What is the best ERW pipe or seamless pipe?

The choice between ERW (Electric Resistance Welded) pipe and seamless pipe depends on the specific application and requirements. ERW pipes are typically more economical and suitable for low-pressure applications, while seamless pipes are stronger and better for high-pressure environments due to their lack of welds, which can be weak points. Seamless pipes are often preferred in critical applications like oil and gas, while ERW pipes are commonly used in construction and structural applications. Ultimately, the "best" option varies based on factors like cost, strength requirements, and intended use.