TISCO DX51D SGCC coating cold rolled galvanized steel coil for
roofing sheet
Galvanized Steel Coil Introduction
Cold-rolled galvanized sheet is a kind of galvanized steel sheet.
Steel sheets are classified into two types: hot-rolled and
cold-rolled. Cold-rolled sheet is flat, rectangular, and can be
directly rolled. Cold rolling is a steel sheet in which the steel
sheet is further thinned to a target thickness at room temperature.
Compared with hot-rolled steel sheet, cold-rolled steel sheet has
more accurate thickness, smooth and beautiful surface, and also has
various superior mechanical properties, especially in terms of
processability. Because cold-rolled raw coils are relatively
brittle and hard, and are not suitable for processing, cold-rolled
steel sheets are usually required to be annealed, pickled and
surface smoothed before being delivered to customers. The minimum
thickness of cold rolling is below 0.1--8.0MM.
Thickness | 0.13-3.0mm |
Width | Galvanized steel strip:24-600 mm; galvanized steel coil:600-1250mm |
Coil weight | Usually is 3-4.5 tons,the max coil is 10 tons |
Zn coating | 0.13-0.8 mm is 30-150 g/m2; 0.8-1.5 mm is 30-180 g/m2;1.5-6.0 mm is
30-275 g/m2 |
Coil ID | 600-1500 mm,Normal width is 91 4/1000/1219/1250/1500 mm |
Steel grade | DX51D,DX52D,DC01,DC02,SGHC |
Surface | regular/mini/big/zero spangle,skin pass, chromated, unoiled, dry |
Packaging | seaworthy export standard package, or according to the
customers’requirement |
Delivery time | With 15 –25 days after receipt of deposit or L/C |
Market | North/South America, Europe, Asia,Africa,Mid East |
Productivity | 2000 Metric ton /month |
A zinc coating is one of the most effective and economical methods
of protecting bare steel from a corroding environment. The zinc not
only serves as a barrier between the steel and the environment, but
it will also sacrifice itself to protect the underlying steel
sheet. Sacrificial or galvanic protection occurs when two
dissimilar metals are in contact and coupled with water and oxygen.
Zinc corrodes preferentially to the iron in steel. This protection
prevents corrosion of the steel at areas not covered with zinc.
Thus, the spread of corrosion from cut edges, drill holes, etc. is
minimized.
Advantages of Galvanized Steel
The main advantage of galvanized steel is its corrosion resistance.
The zinc coating serves as a barrier between the steel and the
environment and will sacrifice itself in order to protect the
underlying steel; Meaning the zinc will degrade much sooner than
the steel itself. Additionally, it offers good processability and
formability.
Hot dipped galvanized steel sheet & coil is made of carbon steel
coated in zinc utilizing the hot-dip process. The end result of
this process is a layer of zinc on each side of the steel sheet or
coil that is tightly adhered to the steel through the formation of
an iron-zinc alloy bonding layer. This bonding layer is formed by a
diffusion process while the heated steel is in contact with molten
zinc. Chesterfield can provide hot dipped galvanized steel sheet &
coil to meet your ASTM requirements with customer-driven surface
finish options.
It is mainly used in construction,automotive ,metallurgical and
electrical industries In the construction industry,mainly used for
making roofs and walls,prefabricated keel,pre-cast bulkhead,doors
and windows.In automotive industry ,mainly for body shell, chassis
,doors,fuel tanks, etc In metallurgical industry,mainly used as substrate of PPGI. In electrical in
industry,mainly for shell of electrical appliance.
