Manufacturer: Nippon Yakin Kogyo Co., Ltd
Model : NAS600

NAS600 (UNS N06600)
Heat-Resistant Nickel Alloy

NAS600 (NCF600, UNS N06600) is a nickel-chromium alloy that provides excellent resistance to oxidation at high temperatures. Nippon Yakin supplies this product in plate, sheet, and strip forms.

Chemical Composition	77Ni-16Cr-6Fe
Product Shape	Coil	Sheet	Plate
Workability	Hot working is relatively easy with NASH600. For hot working, the temperature should be between 1000°C and 1150°C, although light work may be done at 850°C. Cold workability is easier than austenitic stainless steels, similar to Monel.
Weldability	As with standard austenitic stainless steels, NASH600 may be welded using techniques such as TIG, MIG, and shield metal arc welding. For edge preparation, mechanical cutting is advisable.
Heat Treatment	The following heat treatments may be used:
	– Annealing: 800–150°C; Air or water cooling.
Machinability	As a high nickel alloy, NASH600 is not as machinable as an austenitic stainless steel. We may use a high-speed cutting tool, though we recommend a sintered carbide tool. The recommended feed speeds are as follows: – High-speed steel tool: 100–135m/min – Sintered carbide tool: 300–250m/min. You should completely remove lubricants after machining before welding or heat treating.
Properties at High Temperatures	Engineers rely on NASH600 for its particularly superior oxidation resistance at high temperatures, which allows them to use it continuously in air and other environments for extended periods. Additionally, due to its excellent resistance to nitrogen, hydrogen, and carburization, engineers frequently use NASH600 in heat treatment furnaces. However, caution is necessary when dealing with chlorine and bromide, as these substances can cause damage. – Long-term continuous use in air oxidizing environment: 1100°C – Reducing environment of H2 or CO not containing sulfur: 1150°C – Excluding sulfur environment (in air containing sulfuric acid): 815°C – Reducing environment containing hydrogen sulfide: 535°C
Applications	Heat treatment fixtures, Muffle furnace, Chemical plants.

Mechanical Properties

Mechanical Properties at Room Temperature

High Temperature Strength

Workability

Hot working is relatively easy with NAS600. Operators should maintain temperatures between 1000 and 1180°C for hot working, although they can perform light work at temperatures as low as 850°C. However, they should avoid the range between 650 and 850°C, as cracking may occur. Cold workability is easier than austenitic stainless steels, similar to Monel.

Weldability

You can weld NAS600 using techniques such as TIG, MIG, and shielded metal arc welding, just like with standard austenitic stainless steels. For edge preparation, it is desirable to use mechanical cutting. Additionally, operators should use wide U- and V-groove angles.Care should be taken to ensure its welding portion is clean as NAS600 is sensitive to surface contamination.

Heat Treatment

You may use the following heat treatment:

• Annealing: 800-1150°C; Air or water cooling.
  Care should be taken at temperatures exceeding 1050°C as there is a strong tendency for the crystal grains to become coarse.

Machinability

As a high-nickel alloy, NAS600 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, NAS600 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, NAS600 can be used in heat treatment furnaces. Care is needed with wet chlorine and bromide, however, as they will cause damage.

The maximum temperatures that NAS600 may be used in different environments are as follows:

• Long-term continuous use in air oxidizing environment: 1100°C
• Reducing environment of H₂ or CO not containing sulfur: 1150°C
• Oxidizing sulfur environment (in air containing sulfurous acid): 815°C
• Reducing environment containing hydrogen sulfide: 535°C
• Hydrogen chloride: 540°C
• Chlorine gas: 510°C

Applications

• Heat treatment fixtures
• Muffe furnace
• Chemical plants