Chemistry composition:Gu:0.20 Mg:0.05 Mn:1.0-1.6 Fe:0.7 Si:0.6 Zn:0.1 Standards:3.8*5,4.7*6,4.7*8,4.7*10,4.7*15,6.5*6,6.5*8,6.5*10,8*10,9.5*6,9.5*8,9.5*10,9.5*12,10*8,10*10,10.3*6,10.3*10,10.3*20,11.2*10,14.2*10......