UNS N0660 is a nonmagnetic, nickel-chromium alloy. The high nickel content gives the alloy resistance to corrosion by many organic and inorganic compounds and also makes it virtually immune to chloride-ion stress-corrosion cracking. Chromium confers resistance to sulfur compounds and also provides resistance to oxidizing conditions at high temperatures or in corrosive solutions. The alloy also has excellent mechanical properties, high strength and good workability. But the alloy is not precipitation hardenable; it is hardened and strengthened only by cold work. The versatility of Inconel 600 has led to its use in a variety of applications involving temperatures from cryogenic to above 2000°F (1095°C).

Inconel 600, which contains a minimum of 72% nickel and 14% chromium, makes it superior to commercially pure nickel under oxidizing conditions, and possesses the ability to resist a variety of corrosives. It's high nickel content enables it to retain considerable resistance under reducing conditions, and also provides excellent resistance to alkaline solutions and strongly oxidizing acid. However, the oxidizing effect of dissolved air alone is not sufficient to insure complete passivity and freedom from attack by air-saturated mineral acids and certain concentrated organic acids.

The behavior of the alloy during heating is governed by a number of interacting variables: amount of cold work, grain size, chemical composition, and dimensions of the material. Consequently, times and temperatures for heat treatment are usually experimentally determined.

In general, grain growth in Inconel 600 does not occur until the alloy is heated to about 1800°F (980° C). At that temperature, the finely dispersed carbide particles in the alloy ’ s microstructure, which inhibit grain growth, begin to coalesce. Solution of the carbides begins at about 1900° F (1040°C). Treatment for 1 to 2 hr at 2000° to 2100°F (1090° to 1150°C) dissolves the carbides completely and results in increased grain size. This solution treatment is beneficial in obtaining maximum creep and rupture strength.

Same as all nickel-base alloys, Inconel 600 must be clean before it is heated and must be heated in a sulfur-free atmosphere. Furnace atmosphere for forging or open annealing should be slightly reducing to prevent excessive oxidation. If a bright surface is required, the alloy can be bright-heated only in very dry hydrogen or in a vacuum and usually must be pickled.

The cooling rate after heating has minimal impact on the mechanical properties of Inconel 600. However, the alloy is subject to carbide precipitation in the 1000 ° to 1400 ° F (540 to 760 ° C) temperature range and should be rapidly cooled through that range if the material is to be pickled or used in an environment requiring freedom from sensitization.

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