‑critical hardware.
• Stock shortage & long lead‑time: Many suppliers only offer custom production without ready stock, causing multi‑month delays for prototype and urgent aerospace / oil‑gas project orders.
• Internal material defects risk for high‑stress parts: Non‑ultrasonic‑tested bar may contain internal inclusions, leading to early fatigue fracture of rotating aerospace or downhole components.
• Unclear documentation compliance: Projects require lot‑traceable reports; generic MTR without ASTM B637 clause validation cannot pass third‑party audit.
• Post‑processing limitation: If material arrives in fully aged hard condition, complex CNC machining becomes extremely slow with heavy tool wear.

How our mill‑direct ASTM B637 Inconel718 bar solves above procurement pain‑points：

• Clear specification boundary: Our material complies strictly with ASTM B637 bar‑product standard. We can additionally execute AMS 5662 /5663 supplementary requirements if your drawing demands aerospace melting rules.
• Full‑range mill‑direct stock: Wide diameter inventory shortens lead‑time for prototype and urgent orders, avoid long custom‑production cycle.
• Optional UT ultrasonic inspection: We provide UT testing per ASTM A388 for high‑stress rotating parts, reducing hidden internal‑defect failure risk.
• Lot‑traceable certified documents: Each batch MTR lists ASTM B637 test clauses explicitly to support customer incoming audit and third‑party review.
• Delivered in solution‑annealed condition: Good machinability for complex CNC parts; customers perform aging heat‑treatment after machining to achieve target final strength.

Important Limitation: ASTM B637 Inconel718 has inferior chloride pitting / acid corrosion performance vs Inconel 625. It is optimized for high‑temperature mechanical‑load priority applications, not for severe pure reducing‑acid chemical environments. Aging heat‑treatment must follow qualified procedure to get designed mechanical performance.

Professional material selection suggestions for different project scenarios to help buyers avoid material mismatch risks and reduce project costs:

• Aerospace & Aviation: Select AMS 5662/5663 certified ASTM B637 Inconel 718 (solution annealed + aged). Suitable for gas turbine parts, engine components, aircraft fasteners, and aerospace structural parts, requiring ultra-high temperature resistance and fatigue resistance.
• Oil & Gas Downhole: Choose hot-forged Inconel 718 bar/forging stock. Adapt to high-pressure, high-temperature, and sulfide corrosive downhole environments, used for drilling tools, valve parts, and downhole structural components.
• Energy & Power Industry: Select medium-thick plates and seamless pipes. Applicable to power plant heat exchangers, nuclear power auxiliary parts, and thermal energy equipment, resisting high-temperature oxidation and medium corrosion.
• Precision Industrial Manufacturing: Choose polished bars, fine wires, and precision strips. Used for high-strength fasteners, spring parts, and precision instrument components, with stable dimensional tolerance and mechanical properties.
• Cryogenic Environment: ASTM B637 Inconel 718 maintains excellent low-temperature toughness, suitable for cryogenic equipment and low-temperature pipeline components.

1. Full ASTM B637 / AMS 5662 compliance and traceability.
Every shipment includes a Mill Test Report (MTR) with chemical composition and mechanical properties verified to ASTM B637 / AMS 5662. Full product traceability from raw material batch to finished bar.

2. Solution-annealed condition for optimal machinability.
We supply bar in the solution-annealed condition, ready for you to machine, form, and weld before age-hardening to final properties.

3. Full range stock.
We stock diameters from 12.7 mm to 305 mm, with custom sizes available. Standard sizes ship in 7–15 days.

4. NACE MR0175 compliance documentation.
For oil & gas applications, we provide NACE MR0175/ISO 15156 compliance documentation for sour service. Inconel 718 is approved for oilfield service with a maximum hardness limit of 45 HRC.

5. Technical support for aerospace and oil-gas applications.
Our technical team can advise on machining parameters, heat treatment cycles, and welding procedures for your specific application.

6. Competitive pricing with mill-direct supply.
Direct factory supply with flexible MOQ for trial orders. We maintain stock to shorten your procurement cycle.

Our Factory

 

Vacuum Melting Furnace

Metal Strip Continuous Annealing Production Line

Alloy Welding Wire Drawing Production Line for High Performance Alloy

Automatic Cold Drawing Line For Expansion Alloy Bars

Seamless Pipe Production Line

Solution Annealing Furnace 

Q1: What is the difference between ASTM B637 Inconel 718 and ordinary industrial Inconel 718?

