Chemistry composition:Gu:0.20 Mg:0.05 Mn:1.0-1.6 Fe:0.7 Si:0.6 Zn:0.1 Standards:3*4.50.2,6*6,3*10,3*6,3*8,3.8*6,4.7*6,2*5,2.5*4.5......