Cold rolled steel coil
Cold rolled steel coil is one of the most widely used industrial metal materials in global manufacturing, construction, automotive, home appliance, and packaging industries. For global buyers, importers, processors, and factory owners, cold rolled steel coil weight per coil and cold rolled steel coil diameter are two core parameters that directly affect production efficiency, processing cost, transportation safety, inventory management, and final product quality. In this professional guide, we will explain in detail the definition, calculation method, standard specification, application matching, and selection skills of cold rolled steel coil weight and coil diameter to help you make accurate purchasing decisions and avoid unnecessary losses in production and logistics.
First of all, we need to clarify the basic concepts of cold rolled steel coil weight and coil diameter. Coil weight refers to the total weight of a single roll of cold rolled steel coil, usually measured in metric tons (MT) or kilograms (kg). It is determined by thickness, width, length, material density and rolling process. Coil diameter includes inner diameter (ID) and outer diameter (OD), inner diameter is the diameter of the central hollow part of the steel coil, and outer diameter is the maximum diameter of the entire steel coil after rolling. These two parameters are not only the basis of product design, but also the key data for machine matching, container loading and workshop processing.
cold rolled steel coil
In international trade and actual production, the standard specifications of cold rolled steel coil weight and coil diameter have formed a unified system. The conventional inner diameter of cold rolled steel coil is mainly 508mm (20 inches) and 610mm (24 inches), which are compatible with most slitting machines, recoiling machines and uncoiling equipment in the world. The outer diameter is usually between 1000mm and 1800mm, which can be adjusted according to customer needs and production equipment capacity.
In terms of coil weight, conventional cold rolled steel coil weight ranges from 3 metric tons to 20 metric tons per coil, among which 5-15 MT is the most popular specification in the market, which takes into account the convenience of loading and unloading and the economy of mass production. Light small coils (3-8 MT) are suitable for small and medium-sized processing enterprises with limited workshop space and low equipment load; heavy large coils (10-20 MT) are more suitable for large-scale automated production lines, which can reduce the number of coil changes and improve production efficiency.
Many customers want to know how to calculate the theoretical weight of cold rolled steel coil to verify whether the supplier's quotation and delivery data are accurate. The most commonly used theoretical weight calculation formula for cold rolled steel coil is:Weight (kg) = Thickness (mm) × Width (m) × Length (m) × 7.85
Among them, 7.85 is the density value of carbon steel, unit is g/cm³. In addition, the coil weight can also be calculated by coil inner diameter, outer diameter and width:Weight (kg) = π/4 × (Outer Diameter² - Inner Diameter²) × Width (m) × 7.85
These two formulas are widely used in the steel industry, which can help customers quickly estimate the coil weight and avoid errors caused by inconsistent measurement standards. It should be noted that the actual weight of cold rolled steel coil will have a slight error with the theoretical weight, which is usually controlled within ±0.5% according to international standards, which is a normal range.
In terms of logistics and transportation, cold rolled steel coil weight and coil diameter directly determine the loading quantity and transportation cost of containers. 20-foot containers and 40-foot containers have different load limits and space sizes. Reasonably selecting coil weight and coil diameter can maximize the loading quantity, reduce the unit transportation cost and improve the overall economic benefit. For example, conventional 40-foot high containers can load about 25-28 metric tons of cold rolled steel coils. Choosing coils with appropriate weight and diameter can avoid space waste or overweight problems, and ensure the safety and smoothness of maritime transportation.
As a professional supplier of cold rolled steel coil, we often receive inquiries from customers about customized coil weight and coil diameter. In fact, most regular steel mills can provide customized services according to customer requirements, including adjusting inner diameter, controlling outer diameter, and customizing light or heavy coils. Customized cold rolled steel coil can better match the customer's production equipment and process flow, reduce the intermediate processing link, and save time and cost for the enterprise. Whether you are engaged in home appliance shell manufacturing, automotive parts processing, precision instrument production, or pipe making, color coating, galvanizing substrate processing, you can find the most suitable cold rolled steel coil specifications through customized parameters.
In addition to coil weight and coil diameter, the quality of cold rolled steel coil itself is also very important. High-quality cold rolled steel coil has smooth surface, no oxidation, no scratch, uniform thickness, stable mechanical properties, good stamping and bending performance, and is suitable for various deep processing. Common grades include SPCC, DC01, DC03, DC04, ST12, ST14, etc., which meet different international standards such as JIS, EN, ASTM, and can be sold worldwide. When purchasing cold rolled steel coil, customers should not only pay attention to coil weight and coil diameter parameters, but also comprehensively consider material grade, thickness tolerance, surface treatment, delivery status and other factors to ensure that the purchased products meet their production needs.
- Cold-rolled steel specification
|
Steel Grade |
Yield Strength (MPa) min |
Tensile Strength (MPa) min |
Elongation % min |
Old Description |
|
DC01 |
≤280 |
270-410 |
28 |
St 12-03 |
|
DC03 |
≤240 |
270-370 |
34 |
St 13-03 |
|
DC04 |
≤210 |
270-350 |
38 |
St 14-03 |
|
DC05 |
≤180 |
270-330 |
40 |
St 15-03 |
|
DC06 |
≤170 |
270-330 |
41 |
- |
|
DC07 |
≤150 |
250-310 |
44 |
- |
GNEE STEEL is a professional supplier of high-quality cold rolled steel coil, hot dipped galvanized steel coil, galvalume steel coil, color coated steel coil, corrugated steel sheet, and related steel processing products. We can provide standard and customized cold rolled steel coil with accurate coil weight and suitable coil diameter, with complete grades, stable quality, and preferential prices. If you have any needs for cold rolled steel coil or other steel products, please leave your inquiry, we will provide you with detailed quotation, specification list and professional solution at the first time!
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