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English Translations » 【化工工程交流】 » Why should stainless steel be chosen for urea?

Why should stainless steel be chosen for urea?

2017-12-05View Original

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Why are stainless steel pipes chosen for urea, and what is the corrosion mechanism?
Reply #22017-12-06
Urea plants should use ultra-low carbon stainless steel.
Reply #32017-12-06
Why use ultra-low carbon stainless steel
Reply #42017-12-06
Urea-grade stainless steel must be used; it is also a type of austenitic steel. During the urea production process, intermediate products such as ammonium carbamate are highly corrosive to stainless steel, and grades like 316 and 316L do not meet the requirements for use in this context~~
Reply #52017-12-06
I knew that urea is corrosive.
Reply #62017-12-08
The corrosion of stainless steel by urea is mainly caused by the presence of ammonium carbamate and ammonium hydride in the solution, and it belongs to electrochemical corrosion. The stainless steel used is 316L urea grade, right?
Reply #72017-12-09
Is urea-grade stainless steel specified in those standards?
Reply #82017-12-09
Do ammonium carbamate and ammonium hydride easily escape along with gases?
Reply #92017-12-09
GBT 10476-2004 Technical requirements for urea high-pressure condensers~~Take a look at this standard~~

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Translated at 2026-07-21 04:02:41

Original: https://bbs.hcbbs.com/thread-1876641-1-1.html

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