UNI EN 10263-3:2003
 
Material Group, chemical composition
Chemical composition
Steel name                                                             (in mass %)
Symbol Number C Si Mn P S Cr B Cu
  max max max max
15B2 1.5501 0.13/0.16 00:30 0.60/0.80 0.025 0.025    0.0008/0.005 00:25
17B2 1,5502 0.15/0.20 00:30 0.60/0.90 0.025 0.025  0.30 max 0.0008/0.005 00:25
18B2 1.5503 0.16/0.20 00:30 0.60/0.80 0.025 0.025    0.0008/0.005 00:25