PREPAINTED GALVANIZED STEEL IN COIL System 1

PREPAINTED GALVANIZED STEEL IN COIL

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Product Description:

Specification

1. Thickness: 0.3-0.8mm

2. Width: 914-1250mm

3. Inner Diameter: 508mm

4. Weight of Steel Coil: 3-15MT

5. Available Dipped Layer: 50-150g/m²

6. Surface Texture: Normal Coated

7. Type of coating structure: 2/1 Coat the top surface of the steel sheet twice, coat the bottom surface once, and bake the sheet twice.

8. Front Side Paint Thickness: 15-25μm (bottom paint+top paint)

9. Back Side Paint Thickness: 5-10μm

Mechanical Properties

1. Mechanical properties of base metals

Grade	Tensile Test
Grade	Yield Strength MPa	Tensile Strength MPa	Elongation A80mm % ≥
SGCC	140-350	270-500	22
SGCD	140-300	270-420	26
SGCE	140-260	270-380	30

2. Common performance of front coating

(1). Thickness: ≥20μm

(2). Pencil Hardness: 2H

(3). 60° specular glossiness of coating: >60

(4). 180°bend: ≤3T

(5). Impact: ≥9J

(6). Salt Fog Resistant: ≥500h

(7). Color difference: <3ΔE

Q: How are steel coils inspected for surface quality?: Steel coils are inspected for surface quality through a meticulous process that involves various methods and technologies. The inspection is crucial as it ensures the coils meet the required standards and are free from any defects or imperfections. Here are the steps involved in inspecting steel coils for surface quality: 1. Visual Inspection: Initially, the coils undergo a visual inspection where trained personnel visually examine the entire surface for any visible defects such as scratches, dents, or any irregularities. This step helps identify any obvious issues that can be detected through visual observation. 2. Magnetic Particle Inspection: This non-destructive testing method involves applying a magnetic field to the steel coil's surface and then applying a magnetic particle solution. Any surface cracks or defects will cause the magnetic particles to cluster, making them visible under proper lighting. This technique is highly effective in detecting surface cracks and other surface abnormalities. 3. Eddy Current Testing: This method of inspection utilizes electromagnetic induction to identify surface defects. An eddy current probe is passed over the steel coil's surface, and any variations in the electrical current induced by the magnetic field will be detected. This technique is particularly useful for detecting surface cracks, pits, or corrosion on the coil's surface. 4. Ultrasonic Testing: Ultrasonic waves are used to inspect the steel coil's surface for any hidden defects such as subsurface cracks or inclusions. High-frequency sound waves are transmitted into the material, and any changes in the sound wave pattern that are reflected back indicate the presence of defects. Ultrasonic testing is highly reliable and can detect even the smallest defects within the steel coil. 5. Surface Roughness Measurement: The surface roughness of the steel coil is measured using specialized equipment. This measurement helps determine if the surface meets the required smoothness standards. The equipment scans the surface and provides detailed information about the roughness, enabling the inspector to ensure it falls within the acceptable range. Overall, steel coils undergo a comprehensive inspection process that combines visual examination with advanced testing methods such as magnetic particle inspection, eddy current testing, ultrasonic testing, and surface roughness measurement. These inspection techniques help identify and evaluate any potential defects or surface irregularities, ensuring that the steel coils meet the required surface quality standards.

Q: Are steel coils used in the packaging industry?: Yes, steel coils are commonly used in the packaging industry for various applications such as strapping, bundling, and securing heavy loads.

Q: How are steel coils used in the production of kitchen appliances?: Steel coils are used in the production of kitchen appliances as they are transformed into various components such as panels, doors, and frames. These coils are typically cut, shaped, and welded into desired forms, providing strength, durability, and a sleek finish to the appliances.

Q: How are steel coils used in the production of roofing materials?: Steel coils are used in the production of roofing materials as they are rolled out and cut into specific dimensions to create metal roofing sheets. These coils provide a sturdy and durable base material that is resistant to weather conditions, ensuring long-lasting and reliable roofing solutions.

