Model No: Inconel 939

Inconel 939

If you require a component that must withstand rotation and mechanical loads at 850°C without replacement over the long term, Inconel 939 (UNS N93910) is the only choice.

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Product Introduction

γ′-precipitation-hardened | For long-term service at 850°C / Specialized for gas turbine blades and aero-engine hot-section components

Inconel 939 is a γ′-precipitation-hardened nickel-based alloy specifically designed for long-term service at 850°C. Its composition incorporates a combination of chromium (22–23%), cobalt (18–20%), tungsten (1–3%), titanium (3.7%), and aluminum (1.9%); this specific blend of elements results in a γ′ precipitate volume fraction of 35–40%, which is the key to the alloy's ability to withstand creep at 850°C.

Who is buying it?

Do your gas turbine blades or guide vanes need to operate continuously at 850°C while withstanding thermal cycling and centrifugal forces?
Do your combustor nozzles need to endure gas erosion at 980°C and resist thermal fatigue?
Do your petrochemical high-temperature reactor or cracking furnace tubes need to operate for years without replacement in high-temperature, corrosive environments?
Do your aero-engine hot-section components require a temperature resistance of 980°C and a creep life exceeding 25,000 hours?

Inconel 939 supplied by Lork Group is delivered in strict accordance with relevant specifications (such as AMS standards or custom requirements based on drawings) and is accompanied by a comprehensive Certified Material Test Report (CMTR) detailing chemical composition, high-temperature tensile properties, and creep-rupture strength data.

Chemical Composition

The key difference between the chemical composition of Inconel 939 and standard nickel-based alloys is the simultaneous inclusion of high levels of chromium and cobalt, along with tungsten. This combination delivers oxidation resistance, solid-solution strengthening, and γ′ (gamma-prime) strengthening all at once.

Typical chemical composition of IN939 supplied by Lork Group (compiled from academic and industry data)：

Material Type	C	Nb	Ta	W	Ni	Cr	Co	Ti	Ai	B&Za
Inconel 939	≤ 0.15	0.5 - 1.5	1.0 - 2.0	1.0 - 3.0	Margin	21.0 - 23.0	18.0 - 20.0	2.8 - 4.0	1.4 - 2.0	≤ 0.015 / ≤ 0.15

Mechanical Properties

Typical mechanical properties (fully heat-treated forgings/bars):

Room-temperature yield strength (0.2%)	Harness	Room-temperature tensile strength	Room-temperature elongation	High-temperature (870°C) tensile strength	High-temperature (870°C) yield strength	Melting point range
~850 - 1075 MPa	~40-45 HRC / 470 HV	~1100 - 1400 MPa	~10 - 14%	~616 MPa	~477 MPa	~1300℃

⚠️Key Insight: The superior performance of Inconel 939 is not inherent"out of the box"; it requires rigorous "solution treatment plus double aging"heat treatment to"grow"the γ′ strengthening phase. With the exact same chemical composition, failure to perform the heat treatment correctly can result in a strength level that is only half of the peak value.

Heat treatment: This is the"Achilles' heel"of IN939.

The performance of Inconel 939 depends 70% on its composition and 30% on heat treatment; if the heat treatment isn't done correctly, buying the material is a waste of money.

Typical heat treatment processes (methodologies recognized by academic and industry research):

Step	Temperature	Time	Cooling Method	Purpose
Solution treatment	1150 - 1190℃	4 hours	Rapid cooling (argon gas or oil quench)	Eliminate deleterious η phase; ensure complete solid solution of γ′
First aging treatment	1000°C	6 hours	Rapid cooling	Precipitation of primary γ′ and carbides
Secondary aging	800°C	4–16 hours	Air cooling	Precipitation of fine secondary γ′ phases to optimize strength and creep properties

⚠️Critical requirements for procurement:

The solution treatment temperature must be ≥ 1150°C; temperatures below this level fail to eliminate the η phase, which would severely compromise toughness and creep life.
Rapid cooling is mandatory (e.g., rapid argon cooling or oil quenching); slow cooling causes γ′ phase coarsening, preventing the material from reaching peak strength.
The γ′ phase in IN939 is stable below 911°C; exceeding this temperature triggers the precipitation of the needle-like η phase (a brittle phase), necessitating strict control of operating conditions during long-term service.

RFQ

IN939 is a"high-end specialty material"; purchasing the wrong condition or grade results in wasted expenditure. Please answer the following questions (or click the button on the right to contact a technical engineer directly):

Q1: What is your application area and the specific component involved?
A. Gas turbine turbine blades / guide vanes (castings)
B. Aero-engine combustor nozzles
C. Petrochemical high-temperature reactors / cracking furnace tubes
D. Additive manufacturing / 3D printing (requires powder or wire)
E. Other (please specify)
F. Not sure; need an engineer's recommendation (please describe: temperature ___°C / medium ___ / rotating load-bearing component?)

Q2: What product form do you require?
A. Castings (precision-cast blades / nozzles)
B. Bar stock / Forgings (machined into shafts / structural components)
C. Powder (for additive manufacturing)
D. Tubing / Piping (high-temperature piping)

Q3: What are your requirements regarding operating temperature and service life?
A. 700–800°C for < 10,000 hours
B. 800–850°C for > 10,000 hours (IN939's sweet spot)
C. > 850°C (may need to consider other grades, such as the René or CMSX series)
D. Not sure

Q4: Does your product require welding or additive manufacturing?
A. No; it is a single-piece casting or forging.
B. Welding is required (IN939 is a"difficult-to-weld"alloy requiring special processes; please specify the welding method).
C. Additive manufacturing or laser repair is required.

Q5: What are the applicable standards?

A. AMS specifications (Aviation)
B. Custom-made to drawings / Corporate standards
C. Uncertain; requires confirmation

Pricing and Lead Times
The price of IN939 is directly influenced by the market prices of cobalt, nickel, and tungsten. Lork Group’s price quotations are valid for 7 days.

Reference Price Range (based on 2026 market conditions; for reference only):

Castings / Bars: Approx. $50–$70/kg (depending on specifications and order volume)

Special Heat Treatment / Precision-Finished Parts: 20–40% premium

Reference Lead Times:

Standard stock items: 3–7 business days

Non-standard sizes / Custom heat treatment: 3–6 weeks

Custom casting / Forging batches: 7–20 weeks

Contact the Lork Group Technical Team
With the right heat treatment, IN939 becomes a"long-service-life champion"at 850°C; with the wrong one, it turns into"brittle scrap metal."Send us details regarding your operating temperature, component geometry, and processing method, and we will provide a comprehensive solution matching the material grade to the optimal process.

📞Consultation hotline: [+86 175 1308 1871]
📧 Email: [daisy@lorkgroup.com]
💬 WhatsApp: [+86 175 1308 1871]