First, the weight calculation formula of stainless steel welded pipes
Stainless steel welded pipes have two pipe mouth shapes: square and rectangular pipes and round pipes. Here are two theoretical weight calculation formulas for stainless steel welded pipes:
1. Stainless steel round pipe: theoretical weight = (outer diameter-wall thickness) * wall thickness * 0.02491 * length. For example, for 304 material, the theoretical weight of a 3-meter 25-round pipe with a solid thickness of 1.0 is (25-1.0) * 1.0 * 0.02491 * 3 = 1.79 kg. In the formula, the units of outer diameter and wall thickness are millimeters (mm), the unit of length is meters (m), and the calculated weight unit is kilograms (kg).
2. Stainless steel square and rectangular pipe: theoretical weight = (pipe mouth circumference/3.14-wall thickness) * wall thickness * 0.02491 * length. For example, material 304, 40*10*1mm, length 6 meters/piece, the theoretical weight of each piece = (100/3.14-1)*1*0.02491*6=4.61kg. (Note: 0.02491 is a constant calculated based on the density of stainless steel) The weight calculated by this formula is the theoretical weight of the stainless steel welded pipe. When the tolerance of the outer diameter and wall thickness of the steel pipe is very small, the difference from the actual weight is not large. Therefore, when purchasing stainless steel welded pipes, only large-volume transactions need to use actual weighing.

Second, matters needing attention in calculating the weight of stainless steel welded pipes.
1. The weight of stainless steel welded pipes is related to factors such as outer diameter, wall thickness, and length. The weight of stainless steel welded pipes of different specifications will also be different.
2. Pay attention to the grade and material of stainless steel welded pipes. The weight of welded pipes of different grades and materials will also be different.
3. The specifications of stainless steel welded pipes are related to the use environment. When choosing the specifications of stainless steel welded pipes, it is necessary to comprehensively consider factors such as the use environment and the occasion of use.
4. Considering factors such as energy saving and emission reduction, when choosing stainless steel welded pipes, factors such as surface treatment and durability also need to be considered.
5. According to national standards, the length of welded steel pipes is generally 6 meters, but there are also other specifications for welded steel pipes. When calculating the weight, it is necessary to calculate according to the actual length.
6. Do not use welded steel pipes that are too long or too short. Welded steel pipes that are too long can easily lead to transportation difficulties, and welded steel pipes that are too short may cause processing waste.

In short, when calculating the weight of stainless steel welded pipes, it is necessary to pay attention to the comprehensive influence of various factors and choose the appropriate specifications to give full play to their use effect.