Out-of-roundness for performance of steel pipe

Talking about steel pipe’s performance, we would think about alloy in steel pipe, diameter, installment environment and so on. Actually, no matter which kind of steel pipe, from seamless steel pipe, ERW steel pipe to galvanized steel pipe, out-of-roundness is also an important part. We can see that machines would produce steel pipe with the character of round or cylindrical components. It is the function of an engineering project to determine and specify how they looked. Of course, due to roundness contributes to function and performance in many ways, we would take roundness finally. Here is the formula for out-of-roundness: From the picture, we can have a computation by ourselves. For example, the ERW steel pipe we sold, its Out Diameter from 21.3mm - 610mm. Thus, we can figure out the out of roundness immediately.