Weight Calculation for Rectangular Tubes

Rectangular tube is a kind of hollow long steel, also known as flat tube, flat square tube or square flat tube. A large number of pipes are used for conveying fluids, such as oil, natural gas, water, gas, steam, etc.; in addition, when the bending and torsional strength are the same, the weight is lighter, so it is also widely used in the manufacture of mechanical parts and engineering structures and production Various conventional weapons, barrels, shells, etc.

Rectangular pipes are a common variety in pipes. Its weight calculation formula is:

Weight=density×volume=density×(cross-sectional area×length), namely: m=ρ×V=ρ×(F×L)

To adjust the weight, the most important thing is to calculate the size of the cross-sectional area.

The cross-sectional shapes of square and rectangular tubes are divided into two types: rounded and right-angled. In the specific adjustment, the R angle of the rounded tube is usually ignored.

Cross section calculation formula:

Square tubes	F=4×(a-d)×d	a = length or side length b=width, d=thickness
Rectangular tubes	F=2×(a+b-2d)×d

Carefully look at the calculation formula, and with a little imagination, you can know that this is calculated by cutting and flattening the section square and moment ring into a slender rectangle. In fact, other profiles, such as I-beam, H-beam, etc., can also be easily adjusted using this idea.

For example: a rectangular steel pipe with a size of 50mm×20mm×3mm, one 6 meters, what is the weight?

Weight calculation: m=2×(50+20-2×3)×3×6000×0.00000785=18.0864(kg)

Classification of rectangular tubes:

Steel pipes are divided into seamless steel pipes and welded steel pipes (seamed pipes), such as hot-rolled seamless rectangular tubes, cold-drawn seamless  rectangular tubes, extruded seamless rectangular tubes, and welded  rectangular tubes. The welded square tube is divided into:

1. According to the process, it is divided into arc welded rectangular tube, resistance welded rectangular tube (high frequency, low frequency), gas welded rectangular tube, furnace welded rectangular tube;

2. According to the welding seam, it is divided into straight seam welded rectangular tube and spiral welded rectangular tube.

The use of rectangular tube:

Construction, machinery manufacturing, steel construction projects, shipbuilding, solar power brackets, steel structure engineering, power engineering, factories, agricultural and chemical machinery, glass curtain walls, automobile chassis, airports, etc.

Matters needing attention: The utilization rate of Q345 seamless rectangular tube is very high, but the general construction party should do a visual inspection of the pipes, pipe fittings, rubber rings, etc. before construction, and abandon the use if any problems are found.