DC53D+Z(St05Z) Hot Dip Galvanized Automotive Steel

 

DC53D+Z(St04Z) hot dip galvanized plates(coils) are featured with strong coating adhesiveness, high erosion-resistance, accurately controlled zinc coating thickness, high size precision, flat profile and good mechanical, processing and welding performance. They can be used for making outside and inside automotive plates, structural parts and reinforcements.

 

Hot-dip galvanizing is the process of applying a protective zinc coating to a steel sheet or iron sheet, to prevent rusting.
Excellent anti-corrosion, paintability, and processability due to the self-sacrificing characteristic of zinc.
Available to select and produce the desired amount of zinc gilded and in particular enables thick zinc layers(maximum 120g/m2).
Classified as either zero spangle or extra smooth depending on whether the sheet undergoes skin pass treatment.

 

 

 

• DC53D+Z(St05Z) hot dip galvanized automotive steel size:

Nominal thickness: 0.30mm~3.0mm, nominal width: 800mm~1830mm
Note: nominal thickness of a plate/strip is sum of base plate thickness and coating thickness.

 

• DC53D+Z(St05Z) hot dip galvanized automotive steel mechanical performances and coating adhesiveness:

 

Steel grade	Mechanical performances						Coating adhesiveness
	Yield strength MPa	Tensile strength MPa	n90 ≥	r=90 ≥	After breakage percent elongation % ≥		Bending center diameter in following coating weight(g/m²)c (a=plate thickness)
					L0=80mm, b=20mm		≤140/140	>140/140~175/175	>175/175
					Under following nominal thickness mm
					≤0.7	>0.7
DC53D+Z(St05Z)	140~260	270~380	-	-	28	30	0a	1a	2a

Allowable reduction of min.r90 specified is by 0.2 in case of product thickness>1.5mm.

Allowable reduction of min.r90 and n90 specified are respectively by 0.2 and 0.01 in case of product thickness<0.7mm.

For differential coated products, the thicker coating is used as outside surface in bending test.

 

• DC53D+Z(St05Z) hot dip galvanized automotive steel coating weight range:

 

Coating form	Applicable surface structure	Weight range of following coatings a g/m²(A/B)
		Zinc coating	Zn-Fe alloy coating
Equally coating	Z, X, G, GX, N, R	40/40~225/225	30/30~90/90
Differential coating b	N, R	30~150(each side)	-
a. 50 g/m² coating weight is equivalent to about 7.1 µm. b. max. differential coating thickness ration is 1:3.

 

• DC53D+Z(St05Z) hot dip galvanized automotive steel surface treatment:

 

1 Chromate treatment (L)	Chromate treatment is a treatment with an aim to prevent white rusts formed on product surfaces during transportation and storage.
2 Oiling (Y)	Oiling is to prevent white rusts formed on product surfaces during transportation and storage.
3 Chromate treatment + oiling (LY)	This treatment with oiling after surface chromate treatment is to further avoid the forming of white rusts.

 

 

 

 

 

 

 

 

 

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