Introduction
INCONEL® (nickel-chromium-iron) alloy 600 (UNS N06600/W.Nr. 2.4816) is a standard engineering material for applications which require resistance to corrosion and heat. The alloy also has excellent mechanical properties and presents the desirable combination of high strength and good workability. The limiting chemical composition of INCONEL alloy 600 is shown in Table 1. 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.
The versatility of
INCONEL alloy 600 has led to its use in a variety of applications involving temperatures from cryogenic to above 2000F(1095C).
The alloy is used extensively in the chemical industry for its strength and corrosion resistance. Applications include heaters, stills, bubble towers and condensers for processing of fatty acids; evaporator tubes, tube sheets and flaking trays for the manufacture of sodium sulfide; and equipment for handling abietic acid in the manufacture of paper pulp.
The alloy's strength and oxidation resistance at high temperatures make it useful for many applications in the heat-treating industry. It is used for retorts, muffles, roller hearths and other furnace components and for heat-treating baskets and trays.
INCONEL alloy 600 is used in the electronic field for such parts as cathode-ray tube spiders, thyratron grids, tube support members and springs. The alloy is a standard material of construction for nuclear reactors. It has excellent resistance to corrosion by high-purity water, and no indication of chloride-ion stress-corrosion cracking in reactor water systems has been detected. For nuclear applications, the alloy is produced to exacting specifications and is designated
INCONEL alloy 600T.
Hot and Cold Forming
The normal hot-working temperature range for INCONEL alloy 600 is 1600 to 2250F (870 to 1230C).
Heavy hot work should be done between 1900 and 2250F (1040 and 1230C); light work can be continued down to 1600F (870C).
The alloy has low ductility at temperatures between 1200 and 1600F (650 and 870C) and should not be worked in that range.
High tensile properties can be developed in the material by careful working at temperatures below 1200F (650C).
INCONEL alloy 600 is cold-formed by the standard processes used for steel and stainless steel.
Working Instructions
INCONEL alloy 600 is readily fabricated by either hot or cold working and can be joined by standard welding, brazing, and soldering processes. Although the alloy can be hardened and strengthened only by cold work, a wide range of mechanical properties can be obtained in finished parts by combining cold work and thermal treatments.
Corrosion Resistance
The composition of INCONEL alloy 600 enables it to resist a variety of corrosives. The chromium content of the alloy makes it superior to commercially pure nickel under oxidizing conditions, and its high nickel content enables it to retain considerable resistance under reducing conditions.
The nickel content also provides excellent resistance to alkaline solutions.
The alloy has fair resistance to strongly oxidizing acid solutions.
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.
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