Shanghai Huiyi International Co., Ltd.
Shanghai Huiyi International Co., Ltd.
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Coated Sheets GI Sheets Hot Dip Galvanized Steel Sheet Plates
Introduction of galvanised steel sheet :
Galvanized steel sheet is one of the most widely used products, used extensively in the building sector, automotive, agricultural and other areas where the steel needs to be protected from corrosion.
Description of galvanised steel sheet :
Details of galvanised steel sheet :
| Total Coated | Area Per Ton | % Area more in Galvalume® over Galvanised | |
|---|---|---|---|
| Sheet Thickness | Galvalume® Coated | G-90 Galvanized | |
| mm | Sq.meter | Sq.meter | % |
| 0.3 | 406 | 384 | 6 |
| 0.38 | 320 | 306 | 5 |
| 0.64 | 188 | 183 | 3 |
| 1 | 116 | 114 | 2 |
Characteristics of galvanised steel sheet :
| Spangle | Surface Treatment | Oiling | Surface Roughness | Cold Treatment | Edge Condition |
| Regular / Minimized / Suppressed | Chromated Cr+6 / Chromated Cr+3 (as per ROHS norms) / Acrylic coating AFP (Cr+6) | Oiled / Unoiled | 0.6 - 2.0 microns (for Skin Passed) | Non Stretch Leveled / Stretch Leveled / Skin Passed | Slit / Mill edge |
Advantage of galvanised steel sheet :
| Item | Classification | Symbol |
| Coating type | Al-Zn alloy | AZ |
| Surface finish | Regular spangle | R |
| Minimized spangle | M | |
| Skin passed | S | |
| Surface treatment | Chromate passivated | c |
| Non-chromate passivated | C5 | |
| Chromate passivated + oiling | CO | |
| Non-chromate passivated+oiling | CO5 | |
| Anti-fingerprint | N | |
| Non-chromate anti-fingerprint | N5 | |
| Non-chromate high weather resistance anti-fingerprint | NW | |
| Oiling | 0 | |
| No treatment | U |
Detailed Steps Of The galvanised steel sheet Processing
Step 1:
Pre-treatment: After the cold-rolled coil arrives in the galvalume workshop, after passing through the uncoiler, through the degreasing section and the reduction furnace, the steel coil is cleaned and its components are reduced to the extent that it can be galvanized.
Step 2:
Central section: The most critical technology is this step. After passing through the zinc pot, a layer of zinc layer is plated on the surface of the steel plate. After coming out of the zinc pot, it is cooled and shaped by the cooling tower.
Step 3:
Post-processing: The steel plate finally comes to the post-processing stage after various processes. After finishing, straightening and passivation, and finally coiling.
People use it as material for heat-insulation for its thermal reflectivity as high as twice the galvanized steel sheet.
The aluzinc steel sheet could bear above 300℃ high temperature with its good performance in heat-resistance, quite similar to the aluminized steel sheet’s performance in oxidation-resistance under high temperature. It is often used for chimney pipe, oven, illominator, and fluorescent lamp cover.
The essential of galvalume steel coil’s corrosive-resistance lies at aluminium’s protective property. Once the zinc come under abrasion, the aluminium would form a layer of densified oxidized aluminium, preventing the interior from further corrosion.
The density of 55%AL-Zn is smaller than Zn, therefore, with the same weight and thickness of coating, the galvalume steel sheet is 3% larger in area than that of galvanized steel sheet.
There is perfect adhesiveness between galvalume sheet and paint, saving the process of pre-treatment and weathering for painting work.
The coating material on the galvalume steel sheet is outstanding in its adhesiveness, which could be directly tarring on the advertising board and commonly used board with no pre-treatment such as weathering process.
Here are the pictures of our Mill as reference :
FAQ:
Q1:What are your company's main products?
A2: Our main products are Carbon Steel Coil/Sheet,Galvanized Steel Coil/Sheet,Stainless Steel Coil/Sheet, round/square pipe, bar, channel, perforated shseet etc.
Q3: How do you control quality?
A3: Mill Test Certification is supplied with shipment, Third Party Inspection is available. and we also get ISO,SGS,Alibaba Verified.
Q4:What are the advantages of your company?
A4: We have many professionals, technical personnel, more competitive prices and best after-dales service than other steel companies.
Q5: How to get samples?
A5:FREE samples are available for your checking and testing.