GAVANIZED STEEL

Royal Steel Galvanized Steel Sheet (GI) is produced by our continuous galvanized line (CGL) which allows to form natural zinc spangle, creates smooth and soft-feel of surface but still ensures high resistance on corrosion and extreme weather conditions.

Based on many researches on durability, RSC Galvanized Sheet (GI) is suitable for customers who are seeking for quality products with high durability, heat resistance, scratch resistance, and weather impact.

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PRE-TREATMENT

After being uncoiled, the steel strip is first treated at the pre-treatment tank including degreasing, pickling, and cleansing. This process is designed to smooth the surface and increase adhesion of zinc during the plating process.

ANNEALING AND PLATING

Annealing is the next process. In the annealing furnace, heat cycle is applied to obtain the required mechanical properties and activate the surface with a reducing gas, which makes it easy to coat zinc on the strip surface.

After that, Zinc plating is done through a zinc pot after annealing process in order to secure processability and the quality of the material of the final product. The amount of plating shall be adjusted to the customer request by air blowing (air knife) located above the pot.

COOLING

After plating, the strip is still hot and will be cooled through cooling system and water tank to decrease the temperature of strip down to 600oC – 800oC; moreover, clean up all the mixture of salt, zinc dust, and other impurities in order to keep the surface always clean before going through the next process.

POST-TREATMENT

The steel strip will be dried up by a pair of rubber rollers after go through water tank, then continue to be immersed in a chromic (Cr) bath. This process will help increasing rust resistance for the surface and against weather impact.

SPECIFICATION

Base metal:	CRC
Thickness (mm):	0.12 to 0.80
Width (mm):	600 to 1250
Coil weight (ton):	Maximum 10 tons:
Inside diameter (mm)	508

TECHNICAL STANDARD

T-Bend:	≤4T
Impact test:	100% no peel off
Coating thickness:

No.	Thickness of CR sheet	Zinc coating range (JIS G3302)	Thickness of GI	Width
1	0.13mm	Z6	0.15mm	762mm
2	0.13mm	Z6	0.15mm	900mm
3	0.13mm	Z6	0.15mm	990mm
4	0.16mm	Z6	0.18mm	1200mm
5	0.17mm	Z6	0.19mm	900mm
6	0.17mm	Z6	0.19mm	914mm
7	0.18mm	Z6	0.20mm	762mm
8	0.18mm	Z6	0.20mm	914mm
9	0.18mm	Z8	0.20mm	1000mm
10	0.18mm	Z8	0.20mm	1200mm
11	0.19mm	Z6	0.21mm	762mm
12	0.19mm	Z8	0.21mm	914mm
13	0.20mm	Z8	0.22mm	914mm
14	0.20mm	Z8	0.22mm	1000mm
15	0.20mm	Z8	0.22mm	1200mm
16	0.22mm	Z8	0.24mm	1200mm
17	0.26mm	Z8	0.28mm	1200mm
18	0.28mm	Z8	0.30mm	1200mm
19	0.30mm	Z10	0.32mm	1200mm
20	0.32mm	Z10	0.34mm	1200mm
21	0.35mm	Z10	0.37mm	1200mm
22	0.40mm	Z10	0.42mm	1200mm
23	0.45mm	Z10	0.48mm	1200mm
24	0.50mm	Z12	0.53mm	1200mm
25	0.60mm	Z15	0.63mm	1000mm
26	0.60mm	Z15	0.63mm	1250mm
27	0.70mm	Z15	0.74mm	1000mm
28	0.70mm	Z15	0.74mm	1250mm
29	0.80mm	Z15	0.84mm	1000mm
30	0.80mm	Z15	0.84mm	1250mm
31	0.88mm	Z18	0.92mm	1000mm
32	0.88mm	Z18	0.92mm	1250mm
33	1.00mm	Z18	1.06mm	1000mm

*Note: Coating thickness may be varied, depends on customer’s request.

QUALITY FEATURES

Corrosion Resistance	Physical Protective Action	If Zn is exposed to the air as a reactive metal, it becomes zinc oxide by sharply reacting with oxygen and also forms a thin film of basic zinc carbonate by reacting with carbon dioxide. This thin film prevents rust from corrosive environment with good dense adhesion.
	Corrosion Resistance in the air	The life of Galvanized Steel is proportional to the coating weight of Zn. For same coating weight, however, the life may be largely changed by the usage environment. The corrosion resistance of galvanized steel in a city or industrial area is just 25~40% compared to an unpolluted rural area. The interior life at the same area is longer 5-10 times than the exterior life.
Formability	Due to excellent adhesion of Zn and ultra-thin alloyed layer of Fe-Zn, flaking hardly does not occur even after drawing work. Its formability is very excellent as much as cold rolled steel plates and it is available for diverse works.
Paintability	Galvanized Steel is mostly used after final coating, and the corrosion resistance of painting products depends on the disk, pre-treatment before painting and a kind of paint and varnish.
Weldability	For it has better electric conductivity than iron, such good conductivity makes electric resistance on the contact surface of the steel plate small and heating value is also small.
	It has the lower meting point than iron. So, Zn attaches to electrode when welding and such attachment causes low continuous weldability.
	Its current density falls a little bit due to comparatively wide contact areas by welding force (electrode force).