What material is good for frozen saline at -20°C?
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For stirring equipment equipped with a jacket filled with frozen brine, what material is suitable – carbon steel or stainless steel?
Both types of steel corrode; to save money, use carbon steel.
For frozen brine, I’ve seen carbon steel being used – 20 degrees is right at the threshold for low-temperature steel; in that case, 304 stainless steel could work as a compromise (offering both corrosion resistance and the properties of low-temperature steel). However, since frozen brine mainly contains chlorides, using stainless steel isn’t quite appropriate.
Inorganic frozen saline or organic frozen saline? !
Use TA2; it’s just more expensive. But if you place the frozen saline in a jacket, it will likely be necessary to use pure titanium, which makes the cost even higher. However, TA2 should not corrode under your operating conditions.
According to the specifications, carbon steel (low-temperature steel) will suffice.
According to the specifications, carbon steel (low-temperature steel) will suffice.
It is recommended to use normalized Q345R (formerly 16MnR)! Take temperature and Cl ion content into consideration when using it!