Weldability
Like standard austenitic stainless steel, NAS600 can be welded by TIG, MIG and shielded metal arc welding. For edge treatment, it is best to use mechanical cutting. Wide U-shaped and V-shaped groove angles should be used. Care should be taken to ensure that the welded parts are clean, as NAS 600s are sensitive to surface contamination.
Heat treatment
The following heat treatment methods can be used. Annealing: 800 ℃ to 1150 ℃; air or water cooling. Attention should be paid when the temperature exceeds 1050 ℃, because the grains can easily become coarse.
Machinability
As a high nickel alloy, NAS600 is not as machinable as austenitic stainless steel. High-speed steel cutting tools can be used, but sintered cemented carbide tools are recommended. In addition, the feed speed should be reduced to achieve the purpose of deep cutting. The recommended lathe feed speed is as follows.
High-speed steel tools: 1050~1350mm/min.
Sintered cemented carbide tools: 3000~5250mm/min.
After machining, the lubricant should be completely removed before welding or heat treatment.
Characteristics at high temperature
Exhibiting excellent oxidation resistance at high temperatures, NAS 600 can be used continuously in air and other environments for a long time. Because of its good resistance to nitrogen, hydrogen and Carburizing, NAS 600 can be used in heat treatment furnaces. However, care needs to be taken with wet chlorine and bromide, as they can cause damage. The maximum temperatures that can be used in different environments for NAS 600s are as follows.
●It can be used continuously for a long time in air oxidation environment: 1100 ℃.
●Reduction environment of sulfur-free H2 or CO: 1150 ℃.
●Oxidizing sulfur environment (in air containing sulfite): 815 ℃.
●Reductive environment containing hydrogen sulfide: 535 ℃.
●Hydrogen chloride: 540 ℃.
●Chlorine: 510 ℃
Application
Nuclear power plants, heat exchangers, industrial chemical evaporators, industrial acid and alkali equipment, heat treatment furnace components, post-burner components and other components used at high temperatures.
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