Guide to Using Inconel Alloy 600

1.Good corrosion resistance property for the reduction, oxidation, Nitric and other media.

2.Good stress corrosion cracking resistance property in both room temperature and high temperature.

3.Good corrosion resistance of the dry chlorine and chlorine hydride.

4.Good mechanical property when below zero, room temperature and high temperature.

5.Good anti-creep rupture strength, with the recommendation of 700℃ or above working environment.

Inconel alloy 600 is widely used in the furnace and heattreating fields for retorts, boxes, muffles, wire belts, roller hearths, and similar parts which require resistance to oxidation and to furnace atmospheres. The alloy is the standard material for nitriding containers because of its resistance to nitrogen at high temperatures.

 

Inconel alloy 600 resists attack by sulfur compounds at moderate temperatures, but it is subject to sulfidation in high-temperature, sulfur-containing environments. Molybdenum disulfide, a lubricant sometimes used to aid parts assembly, should not be used if the material will be subsequently exposed to temperatures above 800°F (427°C).

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.

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.

Inconel alloy 600, like all nickel-base alloys, 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.

 

The rate of cooling after heating has little effect on the mechanical properties of Inconel alloy 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. The alloy can be bright-heated only in very dry hydrogen or in a vacuum and usually must be pickled if a bright surface is required.

The normal hot-working temperature range for Inconel alloy 600 is 1600° to 2250°F (870° to 1230°C). Heavy hot work should be done between 1900° and 2250°F (1040° and 1230°C); light work can be continued down to 1600°F (870°C). The alloy has low ductility at temperatures between 1200° and 1600°F (650° and 870°C) and should not be worked in that range.

 

High tensile properties can be developed in the material by careful working at temperatures below 1200°F (650°C).

Inconel alloy 600 is cold-formed by the standard processes used for steel and stainless steel.

Inconel alloy 600 is slightly more machinable than Type 304 stainless steel and slightly less machinable than Type 303 free-machining stainless steel.

 

The alloy is best handled on heavy-duty equipment using cutting tools large and heavy enough to withstand the loads and to quickly dissipate the heat generated. Tools must be sharp and have the proper geometry.

 

Inconel alloy 600 is readily joined by conventional welding processes. Welding materials for joining alloy 600 are INCONEL Welding Electrode 182 for shielded metal-arc welding*, INCONEL Filler Metal 82 for gas tungsten-arc and gas metal-arc welding, and INCONEL Filler Metal 82 and INCOFLUX 4 Submerged Arc Flux for the submerged-arc process.

 

Welds made with INCONEL Welding Electrode 182 may have decreased ductility after extended exposure to temperatures of 1000° to 1400°F (540° to 760°).