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The difference between cold galvanizing and hot galvanizing:
Cold galvanized coatings are mainly anticorrosive by electrochemical principles. Hot dip galvanizing is a method of dipping steel members into molten zinc solution to obtain a metal coating. The corrosion resistance of hot-dip galvanizing is higher than that of cold galvanizing. And hot galvanizing will not rust in a few years, and cold galvanizing will rust in three months.
The zinc layer of hot dip galvanizing itself is relatively thick, with a thickness of more than 10um, although the surface is bright, but rough, there will be zinc flowers. The zinc layer of cold galvanized is very thin, only 3-5um thickness, although the surface is smooth, it will have gray and dirty performance, good processing performance and insufficient corrosion resistance.
Dx51d+z galvanized pipe Dx51d+z is the marking method of galvanized material, DX: English letter D means cold forming of flat stainless steel plate, the second English letter if X, it means that there is no need for cold rolling of the bottom steel plate; If the second English letter is C, it means that the bottom steel plate is required to be cold steel plate; If the second English letter is D, it means that the base steel plate is required to be hot-tied steel plate; 51~57: two large numbers indicate the grade of steel; The D after two large digits indicates the hot-dip galvanizing number.
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Dx53d+Z Surface classification and mechanical properties:
Polished zinc-free flower; Zinc layer symbol Z100; Oiled (oil grade Quaker N-6130)B surface.
Surface state: Due to the different treatment methods in the electroplating process, there are ordinary zinc flowers, fine zinc flowers, flat zinc flowers, zinc flowers and phosphating surface. The German standard also specifies surface grades.
Galvanized pipe should have a good appearance, no defects harmful to the use of products, such as no coating, holes, cracks and scum, coating thickness, wear, chromic acid stains, white rust and so on. Foreign standards for specific appearance defects are not very clear. Certain specific defects should be noted in the contract when ordering.
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Tianjin TISCO is a professional steel supplier. With the support of the most professional steel manufacturers and a large number of customers, we can not only provide you with ordinary steel, but also help you customize special steel, special size, special process shape and other services.
Tianjin TISCO uses standard export transport packaging and bundles steel bands according to the size of the stainless steel plate. We have frequent cooperation with freight forwarders to ensure the safe arrival of goods to the port.
According to our shipping experience, a 20-foot container can hold 22 tons of stainless steel, and a 40-foot container can hold 25 tons of stainless steel. For larger orders, we ship by bulk carrier, which is cheaper. Packaging can also be customized according to customer needs.
We provide our customers with planning services, just-in-time production planning and provide customized services to meet the specific requirements of end users. Our company has been committed to improving customer service and product quality for more than ten years, providing high-value solutions for customers' businesses as the basic standard of our work.
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