St 37 or St 52

[iseb]

Hi everybody.
I am intending to install an elevator in my house and I have two offers, which suggest different pistons (among others).
First offer: piston shell thickness=12mm, material st37.
Second offer: piston shell thickness=5mm, material st52.
Are equivalent or which is better and how can I calculate that? Thank you in advance.

 

[Goahead]

Please note that the materials indicated do not belong to this forum.

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