Cyclic oxidation properties for NAS601 are superior to Type 310S and Alloy 800H. This makes NAS601 optimal for use in environments subjected to repeated heating and cooling.

Workability

Hot working is relatively easy with NAS601. For hot working, temperatures should be between 1050 and 1200°C, although light work may be done at temperatures as low as 850°C. The temperature range between 650 and 850°C should be avoided as cracking may occur. After hot working, we also recommend cooling through the temperature range of 500 to 800°C as fast as possible to avoid carbide precipitation. NAS601 has superior cold workability, similar to Type 310S and Alloy 800.

Weldability

As with standard austenitic stainless steels, NAS601 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 NAS601 is sensitive to surface contamination. AWS ERNiCrFe-11, AWS ERNiCrCoMo-1, AWS ENiCrFe-2, or AWS ENiCrCoMo-1 are commonly used.

Heat Treatment

NAS601 is non-hardenable by thermal treatment. Typical heat treatments are as follows:

• Annealing: 950°C minimum, rapid cooling.
• Solution treatment: 1100°C–1200°C, rapid cooling.
  For applications requiring high strength at elevated temperatures, solution treatment is recommended.

Applications

• Heat treatment fixtures
• Muffe furnace
• Radiant tube
• Chemical plants
• Automobile glow plug