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          Galvanized Steel (GI)

      

    Ⅰ Product:

    It is the equipment that applies zinc plating by dipping a sheet of hot-rolled steel into a molten zinc pot so as to be coated with zinc deposits.

     

    Surface

    1. Status: Different coating processing with different status, such as normal zinc spangle, fine spangle, formation spangle, zero spangle and phosphating  treatment surface etc.  Germany standard also need be provided surface level.

    2. Galvanized sheets should have good appearance, no harmful defects, such as no plates, holes, broken and scum, over coating thickness, scratch, chromic acid dirt and white rust, etc.  Foreign standards no any clear and definite for the appearance defects. So these defects details should be stated on the contract when you order it.

     

    Ⅱ Coating weight

    Coating weight means for the zinc layer thickness, unit is g/m2. Japan, USA and Germany standard for the galvanized sheet coating weight as below:

     

        Coating weight(unit:g/m2):

        JISG3302 :          Z12 Z18 Z22 Z25 Z27 Z35 Z43 Z50 Z60 Z70

       Zinc coating weight :120 180 220 250 270 350 430 500 600 700

        ASTMA525:           A40 A60 G60 G90 G115 G140 G165 G185 G210 G235

      Zinc coating weight : 122 183 183 275 351 427 503 564 640 700

     

    Ⅲ Technical properties

    (1)Tensile test  

    (2)Bending test

     

    Ⅳ Chemical composition

    Demand for the chemical composition of base galvanized sheet, different counties with different rulers. GB standard is usually detect contents of carbon, manganese, phosphorus, sulfur, silicon.

     

     

    Ⅴ Standard

    JIS G3302—94 SGCC

    JIS G3312—94 CGCC

    JIS G3313—90(96)Electrolytic zinc-coated steel sheets and coils

    ASTM A526—90 Standard Specification for Steel Sheet, Zinc-Coated 

    (Galvanized) by the Hot-Dip Process, Commercial Quality

    ASTMA 527—90(75)Specification for Steel Sheet, Zinc-Coated (Galvanized) by the Hot-Dip 

    Process, Lock-Forming Quality

    ASTMA528—90  Specification for Steel Sheet, Zinc-Coated (Galvanized) by the Hot-Dip Process 

    Drawing Quality 

    ASTMA444—89 Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) by the Hot-

    Dip Process for Storm Sewer and Drainage Pipe 

    ASTM A446—9 3 Specification for Steel Sheet, Zinc-Coated (Galvanized) by the Hot-Dip 

    Process, Structural (Physical) Quality

    ASTMA599—92 Specification for Steel Sheet, Cold-Rolled, Tin-Coated by 

    Electrodeposition

    ASTMA642—90 Specification for Steel Sheet, Zinc-Coated (Galvanized) by the Hot Dip Process, 

    Drawing Quality, Special Killed 

    ΓOCT7118—78

    DINEN10142-91 part 1

    DINEN1012-92 part 2

     

     

    Ⅵ Testing standard

    JIS H0401—83 Test methods for hot dip galvanized coatings

    DIN50952— 69 Test methods for hot dip galvanized coatings

     

    Ⅶ  Hot-dip galvanized sheets(coils) surface treatment

    L--Chromating

    Y--Oiling

    LY--Chromating-oiling

    GZ--Skin passed

     

    The surface structure, characteristics and Application:

    Regular spangle(Z)——under normal conditions after galvanized zinc layer condensing spangle—general purpose

    Skin passed spangle (GZ)——Through skin-pass mill to finishing the surface—mainly using for the base color plate.