Comparison of Nitronic 50 and Inconel 718 alloys
Comparison of Nitronic 50 and Inconel 718 alloys
Nitronic 50 is a high-strength austenitic stainless steel with excellent corrosion resistance; while Inconel 718 is a nickel-based superalloy known for its high strength and high-temperature resistance. Nitronic 50 is generally more suitable for corrosive environments, is non-magnetic, and performs well at low temperatures. Inconel 718 performs excellently at high temperatures, maintaining its strength up to 650°C (1200°F), making it suitable for high-stress, high-temperature applications.
Why is Inconel 718 difficult to machine?
Inconel 718 nickel-based superalloys exhibit excellent properties at high temperatures, making them widely used in the aerospace, marine, and automotive industries. However, Inconel 718 has poor thermal conductivity and is prone to rapid strain hardening, resulting in poor machinability and poor surface finish.
Nitronic 50 and Inconel 718 are both high-performance alloys renowned for their exceptional strength, corrosion resistance, and high-temperature stability. While both are used in similar industries such as aerospace, chemical, and marine, their compositions, properties, and characteristics differ. Below is a detailed comparison of Nitronic 50 and Inconel 718:
1. Composition
- Nitronic 50:
Nitronic 50 is a high-strength stainless steel alloy, primarily composed of iron, with significant amounts of chromium (20-23%), nickel (8-12%), and manganese (10-14%). It also contains trace amounts of silicon and nitrogen, which contribute to its strength, corrosion resistance, and oxidation resistance, especially in marine environments. The high manganese content gives it excellent wear resistance and anti-adhesion properties.
- Inconel 718:
Inconel 718 is a nickel-chromium-based superalloy, composed of approximately 50-55% nickel, 17-21% chromium, and trace amounts of iron, molybdenum, niobium, titanium, and aluminum. The combination of nickel and chromium imparts it with superior high-temperature and corrosion-resistant properties. This alloy is strengthened through a precipitation hardening process, thereby improving its strength at high temperatures.
2. Temperature Resistance
- Nitronic 50:
Nitronic 50 exhibits good high-temperature resistance, capable of withstanding temperatures up to approximately 1,600°F (871°C). However, compared to Inconel 718, its temperature resistance is lower, making it more suitable for medium to high temperature environments and therefore less suitable for extreme high-temperature applications.
- Inconel 718:
Inconel 718 is designed for extreme high-temperature applications, capable of withstanding temperatures up to 1,300°F to 1,400°F (704°C to 760°C) without a significant reduction in mechanical properties. Even at such high temperatures, it maintains excellent strength and oxidation resistance, making it commonly used in jet engines, gas turbines, and other high-temperature environments.
3. Corrosion Resistance and Oxidation Resistance
- Nitronic 50:
Nitronic 50 exhibits excellent corrosion resistance in a variety of environments, including marine and acidic environments. Its high manganese content gives it excellent resistance to pitting and crevice corrosion, making it ideal for seawater and chemical environments. Furthermore, it exhibits good oxidation resistance at moderate temperatures.
- Inconel 718:
Inconel 718 possesses excellent oxidation and corrosion resistance, especially in high-temperature environments. It demonstrates strong resistance to oxidation, sulfidation, and corrosion in extreme environments, including high-temperature oxidizing and acidic conditions. Inconel 718 is particularly effective in high-temperature gas environments and environments involving contact with corrosive chemicals.
4. Mechanical Properties
- Nitronic 50:
Nitronic 50 possesses a high tensile strength of approximately 95,000 psi (655 MPa) and excellent wear resistance due to its high manganese content. While it exhibits high strength and good toughness at room temperature, its strength at high temperatures is inferior to Inconel 718. Nitronic 50 also demonstrates excellent resistance to adhesive wear, making it ideal for high-wear applications.
- Inconel 718:
Inconel 718 is renowned for its exceptional strength and toughness, particularly at high temperatures. Its ultimate tensile strength at room temperature is approximately 1,270 MPa (185,000 psi), and it retains much of its strength even at temperatures up to 1,200°F (649°C). Its creep resistance, fatigue strength, and ability to withstand extreme mechanical stresses make it a preferred alloy for aerospace and high-performance engineering applications.
5. Application Areas
- Nitronic 50:
- Marine Applications (ship shafts, propeller blades, offshore platforms)
- Chemical Processing (valves, pumps, heat exchangers)
- Food Processing (equipment exposed to corrosive environments)
- Wear-resistant Parts (machinery parts, fasteners)
- Automotive Parts (exhaust systems)
- Inconel 718:
- Aerospace (jet engine parts, turbine blades, exhaust systems)
- Gas Turbines and Power Plants (high-temperature components)
- Nuclear Reactors (reactor core, high-pressure systems)
- Chemical Reactors (high stress, high-temperature environments)
- Rocket Engine Parts (resistant to extreme high temperature and pressure)
| Feature | High-strength austenitic stainless Steel | Nickel-based superalloy |
|---|---|---|
| Material Type | High-strength austenitic stainless steel | Nickel-based superalloy |
| Corrosion Resistance | Excellent, especially in saltwater and acidic environments | High, but generally used in more aggressive environments where high-temperature strength is also needed |
| High-Temperature Strength | Good, but not its primary advantage | Excellent; retains properties up to 650°C (1200°F) |
| Magnetic Properties | Non-magnetic, even when cold-worked | Magnetic (Curie temperature around −112°C or −170°F) |
| Cryogenic Properties | Outstanding | Good |
| Key Applications | Marine hardware, pumps, valves, chemical processing equipment, non-magnetic surgical tools | Oil and gas components (wellheads, downhole tools), aerospace parts, high-stress fasteners, jet engines |
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 is a supplier of Inconel 718 alloy, offering a wide range of products including: seamless pipe (sizes: 4-219 mm; thickness: 0.5-20 mm); welded pipe (sizes: 5.0-1219.2 mm; thickness: 0.5-20 mm); plates (thickness: 0.1 to 100 mm; width: 10-2500 mm); strips; alloy round bars (diameter: 3-800 mm); flat bars (thickness: 2-100 mm; width: 10-500 mm); hexagonal bars (size: 2-100 mm); wire rods; and extruded profiles. We collaborate with steel mills to provide our customers with Inconel 718 alloy products that meet or exceed numerous leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN, and BS standards.
Gnee Steel stocks and sells Inconel 718, pipes, plates, strips, round bars, flat bars, forged billets, hexagonal steel, wire rods, and extruded profiles. Please feel free to contact us at ss@gneesteel.com for a quote.
