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Xi'an Dongmeng Group Co., Ltd. is one of the most reliable manufacturers and suppliers of Nimonic 75 Alloy (UNS N06075) 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.

What is Nimonic 75 Alloy?

Nimonic 75 (UNS N06075) is a nickel-chromium-based solid solution strengthened superalloy designed for high-temperature oxidation resistance and stable mechanical performance in continuous service environments up to approximately 800°C (1472°F).

It is widely used in aerospace engineering, thermal processing equipment, and industrial furnace components where resistance to oxidation, scaling, and thermal fatigue is critical.

Compared with precipitation-hardened alloys, Nimonic 75 offers:

Excellent oxidation resistance

Stable mechanical strength at elevated temperature

Good fabrication and welding properties

Reliable performance under cyclic thermal stress

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NIMONIC 75 Alloy

NIMONIC alloy 75 (UNS N06075/W.Nr. 2.4951 & 2.4630) is an 80/20 nickel-chromium alloy with controlled additions of titanium and carbon. First introduced in the 1940s for turbine blades in the prototype Whittle jet engines, it is now mostly used for sheet applications calling for oxidation and scaling resistance coupled with medium strength at high operating temperatures. It is still used in gas turbine engineering and also for industrial thermal processing, furnace components and heat-treatment equipment. It is readily fabricated and welded.

NIMONIC 75 is prized for the following combination of properties:

Excellent High-Temperature Strength: It retains a significant portion of its strength and hardness at temperatures up to approximately 815°C (1500°F). Its primary strength mechanism is solid-solution strengthening.

Outstanding Oxidation Resistance: The high chromium content (18-21%) forms a dense, adherent, and protective layer of chromium oxide (Cr₂O₃) on the surface, which prevents further oxidation and scaling at high temperatures.

Good Corrosion Resistance: Resists a wide variety of corrosive environments, including many acids and alkalis.

Good Fabricability: It can be readily forged, hot and cold worked, machined, and joined by welding and brazing.

NIMONIC 75 Alloy Chemical Composition, %:

Carbon ........................................................................0.08-0.15

Chromium....................................................................18.0-21.0

Copper..........................................................................0.5 max.

Iron................................................................................5.0 max.

Manganese ...................................................................1.0 max.

Silicon ...........................................................................1.0 max.

Titanium...........................................................................0.2-0.6

Nickel............................................................................Balance

Mechanical & Thermal Properties

Property	Value
Density	8.37 g/cm³
Melting Range	1340 – 1380°C
Max Service Temperature	~800°C
Tensile Strength	750–950 MPa
Hardness	~200–250 HV
Oxidation Resistance	Excellent

Heat-Treatment

For bar 30-60 minutes at 1050°C (1920°F) followed by air cooling.

For sheet 5-10 minutes at 1050°C (1920°F) followed by air cooling or, before welding, 5-10 min/1050°C (1920°F)/AC + an optional 10 min/1050°C (1920°F)/AC.

Hot Working

NIMONIC alloy 75 can be hot worked in the range 1220- 950°C (2230-1740°F).

Cold Working

The good ductility and malleability of annealed NIMONIC alloy 75 make it amenable to many methods of cold deformation. The alloy is subject to rapid strain hardening. Because of this increased strength, large reductions can be made without rupture.

Available Products and Specifications

NIMONIC alloy 75 is designated as UNS N06075 and Werkstoff Numbers 2.4951 and 2.4630. Other designations include AFNOR NC20T, AICMA Ni-P91HT and DIN NiCr20Ti. Alloy 75 is available as sheet, strip, plate, round bar, forging stock, wire, tube and extruded section.

Rod, Bar, Wire and Forging Stock - BS HR 5, BS HR 504, DIN 17752, AECMA PrEN2306, AECMA PrEN2307, AECMA PrEN2402, ISO 9723-25

Plate, Sheet and Strip - BS HR 203, DIN 17750, AECMA PrEN2293, AECMA PrEN2302, AECMA PrEN2411, ISO 6208

Pipe and Tube - BS HR 403, DIN 17751, AECMA PrEN2294, ISO 6207

Other Product Forms - DIN 17742, AECMA PrEN2308

Applications

NIMONIC 75's properties make it ideal for high-stress, high-temperature components, particularly in the aerospace and power generation industries.

Aerospace & Gas Turbines:

Turbine Blades and Vanes (in early jet engines)

Combustion Chambers and Liners

Exhaust Systems

Afterburner components

Turbine Disks

Power Generation:

Gas turbine components

Heat treatment fixtures and baskets

Nuclear engineering components

Other Industrial Applications:

Fasteners and bolts for high-temperature service

Springs (when high-temperature performance is needed)

Hot-working tools and dies

Chemical processing equipment

Nimonic 75 vs Other High-Temperature Alloys

Property / Alloy	Nimonic 75	Nimonic 80A	Inconel 600	Hastelloy X
Base System	Ni-Cr	Ni-Cr-Ti-Al	Ni-Cr-Fe	Ni-Cr-Fe-Mo
Strength at 800°C	Medium	High	Medium	High
Oxidation Resistance	High	Very High	High	Very High
Creep Resistance	Medium	High	Medium	High
Weldability	Good	Moderate	Excellent	Good
Cost Level	Medium	High	Medium	High
Main Advantage	Stability + oxidation resistance	Highest strength	General-purpose	Extreme high-temp resistance

Nimonic 75 → best for stable oxidation resistance applications

Nimonic 80A → better for load-bearing turbine parts

Inconel 600 → best for general corrosion + fabrication

Hastelloy X → best for extreme high-temperature aerospace use

👉 This makes Nimonic 75 a balanced cost-performance solution for industrial furnace and aerospace secondary components.

Advantages of Nimonic 75 Alloy

Excellent oxidation resistance up to 800°C

Stable mechanical properties under thermal cycling

Good weldability and machinability

Reliable long-term service performance

Cost-effective compared to higher-grade superalloys

Fabrication & Processing Guide

Welding

TIG welding recommended

Pre-cleaning required to avoid oxidation

Post-weld stress relief recommended

Heat Treatment

Solution treatment improves stability

Controlled cooling prevents grain boundary oxidation

Machining

Requires carbide tooling

Low cutting speed recommended

Coolant essential to avoid work hardening

FAQ

Q1: What is Nimonic 75 alloy used for?

Nimonic 75 is mainly used in aerospace gas turbines, industrial furnace components, heat treatment fixtures, and high-temperature mechanical parts where oxidation resistance is required.

Q2: What is the maximum service temperature of Nimonic 75?

Nimonic 75 can operate continuously at temperatures up to approximately 800°C (1472°F) while maintaining stable mechanical properties.

Q3: Is Nimonic 75 resistant to oxidation?

Yes. Due to its high chromium content, Nimonic 75 offers excellent resistance to oxidation and scaling in high-temperature environments.

Q4: How does Nimonic 75 compare with Inconel 600?

Nimonic 75 provides better high-temperature stability and oxidation resistance, while Inconel 600 offers better general corrosion resistance and easier fabrication.

Q5: Can Nimonic 75 be welded?

Yes, it has good weldability. TIG welding is commonly recommended with proper surface cleaning and post-weld treatment.

Q6: What industries use Nimonic 75 most?

It is widely used in:

Aerospace engineering

Power generation turbines

Heat treatment industry

Industrial furnace manufacturing

Q7: What are the key advantages of Nimonic 75?

High-temperature oxidation resistance