Introduction of Galvanizing Process


Galvanising is the most effective and economical method of protecting steel against rusting. The protection mechanisms of zinc coating are twofold, as follows:

Zinc forms a protective film of stable basic carbonate when exposed to air which prevents further reaction of air with surface.

Zinc undergoes galvanic action in which the zinc sacrifices itself to protect the steel, due to formation of a galvanic cell. Surface of Iron is covered with a layer of more active metal like zinc. This active metal loses electrons in preference to Iron & hence, prevents the rusting of Iron. However, the covering metal gets consumed in due course of time, but, so long as it is present, even the nearly uncoated or uncovered surface of Iron does not get rusted. In this way even scratches, some discontinuities or bare spots in the protective layer of zinc are also protected by surrounding coating of zinc. This type of protection is called sacrificial protection. Generally, speaking, the heavier the zinc coating the better is the corrosion resistance.

Galvanized steel sheets is used in construction industry, appliance industry and in a variety of applications including in furniture, automotive applications and storage related applications.

Product Specifications & Tolerances

Product Specifications & Tolerances Grades
JIS G 3302 SGCC-RCX, SGCH-RCX, SGCD-1-RCX, SGCD-2, SGCD-3, SGCD4. SGC340, SGC400, CGC440, SGC490, SGC570
*ASTM A 653/ A653 M CS A, CS B, CS C, FS A, FS B, DDS A, DDS C, EDDS, SS 33, SS 37, SS 40, SS 50, Class1, 2, 3, 4, SS 55, SS 80 – Class 1, 2 & 3
*DIN EN 10346 DX51D, DX52D, DX53D, DX54D,DX55D,DX56D,DX57D, S220GD, S250GD, S280GD, S320GD, S350GD, S390GD, S550GD
AS1397 G1,G2,G3,G250,G300,G350,G550

*Tolerance as per ASTM A924 & DINEN10143