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Unknown steel

KristjanGerhard

Mechanical
Apr 16, 2015
6
Hi everyone,

Posting in the materials engineering section, let me know if this would be better placed somewhere else.

I am looking to identify steel used in a hydroelectric powerplant penstock and trifurcation. The plant is built in 1969 with the primary consultant being from the US.

According to drawings the penstock is made of "OX 520 G"
According to drawings the trifurcation is made of "Fb 50"

Is anyone familiar with these steel designations.
 
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