AMS 5940 Forgings | Custom AMS 5940 Forged Parts | China Leading Manufacturer

What is AMS 5940? Definition, Specification & Overview

AMS 5940 Specification Overview

AMS 5940 is a SAE Aerospace Material Specification that defines the chemical composition, mechanical property requirements, and testing procedures for bars, billets, and forgings produced from a specific precipitation-hardening, low coefficient of thermal expansion (low CTE) iron-nickel-chromium-aluminum-niobium superalloy. The specification is maintained by SAE International under the AMS (Aerospace Material Specifications) system, which covers metallic materials used primarily in aerospace and high-performance industrial applications.

The alloy covered by AMS 5940 belongs to the family of engineered iron-nickel superalloys in which the ratio of iron to nickel is carefully balanced to achieve a naturally low thermal expansion coefficient — a behavior related to the Invar effect observed in Fe-Ni binary alloys at certain compositions. Unlike plain Invar alloys (which have very low strength), AMS 5940 incorporates significant additions of aluminum and niobium to generate coherent strengthening precipitates, delivering both dimensional stability and high mechanical strength at operating temperatures up to 1200°F (649°C).

This combination of properties — which cannot be simultaneously achieved by standard austenitic superalloys — makes AMS 5940 the material of choice for design engineers working on rotating turbomachinery, high-pressure valve systems, and precision aerospace structures where dimensional growth under thermal cycling would otherwise compromise system performance or fatigue life.

Why Choose Jiangsu Liangyi for Your AMS 5940 Forging Needs?

Established in 1997, Jiangsu Liangyi Co., Limited is an ISO 9001:2015 certified professional manufacturer of AMS 5940 open die forgings and seamless rolled steel forged rings, with over 25 years of continuous experience in manufacturing high-performance superalloy forgings for clients across 50+ countries worldwide. Unlike trading companies or distributors, we operate a fully integrated manufacturing facility — from raw material melting to precision machining and final inspection — giving us complete process control and the technical depth to solve challenging forging problems that off-the-shelf suppliers cannot address.

Our engineering team has accumulated deep, application-specific knowledge of AMS 5940's behavior during forging, heat treatment, and service, enabling us to proactively optimize forging ratios, forging temperature windows, grain flow patterns, and heat treatment cycles to consistently deliver forgings that exceed minimum AMS specification requirements. This is not simply a compliance exercise — our clients in aerospace, oil and gas, and power generation require forgings that perform reliably at the edge of what materials science allows, and our process expertise is built around that expectation.

Metallurgical Science: How AMS 5940 Achieves Low CTE & High Strength

The Low-CTE Mechanism: The Iron-Nickel Invar Effect

The most distinctive property of AMS 5940 — its unusually low coefficient of thermal expansion — originates from a well-understood but delicate physical phenomenon: the Invar effect. In iron-nickel alloys at compositions near 35–45% nickel, the normal tendency of a crystal lattice to expand when heated is partially cancelled by a competing magneto-volume effect. As temperature increases, the magnetic ordering of the Fe-Ni lattice weakens, causing a slight lattice contraction that partially offsets the normal thermal expansion. The result is a much lower net thermal expansion than would be seen in a standard steel or austenitic superalloy.

AMS 5940 exploits this effect by specifying a nickel content of 26–30% and an iron content of 24–27%, placing the alloy's Fe-Ni core composition in the range where Invar-like behavior is strongest. The remaining balance of the alloy — chromium, aluminum, niobium, and trace additions — is carefully chosen to preserve the low-CTE character of the Fe-Ni core while adding oxidation resistance, grain boundary strength, and precipitation hardening capability.

This is why simply substituting a standard nickel superalloy like Inconel 718 in an AMS 5940 application will cause problems: Inconel 718 has a much higher nickel content and different elemental balance, placing it outside the Invar regime and giving it a significantly higher CTE. Components that fit correctly at room temperature will no longer fit correctly at operating temperature, leading to fretting, increased leakage, fatigue crack initiation at interfaces, or misalignment of precision rotating parts.

