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ANSWER:HCT780C is a steel grade in European standard EN10346, HCT780C+ZA iscomplex-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 is 1.0954.
+ZA means Hot-dip Zinc-aluminium alloy coated, application of a Zinc-aluminium coating by immersing the prepared strip in a molten bath of zinc-aluminum-aluminium. The composition of the bath is approximately 5% aluminum, small amounts of mischmetal and the balance zinc. So HCT780C+ZA means hot dip Zinc-aluminium coated, complex-phase quality steel material for cold forming.
HCT780C+ZA material steel have coil, strip, sheet condition, thickness is from 0.2mm-3mm.
HCT780C+ZA steel coating finish is N(Normal spangle) or M(Minimized spangle)
HCT780C+ZA steel Surface quality A (As coated surface) , B(Improved surface), C(Best quality surface)
HCT780C+ZA steel Surface treatment C (chemically passivated) , O (oiled), CO (chemically passivated and oiled) , P (phosphate) , PO (phosphate and oiled), S (sealed)
HCT780C+ZA steel Coating mass are: ZA095, ZA130, ZA185, ZA200, ZA255, ZA300
HCT780C+ZA 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.
