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ANSWER:HCT780C+ZF is a hot dip Zinc-iron coated steel grade in European standard EN10346 ,HCT780C+ZF is complex-phase quality steel material for cold forming (the steel with a multiphase microstructure containning mainly bainite, ferrite, whereas martensite, tempered martensite, retained austenite and pearlite may be present as additonal phases), The material No. of HCT780C+ZF is 1.0954+ZF.
+ZF means hot dip Zinc-iron coating. The zinc content of the bath is at least 99%, or the annealing produces and iron-zinc coating with an iron content of normally 8%-12%. So HCT780C+ZF means hot dip zinc-iron coated,complex-phase quality steel material for cold forming .
HCT780C+ZF material steel have coil, strip, sheet condition, thickness is from 0.2mm-3mm.
HCT780C+ZF steel coating finish is N(Normal spangle) or M(Minimized spangle)
HCT780C+ZF steel Surface quality A (As coated surface) , B(Improved surface), C(Best quality surface)
HCT780C+ZF steel Surface treatment C (chemically passivated) , O (oiled), CO (chemically passivated and oiled) , P (phosphate) , PO (phosphate and oiled), S (sealed)
HCT780C+ZF steel Coating mass are: ZF100, ZF120
HCT780C+ZF steel mechanical property:
Yield strength should be 570-720MPa
Tensile strength should be not less than 780MPa
Elongation A80 should be not less than 10%
Bake hardening index BH2 should be mot than than 30MPa.