I would like to know what does the "D" means in steel grade 16MND5.
According to the standard EN 10027:
16 means 0.16 % C MN 5 means 1.25 % Mn (5 must be divided by 4 to get the Mn mass fraction)
But nothing is specified for D.
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Having looked at the link,
D is for Flat products for cold forming, and is usually followed by two numbers characterising steel