A: ASTM B637 is the exclusive official standard for aerospace and high-pressure industrial-grade Inconel 718, with strict requirements on chemical composition, mechanical properties, heat treatment state and dimensional tolerance. It supports AMS aviation certification and 3.1/3.2 inspection reports, while ordinary Inconel 718 has loose production standards and cannot be used for aerospace, oil and gas high-end precision projects.

Q2: Is UNS N07718 exactly the same as W.Nr 2.4668 and GH4169?

A: Yes. UNS N07718 (US standard), W.Nr 2.4668 (European DIN standard) and Chinese GH4169 are fully equivalent grades with consistent material composition and service performance, which can be mutually replaced in engineering projects and meet international bidding standards.

Q3: Can you provide aerospace-grade certified Inconel 718 products?

A: Absolutely. All our ASTM B637 Inconel 718 products support AMS 5662/5663 aviation certification, complete heat treatment reports, PMI component testing and ultrasonic flaw detection reports, fully meeting aerospace, military and high-end energy project acceptance standards.

Q4: What is your MOQ for Inconel 718? Do you support small batch sample orders?

A: We support flexible procurement with low MOQ. The minimum order is 1kg for conventional profiles, and 1 piece for customized machined parts. Free small samples are available for customer quality testing, which is friendly for project trial production and small-batch procurement.

Q5: What heat treatment state is your ASTM B637 Inconel 718 supplied in?

A: We provide two mainstream states: solution annealed and solution annealed + aged. Aged treatment is recommended for high-temperature, high-pressure and load-bearing structural parts to ensure maximum tensile strength and fatigue resistance; annealed state is suitable for subsequent secondary processing and machining.

Q6: Do you provide custom cutting and deep processing services?

A: Yes. We support one-stop customized services including fixed-length cutting, precision tolerance processing, surface polishing, peeling, bending, drilling and non-standard forging parts. All processing strictly follows ASTM B637 standards to ensure no damage to material performance.

Q7: What certification documents can you provide for customs clearance and project inspection?

A: We can provide complete official documents: EN 10204 3.1/3.2 MTC material test report, PMI chemical composition report, ultrasonic testing report, heat treatment certificate and factory qualification certificate. Third-party official inspection is acceptable.

Q8: How long is the delivery time for stock and customized products?

A: Conventional stock specifications (bars, plates, pipes) can be delivered within 3-5 working days. Custom processing products take 7-15 working days, and large bulk orders are delivered within 15-25 working days. We support urgent order priority production to meet project schedules.

Q9: What scenarios is Inconel 718 not suitable for? What are the alternative materials?

A: For conventional low-corrosion and normal-temperature working scenarios, Inconel 625 can be used as a cost-effective alternative to reduce procurement costs. Inconel 718 is exclusively recommended for high-temperature, high-pressure, fatigue-resistant and aerospace core components to avoid material performance waste.

Q10: Are you a factory or a trading company? Can you guarantee stable supply?

A: We are a 100% mill-direct manufacturer with independent production workshops and complete processing equipment. No middlemen markups, sufficient raw material stock, stable product quality and long-term stable global supply capacity, supporting long-term framework cooperation orders.

Q11: What is ASTM B637 Inconel 718?

A: It is Alloy 718 / UNS N07718 supplied as rod, bar, forging or forging stock under the applicable ASTM B637 requirements. ASTM B637-26 is the current active edition.

Q12: What is the UNS number for Inconel 718 round bar?

A: The UNS designation is N07718. Haynes also identifies HAYNES 718 as UNS N07718.

Q13: What is DIN 2.4668?

A: DIN 2.4668, also identified as NiCr19Fe19NbMo3, is a European designation associated with Alloy 718 / UNS N07718.

Q14: Is ASTM B637 the same as AMS 5662?

A: No. They are separate material specifications. Both are listed for applicable 718 bar and related product forms, so the required specification should follow the customer drawing or purchase order.

Q15: Can I buy Inconel 718 round bar in full-size stock?

A: Yes. Full-size and cut-to-length supply can be arranged depending on diameter, specification, condition and available stock.

Q16: Is Inconel 718 suitable for aerospace applications?

A: Yes, Alloy 718 is widely used for aerospace components requiring high strength and elevated-temperature performance, subject to the specific application and material specification.

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