Q235B square steel tube theory weight calculation formulas are as follows:

1. Calculation method of Q235B square steel tube with unequal length and width

[(Length+width)*2/3.14-thickness]*thickness*0.02466*tube length=weight/piece

2. Calculation method of Q235B square steel tube theory weight of the same length

(Length+width)*2*7.85*tube length*thickness=weight/piece

3. Calculation method of Q235B seamless steel tube theory weight:

4 x wall thickness x (side length-wall thickness) x 7.85 *tube length = weight/piece

Note: the side length and wall thickness are in millimeters, and the values are substituted into the above formula directly to get the weight of the square tube per meter, in grams.

4. Weight calculation formula for Q235B aluminum square tube:

 The volume X density

5. The formula for calculating the weight of Q235B galvanized square tube:

(Length+width)*2*7.85*tube length*thickness*1.06=weight/piece

Note: 1.06 is the coefficient of zinc coating.