NH₃ Medium Material Selection Tips:

1. Room temperature and anhydrous NH₃ liquid, i.e., pure NH₃ (NH₃ temperature < 150℃): Carbon steel is recommended;

2. Room temperature and hydrated NH₃ liquid (NH₃ temperature < 200℃): Stainless steel 316 is recommended;

3. Room temperature and hydrated NH₃ gas (NH₃ temperature < 200℃): Stainless steel 316 is recommended;

4. Dry NH₃ without moisture and oxygen (NH₃ temperature in the 200-300℃ range): Alloy steel F11 is recommended;

5. Dry NH₃ without moisture and oxygen (NH₃ temperature in the 300-450℃ range): Alloy steel F22 is recommended;

6. Dry NH₃ (NH₃ temperature greater than 450℃): Inconel 625 is recommended;

6. 7. Dry NH₃ containing impurities: Inconel 625 is recommended;

8. Wet NH₃ (NH₃ temperature between 200-450℃): Inconel 625 is recommended;

9. Wet NH₃ (NH₃ temperature greater than 450℃): Ceramic-lined valves are recommended.

Note: Copper, brass, and copper alloys are strictly prohibited for use with NH₃ medium, as they will cause rapid ammonia-induced stress corrosion cracking.