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Gilsonite
Fe-Zn Galvannealed Steel Sheet (GA)
PRODUCT INTRODUCTION
Galvannealed steel sheet offers significant improvements in weldability and paintability by undergoing a simple pre-treatment process. After the coating process a special heat treatment forms an alloy layer between the galvanized layer and the metal base.
Superior weldability
The weldability of galvanized sheet is drastically compromised because of the absorption of zinc coating onto the welding electrode. Galvannealed plates have significantly improved weldability because of the high melting point of FeZn alloy on the surface, which prevents electrode contamination.
Greater peeling resistance
Due to exceptional paint adhesiveness resulting from the formation of alloy layers, the peeling resistance during the bending and folding treatment is greatly enhanced, compared to regular hot-dipped sheet.
Superior paint adhesiveness and corrosion resistance
The rough alloy layers of the galvannealed sheet surface facilitates the reaction to the pre-treatment (phosphate and chromate treatment), improving paint adhesiveness and corrosion resistance.
Improvements in powdering
The FeZn alloy layer generally displays a high level of hardness and low ductility, causing the alloy layer on the surface to peel off as powder during deep drawing. Dongbu Steel’s #3CGL uses the high frequency induction heat method during the heat treatment that follows the coating phase, which drastically lowers the degree of powdering, presenting an elegant steel surface.
CROSS SECTION
PRODUCTION AVAILABILITY
Strip Thickness 0.30 ~ 2.0mm
Strip Width 600 ~ 1600mm
Coating Mass GI : 60 ~ 720g/m², GA : 60 ~ 180g/m², SGL : 60 ~ 250g/m²
Coil I.D 508mm and 610mm
Coil O.D 2200mm max
Coil Mass 25 tons max
Steel Grade CQ, LFQ, DQ, DDQ, EDDQ, SQ
Main Products GI Zero Spangle
Galvannealed
SuperGalum
Specifications
Designation Type KS D 3506 JIS G 3302 ASTM EN
cold-rolled
base metal used
hot-rolled
base metal used
cold-rolled
base metal used
hot-rolled
base metal used
OLD A653-97
Commercial Quality SGCC SGHC SGCC SGHC A 526 CS Type A & B EN 10142
Lock Forming Quality - - - - A 527 CS Type C  
Commercial Soft Quality SGCC-L - SGCC-L - A 526-L FS Type A & B EN 10142
Commercial Hard Quality SGCH - SGCH - - - -
Drawing Quality SGCD1
SGCD2
SGCD3
- SGCD1
SGCD2
SGCD3
- A 528 DDS
EDDS
EN 10142
Structural Quality SGC340
SGC400
SGC440
SGC490
SGC570
SGH340
SGH400
SGH440
SGH490
SGH540
SGC340
SGC400
SGC440
SGC490
SGC570
SGH340
SGH400
SGH440
SGH490
SGH540
A446 Grade 230
Grade 255
Grade 275
Grade 340 class 1 ,2 ,3
Grade 550
EN 10147
Surface Finish
Type Surface Finish
Alloy coated iron-zinc Galvannealed steel sheet has a highly workable iron-zinc alloy layer. Excellent paint-adherence properties, corrosion resistance and weldability make it ideal for use in home electrical appliances and buildings.
Surface Treatment
Type Application
Chromate General
Non-treated General painting
Organic Drawing
Oiling
Oiling Type Not Oiled Oiled
Surface Finish and Applications
Classification Weight of zinc coating Surface Finish Quality Application
Galvannealed Finish F04 ~ F18 Commercial Quality
Drawing Quality
Structural Quality
Home electrical appliances (Washer, Microwave oven) Building materials, automobile parts, various fuel tanks
Post Treatment
A variety of post treatments are available depending on the use of products.
Oiling : Automobiles
Chromate : Home electrical appliances, painting
Organic Coating : Surface coating, improving corrosion resistance, painting, and lubrication
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