What are the materials of galvanized sheet? Material standards of galvanized sheet
Galvanizing is an economical and effective anti-corrosion method that is often used. Galvanized sheet refers to a steel sheet with a layer of zinc on the surface. The material of galvanized sheet can be roughly divided into two categories: non-alloy hot-dip galvanized steel strip and alloyed hot-dip galvanized steel strip. The material standard of galvanized sheet actually refers to the chemical composition requirements of the galvanized sheet substrate. The standards of different countries are different. The national standard generally tests the content of carbon, manganese, phosphorus, sulfur and silicon. Let's take a look with the editor.
What are the materials of galvanized sheet?
1. Non-alloy hot-dip galvanized steel strip
DC5XD series: can be used for general purpose, deep drawing and biting. The higher the zinc content on the surface, the better the anti-corrosion performance; the smaller the surface zinc content, the better the processing performance.
SXXXGD series: can be used for structure, with good processing performance and anti-corrosion performance.
HXXXPD Z series: including low alloy steel, phosphorus steel and hardened steel, with excellent processing performance and corrosion resistance.
2. Alloyed hot-dip galvanized steel strip
DCXXD ZF series: can be used for structural, stamping, and cold forming purposes. The galvanized sheet of this material has superior welding and coating properties, but it is very prone to peeling during processing.
Material standard for galvanized sheet
1. Material standards for contact agents
Zinc chloride and ammonium chloride contact agents should be colorless or light yellow crystals, with two grades to choose from, and should come with wetting agents.
2. Material standard for zinc aluminum alloy
The chemical composition ratio of zinc aluminum ingots added to the zinc pool during hot-dip galvanizing process should be:
Aluminum=4.5-5.0%, copper=maximum 0.001%, magnesium=maximum 0.002%, lead=maximum 0.003%, iron=maximum 0.003%, cadmium=maximum 0.002%, Sh=maximum 0.002%
Please note that a zinc aluminum ingot weighs approximately 9.5-10kg and must be delivered with a certificate of compliance with this standard,
3. Material standard for zinc lead alloy
The hot-dip galvanized zinc ingot (zinc plate) should meet the requirements of ASTMB-6-95, with a lead content of approximately 1% according to the original Western Standard. The chemical composition ratio of zinc ingots should be: lead should be 0.5-1.4%, iron<0.05%, cadmium<0.01%, copper<0.002%, tin<0.001%, aluminum<0.005%. Note that the weight of one zinc ingot is approximately 25kg, and a certificate of compliance with this standard must be provided upon delivery.
Current status of galvanized sheet development
At present, there is still a certain gap between my country's steel industry and the world's advanced level in terms of variety, quality, cost, service and labor productivity. In the face of increasingly fierce international and domestic market competition, it is necessary to accelerate the pace of structural adjustment. This is not only the need for the survival and development of my country's metallurgical industry, but also the development trend of the world's metallurgical industry today. Hot-dip galvanizing was invented in the middle of the 18th century. It was developed from the hot-dip galvanizing process. After fifty years of development, the continuous hot-dip galvanizing process for steel strip has become a mature and technologically advanced industrial technology. So far, hot-dip galvanizing is still the most commonly used and effective process measure in steel corrosion protection methods. In the construction industry, it is used for light steel keels, building layer panels, corrugated boards, rolling shutters, etc. in various industrial and civil buildings; in home appliances and light industry, it is used for the shells and bottom plates of various home appliances; galvanized steel sheets are widely used in light industry, home appliances, automobiles and construction industries. In the automobile industry, it is used for the body, shell, inner plate, bottom plate, etc. of automobiles. my country has vigorously developed electricity, transportation, communications, energy and urban infrastructure. With the strong development of the construction, home appliances and automobile industries, my country's galvanizing industry faces unprecedented opportunities and a huge market. In the past two decades, the continuous hot-dip galvanizing technology, equipment and corresponding control methods for steel strips have made great progress, enabling galvanized sheets to meet the requirements of automotive panels and home appliance panels, and thus have a great tendency to replace them with their low price and excellent corrosion resistance than electroplated zinc alloy steel strips. This project intends to learn from foreign advanced high-performance automotive hot-dip galvanizing production technology and equipment development technology and experience, and break through the bottleneck restricting the development of high-performance automotive hot-dip galvanized steel plate production technology and equipment in my country through technological innovation, optimized design, precision manufacturing and foreign technical cooperation. At the same time, it explores the important significance and prospects of hot-dip galvanizing technology development in the sustainable development of the national economy, energy conservation, and mineral resources.
