What material is suitable for the pump outlet pipeline of 30% sodium hydroxide?
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Help for experts: What material is suitable for the outlet pipeline of the 30% sodium hydroxide pump? The operating temperature is below 60 degrees Celsius
Agree with the above: Since the concentration of the alkaline solution is not high and the operating temperature is not very high, carbon steel is sufficient to meet the requirements. Of course, it’s better if stainless steel can be used!
Carbon steel can meet the requirements. Any temperature up to 50 degrees can be used. Stainless steel is relatively expensive; PTFE or PTFE-lined pipes can be used, which are cheaper. The original poster can simply take a look at the material corrosion tables in the chemical engineering design manual to choose the appropriate materials. :handshake
30%: when the temperature exceeds 54°C, stress-relief heat treatment of the weld is sufficient. 30%: when the temperature exceeds 97°C, the use of nickel-containing alloys should be considered. In your case, the temperature is only 60°C, so ordinary carbon steel can be treated with heat treatment