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.

As a high-nickel alloy, Alloy 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.

• 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℃