Cold Rolled Galvanized Steel Coil for Construction

Cold Rolled Galvanized Steel Coil for Construction

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Loading Port:: Tianjin

Payment Terms:: TT OR LC

Min Order Qty:: 25 m.t.

Supply Capability:: 10000 m.t./month

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Additional Info.

Trademark:STW

Packing:Sea Worthy Packing

Standard:0.2mm to 1.2mm

Origin:China

Production Capacity:10000 Tons Per Month

Product Description

Fit for world's standard (ASTM, JIS, EN)
Yeild strength: 235mpa to 550mpa
Width: From 600mm to 1250mm
Thickness: From 0.2mm to 1.2mm

Coating: AZ50, AZ100, AZ150

Other requirements fit for customer's demands

Cold Rolled Galvanized Steel Coil for Construction

FAQ

1.What's your MOQ?
25MT, it is for one container.
2.Do you have QC teams?
Yeah, sure, our QC team is very important, they will keep the quality control for our products.
3. What's your normal delivery time?
Our delivery time about 10-20days for standard sizes, if you have other requirements like hardness and width ,it is about 20-40days. But don't worry ,we also try our best for the delivery time ,because time longer and our cost is higher.
4.Are the products tested before shipping?
Yes, all of our PPGI and GI was qualified before shipping. We test every batch every day.

Q:What is the difference between galvanized and galvalume steel coils?: Both galvanized and galvalume steel coils have undergone a coating process to enhance their durability and resistance to corrosion. However, there are distinct differences between the two. Galvanized steel coils have a layer of zinc coating, which provides excellent corrosion resistance and protects the underlying steel from rust and other forms of deterioration. The zinc coating also acts as a barrier against moisture and prevents direct contact between the steel and the elements. Galvanized steel coils are commonly used in construction, automotive manufacturing, and agricultural equipment, where corrosion resistance is crucial. On the other hand, galvalume steel coils are coated with a combination of zinc and aluminum. This unique coating composition offers enhanced corrosion resistance compared to galvanized steel coils. The aluminum in the coating acts as a sacrificial anode, providing additional protection to the steel by sacrificially corroding instead. This sacrificial protection mechanism helps the underlying steel remain intact and prevents the spread of corrosion even if the coating is damaged. Galvalume steel coils are often used in environments with extreme weather conditions and high humidity, making them suitable for roofing, siding, and other outdoor applications. To summarize, the main difference between galvanized and galvalume steel coils lies in the composition of their coatings. Galvanized steel has a zinc coating, while galvalume steel has a combination of zinc and aluminum. Galvalume steel offers superior corrosion resistance due to the sacrificial protection provided by the aluminum in the coating. The choice between the two depends on the specific application and the level of corrosion resistance required.

Q:Molten steel changes to solid steel at its __________ point. Could you please fill in the blank? Thank you so much, it is greatly appreciated. I have been looking for the answer to this question for a long time, but I never understand what the websites are trying to say because I don't have that big of a vocabulary and don't know what they mean. I've seen things saying steel boiling point, steel melting point, and steel freezing point. I don't know what any of those mean, and they might be the answer. Please help me. Thank you.: just like a melting point of ice and the boiling point of water, there are different points where something is converted into another form. such as icewatersteam. it's always the same thing and it's a physical change, but just in a different form. molten steel changes to solid steel at it's freezing point. or solid point. i'm not sure how you would word that. but it would not be melting or boiling point. hope that helped.

Q:What are the different types of steel coil treatments?: There are several types of steel coil treatments, including pickling, oiling, and galvanizing. Pickling involves immersing the steel coil in an acid bath to remove impurities and scale, resulting in a clean surface. Oiling is the process of applying a thin film of oil to the coil to prevent corrosion during storage and transportation. Galvanizing is a treatment where a layer of zinc is applied to the steel coil, providing excellent protection against corrosion.

