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Hot-dip Zinc Coated Steel Sheet

hot dip zinc coated steel sheet

Hot-dip Zinc Coated Steel Sheet of Baosteel 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. Category of Hot-dip galvanized products:commercial purpose,drawing,deep drawing,extra deep drawing,supreme extra deep drawing,structure,cold forming.
The products of these lines are widely used in electrical household appliance, architecture, transportation, furniture, auto parts etc.
1. Applications and features are given as following table

Steel Grade	Application	Feature
DC51D+Z (St01Z, St02Z, St03Z) , DC51D+ZF	Commercial purpose	Low carbon and/or ultra-low carbon steel
DC52D+Z (St04Z), DC52D+ZF	Drawing	Low carbon and/or ultra-low carbon steel
DC53D+Z (St05Z), DC53D+ZF	Deep drawing	Ultra-low carbon steel
DC54D+Z (St06Z), DC54D+ZF	Extra deep drawing
DD54D+Z (St06ZR)	Extra deep drawing
DC56D+Z (St07Z), DC56D+ZF	Supreme extra deep drawing

2. Available 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. 　
3. Chemical Composition % :

bse metal type	Grade	CHEMICAL COMPOSITION %
bse metal type	Grade	C	Si	Mn	P
cold rolled steel sheet	DC51D+Z (St01Z, St02Z, St03Z) , DC51D+ZF	≤0.10	-	≤0.50	≤0.035
	DC52D+Z (St04Z), DC52D+ZF	≤0.08	-	≤0.45	≤0.030
	DC53D+Z (St05Z), DC53D+ZF	≤0.08	-	≤0.40	≤0.030
	DC54D+Z (St06Z), DC54D+ZF	≤0.01	≤0.10	≤0.30	≤0.025
	DC56D+Z (St07Z), DC56D+ZF	≤0.01	≤0.10	≤0.30	≤0.025
hot rolled steel sheet	DD51D+Z (St01ZR, St02ZR)	≤0.10	-	≤0.50	≤0.035
hot rolled steel sheet	DD54D+Z (St06ZR)	≤0.01	≤0.10	≤0.30	≤0.025

4. Mechanical performances and coating adhesiveness

Grade	Mechanical performances				Coating Adhesiveness
	Yield Strength MP	Tensile Strength MP ≥	After Breakage Percent Elongation (LO=80mm,b=20mm)% ≥		Bending Center Diameter in Following Coating Weight (g/m2)c (a=plate thickness)
			L0=80mm,b=20mm
			Under following nominal thickness mm		≤140/140	>140/140~175/175	>175/175
			≤0.7	>0.7
DC51D+Z (St01Z, St02Z, St03Z) , DC51D+ZF	-	270~500	20	22	0a	1a	2a
DC52D+Z (St04Z), DC52D+ZF	140~300	270~420	24	26
DC53D+Z (St05Z), DC53D+ZF	140~260	270~380	28	30
DC54D+Z (St06Z)	140~220	270~350	34	36
DC54D+ZF			32	34
DC56D+Z (St07Z)	120~180	270~350	38	40
DC56D+ZF			36	38

5. Coating weight range

coating form	Applicable Surface Structure	Weight Range of Following Coatings a g/m2 (A/B)
coating form	Applicable Surface Structure	Zinc Coating	Zn-Fe Alloy Coati
equally coating	Z,X,G,GX,N,R	40/40~225/225	30/30~90/90
differential coating	N,R	30~150 (each side)	-
a. 50 g/m2coating weight is equivalent to about 7.1μm. b. max. differential coating thickness ratio is 1:3.

6. Surface structure

Surface structure	Code No.	Features	Application
Conventional spangle	Z	Spangles condensated on zinc coating under normal conditions after galvanizing.	Commercial purposes
Small spangle	X	Surface in spangles smaller than conventional ones and due to controlled condensation of zinc coating.	Applications where conventional spangles cannot meet the surface appearance requirements.
Skin passed spangle	G	Surface structure after special skin pass treatment.	Applications of high surface quality requirements, such as color coating base plates.
Skin passed small spangle	GX	Surface structure after special skin pass treatment.
Zero spangle	N	No visible spangles on coating surface as a result of a special production process.	-
Zn-Fe alloy	R	No spangle, gray, normally matte	Applicable to further painting

7. Surface treatment

1 Chromate treatment (L)	Chromate treatment is a chemical 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)	3 Chromate treatment+ Oiling (LY) This treatment with oiling after surface chromate treatment is to further avoid the forming of white rusts.

8. Surface quality

Code No.	Features
FB (O3)	t is allowed for the existence of small erosion spots, dark spots, strip marks, minor chromate treatment defects and small zinc particles.
FC (O4)	No erosion spot is allowed. However, it is allowed for the existence of light impression, scratches, zinc flow ripple marks, minor chromate treatment defects in small range, while the other side must reach FB requirements at least.
FD (O5)	One side of relatively good quality must further restrict on defects, namely appearance quality after painting is not affected, and the other side must reach FB requirements at least.

9. Steel grade reference list of the standards, the cited standards and other standards

Q/BQB 420-2003	EN10142:2000 EN10147:2000 EN10292:2000	EN 10142:1990 EN 10147:1991	JISG3302-1994	ASTMA653M-2002
DC51D+Z (St01Z, St02Z, St03Z) , DC51D+ZF	DC51D+Z, +ZF	FeP02GZ, ZF	SGCC	CS type C
DC52D+Z (St04Z), DC52D+ZF	DC52D+Z, +ZF	FeP03GZ, ZF	SGCC	CS type A, type B
DC53D+Z (St05Z), DC53D+ZF	DC53D+Z, +ZF	FeP05GZ, ZF	SGCD1	FS type A, type B
DC54D+Z (St06Z), DC54D+ZF	DC54D+Z, +ZF	FeP06GZ, ZF	SGCD2	DDS
DC56D+Z (St07Z), DC56D+ZF	DC56D+Z, +ZF	DX56D+Z, +ZF (SEW 021)	SGCD3	EDDS

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