Q: I am reading the book The Cure For All Advanced Cancers by Hulda Regehr Clark.She writes for example: cancer can be caused by exposure to heavy metals, like nickel and chromium from stainless steel cookware. Stainless steel cookware releases chromium and nickel, two of the most carcinogenic metals.Are there any studies done measuring how much nickel and cadmium can be released from the regular use of stainless steel cookware?Is this a commonly accepted opinion that use of stainless steel cookware is dangerous?If not stainless steel, what kind of cookware to use? I heard that non-stick cookware also releases some harmful chemicals.: perfluorooctanoic acid is a chemical used to make nonstick cookware. It has been shown to cause cancer in lab animals. The epa has asked companies that use that chemical to phase it out of the cookware, just in case. But it has not been shown to cause cancer in humans. Stainless is not known to cause any type of health problems. Cast iron is healthier and anodized aluminum is great too.

Q: How are steel coils processed before being used in manufacturing?: Steel coils undergo several processing steps before they are used in manufacturing. These steps typically include cleaning, pickling, cold rolling, annealing, and coating. Cleaning involves removing any dirt or impurities from the surface of the coil. Pickling is a chemical process that removes scale and oxides from the steel, enhancing its surface quality. Cold rolling reduces the thickness and improves the hardness of the steel. Annealing involves heating the coil and then slowly cooling it to enhance its ductility and reduce internal stresses. Lastly, coating is applied to protect the steel from corrosion or to enhance its appearance.

Q: What are the common coil storage methods?: The common coil storage methods include stacking in a vertical or horizontal position, using coil cradles or racks, and utilizing coil drums or shafts for secure storage.

Q: How are steel coils protected against UV radiation?: Steel coils are protected against UV radiation through the application of protective coatings or paints. These coatings act as a barrier, shielding the steel from direct exposure to UV rays, preventing oxidation and degradation of the metal.

Q: What are the different cutting methods for steel coils?: There are several different cutting methods that can be used for steel coils, depending on the specific requirements and desired outcome. Some of the most common cutting methods for steel coils include: 1. Slitting: Slitting is a method that involves cutting the steel coil into narrower strips. This is typically done using a slitting machine that features multiple circular blades. The machine will unwind the coil and pass it through the blades, which will cut it into the desired width. Slitting is commonly used for applications that require narrower strips of steel, such as in the manufacturing of automotive parts or electrical appliances. 2. Shearing: Shearing is a cutting method that involves using a shear machine to cut through the steel coil. The machine will have a straight blade that is pressed against the coil, effectively cutting it into desired lengths or shapes. Shearing is often used for applications that require precise cuts or when the steel coil needs to be cut into specific sizes. 3. Laser cutting: Laser cutting is a more advanced cutting method that uses a high-powered laser to cut through the steel coil. The laser beam is directed onto the coil, melting or vaporizing the metal and creating a clean and accurate cut. Laser cutting is highly precise and can be used to cut intricate designs or patterns into the steel coil. It is often used in industries such as aerospace, automotive, and electronics. 4. Plasma cutting: Plasma cutting is a cutting method that uses a high-velocity jet of ionized gas to melt and remove the metal from the steel coil. The gas is usually a mixture of oxygen and an inert gas, such as nitrogen or argon. Plasma cutting is known for its speed and versatility, as it can cut through a variety of metals, including steel. It is often used in industries that require fast and efficient cutting, such as shipbuilding or construction. These are just a few of the different cutting methods that can be used for steel coils. The choice of method will depend on factors such as the desired outcome, the thickness of the steel coil, and the specific requirements of the application. It is important to consult with a professional or specialist to determine the most suitable cutting method for your specific needs.

Q: How are steel coils used in the production of industrial tanks?: Steel coils are used in the production of industrial tanks as they are rolled and formed into the desired shape to create the tank's structure. The coils provide the necessary strength and durability required to withstand the pressure and weight of the tank's contents.

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