Complaint
Galvanized coil is defined as cold rolled carbon steel sheet coated with zinc on both sides.
Zinc coating is considered to be one of the most effective and economical method of protecting base steel from a corrosive environment and severe weather change.
Zinc is more durable than pure steel according to chemical activity. Zinc is stable in dry air. If humid air, Zinc Carbonate will be formed as protection outside. Besides, zinc layer also sacrifices itself as a damage protection for the base steel sheet.
Detailed parameters are shown as following chart:
| Product Name | Hot Dipped Galvanized Steel Coil |
| Standard | JIS G3302 1998, ASTM A653M/A924M 2004,A792/A792M, JIS G 3321, EN 10346 or at your request |
| Grade | SGHC, SGCC, DX51D, Q195,DX51D+AZ ASTM a792 or at your request |
| Thickness | From 0.12mm to 5.0mm |
| Width | From 100mm to 1250mm |
| Zinc coating weight | 17-600gsm, double side, equal thickness |
| Spangle | big spangle, normal spangle, small spangle, zero spangle |
| Hardness | Normal (HRB70±5), Full hard (HRB90±5) |
| Surface treatment | Chemical passivating, oiled,unoiled, passivating + oils,Anti-Fingerprint ,Chromated,Skin passed, high weather resistance,etc |
| Edge | slit edge, mill edge (for splitted coil) |
| Coil ID | 508mm/610mm |
| Coil weight | 3-10 tons, at your request |
| Delivery time | within 7 days after receipt of deposit or L/C,T/T |
| Business type | Supplier and manufacturer |
The core procedure of galvanizing process is putting the carbon steel sheet into the molten zinc pot, about 450 Celsius degree, then a zinc layer film adhere to the base carbon steel sheet. It's produced by the continuous hot dipping galvanizing process. So it's technically called hot dipped galvanized steel coil or sheet;
Simplifeid producing process outline:
Decoiling - Cleaning - Annealing - Zinc pot -Air knife - Cooling Tower - Straightening and Passivation - Post-treatment - Recoiling
Step 1:
Pre-treatment: When the cold rolled coil arrives at the workshop,firstly going through the uncoiler machine, through the degreasing section and the reduction furnace, the steel coil surface is cleaned and the components are adjusted to the proper ratio for the next galvanizing procedure.
Step 2:
Core section: The uncoiled steel sheet goes into the molten zinc pot. After the zinc pot, dense zinc layer adhere to the surface of the steel sheet. Then it is cooled and shaped by the cooling tower.
Step 3:
Post-processing: The steel sheet comes into the post-processing stage. Going through procedures including finishing, straightening and passivation, finally recoiling. At this point, the well known silver shining galvanized steel coil is done.
THEORETIC SKETCH:
REALISTIC STRUCTURE:
OUR WORKSHOP PICTURE:
| Surface treatment type and function | |
| Surface treatment | Function & Features |
| Chemical passivating treatment | minimize the chance of white rust forming during the transit and storage |
| Oiled | minimize the tendency for storage and transit stain |
| passivating + oiled | provide the protection from the storage and transit stain by special chemicals called corrosion inhibitors |
| Anti-Fingerprint | Transparent and thin organic resin film adhere to the coil surface.So the fingerprint stain can be avoided,and enhancing the anti-corrosion property. |
| Chromated | Passivation treatment with chrome,enhancing the anti-corrosion property,so the base metal can get better protection;giving steel coil a dim color as surface appearance |
| Skin passed | Steel coil will become more straight and flat, getting an even and consistent appearance,enhancing the adhesion; |
Spangle:
Galvanization or galvanizing is the process of applying a protective zine coating to the the base steel sheet,to prevent mechanical damage and corrosion.The size of zinc crystalline grain on galvanized coating surface is a visible and constant feature,which is known as "spangle". Different spangle types differs not only on appearance, but also on mechanical property, which is also classified for different application, as shown in the below chart:
| Surface Type | Pattern | Application |
| Big spangle | Big spangles with leaf size pattern | Civilian use |
| Normal spangle | Standard spangles with flower size pattern | General use |
| Small spangle | Smaller spangles than normal | General painting application |
| Zero spangle | None spangle | Special painting application |
This is the principle diagram of anti damage and corrosion:
This is the detailed process diagram:
Shipping solution: we build firm cooperation with experienced international shipping company as well as outstanding freight forwarder managers, offering full solution for shipment, including choose the right container or bulk, safe and firm reinforce method, shortest shipping period, and the suitable custom clearance documents material;
Or you can choose your designed freight forwarder;
Standard export packing:
water proof paper is inner packing, galvanized steel or coated steel sheet is outer packing , side guard plate , then wrapped by seven steel belt .
Fully strong export package suitable for ocean transportation, packed in waterproof paper/plastic foil, steel envelopes,strapped with metal bands, min 4 bands horizontal, 3 bands longitudinal.Add carton or steel sleeve in necessary.
1.4 widthwise bands and 4 longitudinal bands outside steel coil;
2.corrugated galvanized steel strip on inner and outer edges;
3.galvanized steel sheet and Kraft paper as the side wall protection.
4.galvanized steel sheet and Kraft paper wrapped around circumference and bore as protection.
Shandong Ruiqian Iron and Steel Co., Ltd. is located in Xingfu county, Boxing International Steel Trading Center. Our scale and reputation are both high ranking in China market with 20 years' trading experience. With the continuous development, our company's business scope is expanding to all over the world. Ruiqian Steel is committed to providing customers with high quality and cost effective galvanized steel products. With the belief of keeping promise and emphasizing quality, we have won the trust and loyalty of our customers.
We are mainly focusing on supplying galvanized steel coil, 55% galvalume steel coil , prepainted color steel coil , cold rolled coil and corrugated roof sheet. Special requirements such as width, zinc coat, and paint RAL color can be customized. Shandong Ruiqian Iron and Steel Co., Ltd., possess full industrial chain solution for our product. Beginning from cold rolled coil to galvanizing producing line, steel coil painting producing line, splitting line, roof sheet producing line, warehouse for stock and sea freight package team. Each procedure is with quality inspection, supervising and feedback, to guarantee the final product quality. We believe in helping our customer get success and happiness. Welcome to visit us, or just send a message to begin with.
Our exporting market includes South East Asia, South Asia, such as Pakistan, Bangladesh, Vietnam; Middle East, Africa, South America, and many others.
Thickness test: measuring accurate thickness of the plate by vernier caliper
Width test: measuring coil width by band tape
Zinc coating test: measuring zinc thickness by special apparatus, applying ultrasonic wave technology.
Impact test: measuring steel plate extending ratio
Bending test: measuring plate bending property
1.Q:How long is your delivery time?
A: 7 days after receiving the deposit or L/C at sight.
2.Q: Do you provide samples ? is it free or extra charged?
A:Sample is free, delivery freight would be on you.
3.Q:What's your payment terms?
A:LC,T/T,DDP,DDU,OA,and other payment terms can be discussed;
4.Q:How can you get a quick quotation?
A:Several parameters are necessary,such as:thickness,width,length,quantity,RAL colour,zinc coating,colour coating,delivery time,destination port; If you don't have these parameters, please tell us your application situation, your working plan with this product, then we can offer you best solution;
