Designated as UNS N06600 or W.Nr. 2.4816, Inconel 600, also known as Alloy 600, is a nickel-chromium-iron alloy with good oxidation resistance at high temperatures and resistance to chloride ion stress-corrosion cracking, corrosion by high-purity water, and caustic corrosion. It is mainly used for furnace components, in chemical and food processing, in nuclear engineering, and for sparking electrodes. Inconel 600 (76Ni-15Cr-8Fe) is the basic alloy in the Ni-Cr-Fe system in which the high nickel content makes it resistant to reducing environments.

• This nickel alloy 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.
• Alloy 600 can be both hot formed and cold formed using typical processes. Hot working should be performed between 1600° F and 2250° F avoiding any work between1200-1600° F because the ductility decreases in this temperature range.
• Welding Alloy 600 can be achieved via shielded metal-arc welding, TIG, and MIG.
• Corrosion Resistance: With 72% minimum nickel, this alloy is resistant to many organic and inorganic compounds and also offers good corrosion resistance in reducing conditions. The high nickel content lowers the chances for stress corrosion cracking for this alloy in the annealed condition. The high nickel content also improves resistance to carburizing, nitriding and thermal fatigue, while maintaining an austenitic structure so it retains ductility. Increased chromium in the alloy offers high temperature resistance to sulfur compounds as well as resistance to oxidizing compounds at elevated temperatures or in corrosive media. Alloy 600 has excellent resistance to alkalies and is one of the few materials suitable for use in strong solutions of magnesium chloride at elevated temperatures. Typical corrosion in MgCl₂ is roughly 1 mpy. When applicable, material for severe service should be fully stress relieved prior to use.
• Fabrication and Heat Treatment: Alloy 600 can be hot or cold formed using typical processes. Hot working should be performed between 1600°F and 2250°F, avoiding any work between 1200°F and 1600°F as the ductility decreases in this temperature range. The cold work hardening rate is less than 304 stainless steel yet higher than mild steel. Welding alloy 600 can be achieved via shielded metal-arc welding using AWS ENiCrFe-3 electrode. Filler metal AWS ERNiCr-3 can be used when TIG and MIG welding. Alloy 600 is slightly more machinable compared to 304 stainless steel and should be performed with tooling large enough to handle the loads. Alloy 600 machining requires heavy-duty equipment along with sharp tooling and proper cutting fluids. Annealing of alloy 600 without excessive grain growth can be performed at 1850°F for 15 minutes at temperature. Fine grain material typically has better corrosion resistance and higher tensile, fatigue and impact properties.