Galvanized Coils Description
Z275 galvanized steel coil is a carbon steel sheet coated with zinc
on both sides, produced by a metal coating process that passes the
cold rolled coil through a bath filled with molten zinc.
The zinc layer forms a metallurgical bond with the steel substrate,
the zinc layer not only acts as a barrier to isolate the corrosive
environment, but also provides cathodic protection through the role
of sacrificial anodes, and can continue to protect the steel
substrate even if the coating is partially damaged
According to the production and processing methods, it can be
divided into the following categories:
- Hot-dip galvanizing: The steel coil is passed through a molten zinc liquid tank to
evenly cover its surface with a layer of zinc to form a zinc
coating. The coating of hot-dip galvanizing is thicker and has
great anti-corrosion.
- Electro-galvanizing:Zinc adheres to the steel coil surface through electrolytic
disposition. The coating of electro-galvanizing is thinner, but the
surface is smooth and suitable for delicate applications.
Zinc Spangle is a surface morphology of hot-dip pure zinc coil,
when the steel strip passes through the zinc pot, the surface is
coated with liquid zinc, and then in the process of natural
solidification of the zinc layer, the zinc grain nucleus grows and
zinc spangle appears.The surface of the hot-dip pure galvanized
coils produced had zinc sparks of various sizes and shapes.
GI Coil Specification
Width | 30-1500mm |
Thickness | 0.12-4.0mm |
Tolerance | Thickness& Width:+/-0.02mm |
Zinc coating | 30-275g/m2 |
Package weight | 2 -6 ton per coil |
Surface | Passivation,Fat liquoring,Stop-off lacquer |
Hardness | HRB50-71(CQ Grade),HRB45-55(DQ Grade) |
Tensile Strength | 270-500(CQ Grade),270-420(DQ Grade) |
Yield Strength | 140-300 (DQ Grade) |
Spangle coating | Big Spangle, small Spangle,Spangle-free |
Surface Treatment | Passivation(C),Oiling(O),Lacquer
sealing(L),Phosphating(P),Untreated(U) |
Surface Structure | Normal spangle coating (NS),minimized spangle
coating(MS),spangle-free(FS) |
Standard | EN 10142,EN 10147,EN 10292,JIS G3302, ASTM A653/A653M, BQB 420 |
Grade | Q195,Q235,Q235B,Q345,Q345B,SGCH,JIS G3302, ASTM A653,S280GD+Z,
S350GD+Z,SGCC, DX51D/ DX52D, SGCC,DX51D+Z/ DX52D+Z,etc |
Application | Building , Corrugated sheet Roofing, electrical, Appliances,
Automobile industry,
Transport Packaging ,Machinery processing ,Interior decoration ,
Medical |
Packaging | Inside:Anti-rust paper,Plastic.
Outside:Steel inner and outside guard board,Circle Iron guard board
for both side, Outside iron guard board, 3 Radial Strapping and
3 Latitude Strapping.
We can also pack according to your requirement. |
Galvanized steel sheet is cut from galvanized steel coil, the base
material is cold rolled steel, it has good processing performance.
The galvanized sheet coated with a zinc layer,features a smooth,
flat,uniform thickness, strong adhesion, no peeling during
processing, good corrosion resistance,and excellent adhesion to
paint film. It can withstand high temperatures up to 315 ℃ and has
excellent surface conductivity. The surface is smooth and clean,
the size is accurate, the board surface is straight, the spangles
are even and beautiful.
GI Coil Surface Structure
Galvanized Steel Features
Galvanized steel coils have high adhesion,corrosion resistance, and
precisely controlled coating thickness. In addition,Galvanized
steel is easy to process and weld, and also has a long service life
when exposed to the atmosphere.
- Excellent anti-corrosion:
Galvanised Steel has excellent corrosion resistance,the zinc
coating layer has better electrochemical protection on steel than
painting and plastic coating.It can last for decades of years
without any problem of peeling off,and also higher collosion and
scratch resistance.
Not only will the zinc coating play the role of a physical barrier
but also protects the steel underneath through electrochemical
reactions (sacrificial anode action) when the coating is scratched
or damaged.
Hot-dip galvanized steel coils maintain the processability of
steel, and the zinc layer is thin and uniform, which does not
affect the performance of steel during processing and forming.
Galvanized steel has good thermal resistance,can be used for long
time without discoloration below 230℃, and it will discolor when it
exceeds 250℃.
GI Sheet Processing Service
We offer value-added services including polishing, annealing, heat
treatment, and welding for GI steel.
Process
Service:Bending,Welding,Decoiling,Punching,Cutting,Moulding,or as
requirement
GI Coil Packing
| Packing Details | Standard Seaworthy Package or according to customer's requirements |
| Container Size | 20ft GP:5898mm(Length)x2352mm(Width)x2393mm(High) 24-26CBM
40ft GP:12032mm(Length)x2352mm(Width)x2393mm(High) 54CBM
40ft HC:12032mm(Length)x2352mm(Width)x2698mm(High) 68CBM |
Galvanized Coil Material Testing
- Mechanical Testing Such as Tensile of Area
- Hardness Test
- Chemical Analysis – Spectro Analysis
- Positive Material Identification – PMI Testing
- Hardness Test
- Micro and MacroTest
- Pitting Resistance Test
- Flaring Test
- Intergranular Corrosion (IGC) Test
FAQ
Q: Do you provide samples ? is it free or extra ?
A: The sample could provide for customer free,but the freight will
be covered by customer account.
Q: Do you accept the third-party inspection?
A: Yes,absolutely we accept.
Q: How could you guarantee your products?
A: Each piece of products is manufactured by certified workshops,
inspected by HNJBL piece by piece according to national QA/QC
standard. We also could issue the warranty to customer to guarantee
the quality.
Q: How can I get your quotation as soon as possible?
A: The email will be checked within 6 hours,and the Wechat and
WhatsApp will be online 24 hours.Please send us your requirement
and order information,specification(Steel
grade,size,quantity,destination port),we will work out the best
price soon.