Q:Correct me if I am wrong, but steel is an alloy between iron and carbon. Does the carbon in the steel stops the iron from rusting or corroding? Also what is the difference between mild steel and stainless steel?: Mild steel is an alloy. It is the most common form of steel. Mild steel (a so-called carbon steel) is a general term for a range of low carbon (a maximum of about 0.3%) steels that have good strength and can be bent, worked or can be welded into an endless variety of shapes for uses from vehicles (like cars and ships) to building materials. The carbon does not stop the material rusting or corroding. In addition to iron, carbon, and chromium, modern stainless steel may also contain other elements, such as nickel, niobium, molybdenum, and titanium. Nickel, molybdenum, niobium, and chromium enhance the corrosion resistance of stainless steel. It is the addition of a minimum of 12% chromium to the steel that makes it resist rust, or stain 'less' than other types of steel. The chromium in the steel combines with oxygen in the atmosphere to form a thin, invisible layer of chrome-containing oxide, called the passive film. The sizes of chromium atoms and their oxides are similar, so they pack neatly together on the surface of the metal, forming a stable layer only a few atoms thick. If the metal is cut or scratched and the passive film is disrupted, more oxide will quickly form and recover the exposed surface, protecting it from oxidative corrosion.

Q:What are the common defects in steel coil surface finishes?: Common defects in steel coil surface finishes include scratches, pits, roll marks, stains, and unevenness. These defects can be caused by various factors such as improper handling, processing issues, or equipment malfunction. These surface defects affect the aesthetics and quality of the steel coil, making it unsuitable for certain applications or requiring additional processing to rectify the defects.

Q:What are the common surface treatments for galvanized steel coils?: Galvanized steel coils can undergo various surface treatments to improve their corrosion resistance and appearance. Passivation is one such treatment, where a protective material like zinc phosphate or chromate is applied to create a barrier against moisture and atmospheric elements. This also enhances the adhesion of subsequent coatings or paints. Another treatment is chromate coating, which involves applying a thin layer of chromate to the steel surface. This provides extra protection against corrosion and enhances the steel's appearance. Chromate coatings can be clear or colored, depending on the desired aesthetic. Oiling is a common treatment that involves applying a thin layer of oil to prevent rust and corrosion during storage and transportation. It also offers temporary protection against moisture and other environmental factors until the steel is further processed or used. These surface treatments are widely used to improve the performance, durability, and appearance of galvanized steel coils, ensuring they can withstand harsh conditions and maintain their quality over time.

Q:Are steel coils affected by temperature changes?: Yes, steel coils can be affected by temperature changes. Steel is a metal that expands when heated and contracts when cooled. This expansion and contraction can lead to changes in the dimensions and shape of steel coils. Additionally, extreme temperature variations can cause thermal stress, which may result in warping, cracking, or weakening of the steel coils. Therefore, temperature changes can have an impact on the performance and integrity of steel coils.

Q:What materials are used to make steel coils?: Steel coils are primarily made from a material called steel, which is an alloy composed mainly of iron and carbon. The specific type of steel used to make coils depends on the desired properties and applications. Generally, carbon steel is the most common type used, as it offers strength, durability, and versatility. Other alloying elements may be added to enhance certain properties or characteristics of the steel, such as manganese, silicon, nickel, or chromium. The production of steel coils involves melting down the raw materials, refining the molten steel, and then shaping it into coils using specialized equipment and processes.

Q:Can steel coils be stored in a humid environment?: Steel coils can be stored in a humid environment, but it is not ideal. Humidity can cause steel coils to rust and corrode, leading to potential damage or degradation of the steel. It is recommended to store steel coils in a dry and well-ventilated area to protect them from the negative effects of humidity.

Q:What are the different methods of forming steel coils into sheets?: There are several methods of forming steel coils into sheets, including hot rolling, cold rolling, and annealing. Hot rolling involves heating the steel coils and passing them through a series of rollers to reduce their thickness and shape them into sheets. Cold rolling, on the other hand, does not involve heating the coils and instead uses pressure to shape them into sheets, resulting in a smoother and more precise finish. Annealing is a process that involves heating the steel coils to a specific temperature and then slowly cooling them, which helps to relieve stress and improve the material's ductility before it is formed into sheets.

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