I think you can look these standards:
Country Standard Grade
Italy D.M. 09/01/96 FEB44 K
D.M. 23/09/05 B450C
France NFA 35-016 FeE 500-3
Germany DIN 488 Bst 500 WRS
Spain UNE 36065 B 500 SD
Switzerland SIA 262 B450C - B500B
United Kingdom BS 4449 GR. 460 B
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