• Galvanized steel coil

    Galvanized-steel-coilb

Galvanized steel coil

Galvanized steel coils, also known as galvanized coils, are galvanized coiled products. Galvanized steel coil, a steel material coated with zinc on the surface, galvanized steel coil is the predecessor of galvanized sheet, thin steel sheet is immersed in a molten zinc bath to adhere the zinc layer to the surface, and plated by equipment The zinc coil is cut into a plate, and the galvanized coil is placed on the shelf by a forklift or a hanging crane and then conveyed, flattened and cut by the device. The steel sheet can also be produced by hot dip, but it is heated to about 500 ° C immediately after discharge to form an alloy coating of zinc and iron. The width is the standard width of one meter, one meter two five, one meter five five, and the length is random.

Use of galvanized steel coil

The coated steel plate has light weight, beautiful appearance and good anti-corrosion performance, and can be directly processed. It provides a new type of raw material for the construction industry, shipbuilding industry, vehicle manufacturing industry, furniture industry, electrical industry, etc. Wood, efficient construction, energy conservation, pollution prevention and other good results. The color coated steel plate using the galvanized steel plate as the substrate, in addition to the zinc protection, the organic coating on the zinc layer serves as a covering effect to prevent the steel plate from rusting and has a longer service life than the galvanized steel plate. The service life of the steel plate is 50% longer than that of the galvanized steel sheet.

However, in different regions and different parts of use, the use of the same galvanizing amount, the same coating, the same coating thickness of the color coated board, the service life will be very different. For example, in industrial areas or coastal areas, due to the action of sulfur dioxide gas or salt in the air, the corrosion rate is accelerated and the service life is affected.

During the rainy season, the coating is wetted by rain for a long time, or it is corroded faster and the service life is reduced in the parts where the temperature difference between day and night is too high and condensation is formed. Buildings or buildings made of color-coated steel sheets are often used for long periods of time when washed with rain. Otherwise, they are affected by the action of sulfur dioxide gas, salt and dust. Therefore, at the time of design, if the inclination of the roof is larger, the dirt is less likely to accumulate dirt and the like, and the service life is longer; for those areas or parts that are not washed frequently by rain, it should be washed regularly with water.

Introduction of galvanized steel coil parameters

Product Name Galvanized steel coil/ galvanized steel sheet
Material Steel
Type coil/sheet/strips
Thickness 0.12-0.3mm
Width 600-1200mm
Color White, blue, black, red or as per customer request
Grade Q/BQB440 JISG3312TDC51D CGCC ,TDC52D CGCD1 ,TDC53D
TS280GD CGC400, TS350GD CGC440,TS550GD CGC570SUS201, SUS304, SUS316, A2-70, A2-80, A4-80, 4.8 6.8 8.8 10.9 12.9
Standard AISI, ASTM, BS, DIN, GB, JIS
Trade Terms FOB/CNF/CIF
Payment Terms L/C,T/T
Delivery Time Within 15-30 days after we receive deposit

Main features of galvanized steel coil

  • (1)Anticorrosive

    13 years in heavy industrial areas, 50 years in the ocean, 104 years in the suburbs and 30 years in cities.

  • (2)Cheap

    The cost of hot-dip galvanizing is lower than that of other coatings.

  • (3)Reliable

    The zinc coating is metallurgically bonded to the steel and forms part of the steel surface, so the coating is more durable.

  • (4)Strong toughness

    The galvanized layer forms a special metallurgical structure that can withstand mechanical damage during transportation and use.

  • (5)Comprehensive protection

    Every part of the plated piece can be galvanized, and is fully protected even in depressions, sharp corners, and hidden places.

  • (6)Save time and energy

    Galvanizing process is faster than other coating methods.

Production Line

Production Process

Continuous hot-dip galvanizing of strip steel is a common process for galvanizing products, that is, the steel coils are connected, and after necessary pre-treatment and annealing, the strip steel is directly galvanized through a zinc pot having molten zinc liquid.

  • (1)Unwinding

    Unwinding the steel coil to provide the steel strip required for continuous operation, generally using two unwinders.

  • (2)Welding

    Welding the leading end of the strip and the strip of the trailing strip to ensure continuous production of the unit.

  • (3)Inlet looper

    Store a certain amount of steel strip, ensure the normal operation of the furnace section when the unit is shut down for welding. Commonly, there are two forms, horizontal and vertical.

  • (4)Cleaning

    Cleaning the strip surface to remove rolling oil and iron powder to obtain good coating adhesion and surface quality, generally including spraying, brushing, electrolytic cleaning, brushing, spraying, squeezing and hot air drying. And other equipment.

  • (5)Annealing

    Recrystallization annealing of the rolled strip is carried out to obtain good mechanical properties of the product. By controlling the atmosphere in the furnace, good strip coating performance is obtained. Generally, it consists of several sections such as preheating, heating, soaking and cooling.

  • (6)Galvanizing

    Immersion galvanizing or other metal plating on the strip. One or more zinc pots can be set according to the product category.

  • (7)Air knife zinc layer control

    The thickness of the coating on the surface of the strip is controlled by blowing gas onto the strip surface after the zinc pot.

  • (8)Alloying treatment

    Heating the strip steel after galvanizing to obtain a zinc-iron alloy plating process. It generally includes heating, holding and cooling processes.

  • (9)Air cooling after plating

    The air-sprayed steel strip is cooled by air blowing to ensure that the coating is cooled when it enters the top roll.

  • (10)Water quenching and cooling

    Further cooling the strip after stripping to ensure that the temperature of the strip before entering the flat meets the process requirements.

  • (11)Leveling

    Rolling the strip with small rolling force, eliminating the yield platform of low carbon steel, improving the strip performance, obtaining the desired strip surface roughness, improving the strip shape, and obtaining good flatness.

  • (12)Pulling

    Stretch straightening of the strip to further improve the form.

  • (13)Post-treatment

    Passivation or other chemical surface treatment of the strip to obtain the corrosion, lubrication or other requirements that the user desires. Spray squeezing or roller coating drying is generally used.

  • (14)Export looper

    Store the strip at the exit shear stop to ensure the normal operation of the unit’s process section. After the coiling, the high-speed operation is adopted, and the looper is evacuated.

  • (15)Trimming

    Trimming the strip as needed to achieve proper width accuracy.

  • (16)Quality inspection

    Surface quality inspection of strip steel.

  • (17)Oiling

    Oiling the strip steel to obtain certain rust and lubrication properties.

  • (18)Coiling

    Coiling the strip to obtain a coiled strip.

Galvanized steel coil production video

Product Package Details

Q: Are you trading company or manufacturer ?

A: We are factory.

Q: How long is your delivery time?

A: Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.

Q: Do you provide samples ? is it free or extra ?

A: Yes, we could offer the sample for free charge but do not pay the cost of freight.

Q: What is your terms of payment ?

A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shipment.
If you have another question, please feel free to contact us.

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