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Metallurgy/St 52 NBK

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Question
I have read a material name St 52 NBK. I want to know about its properties & any equivalent to it? What stands here for NBK?

Thanks & Regards,
Harshit Rajput
India

Answer
The NBK following the grade name indicates that the steel is furnished in the normalized condition (annealing above the upper transformation temperature, i.e. above the A3 line in the Fe-C phase diagram, in a controlled atmosphere).

The properties must be checked from the applicable standard. Nevertheless, the room temperature mechanical properties are roughly as follows (according to DIN EN 10305-1):

YS => 355 MPa
UTS = 490-630 MPa
Total elongation => 22%

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