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Views: 1 Author: Wang Publish Time: 2024-09-10 Origin: Site
Inconel 600, also known as Alloy 600, with the UNS designation N06600 and W. Nr. 2.4816, is a popular nickel-chromium-iron alloy known for its excellent resistance to high temperatures and corrosion. It is often used in applications that involve exposure to extreme heat and aggressive environments, such as in the aerospace, chemical processing, and nuclear industries. The alloy's properties make it well-suited for use in furnace components, chemical processing equipment, and heat treating fixtures. Additionally, Inconel 600 exhibits good mechanical properties and is easily formed, making it a versatile material for various engineering applications.
Inconel 600 was designed for service temperatures from cryogenic to elevated temperatures in the range of 2000° F. It is non-magnetic, has excellent mechanical properties, and presents the desirable combination of high strength and good weldability under a wide range of temperatures. The high nickel content in Inconel 600 enables it to retain considerable resistance under reducing conditions, makes it resistant to corrosion by a number of organic and inorganic compounds, gives it excellent resistance to chloride-ion stress-corrosion cracking and also provides excellent resistance to alkaline solutions. Typical applications of this nickel alloy include the chemical, pulp and paper, aerospace, nuclear engineering and heat treating industries.
The high nickel content of the Inconel 600 enables it to retain considerable resistance under reducing conditions and makes it resistant to corrosion by a number of organic and inorganic compounds. The nickel content gives it excellent resistance to chloride-ion stress-corrosion cracking and also provides excellent resistance to alkaline solutions. Its chromium content gives the alloy resistance to sulfur compounds and various oxidizing environments. The chromium content of the alloy makes it superior to commercially pure nickel under oxidizing conditions. In strong oxidizing solutions like hot, concentrated nitric acid, 600 has poor resistance. Alloy 600 is relatively un-attacked by the majority of neutral and alkaline salt solutions and is used in some caustic environments. The alloy resists steam and mixtures of steam, air and carbon dioxide.
Alloy 600 is non-magnetic, has excellent mechanical properties and a combination of high strength and good workability and is readily weldable. Inconel 600 exhibits cold forming characteristics normally associated with chromium-nickel stainless steels. Typical corrosion applications include titanium dioxide production (chloride route), perchlorethylene syntheses, vinyl chloride monomer (VCM), and magnesium chloride. Alloy 600 is used in chemical and food processing, heat treating, phenol condensers, soap manufacture, vegetable and fatty acid vessels and many more.
Element | Percent |
Nickel (plus Cobalt) (Min) | 72 |
Chromium | 14-17 |
Iron | 6-10 |
Carbon (Max) | .15 |
Manganese (Max) | 1 |
Sulfur (Max) | .015 |
Silicon (Max) | .5 |
Copper (Max) | .5 |
One of the reasons that Inconel 600 is a standard material in a number of different industries is thanks to its superior corrosion resistance. The inclusion of chromium (approximately 14-17%) in the alloy’s composition gives it fantastic resistance to oxidising conditions at both high temperatures and in corrosive solutions. The chromium also gives the material resistance to sulphuric compounds. The material has a very high nickel content, which contributes to its resistance in reducing environments, as well as alkaline solutions.
The high nickel content has another very notable benefit for this particular alloy. A common problem with austenitic chromium-nickel stainless steels is that they fail due to stress-corrosion cracking when in an environment containing chlorides, among other conditions. These factors can include stress, water and dissolved oxygen.When the nickel content of austenitic alloys is increased, this tendency decreases. As INCONEL Alloy 600 has a minimum of 72% nickel content, it is almost completely immune to this chloride-ion stress-corrosion cracking. There are still some conditions that may cause stress-corrosion cracking, such as in the presence of high temperature, high-strength caustic alkalies, but proper stress-relief treatment prior to use can help to combat this.
Stress-corrosion cracking could still occur in situations when mercury is present at higher temperatures, but again there are solutions to this problem that involve correct stress-relief procedures. This is why it’s so important for design engineers who are selecting a material for an industrial project know what external elements and what temperatures the alloy will be exposed to, to ensure it’s properly treated for its intended end application.
Alloy 600 is not an age hardening alloy; cold working is the only available means of hardening. Softening by annealing begins at about 1600°F (871°C), and is reasonably complete after 10 to 15 minutes of heating at 1800°F (982°C). Above this temperature, grain growth may be objectionable, although very brief heating at 1900°F will cause complete softening without undue grain growth. Since the rate of cooling has no effect on the softening, the material may be water quenched or air cooled.
Low sulfur reducing furnace atmospheres should be used in forging. Major hot working should be done between 2300/1850°F, while light working may be continued as low as 1600°F. No hot working should be attempted between 1600/1200°F due to lower ductility in that range.
Alloy 600 is machinable in both the hot worked and annealed conditions. Because considerable heat is generated in machining this alloy, high-speed steel, cast nonferrous or cemented carbide tools should be used. The tools should be kept sharp. Lathe turning speeds with high-speed and nonferrous tools are 35/45 sfm (0.18/0.23 m/s); speeds with cemented carbide tools are 100/175 sfm (0.51/0.89 m/s). (This data should be used as a guide for initial machine setup only. The figures used are averages. On certain work, the nature of the part may require adjustment of speeds and feeds.) Sulfur-based oil should be used as a lubricant, but should be completely removed before the machined part is exposed to elevated temperatures, as in welding.
Inconel 600 is used widely in the chemical industry, thanks to its strength and high corrosion resistance. Typical uses in this industry include heaters, stills, bubble towers, and processing condensers for fatty acids as well as tube, tube sheets, and flaking trays for producing sodium sulfide and for equipment handling abietic acid in producing pulp and paper goods. When heated, Inconel alloys form a thick yet stable oxide layer, which protects surfaces from increased attack.
Alloy 600 is also used in many applications in the heat-treating industry. The alloy’s strength and corrosion resistance at high temperatures make it ideal for furnace components, including mufflers, retorts, roller hearths, and heat-treating baskets and trays. Plus, Inconel 600 is used in aeronautics for engine and airframe components that need to withstand high temperatures like lockwire, turbine seals, and exhaust liners.
Alloy 600 is standard construction material in building nuclear reactors. It provides excellent corrosion resistance by high purity water, with no indication of chloride-ion stress-corrosion cracking in reactor water systems. JN Alloy can produce many products of inconel 600, including steel pipes, steel plates, round bars, flanges and various pipe fittings. You can consult us for any needs.
