How should galvanized sheets be classified? China Galvanized Steel Roofing Sheet manufacturer understands two classification methods: one is based on the high quality Galvalumed steel panel, the other is based on the coating. Now let’s talk about the classification of installation substrates.
A. Carbon steel galvanized
The continuous hot-dip galvanizing of steel strips is mostly made of ordinary low-carbon steel, and its carbon content is between 0.10% and 0.20%. The galvanizing characteristics are similar to those of industrial pure iron. When hot-dip galvanizing is performed on ordinary low-carbon steel as a substrate, the most influential elements of the composition are carbon and silicon. In general, the higher the carbon content in the steel, the stronger the zinc-iron reaction, the larger the iron loss, and the thicker the alloy coating formed, making the coating brittle, the plasticity is poor, and the plating adhesion is poor. In addition, the high carbon content in the steel will also affect the surface quality of the coating, and often lead to the occurrence of leakage plating, and it is also easy to form zinc.
With the development of the automotive industry, there is an increasing demand for cold forming properties such as deep drawing of carbon steel. The carbon content in steel is desirably reduced as much as possible. For example, the carbon content of general stamped steel is less than 0.10%, and commonly used carbon. The content of not more than 0.08% (such as 08Al), the carbon content of high-quality stamped steel is not more than 0.04% (such as K08Al), while the ultra-deep stamped steel (such as gap-free atomic IF steel) reaches a carbon content of not more than 0.005%.
B. High-strength steel galvanized
In order to meet the needs of weight reduction, energy saving and safety of the automobile manufacturing industry, one of the main users of hot-dip galvanized steel sheets, hot-dip galvanized steel sheets with high-strength steel sheets as substrates have been developed rapidly. At present, high-strength steel plates that have been developed or are being developed abroad include IF high-strength steel, bake hardened steel, low-alloy high-strength steel, dual-phase steel, and phase-change-induced plastic steel, carbon-manganese high-strength steel, and martensitic steel. The level of strength they can achieve.