What’s HCT780C+ZM steel ?

ASK:

What’s HCT780C+ZM steel ?

ANSWER:HCT780C+ZM is a hot dip Zinc-magnesium coated steel grade in European standard EN10346 ,HCT780C+ZM 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+ZM is 1.0954+ZM.

+ZM means Hot-dip Zinc-magnesium alloy coated, application of a Zinc-magnesium coating by immersing the prepared strip in a molten bath of zinc-aluminum-magnesium. The composition of the bath is sum of aluminium and magnesium from 1.5%-8%, containing minimum of 0.2% magnesium and the balance zinc. So HCT780C+ZM means hot dip zinc-magnesium coated, complex-phase quality steel material for cold forming .

HCT780C+ZM material steel have coil, strip, sheet condition, thickness is from 0.2mm-3mm.

HCT780C+ZM steel coating finish is N(Normal spangle) or M(Minimized spangle)

HCT780C+ZM steel Surface quality A (As coated surface) , B(Improved surface), C(Best quality surface)

HCT780C+ZM steel Surface treatment C (chemically passivated) , O (oiled), CO (chemically passivated and oiled) , P (phosphate) , PO (phosphate and oiled), S (sealed)

HCT780C+ZM steel Coating mass are:
ZM060,ZM070,ZM080,ZM090,ZM100,ZM120,ZM130,ZM140,ZM150,ZM160,ZM175,ZM190,ZM200,ZM250,ZM300,ZM310,ZM350,ZM430,

HCT780C+ZM 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.