What is cold rolled steel?

Cold rolled steel is the production of steel under cold rolling. Cold rolled steel is using No.1 steel plate to further rolled to the target thickness at room temperature. Compared with hot rolled steel plate, the thickness of the cold rolled steel plate is more accurate, and the surface is more smooth and beautiful. At the same time, cold rolled steel has variety of excellent mechanical properties, especially the processing performance. Because cold rolled raw rolls are more brittle and is not suitable for processing, so before handing over to the customer , cold rolled steel sheet is usually required with annealing, pickling and surface flatness. The maximum thickness of cold rolling is below 0.1--8.0MM, the minimum thickness and width are determined by the equipment capacity and market demand .

The classification of cold rolled steel products: hot rolled pickling, rolling hard roll, cold-rolled, galvanized, electric galvanized, fingerprint resistant, hot galvanized), galvanized, tin plating, and painted, electrical steel (silicon steel sheet) and so on.

Cold rolled steel is widely used, such as automobile manufacturing, electrical products, locomotive, rolling stock, aviation, precision instruments, food cans, etc. With the development of economy, cold rolled steel plate has been called the material of the modern society.

The difference between cold rolled steel and hot rolled steel is not the smelting process, but the rolling temperature, or the ending temperature of rolling mill. Hot rolled steel is easy to rolling with high efficiency of rolling, but because the oxidation of steel in hot rolling condition, the surface of hot rolled steel is black and gray. Cold rolled steel requires high power but low rolling efficiency. In order to eliminate work hardening ,cold rolled steel will need intermediate annealing, so the cost is higher, but the surface of cold rolled steel will be lighted in better quality. It can be directly used to process finished products, so the application of cold rolled steel plate is very wide.

What is hot dip galvanized steel coil

Hot dip galvanized steel coil is steel coil with a pure zinc coating through the hot dip galvanizing process. Hot dip galvanized steel coil gets coated in layers of zinc to protect against rust. Steel coil with galvanized, the user will be allowed to be applied in outdoor fabrication projects. Most of the time, hot dip galvanized steel coil is used in many kinds of applications within metal structure on the facilities of the industry.

Production flow:

Hot dip galvanized steel coil process: Iron clean, then solvent treatment, drying after immersed in liquid zinc, zinc alloy layer of a generation of iron and zinc melting reaction, the process is as follows: - water - degreasing Pickling - plating - drying - Hot - Separation - cooling passivation.

Main Features of the Hot Dip Galvanized Steel coil

1, Low processing costs: hot dip galvanized steel coil costs less than the other antirust paint coating ;

2, Durable: in the suburbs of the environment, the standard of hot dip galvanized steel coil can be maintained for more than 50 years without repair; in urban areas or offshore areas, the standard of hot dip galvanized layer can be maintained for 20 years without repair;

3, The reliability is good: galvanized layer and steel is a metallurgical combination, become a part of the steel surface, so the durability of the coating is more reliable;

4, The coating of the toughness is strong: galvanized layer coat a special metallurgical structure, this structure can withstand the delivery and use of mechanical damage;

5, Comprehensive protection: zinc coat each part of the plating, fully protected the plating even in the sag of sharp corners and hide;

6, Save time and effort: the process of zinc coating is more quickly than other coating construction method, also avoid the time required to paint on the site after the installation.

7, The initial cost is low: in general, hot dipping zinc cost is lower than the other protective coating, other protection coatings such as sand paint is a labor intensive process,but the process for hot dip galvanizing is high mechanization, closely controlled plant construction.

8, Simple test: the test of hot dip galvanized coating thickness surface layer can be visual and simple and non destructive.

9, Reliability: General specifications of hot-dip galvanized steel coil in accordance with BS ISO 1461 EN, the lowest limit of zinc layer thickness, so the antirust period and the performance is reliable and predictable.

The development of hot dip galvanized steel coil

Due to the development of industry, hot dip galvanized steel coil have been used in many fields, the advantages of hot dip galvanized is adaptation to the environment and has been a very popular method of anti-corrosion treatment. Now it is widely used in power transmission tower, communication tower, railway, highway protection, street lights, marine components, building steel structure components, substation auxiliary facilities, light industry, etc. Hot dip galvanized steel coil plays an important and irreplaceable role in steel corrosion, saving energy and material saving. At the same time they are short-term high value-added products will support and priority develop the steel making of China.