I have a question: Will a 20G tube crack due to freezing at -40°C?
Thread Content
How to make a comparison? Is it by comparing the coefficient of thermal expansion of water with that of steel?
It’s best to go by the actual conditions. If you’re not in the design field, there’s no need to be too strict about this. Frost prevention and insulation measures must be handled carefully; it’s better to assume they exist rather than assuming they don’t.
It will not crack from freezing, but its impact strength will decrease
It can’t be used anymore, right? The 20mm pipe can only be used at temperatures above -20 degrees
We should use 16mnr pipes, right?
When filled with water and with both ends sealed, it will inevitably expand; either it will expand by force or it will crack. An empty tube won’t do this, but for a full tube, if both ends aren’t sealed, it depends on the specific circumstances
-At 40 degrees, a 16Mnr pipe is required
The teacher is trying to mislead you; you should use Q345E. . . Which standard does 16MNR use to issue the material list for you now?