Galvanized steel coil is a material produced by continuous hot-dip galvanizing process with hot-rolled steel strip or cold-rolled steel strip as the substrate. Hot dip galvanized coil supplied in coil form after coiling. Therefore, galvanized steel sheet (coil) can be divided into hot-rolled galvanized sheet coil and cold-rolled hot-dip galvanized sheet coil. They are mainly used in the fields of construction, household appliances, automobiles, containers, transportation and household industry. Especially in steel structure construction, automobile manufacturing, steel warehouse manufacturing and other industries. Their main characteristics are: strong corrosion resistance, good surface quality, benefit from deep processing, economy and practicality, etc.
Galvanized Steel Coil gets coated in layers of zinc because rust won't attack this protective metal. The most external layer is all zinc, but successive layers are a mixture of zinc and iron, with an interior of pure steel. These multiple layers are responsible for the amazing property of the metal to withstand corrosion-inducing circumstances. Zinc also protects the steel by acting as a "sacrificial layer." If rust does take hold on the surface of Galvanized steel coil, the zinc will get corroded first. This allows the zinc that is spread over the breach or scratch to prevent rust from reaching the steel. For countless outdoor, marine, or industrial applications, Galvanized steel coil is an essential fabrication component.
The requirements of chemical composition of galvanized coil are different in different countries. The national standard is to detect the content of carbon, manganese, phosphorus, sulfur and silicon.
Product Specification
| Product | Galvanized Steel Coil |
| Standard | ASTM, BS, EN, DIN, GB, JIS, ASME, etc. |
| Grade | Dx51D, Dx52D, Dx53D, DX54D, S220GD, S250GD, S280GD, S350GD, S450GD, S550GD; SGCC, SGHC, SGCH, SGH340, SGH400, SGH440, SGH490, SGH540, SGCD1, SGCD2, SGCD3, SGC340, SGC490, SGC570; SQ CR22 (230), SQ CR22 (255), SQ CR40 (275), SQ CR50 (340), SQ CR80(550), CQ, FS, DDS, EDDS, SQ CR33 (230), SQ CR37 (255), SQ CR40 (275), SQ CR50 (340), SQ CR80 (550); or Customer’s Requirement |
| Thickness | 0.12~3.00 mm (cold rolled), 1.20~4.60 mm (hot-rolled) |
| Width | 600mm-1500mm or 914mm/1000mm/1200mm/1219mm/1220mm |
| Tolerance | Thickness: ±0.01 mm |
| Width: ±2 mm |
| Coil ID | 508 mm - 610 mm |
| Coil weight | 3 Tons - 8 Tons or as client requirement |
| Zinc coating | 30g/m² - 600g/m² |
| Spangle | Regular Spangle, Minimum Spangle, Large Spangle, Zero Spangle |
| Surface treatment | Oil, Passivation, Chromated, Skin-passed, Anti-finger Print |
| HS code | 72104900.00 |
| Loading Port | Tianjin Port, Qingdao Port, Shanghai Port |
| Payment Term | L/C or T/T(30% deposit) |
| Delivery time | Within 15 workdays after deposit received |
| Package | plastic film + water proof paper + steel plate + packing steel strip |
| Application | Widely used in road, railway, civil construction, water conservancy construction; all kinds of machinery, electrical appliances, window protection and aquaculture, etc. |
Chemical composition
| STEEL GRADE | CHEMICAL COMPOSITION % | MECHANIC PROPERTY | C.B OF | COATING |
| C | Si | Mn | S | P | T.S | Y.S | E.L | COATING |
| x103 | x103 | x102 | x103 | x103 | Mpa | Mpa | % | d=0 180° | G/M² |
| JIS G3302 SGCC | 12 | 30 | 41 | 31 | 21 | 480 | 300 | 13 | OK | Z60-150 |
| JIS G3302 SGCH | 12 | 10 | 21 | 18 | 8 | 680 | 650 | 20 | OK | Z60-150 |
| ASTM A653 CS.B | 29 | 30 | 60 | 35 | 30 | 386 | 250-380 | 20 | OK | Z60-275 |
| DX51D+Z | 20 | 21 | 18 | 1.8 | 11 | 355 | 245 | 38 | OK | Z60-275 |
| G550 | 12 | 6 | 73 | 5 | 17 | 715 | 654 | 8 | OK | Z60-275 |
Mechanical properties of galvanized steel
| Usage | Grade | Yield strength(Mpa) | Tensile strength(Mpa) | Elongation rate % |
| Punching galvanized steel | DC51D+Z | - | 270-500 | ≥20 |
| DC52D+Z | 140-300 | 270-420 | ≥22 |
| DC53D+Z | 140-260 | 270-380 | ≥26 |
| DC54D+Z | 140-220 | 270-350 | ≥30 |
| Structure galvanized steel | S220GD+Z | ≥220 | ≥300 | ≥18 |
| S250GD+Z | ≥250 | ≥330 | ≥17 |
| S280GD+Z | ≥280 | ≥360 | ≥16 |
| S320GD+Z | ≥320 | ≥390 | ≥15 |
| S350GD+Z | ≥350 | ≥420 | ≥14 |
| S400GD+Z | ≥400 | ≥470 | - |
| S500GD+Z | ≥500 | ≥530 | - |
| S550GD+Z | ≥550 | ≥560 | - |
Product Display
We can produce different sizes, thicknesses, widths and materials according to your requirements
Advantages
1.Available for customized specification on customers’ request.
2.Perfect Corrosion Resistance. The service life of galvalume is 3-6times as long as that of galvanized surface.
3.Perfect Processing Performance. Fully meet the requirement of roll processing, stamping, bending, ect.
4.Perfect Light Refelectivity. The ability of reflecting light and heat is twice that of galvanizing.
5.Perfect Heat Resistance. Galvalume products can be used at 315 degree Celsius for a long time without discoloration.
6.Excellent adhesion between the paint. Easy to paint and can be painted without pretreatment and weathering.
Galvanized Steel Coil Types
According to the processing method, we divide galvanized steel into the following categories:
1. Hot-dip Galvanized Steel Coil
As the name implies, hot-dip galvanizing is immersing the cleaned iron sheet into the molten zinc bath at about 500 degrees to form a zinc layer. It is the most commonly used method. It has some advantageous features:
1) The entire steel surface is uniformly covered with a zinc layer, even the corners, hollows, etc. so that the steel sheet is fully protected.
2) The cost of hot-dip galvanizing is cheap.
2. Electro-galvanized Steel Coil
Electro-galvanizing is a process of applying a layer of zinc to steel through electroplating, with a saline anode and steel conductor. It is able to enhance the corrosion and heat resistance of steel. Also, it makes steel sheets more good-looking.
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