What is a Steel Coil? Understanding Its Roles, Types, and Applications
Steel coil is a common metal in industrial applications, it has a very important role, although we can often see it in daily life, but do you know what steel coil is? Today's article will introduce you to what it is, what it does, and what types are available in the application.
What is a Steel Coil?
In fact, steel coil is a steel plate that is rolled into a cylindrical shape after hot rolling or cold rolling, and the outside is usually coated with steel strip or anti-rust film. This material has a fixed width and a length of several hundred meters, which is particularly convenient for transportation and storage, and can be widely used in the manufacturing industry. According to the processing technology, there are hot-rolled steel coils with rough surfaces, which are commonly used in the construction and machinery industries; There are also cold-rolled steel coils with higher precision, which are mainly used in automobiles and home appliances. If it is divided according to the material, it also includes galvanized coils and stainless steel coils. Steel coils can be processed into steel plates of the required size through processes such as leveling and shearing, which are indispensable basic materials in fields such as steel structure, automobile manufacturing, and home appliance production.
Common Types of Steel Coils And Applications
1. Hot rolled steel coils
The steel made by high-temperature rolling has good strength and plasticity, but the surface of the product is relatively rough. The use cost is low, can meet the needs of heavy structures, and is widely used in building steel structures, bridges, pipelines, etc.
It is formed by further cold rolling on the basis of hot rolling, which has a smoother surface and higher dimensional accuracy. It is characterized by high strength and can meet the needs of precision machining, and is commonly used in home appliance shells, automotive panels, and compact mechanical parts manufacturing.
A layer of zinc is applied to the surface of the steel coil, which greatly improves the rust and corrosion resistance. It has a long service life and can meet the long-term use of outdoor environments, mainly used in roofing, ventilation ducts, body manufacturing and other fields.
4. Stainless steel coils
Contains alloying elements such as chromium and nickel, and has excellent corrosion resistance and aesthetics. It can be used in high-temperature environments and is easy to clean, and is widely used in food processing equipment, medical equipment, chemical containers, construction installations, and other fields.
5. Color-coated steel coil
Coloured coating on a galvanized or cold-rolled steel coil base for both corrosion protection and decorative functions. It can be painted in a variety of colors, and it is very durable, and is usually used in building exterior walls, interior decoration, etc.
How are steel coils measured?
Steel coil measurement is a key link in ensuring product quality and fair transactions, and requires systematic operation through professional tools and methods: when measuring the outer diameter, you can use the π ruler or three-point measurement method, and avoid the label part to take the average value; when measuring the inner diameter, use an inside diameter gauge or digital caliper for multi-point detection; the width measurement needs to be completed at both ends and the middle position with a large vernier caliper or laser rangefinder, and pay attention to checking the edge quality.
When measuring the thickness of the steel coil, samples should be taken at multiple points at the head and tail sections (≥1m from the end), the sides (50mm from the edge) and the middle. Micrometers (accuracy ±0.001mm) or ultrasonic thickness gauges can be used, and the maximum value, minimum value and difference with the same plate should be recorded at the same time.
The weight of the steel coil can be calculated by theoretical formula (taking into account the diameter, width and steel density of 7.85g/cm³) or actual weighing (floor scale/crane scale), and the deviation is allowed to be ±1% to ±3% depending on the product type. If special parameters such as coil shape need to be tested, the pyramid shape (ruler to measure the end face deviation) and ovality need to be tested, and the surface quality needs to be visually inspected under 500lux light or using a roughness meter.
Measuring equipment should be calibrated regularly (micrometer every three months), and precision measurements should be performed in an environment of 20±2℃. A complete record system including measurement personnel, time, equipment and original data should be established. The error should be controlled within 0.05mm through standardized processes. Automated measurement systems are recommended for high-precision scenarios.
Guide to Efficiently Procuring Quality Steel Coils through Shineyond Group
As a key raw material in the fields of construction, automobile and machinery manufacturing, the purchase of steel coils requires comprehensive consideration of factors such as material, specification, surface treatment and mechanical properties. As a professional steel supplier, Shineyond Group mainly provides a full range of products such as hot-rolled, cold-rolled, galvanized, color-coated and stainless steel coils. The procurement process is simple and efficient: you can get a customized quotation by contacting us to confirm the material specifications, clarify the quality, packaging and payment terms when signing the contract, provide test reports in the production stage to ensure the pass rate, rely on the global logistics network to arrange sea/rail/road transportation and track in real time, and enjoy professional after-sales service after arrival and acceptance. Shineyond Group supports special specification customization and is equipped with a professional technical team to provide material selection suggestions to help you obtain high-quality steel coils with the best solution. Please contact the sales team for a one-stop procurement solution.
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