The Strengthening Mechanism: Coherent Gamma-Prime Precipitation

While low CTE alone could theoretically be achieved with a plain Fe-Ni alloy (like Invar 36), such alloys have inadequate strength for gas turbine, valve, or aerospace structural applications. AMS 5940 solves this problem through precipitation hardening — the same mechanism used in Inconel 718, Waspaloy, and other high-performance superalloys — but executed in a way that does not disrupt the low-CTE Fe-Ni matrix.

The precipitation hardening in AMS 5940 works through two primary mechanisms:

• Gamma-prime (γ') phase precipitation: The aluminum additions promote the formation of coherent, ordered Ni₃Al-based precipitates (the $\gamma'$ phase), which are crystallographically compatible with the face-centered cubic (FCC) matrix. These nano-scale precipitates impede the dislocation motion and thereby increase the strength with little effect on the thermal expansion. Their coherence with the matrix minimizes the mismatch strain which would otherwise lead to residual stress and reduce fatigue life.
• Niobium-rich phase formation: Niobium additions contribute additional strengthening by forming secondary precipitates at grain boundaries and within grains. At controlled concentrations, niobium refines grain size during solution annealing (through grain boundary pinning), prevents grain growth at high temperatures, and contributes to creep resistance by restricting grain boundary sliding — a critical failure mode in components under sustained load at elevated temperature.

The result is an alloy that achieves tensile and yield strengths comparable to high-performance austenitic superalloys while maintaining the low thermal expansion of the Invar-family iron-nickel system. This combination is genuinely difficult to achieve and cannot be approximated by mixing existing alloy systems — it requires the precise compositional control that the AMS 5940 specification defines.

Oxidation Resistance: The Role of High Aluminum Content

At sustained operating temperatures above 900°F (482°C), most iron-nickel alloys suffer from accelerating oxidation that progressively consumes the alloy surface, generates oxide scales that spall and contaminate the gas path, and creates oxygen-enriched zones beneath the surface that embrittle the material. Standard Fe-Ni alloys and even many Cr-bearing stainless steels are inadequate for continuous service at 1200°F (649°C).

AMS 5940 addresses this directly through its high aluminum content of 5–6 wt%, which is significantly higher than most iron-nickel alloys. Above a critical threshold — approximately 2–3% Al in most Fe-Ni systems — aluminum preferentially oxidizes to form a continuous, tightly adherent alpha-Al₂O₃ (alumina) scale on the alloy surface. This alumina scale has exceptionally low oxygen permeability compared to iron oxides or chromia scales, acting as an effective diffusion barrier that dramatically reduces the rate of continued oxidation.

This is not a passive protective coating applied externally — it is a self-forming, self-healing film generated from the alloy's own aluminum reservoir. Should mechanical contact, thermal cycling, or erosion damage the oxide film locally, the underlying alloy re-oxidizes at that location and reforms the protective alumina layer. This makes AMS 5940 far more reliable in long-term service than alloys that depend solely on chromia formation for oxidation protection.

Role of Each Alloying Element in AMS 5940

Understanding why each element is present — and why its limits are set the way they are — is essential for engineers specifying AMS 5940 components and for quality engineers verifying chemical composition results. The following analysis reflects our metallurgical team's working knowledge of how elemental composition drives AMS 5940's performance in service:

Main Advantages of AMS 5940 Superalloy for Critical Industrial Applications

AMS 5940 provides advantages over traditional superalloys that are not incremental improvements, but rather fundamentally different capabilities that allow design possibilities not otherwise possible. Each of the following advantages resolves a particular technical limitation that engineers face every day in demanding industrial applications:

