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, and 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 | |
| DC53D+Z (St05Z), DC53D+ZF | Deep drawing | Ultra-low carbon steel |
| DC54D+Z (St06Z), DC54D+ZF | Extra deep drawing | |
| DD54D+Z (St06ZR) | ||
| DC56D+Z (St07Z), DC56D+ZF | Supreme extra deep drawing |
2. Available sizes: 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 % | |||
| 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 |
| 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) | |
| 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 | ||
| 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 |
