Heat Resistant Alloys

NAS 600

  • JISNCF 600
  • UNSN06600
  • DIN/EN2.4816
, comparable to Inconel® 600 Alloy

NAS 600 (NCF 600, UNS N06600) is a nickel-chromium alloy that provides excellent resistance to oxidation at high temperatures. It is also commonly used as a corrosion resistant alloy due to its resistance against a range of acids and alkalis. Nippon Yakin supplies this product in plate, sheet, and strip forms.

*Inconel is a registered trademark of Special Metals Corporation.

Products & Materials

NAS 600ProductsPDF(606KB)

Chemical Composition 77Ni-16Cr-6Fe
Product shape
Workability Hot working is relatively easy with NAS 600. For hot working, temperature should be between 1000 and 1180℃, although light work may be done at temperature as low as 850℃. The range between 650 and 850℃ should be avoided as cracking may occur. Cold workability is easier than austenitic stainless steels, similar to Monel.
Weldability As with standard austenitic stainless steels, NAS 600 may be welded using techniques such as TIG, MIG, and shield metal arc welding. For edge preparation, mechanical cutting is desirable. Wide U- and V-groove angles should be used. Care should be taken to ensure its welding portion is clean as NAS 600 is sensitive to surface contamination.
Heat Treatment The following heat treatment may be used:
・Annealing: 800~1150℃; Air or water cooling
Care should be taken at temperatures exceeding 1050℃ as there is a strong tendency for the crystal grains to become coarse.
Machinability As a high-nickel alloy, NAS 600 is not as machinable as an austenitic stainless steel. A high-speed steel cutting tool may be used, though a sintered carbide tool is recommended. Also, the feed speed should be somewhat reduced, aiming for deep cutting. The recommended lathe feed speeds are as follows:
・High-speed steel tool: 1050~1350mm/min
・Sintered carbide tool: 3000~5250mm/min
After machine work, lubricants should be completely removed before welding or heat treating.
Properties at High Temperatures Exhibiting particularly superior oxidation resistance at high temperatures, NAS 600 can be used in air as well as other environments continuously for long periods of time. Because it has excellent resistance to nitrogen, hydrogen and carburization, NAS 600 can be used in heat treatment furnaces. Care is needed with wet chlorine and bromide, however, as they will cause damage.
・Long-term continuous use in air oxidizing environment: 1100℃
・Reducing environment of H2 or CO not containing sulfur: 1150℃
・Oxidizing sulfur environment (in air containing sulfurous acid): 815℃
・Reducing environment containing hydrogen sulfide: 535℃
・Hydrogen chloride: 540℃
・Chlorine gas: 510℃
Applications Nuclear power plants, heat exchangers, industrial chemical evaporators, industrial acid and alkali equipments, heat treatment furnace parts, afterburner parts and other components used at high temperatures.