• Engineered-Low Thermal Expansion: Unlike alloys where low CTE is an accidental byproduct of composition, AMS 5940's thermal expansion behavior is deliberately engineered through its Fe-Ni ratio. This allows design engineers to predict and account for thermal growth with high confidence across the full operating temperature range — a critical capability for turbine clearance management, where even small unpredicted expansions can cause blade-tip rub and catastrophic rotor damage.
• Alumina-Forming Oxidation Resistance at 1200°F / 649°C: The self-forming α-Al₂O₃ film created by AMS 5940's high aluminum content (5–6%) provides oxidation protection that is significantly more stable than chromia-based protection mechanisms at temperatures above ~1100°F (593°C). This translates directly into longer component service life, fewer planned maintenance outages, and reduced risk of oxide scale spallation contaminating downstream turbine stages.
• Precipitation-Hardened Strength Without CTE Penalty: Most high-strength alloys achieve their strength through compositions that inevitably raise thermal expansion coefficients. AMS 5940's precipitation hardening mechanism operates through coherent γ' precipitates that do not disrupt the Fe-Ni Invar effect, maintaining the low CTE while delivering room-temperature UTS of 160 ksi (1103 MPa) minimum and elevated-temperature UTS of 130 ksi (896 MPa) at 1200°F.
• Stable Grain Structure Under Thermal Cycling:Many alloys that perform well in early tests slowly get worse after repeated temperature changes. This happens as grain boundaries grow weaker, internal particles become larger, and long-term creep damage builds up over time. The added niobium in AMS 5940 locks the grain structure in place to stop grain growth during heat treatment and actual service use. At the same time, its controlled boron content makes grain boundaries stronger to resist slipping and oxidation. Both features help keep steady fatigue performance through thousands of temperature cycles.
• Compatibility with Titanium and Ceramic Components: Many modern aerospace and industrial gas turbine designs incorporate titanium alloy casings or ceramic matrix composite (CMC) components adjacent to metallic hot-section parts. The CTE of titanium alloys (~4.8–9.0 × 10⁻⁶/°C) and SiC/SiC CMC materials (~4–5 × 10⁻⁶/°C) is substantially lower than standard superalloys. AMS 5940's reduced CTE provides a better geometric match with these adjacent materials, reducing interfacial thermal stress and extending the life of fasteners, seals, and mechanical attachments.
• Excellent Triple-Melt Cleanliness for NDT Acceptance: Our AMS 5940 forgings, made with VIM+VAR+ESR triple melting, have far fewer impurities, almost no holes in the material, and much less uneven element distribution than parts made with only single or double melting. This cleaner material performs much better in ultrasonic testing. Its high purity makes sure any signals picked up during full 100% ultrasonic checks come from real internal flaws, not random noise caused by impurities, so we can reliably meet strict inspection acceptance standards every time.

Engineers selecting materials for high-temperature, precision components frequently evaluate AMS 5940 against several other alloys. The comparison below reflects our engineering team's accumulated experience with these materials in actual forging and service applications — not simply published data sheet values, which often fail to capture practical processing and service behavior.

Material Selection Guide: When to Choose AMS 5940 vs. Alternatives

One of the most common questions we receive from procurement and engineering teams is: "Do we actually need AMS 5940, or can we use Inconel 718 / standard stainless steel for this part?" The following guide reflects the selection logic our technical team uses when consulting on customer applications:

Full-Range Custom AMS 5940 Forged Product Forms

We manufacture custom AMS 5940 forging parts in a complete range of shapes and dimensions, in strict accordance with international standards and client drawings. Unlike many forging companies that specialize in a narrow product range, our facility is equipped to produce the full spectrum of forged forms — from small precision forgings to massive structural billets — all in AMS 5940 with full specification compliance and material traceability. Our available AMS 5940 forged product forms include:

All AMS 5940 forgings are available in the as-forged condition, rough machined condition, semi-finished condition, or fully finished (machined-to-drawing) condition according to client requirements. Explore our full forged product range to see our complete capabilities.

AMS 5940 Forging Manufacturing Process: Step by Step

Manufacturing AMS 5940 forgings that consistently meet specification requirements — and reliably exceed them — requires far more than simply heating the material and pressing it to shape. Each step in our production sequence is engineered to preserve the compositional integrity of the alloy, refine its microstructure, and prevent the metallurgical defects (segregation, grain boundary oxidation, overheating, inadequate reduction ratio) that can compromise component performance in service.

AMS 5940 Heat Treatment: Solution Annealing & Precipitation Hardening

Heat treatment is not an optional finishing step for AMS 5940 — it is an integral part of the metallurgical development of the alloy's final properties. An incorrectly heat-treated AMS 5940 forging that passes dimensional inspection will fail to meet mechanical property requirements, and may fail in service through insufficient strength, poor creep resistance, or inadequate fatigue life. Our heat treatment capability and process control directly impact the reliability of every AMS 5940 component we ship.

