Can Hastelloy B3 withstand 0.2% HNO3?
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Can Hastelloy B3 (the pumps we use now are cast; the more accurate grade is N12MW) withstand 0.2% HNO3? In practice, the cast Hastelloy N12MW pump is used to transport 5-10% HCl at a flow rate of 25 m3/h and a head of 350 m, supplying it to the filter downstream. The filter needs to be cleaned after running for a certain period of time. First, rinse with clean water, then clean with an alkaline solution, rinse again with clean water, and finally clean with 0.2% HNO3. Rinse thoroughly with clean water, then continue to feed in hydrochloric acid. I’m not sure whether 0.2% HNO3 will corrode the pump body during this process The temperature is always between 20-40°C.
I usually transport 5-10% hydrochloric acid. 304 can’t take it.
Is your question not whether Hastelloy B3 can withstand 0.2% HNO3?
Yes, indeed. I’m just worried about whether it can be tolerated You said “304 is fine,” and I know as well that 304 can withstand 0.2% HNO3 without any problem. But I don’t know if pumps made from Hastelloy N12MW castings can withstand 0.2% HNO3 Can you understand?
Mistake in selection – Hastelloy B, a nickel-molybdenum alloy; it should be avoided for use in nitric acid media. But such a low concentration should be fine
Thank you to the original poster for sharing so selflessly! ! ! ! ! !