Gi sheet is highly favored in the fields of construction, manufacturing, and industrial processing due to its excellent anti-corrosion performance and mechanical strength. Among them, 2mm thick gi sheet is widely used in steel structure factories, automobile manufacturing, and home appliance casings due to its balance between strength and economy. However, its actual weight varies due to factors such as material density, process tolerances, and surface treatment. A standard 2 mm gi sheet has a theoretical weight of approximately 157 kilograms, but in practical engineering, a deviation range of ± 3% needs to be considered.

1. Theoretical calculation formula

The weight of 2 mm gi sheet can be derived through the formula of density and volume. The density of steel is about 7.85 grams per cubic centimeter, which is equivalent to 7850 kilograms per cubic meter when converted to kilograms per cubic meter. Assuming the size of gi sheet is 1 meter x 1 meter (i.e. 1 square meter), its volume is thickness x area=0.002 meters x 1 square meter=0.002 cubic meters. According to mass=density x volume, the theoretical weight is 7850 kilograms/cubic meter x 0.002 cubic meters=15.7 kilograms. Therefore, the weight of a single 2 mm gi sheet under standard size is approximately 15.7 kilograms.

2. Factors affecting actual weight

Theoretical calculations need to be adjusted based on actual production parameters. Firstly, the thickness of the galvanized layer will affect the total weight. The thickness of the zinc layer on ordinary hot-dip gi sheet is usually 20-60 microns. For every 10 microns of zinc layer added, the weight per square meter increases by about 0.0785 kilograms. Secondly, the edge treatment methods of the board (such as cutting edges and burrs) can lead to area errors, which in turn affect the weight. In addition, differences in alloy ratios used by different steel mills may lead to density fluctuations, with actual densities ranging from 7.8-7.9 grams per cubic centimeter.

3. Estimation methods in engineering applications

To simplify calculations, the industry commonly uses coefficient methods for estimation. For 2mm gi sheet, the reference value of 15.7 kilograms per square meter can be adjusted according to the actual size. For example, if you need to calculate the weight of a 3-meter x 1.5-meter board, first calculate the area of 4.5 square meters, and then multiply it by the unit weight: 4.5 x 15.7=70.65 kilograms. This method is suitable for fast estimation, but it is important to keep one decimal place to improve accuracy.

4. The correlation between material selection and cost control

During the material selection phase of the project, the weight of 2 mm gi sheet directly affects transportation costs and structural load-bearing capacity. For example, in the design of a steel structure factory building, if a single truss uses 200 square meters of gi sheet metal, calculated at 15.7 kilograms per square meter, the total weight reaches 3.14 tons, and a reasonable lifting plan needs to be planned. At the same time, weight data is also a key parameter for cost accounting. By multiplying the unit weight by the unit price (such as 5000 yuan/ton), material costs can be quickly obtained, providing a basis for project budgeting.
Based on industry data and technical standards, the weight calculation of 2 mm gi sheet needs to be adjusted according to specific application scenarios. For example, gi sheet with a 60 micron zinc layer can weigh up to 160.6 kilograms per square meter, and additional safety factors are required in low-temperature environments or special working conditions. In terms of the market, the average price of gi sheet coils in September 2025 is 4830 yuan/ton, and price fluctuations are significantly affected by supply and demand as well as raw material costs. In the future, with the increasing demand for lightweight and durability in the steel structure industry, weight control and process optimization of gi sheets will become key competitive points.