Solution Annealing

Solution annealing serves two primary purposes in AMS 5940 processing: first, it dissolves all strengthening precipitates (γ' phases and any Nb-rich phases) that formed during forging, resetting the microstructure to a homogeneous single-phase austenite; second, it allows grain growth to proceed to a defined, controlled grain size before the grains are "pinned" by newly dissolving Nb-rich particles at the solution anneal temperature. The solution anneal temperature is above the solvus temperature of the strengthening precipitates but below the incipient melting temperature (solidus) of the alloy — a window that must be respected precisely to avoid both under-dissolving (leaving residual phases that interfere with subsequent precipitation) and overheating (which causes grain boundary liquation, an irreversible form of damage that severely reduces ductility and fatigue life).

Our 10 computer-controlled solution annealing furnaces are equipped with multiple thermocouples (including load-attached thermocouples for critical components), SCADA temperature data logging, and regular temperature uniformity surveys in accordance with AMS 2750 pyrometry requirements. After solution annealing, parts are cooled at a controlled rate appropriate to the section size — rapid cooling for thin sections to avoid re-precipitation during cooling, and more controlled cooling for heavy sections to minimize thermal gradients and quench-induced residual stress.

Precipitation Hardening (Aging)

The aging cycle for AMS 5940 is performed at temperatures substantially below the solution anneal temperature — typically in the range where γ' precipitates nucleate and grow at a rate that produces the target precipitate size distribution. The aging time determines the final precipitate size: too short and the precipitates are too fine and may over-age during service at elevated temperature; too long and the precipitates coarsen and lose coherency with the matrix, reducing their effectiveness as dislocation barriers.

For components with thick cross-sections (above approximately 150 mm), our engineering team applies section-size-dependent aging corrections — extending hold times at temperature to ensure that the interior of the forging reaches the same thermal exposure as the surface-adjacent material. This is particularly important for AMS 5940 because the alloy's strengthening is entirely precipitation-dependent: surface hardness that meets specification does not guarantee interior compliance if the core was inadequately aged.

All aging cycles are performed with full time-temperature logging, and representative test pieces from each furnace load are tension-tested and hardness-tested to verify that the resulting mechanical properties meet AMS 5940 requirements before any components from that batch are shipped.

Global Industry Applications & Verified Project Cases of AMS 5940 Forgings

The following industry applications and project cases represent verified, long-term supply relationships and completed engineering projects — not theoretical use cases. Each project case reflects a specific technical challenge solved through the combination of AMS 5940's material properties and our manufacturing capability.

Aerospace & Aviation — Gas Turbine Hot Section Components (Europe & North America)

AMS 5940 is the preferred forging material for aerospace gas turbine hot section components that are located adjacent to the turbine disc and casing — specifically components where dimensional stability during thermal transients (takeoff, climb, cruise, descent, shutdown) directly governs blade tip clearance, seal effectiveness, and compressor stage matching. Tighter clearances achieved through low-CTE materials directly translate into improved specific fuel consumption (SFC) — a commercially critical parameter for both commercial and military aircraft operators.

Our AMS 5940 forged aerospace components include turbine blade forgings, compressor impeller blanks, turbine disc blanks, blisk forgings, structural casing segments, and high-strength structural fasteners. All aerospace components are manufactured under our ISO 9001:2015 certified quality management system. EN10204 3.2 certificates with third-party inspection witness are available upon request through the client's nominated inspection body.

Oil & Gas Extraction & Production — Wellhead & Valve Components (Middle East, North America & Southeast Asia)

The oil and gas industry presents a unique combination of corrosion, pressure, and thermal demands that few alloys can satisfy simultaneously. Wellhead equipment and production tree valve components must operate in sour service environments (H₂S-bearing fluids), at high working pressures (up to 20,000 psi in deep-water and high-pressure wells), at temperatures ranging from ambient to over 350°F (177°C), and they must maintain leak-tight performance over decades of service without requiring disassembly. AMS 5940's combination of strength, corrosion resistance, and dimensional stability under thermal fluctuations makes it an appropriate material for demanding wellhead applications where standard CRA (corrosion-resistant alloy) steels are marginal.

