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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.