Squares and rectangles (rectangular) cross-section of carbon steel pipe:
Weight per meter unit: kg / m (kg / m) & lb / ft (lb / ft)
Rectangular pipe commonly used to facilitate a calculation formula:
(Length width) × 2 ÷ 3.14-thickness × thickness × 0.02466 = kg / m
kg / m = (Oc - 4Wt) * Wt * 0.00785
Oc is the pipe outside the perimeter, Wt is the pipe wall thickness;
Oc = 4 * a square
Rectangular Oc = 2a 2b a, b is the side length
Popular explanation is: 4x thickness x (side - wall thickness) x7.85
Among them, the square tube side and wall thickness are in millimeters directly to the values into the above formula, obtained is the weight per meter square tube, in grams.
If 30x30x2.5 mm square tube, according to the formula to calculate the weight per meter:
4x2.5x (30-2.5) x7.85 = 275x7.85 = 2158.75 grams, or about 2.16 kg
When the wall thickness and the side units are in mm, 4x thickness x (side - wall thickness) is calculated per meter length of the square tube volume, in cubic centimeters as a unit, multiplied by the proportion of iron per cubic centimeter 7.85 grams obtained per meter square tube is the unit weight in grams.