Our AMS 5940 forged oil and gas products — valve bodies, bonnet forgings, gate blanks, stem blanks, seat ring blanks, wellhead connector forgings, and choke body forgings — are produced in accordance with API 6A (latest edition) material and testing requirements, including hardness testing, tensile testing, CVN impact testing, and SSC (Sulfide Stress Cracking) resistance testing where specified by the client. Note: Jiangsu Liangyi does not hold an API Monogram license. Clients requiring API Monogram-stamped products should specify this requirement at the inquiry stage so that appropriate sourcing can be arranged.

Thermal & Nuclear Power Generation — Steam Turbine Control Valve Components (Asia, Europe & Middle East)

Modern large-scale thermal power plants — particularly ultra-supercritical (USC) and advanced ultra-supercritical (A-USC) units rated at 600–1000 MW — operate with main steam temperatures above 1050°F (566°C) and reheat steam temperatures approaching 1100°F (593°C). Steam turbine control valves (MSV, GV, CV, CRV) that regulate steam flow into the turbine must cycle open and closed thousands of times per year without leakage, while being exposed to repeated thermal transients from turbine load changes and start-stop cycles. The dimensional stability of valve disc and valve seat contact faces under these conditions directly controls valve seat leakage rates — a primary source of thermal efficiency loss in aging turbines.

Our AMS 5940 forged power generation components include steam turbine control valve disc blanks, reheat valve disc blanks, MSV/GV/CV/CRV valve seat ring forgings, guide ring forgings, and seal ring forgings. These components are manufactured with particular attention to grain flow continuity at the valve contact face geometry, to ensure that the forging fibre structure follows the valve disc profile and provides maximum resistance to fatigue crack initiation at the seating surface.

Industrial Turbomachinery & Petrochemical Processing (Global)

Beyond aerospace and power generation, AMS 5940 finds important applications in high-performance industrial turbomachinery — centrifugal compressors for natural gas transmission, process gas compressors in refineries and chemical plants, high-speed turbines for industrial power recovery, and cryogenic turboexpanders where dimensional stability across a very wide temperature range (from cryogenic service startup to operating temperature) is critical. Our AMS 5940 forged turbomachinery products include centrifugal compressor impeller blanks, compressor rotor disc forgings, pump casing and bowl forgings, seamless rolled rings for bearing housings and seal glands, and heat exchanger tubesheet forgings for high-temperature service.

AMS 5940 Chemical Composition Requirements (ASTM & AMS Compliant)

All our AMS 5940 forged material is produced via triple melting (VIM + VAR + ESR) to ensure uniform chemical composition and the lowest possible inclusion content. Chemical analysis of each heat is performed using optical emission spectrometry (OES) and ICP-OES in accordance with ASTM E 354 or other purchaser-approved analytical methods, and must meet the requirements of AMS 2269. The composition limits below represent the AMS 5940 specification requirements — our actual production heats typically target the center of each range to maximize the margin against specification limits:

Balance: Nickel is listed as the balance element in the AMS 5940 specification. Note that the Fe content range (24–27%) and Ni content range (26–30%) are both explicitly specified rather than left as "balance," which is unusual and reflects the critical importance of their specific ratio to the alloy's low-CTE behavior.

AMS 5940 Mechanical & Physical Properties

All our AMS 5940 forgings are heat treated via solution annealing and precipitation hardening to achieve the required mechanical properties, with full test reports provided for every shipment. The grain flow of our forgings follows the general contour of the part, with no reentrant grain flow permitted — a forging quality parameter specified in AMS 5940 and verified by macroscopic grain flow testing on representative sections from each production lot.

Room Temperature Minimum Mechanical Properties

Elevated Temperature (1200°F / 649°C) Mechanical Properties

Physical Properties & Thermal Characteristics

Full-Process Manufacturing & Strict Quality Control for AMS 5940 Forgings

Our quality assurance approach for AMS 5940 forgings is built on a simple principle: every quality control step must prevent a non-conformance from reaching the next step — not simply detect it at the end. This means that our quality engineers are involved in production planning, procedure qualification, in-process monitoring, and final inspection, rather than serving purely as an end-of-line inspection function. The result is a production yield rate and a zero-field-failure record that reflects genuine process control, not inspection-by-sorting.

