The difference in weight between carbon steel pipes and stainless steel pipes is mainly affected by two factors: their respective density and the size of the pipe.

Specifically, the density of carbon steel tubes is about 7.85 grams per cubic centimeter, while the density of stainless steel tubes is slightly higher, about 7.93 grams per cubic centimeter. This slight density difference results in stainless steel tubes weighing slightly more than carbon steel tubes at the same size. However, this increase in weight is very small and tends not to have a significant impact on usage in practical applications, so in most cases the difference can be ignored.

However, when we consider the weight of the two pipes, it must be noted that if the two pipes compared are different in size, then their weight will also be different accordingly. Therefore, when making weight comparisons, it is very important to ensure that the pipes being compared have the same dimensions in order to obtain accurate comparison results.

To sum up, although in theory, the weight of stainless steel tubes will be slightly higher than that of carbon steel tubes, this difference is often insignificant in practical engineering applications. In the selection of suitable pipe materials, in addition to considering the weight, should also consider other important performance indicators, such as the corrosion resistance of the material, mechanical strength and cost and other factors. These factors are often more critical in determining which type of pipe is best suited for a particular application.