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ANSWER:DX57D+ZF is a hot dip Zinc-iron coated steel grade in European standard EN10346 ,DX57D+ZF is low carbon steel for super deep drawing quality material, The material No. of DX57D+ZF is 1.0853+ZF.
+ZF means hot dip Zinc-iron coating. The zinc content of the bath is at least 99% . So DX57D+ZF means hot dip zinc-iron coated, low carbon material steel.
DX57D+ZF material steel have coil, strip, sheet condition, thickness is from 0.2mm-3mm.
DX57D+ZF steel coating finish is N(Normal spangle) or M(Minimized spangle)
DX57D+ZF steel Surface quality A (As coated surface) , B(Improved surface), C(Best quality surface)
DX57D+ZF steel Surface treatment C (chemically passivated) , O (oiled), CO (chemically passivated and oiled) , P (phosphate) , PO (phosphate and oiled), S (sealed)
DX57D+ZF steel Coating mass are: ZF100, ZF120
DX57D+ZF steel mechanical property:
Yield strength should be 120-170MPa
Tensile strength should be 260-350MPa
Elongation A80 should be not less than 39%
Plastic strain ratio R90 should be not less than 1.9
Strain hardening exponent N90 should be not less than 0.21