Integrated Steel Melting & Forging Process

Our AMS 5940 material is produced via triple melting (VIM + VAR + ESR) to ensure ultra-high purity and uniform chemical composition across the full ingot cross-section. Our 2000T to 6300T hydraulic forging presses and 1–5M seamless rolling machines forge the material under strict control of forging temperature, reduction ratio, inter-pass reheating frequency, and finishing temperature — all of which are documented in qualified forging procedure sheets (FPS) that are maintained, reviewed, and updated based on production data. We can produce custom AMS 5940 forgings from 30 kg to 30 tons according to client drawings and specifications.

Precision Heat Treatment Capability

We have 10 computer controlled heat treatment furnaces that are dedicated to superalloy processing. These allow for solution annealing and multi-stage precipitation hardening of AMS 5940 forgings. All of our furnaces are equipped with data logging systems that track time-temperature histories for each batch, and we keep our furnace calibration records in accordance with the AMS 2750 pyrometry requirements—a standard that our aerospace and oil-and-gas customers routinely require. All heat treatment processes are fully documented and traceable from furnace batch number to individual forging serial number.

Comprehensive Quality Inspection & Testing Program

We perform a comprehensive acceptance testing program for every heat and lot of AMS 5940 forgings, with all results reported in the MTC. Required acceptance tests include:

• Chemical composition analysis — OES and ICP-OES analysis of each heat; reported against AMS 5940 / AMS 2269 limits
• Mean coefficient of linear expansion testing — Dilatometry testing per AMS specification for each heat, confirming the alloy's thermal expansion characteristics are within the low-CTE range
• Hardness testing — Every piece in the lot; Rockwell C scale; must fall within the specified range for the aging condition
• Average grain size determination — Metallographic examination per ASTM E 112; grain size must meet the AMS 5940 requirement for the specific product form
• Room-temperature tensile properties — UTS, YS (0.2% offset), elongation (4D), and reduction of area from each lot after precipitation hardening; minimum values as tabulated above
• Stress-rupture properties — From each lot after precipitation hardening; minimum rupture life and minimum ductility at rupture per AMS 5940 table
• 100% ultrasonic testing (UT) — Full volumetric inspection of all forgings; acceptance criteria per AMS 2630 or client specification; phased array UT (PAUT) available for critical components
• Magnetic particle testing (MT) or liquid penetrant testing (PT) — 100% surface inspection for all critical components; MT for ferromagnetic condition, PT for non-ferromagnetic condition
• Dimensional inspection — 100% dimensional verification against client drawings using CMM (Coordinate Measuring Machine) and conventional gauging
• Grain flow examination — Macroscopic grain flow verification on sectioned sample from each lot; confirms forging fibre follows part contour with no reentrant flow

Periodic tests — including elevated temperature tensile testing at 1200°F (649°C), elevated temperature stress-rupture, and metallographic examination for incipient melting or detrimental phase formation — are performed on a frequency defined by purchaser requirements or our internal periodic testing schedule, whichever is more stringent.

Global Compliance & Certifications

Our AMS 5940 forgings are produced in accordance with the requirements of major international standards — AMS, ASTM, DIN, EN, and JIS — and our quality management system is certified to ISO 9001:2015. For oil and gas applications, forgings can be produced to meet API 6A material and testing requirements (note: we do not hold an API Monogram license). Our quality documentation can be structured to be compatible with ASME, PED (European Pressure Equipment Directive), or other applicable pressure equipment code requirements — please specify your documentation needs at the inquiry stage. Browse our full material range to explore other superalloy forging options.

Documentation, Certification, Marking & Packaging

Material Test Certificates (MTC)

Each shipment of AMS 5940 forgings comes with a full Material Test Certificate (MTC) package from Jiangsu Liangyi. Our standard MTC is issued in accordance with EN 10204 Type 3.1 – certified by our Quality Control Manager and traceable to the specific ingot heat number, forging lot number, heat treatment batch number and individual piece markings. Independent third-party verification is available upon request in the form of EN 10204 Type 3.2 certificates. 3.2 inspection is a third party inspection body nominated by the client or mutually agreed (e.g. Bureau Veritas, SGS, TÜV, Lloyd's Register, DNV or the client's own approved inspector) witnessing testing and countersigning the certificate. TPI arrangements and any fees are agreed at the quotation stage.

