Square tube weight calculation formula

Square tube weight calculation formula:

1. The calculation formula of the theoretical weight of the dealer's square tube: (side length + side length) * 2 * wall thickness * 0.00785 * length = weight of 1 piece
The weight calculated by this algorithm is generally much larger than the actual weighing weight.

2. The manufacturer's general algorithm is to directly calculate the weight of one strip based on knowing the actual material width * wall thickness * 0.00785 * length.

3. There is another commonly used algorithm: (side length + side length) * 2 = perimeter, (circumference/3.14-wall thickness) * wall thickness * 0.02466 * length = weight of 1 piece

For example: 40*40*2.5 square tube, length 6 meters, 100 pieces/piece.

The first algorithm: 40*4*2.5*0.00785*6=18.84kg*100 pieces=1.884 tons
The second algorithm: 150*2.5*0.00785*6=17.66 kg*100 pieces=1.766 tons
The third algorithm: (160*3.14-2.5)*2.5*0.02466*6=17.92 roots*100 roots=1.792 tons

Summary: 

Generally, the weight calculated by the first algorithm is too large, and dealers often use this method to measure and sell. The second method depends on the difference in wall thickness and diameter of the square tube. The width of the actual strip steel used for the square tube is not good. Confirm, so most square tube manufacturers generally use this algorithm; the third algorithm does not distinguish between wall thickness and caliber size, so it is generally used by those who sell by weighing. In reality, there is a certain tolerance range when the wall thickness meets the national standard. Therefore, the weight we calculate is generally larger than the actual weighing weight.

The calculation formula for the weight of round pipes is: (pipe diameter - wall thickness) × wall thickness × 0.02466 kg/m.

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