Heat Resistant Alloys

NAS 601

  • JISNCF 601
  • UNSN06601
  • DIN/EN2.4851
, comparable to Inconel® 601 Alloy

NAS 601 (NCF 601, UNS N06601) is a nickel-chromium alloy with an addition of aluminum that provides high mechanical properties at elevated temperatures, and superior resistance to oxidation, carburization and sulfurization. It excels particularly in descaling resistance in cyclic oxidation applications with a high temperature variation, and is therefore used in various parts for heat treatment furnaces, diesel vehicle glow plugs, and the like. Nippon Yakin supplies this product in plate, sheet, and strip forms.

* Inconel is a registered trademark of Special Metals Corporation.
Chemical Composition 60Ni-23Cr-1Al-0.2Ti
Product shape
Workability Hot working is relatively easy with NAS 601. For hot working, temperature should be between 1050 and 1200℃, although light work may be done at temperature as low as 850℃. The temperature range between 650 and 850℃ should be avoided as cracking may occur. After hot working, we also recommend cooling through the temperature range of 500 to 800℃ as fast as possible to avoid carbide precipitation. NAS 601 has superior cold workability, similar to Type 310S and Alloy 800.
Weldability As with standard austenitic stainless steels, NAS 601 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 601 is sensitive to surface contamination.
Heat Treatment After cold working, softening occurs at around 900℃. If high temperature strength is required, we recommend solution treatment at 1100 to 1200℃. Cooling is done with water, through air cooling may be used as well for thinner material. We recommend cooling though the temperature range of 500 to 800℃ as fast as possible to avoid carbide precipitation.
Machinability As a high-nickel alloy, NAS 601 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.
Applications Muffle furnaces, baskets and other furnace parts, industrial heat treatment furnace parts, special glass melting furnace parts, automobile glow plug parts, automobile exhaust gas sensor covers.