May be this will help to some extent:
EN10025-2 allows the delivery conditions +M, +N or +AR at the manufacturers discretion.
FYI: None of these delivery conditions has any impact on the mechanical properties / chemical composition as defined in EN10025-2.
Delivery condition +MGAL is not defined in EN10025, it might be an internal manufacturer's code, e.g. +M, capable of forming a zinc layer during hot-dip galvanization.
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