Inconel X-750 vs Inconel 625 vs Inconel 718: A Comprehensive Comparison

Gnee Steel is a professional manufacturer of Inconel 718 alloy. Gnee Steel's Inconel 718 alloy packaging includes: steel strapping: pipes with an outer diameter not exceeding 3 inches are typically bundled together with polypropylene film to prevent rusting during sea transport, then secured with steel straps; wooden crates/crates: pipes are usually packed in wooden crates or crates for protection during transport, especially for longer or larger diameter pipes; seaworthy export packaging: suppliers typically use standard seaworthy export packaging methods, which may include various materials and techniques to protect the pipes during transport; and tarpaulin packaging: to prevent rainwater, seawater, etc., from seeping into the export wooden crate packaging during transport. Gnee Steel specializes in the production and sales of alloy materials. Gnee Steel's Inconel 718 is widely used in aerospace, chemical, power, automotive, and nuclear energy fields, and customized alloy material solutions can be provided according to customer needs. 

 
Inconel X-750 vs Inconel 625 vs Inconel 718 A Comprehensive Comparison

Inconel X-750 vs Inconel 625 vs Inconel 718: A Comprehensive Comparison

 

Inconel 718, 625, and X-750 are high-performance nickel-based superalloys suitable for extreme environments. Inconel 718 is the material of choice for high-strength aerospace fasteners and turbine components (up to 700°C). Inconel 625 offers excellent corrosion resistance, making it particularly suitable for marine and chemical processing environments. Inconel X-750 is specifically designed for high-stress, high-temperature (up to 816°C) applications, such as springs and gas turbines.

Is Inconel X-750 magnetic?

 

This material has excellent relaxation resistance and is non-magnetic. Its high-temperature strength reaches 1300ºF (700°C), and its oxidation resistance reaches 1800ºF (983˚C). Inconel X-750 resists corrosion from a variety of industrial corrosives under both oxidizing and reducing conditions.

Inconel X-750

Inconel X-750, Inconel 625, and Inconel 718 are all nickel-chromium-based superalloys renowned for their exceptional strength, corrosion resistance, and tolerance to extreme environments. While they share many similarities, each alloy possesses unique properties and applications, making it suitable for specific uses, particularly in the aerospace, chemical, and power generation industries. The following is a detailed comparison of these three superalloys.

 

Inconel X-750, Inconel 625 and Inconel 718 factory

Inconel X-750, Inconel 625 and Inconel 718 factory

 

Chemical composition of Inconel X-750, Inconel 625 and Inconel 718

Element Inconel X-750 Inconel 625 Inconel 718
Nickel (Ni) 70% min 58-63% 50-55%
Chromium (Cr) 14-17% 20-23% 17-21%
Iron (Fe) Balance Balance Balance
Molybdenum (Mo) 2.5-3.0% 8-10% 2.8-3.3%
Niobium (Nb) 0.5-1.0% 3.0-4.0% 4.75-5.5%
Titanium (Ti) None 0.4-0.7% 0.65-1.15%
Carbon (C) ≤0.05% ≤0.10% ≤0.08%

 

Mechanical Properties for Inconel X-750, Inconel 625 and Inconel 718

Property Inconel X-750 Inconel 625 Inconel 718
Yield Strength (MPa) 600 – 1,100 380 – 830 970 – 1,380
Ultimate Tensile Strength (MPa) 700 – 1,100 700 – 1,200 1,270 – 1,380
Elongation (%) 30% (min) 30% (min) 15% (min)
Hardness (Rockwell B) 35-42 40-50 40-44

 

High-Temperature Performance of Inconel X-750, Inconel 625 and Inconel 718

Feature Inconel X-750 Inconel 625 Inconel 718
Service Temperature Up to 1,400°F (760°C) Up to 1,800°F (982°C) Up to 1,300°F (700°C)
Oxidation Resistance Excellent Excellent Good
Creep Resistance Excellent with additional stability Very good Very good

 

Corrosion Resistance of Inconel X-750, Inconel 625 and Inconel 718

Corrosion Type Inconel X-750 Inconel 625 Inconel 718
General Corrosion Excellent Excellent Very good
Pitting Corrosion Excellent Excellent Very good
Stress Corrosion Cracking Good Excellent Moderate
Acid Resistance Very good Excellent Good (in moderate concentrations)

 

Typical Applications for Inconel X-750, Inconel 625 and Inconel 718

Application Area Inconel X-750 Inconel 625 Inconel 718
Aerospace Industry Gas turbines, combustion chambers Aerospace components under high thermal stress Turbine engines, structural components
Chemical Processing Heat exchangers, aerospace valves Chemical processing equipment High-temperature reactors
Oil and Gas Downhole tubing and valves Components for oil and gas extraction Oil and gas processing equipment
Power Generation Boiler tubes, components Turbines and heat exchangers Gas and steam turbine components
Marine Applications Components in aggressive environments Marine applications due to excellent corrosion resistance Less common but used when required

 

Typical Applications for Inconel X-750, Inconel 625 and Inconel 718

Typical Applications for Inconel X-750, Inconel 625 and Inconel 718

Conclusion

Inconel X-750, Inconel 625, and Inconel 718 each possess unique properties suitable for different applications.

Inconel X-750 is ideal for high-temperature, high-stress environments, particularly in the power generation and oil and gas industries.

Inconel 625 offers excellent corrosion resistance and high-temperature strength, making it ideal for marine and chemical applications.

Inconel 718 is renowned for its superior mechanical properties and is the preferred material for turbine components and structures in the aerospace industry.

 

Choosing the right alloy is crucial for optimizing performance and ensuring component lifespan in harsh environments. For any questions or further assistance, please feel free to contact Gnee Steel!

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Why Choose Gnee as Your Nickel-Based Alloy Supplier

✅ Over 18 years of export experience, products sold to more than 80 countries

✅ Certified by ISO, SGS, and BV

✅ Global inventory of Inconel, Hastelloy, Incoloy, and Monel alloy tubing, plates, and bars

✅ Custom processing services available – including cutting, polishing, CNC machining, and packaging

✅ Fast delivery within 7-15 days, supported by global logistics partners

📦 Packaging and Shipping

All stainless steel products are packaged using the following methods:

Wooden pallets or crates

Moisture-proof packaging

Labels with furnace number, standard, and size labels

Shipped worldwide by sea, air, or express

Gnee Steel
 
 

About Gnee Steel

Gnee Steel is a professional manufacturer of nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy 800, Incoloy 800H/HT, Incoloy 825, Monel 400, Monel K500, and other high-temperature alloy materials. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power generation, automotive, nuclear energy, and other fields, and we can provide customized alloy material solutions according to customer needs. For inquiries about alloy material prices or customized alloy material solutions, please feel free to contact us via email at ss@gneemetal.com for a quote.

 
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