Our MTC package includes:

• Full chemical composition analysis results vs. AMS 5940 specification limits
• Room temperature tensile test results (UTS, YS, elongation, RA) vs. minimum requirements
• Elevated temperature tensile test results (when required)
• Stress-rupture test results (when required)
• Hardness test results from each piece
• Grain size determination results
• Thermal expansion coefficient test results
• UT, MT/PT nondestructive test report with applicable acceptance criteria
• Heat treatment time-temperature records (furnace chart excerpts)
• Dimensional inspection report
• Grain flow inspection report (where applicable)

Part Marking & Traceability

All AMS 5940 forgings are permanently marked per client requirements and AMS standards, typically including: material designation (AMS 5940), heat number, lot number, part number, and our manufacturer's identification code. Marking methods include low-stress vibro-engraving (preferred for precipitation-hardened components to avoid stress concentration), electrochemical etching, and ink stenciling for surfaces that will be subsequently machined. Marking locations are selected to survive machining operations and remain readable through the component's service life.

Packaging & Export Handling

AMS 5940 forgings are packed as per customers’ specifications and the requirements of destination country import regulations. Standard packaging includes:  Corrosion protection paper wrap (Vapor Corrosion Inhibitor - VCI) Wooden crates or pallets constructed to fumigation free standards of ISPM-15 (accepted in all major import markets without fumigation certification) Custom cushioning and clamping to prevent movement and damage during ocean or air freight. Sea freight (FCL or LCL), air freight or express courier delivery direct from our factory to the client’s facility or freight forwarder.

Frequently Asked Questions (FAQ) About AMS 5940 Forgings

Related High-Performance Superalloy Forgings

In addition to AMS 5940, we manufacture custom forgings in a complete range of high-performance nickel, iron-nickel, and cobalt-based superalloy materials. We have metallurgical expertise across the full spectrum of precipitation-hardened and solid-solution-strengthened superalloys, which allows us to advise customers on alternative materials when AMS 5940 is not the best selection for a particular application:

• Inconel 725 (Alloy 725, UNS N07725) — High-strength, corrosion-resistant Ni-Cr-Mo-Nb alloy for sour service wellhead components; excellent SSC resistance
• Inconel 600 (Alloy 600, UNS N06600) — Solid solution Ni-Cr alloy with outstanding oxidation and carburization resistance for furnace and chemical process applications
• Inconel 718 (Alloy 718, UNS N07718) — The most widely used precipitation-hardened superalloy; higher room-temperature strength than AMS 5940; suitable where low CTE is not needed
• 1.4944 (X5NiCrTi26-15) — European standard precipitation-hardened Fe-Ni-Cr-Ti alloy for steam turbine components; comparable application range to AMS 5940
• 1.6368 (15NiCuMoNb5-6-4) — High-strength low-alloy steel forging for pressure vessel and nozzle applications; cost-effective where superalloy properties are not needed
• 1.4449 (X3CrNiMo18-12-3) — Austenitic stainless steel forging for moderate-temperature corrosion-resistant applications
• Hastelloy C276, C22, X — Molybdenum-bearing nickel alloys for aggressive corrosion environments; used where AMS 5940's corrosion resistance is insufficient for the specific medium
• Monel 400, Monel K500 — Nickel-copper alloys with excellent resistance to seawater, hydrofluoric acid, and alkalis; used in marine and chemical processing applications

Contact our engineering team to discuss whether AMS 5940 or an alternative superalloy is the optimal choice for your specific design requirements. We provide no-charge material selection consulting as part of our technical support service for qualified inquiries.

Trademark Notice: Inconel® is a registered trademark of Special Metals Corporation (Precision Castparts Corp.). Hastelloy® is a registered trademark of Haynes International, Inc. Monel® is a registered trademark of Special Metals Corporation. Invar® is a registered trademark of Imphy Alloys / ArcelorMittal. These names are referenced on this page for technical comparison purposes only. Jiangsu Liangyi Co., Limited has no affiliation with the trademark owners. Products manufactured by Jiangsu Liangyi are identified by their UNS designations and applicable material specifications.

Contact Us for Custom AMS 5940 Forging Solutions