What is the temperature limit for Inconel 600?
Alloy 600 is a non-magnetic nickel-based high temperature alloy that exhibits excellent properties such as high strength, hot and cold workability, and resistance to general corrosion.
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The high chromium content of Alloy 600 makes it much more resistant to oxidation than pure nickel, while its high nickel content provides good corrosion resistance under reducing conditions.
Alloy 600 is not an age-hardenable alloy; cold working is the only available hardening method. Annealing softening begins at about 1600 degree F (871 degree ) and is essentially complete after heating at 1800 degree F (982 degree ) for 10 to 15 minutes. Above this temperature, grain growth may be objectionable, but very brief heating at 1900 degree F results in complete softening without excessive grain growth. Since the cooling rate has no effect on softening, the material can be water quenched or air cooled.
A low-sulfur reducing furnace atmosphere should be used for forging. Major hot working should be performed between 2300/1850 degree F, while light working may be continued at temperatures as low as 1600 degree F. Hot working should not be attempted between 1600/1200 degree F because of the lower ductility in this range.
Alloy 600 can be machined in both the hot-worked and annealed conditions. Because machining this alloy generates considerable heat, high-speed steel, cast nonferrous, or carbide tools should be used. Tools should be kept sharp.
Lathe turning speeds are 35/45 sfm (0.18/0.23 m/s) with high-speed and nonferrous tools; 100/175 sfm (0.51/0.89 m/s) with carbide tools. (This data should be used as a guide only for initial machine settings. The figures used are averages. The nature of the part may require adjustment of speeds and feeds in some jobs.)
Sulfur-containing oils should be used as lubricants but should be completely removed before exposing machined parts to high temperatures (such as welding).
For improved properties, Alloy 600 can be cold worked to temperatures below 1200 degree F (649 degree ).
Alloy 600 can be joined by common welding, brazing, and soldering processes.
