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易切削結構鋼                                                    

中國                                                                   標準   前蘇聯    德國       美國       日本       英國       法國      

GB                                                                      ISO    TOCT     DIN UNS       AISI       JIS  BS   NF  

Y12                                                                     Ios20  A12 Ios20      G12120   1212       Sum12    210m15   13mf4    

Y12pb                                                                 Iosb20            Iospb20   G12134   12L13     Sum221            

Y15                                                                     15S20      15S20     G12130   1213       Sum22    220m07   S250      

Y15pb                                                                 Iismnpb28  Ac14       9smnpb28      G12144   12L14     Sum24L       S250pb                                                                         

Y20                                                                     22S20 A20 22s20      G11200   1120       Sum32         18mf5    

Y30                                                                     A30      G11320   1132                       

Y35                                                                     35S20 A35 35S20     G11370   1137            21M3b    35mf6    

Y40mn                                                                44smn28    A40T           G11440   1144       Sum42    225m44   45mf6