Among the many corrosion-resistant alloys, Monel 400 and Inconel 600 are undoubtedly the two most well-known. They both have excellent corrosion resistance, but due to their different compositions, they exert their own advantages in different areas. This article will compare these two alloys in detail from 10 aspects to help you better understand their characteristics and applications.
1. Principles of alloy composition and corrosion resistance
1. Monel 400: Nickel-copper alloy, corrosion resistance mainly comes from copper. Copper has corrosion resistance at room temperature that most metals do not have, especially in flowing seawater. This corrosion resistance makes Monel 400 irreplaceable in marine applications. However, copper oxidizes easily at high temperatures, so Monel 400 is rarely used in high-temperature corrosion-resistant applications.
2. Inconel 600: Nickel-chromium-iron alloy, corrosion resistance mainly comes from chromium. Chromium itself can be oxidized, but after oxidation, chromium oxide will form a protective film on the surface of the alloy to isolate the oxide and the alloy, thus preventing further oxidation of the alloy. This antioxidant effect is also effective at high temperatures.
2. Application fields
1. Monel 400: Mainly used in room temperature marine applications, such as ships, marine engineering, seawater treatment, etc.
2. Inconel 600: More used in high temperature applications, such as petrochemical, aerospace, nuclear energy and other fields.
3. Product form
1. Monel 400: wire rod, wire rod, filler metal, welding rod, etc.
2. Inconel 600: Seamless pipes and pipes, welded pipes and pipes, capillary pipes, coiled pipes, thick-walled pipes, elbows, flanges, reducers, tees, pipe caps, round steel and bars, flat steel, square steel Steel, hexagonal steel, sheet, plate, coil, strip, wire rod, pole, filler metal, welding rod, etc.
4. Main standards
1. Monel 400: ASTM B163, ASTM B165, ASTM B829, ASTM B725, ASTM B775, ASTM B730, ASTM B751, ASTM B366, ASTM B164, ASTM B564, ASTM B127, etc.
2. Inconel 600: ASTM B163, ASTM B167, ASTM B829, ASTM B517, ASTM B775, ASTM B516, ASTM B751, ASTM B366, ASTM B166, ASTM B564, ASTM B168, ASTM B906, etc.
5. Price
The price difference between the two alloys is very small because they have different application areas and cannot be substituted for each other.
6. Strength
Overall, both Monel 400 and Inconel 600 are not very strong. But compared with copper, chromium has a more obvious solid solution strengthening effect. Therefore, the strength of Inconel 600 is higher than that of Monel 400, which also ensures the stability of Inconel 600 in high temperature environments.
7. Thermal expansion coefficient
1. The linear thermal expansion coefficient of Monel 400 is 13.9 x 10^-6/℃.
2. The linear thermal expansion coefficient of Inconel 600 is 13.3 x 10^-6/℃.
Therefore, in the same temperature range, the linear thermal expansion coefficient of Inconel 600 is slightly lower than that of Monel 400, which helps to reduce stress and thermal deformation.
8. Heat treatment
1. Monel 400: Monel 400 can be heat treated to gain higher strength, but this will reduce its toughness and corrosion resistance. Therefore, Monel 400 is usually not heat treated.
2. Inconel 600: Inconel 600 can obtain different structures and properties through solution treatment and heat treatment. Solution treatment can improve its strength, and heat treatment can improve its corrosion resistance.
9. Welding performance
1. Monel 400: Monel 400 has good welding performance and can be used with various welding methods such as TIG, MIG, and arc welding.
2. Inconel 600: Inconel 600 has poor welding performance and is prone to cracks and deformation. Therefore, special welding processes and measures need to be taken, such as preheating, post-heat treatment, etc.
10. Corrosion resistance
1. Monel 400: Monel 400 has excellent corrosion resistance in seawater, salt water and some organic acid and alkali solutions. However, Monel 400 has poor corrosion resistance in strong acid and oxidizing environments.
2. Inconel 600: Inconel 600 has a wide range of corrosion resistance, including in highly corrosive environments such as seawater, salt water, nitric acid, hydrofluoric acid, and chloride solutions. It also has excellent antioxidant properties and performs well in high-temperature oxidizing environments.
To sum up, Monel 400 and Inconel 600 are both excellent corrosion-resistant alloys with their own advantages and scope of application. The choice of alloy should be evaluated and selected based on the specific application environment and requirements.
Tianjin Anton Metal Manufacture Co., Ltd. is a company specializing in the production of various nickel-based alloys, Hastelloy alloys and high-temperature alloy materials. The company was established in 1989 with a registered capital of 10.0 million, specializing in the production and sales of alloy materials. Anton Metal’s products are widely used in aerospace, chemical industry, electric power, automobile, nuclear energy and other fields, and can also provide customized alloy material solutions according to customer needs. If you need to know the price consultation of alloy materials or provide customized alloy material solutions, please feel free to contact the sales staff.
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Post time: Dec-20-2023
