How to distinguish floating rust and rust of SSAW steel pipe?

SSAW steel pipes are typically not stocked in large quantities at production workshops before being delivered to users, so dealers often need to maintain some inventory. However, most dealers do not have large indoor warehouses, and instead, store their stock in outdoor areas. This exposes the spiral steel pipes to weather conditions, including wind and sun. Consequently, a common issue is distinguishing between floating rust and actual rust on the pipes.

Floating rust, as the term suggests, refers to a thin layer of rust that forms on the surface of the SSAW steel pipe. This rust can easily be removed with a towel or similar material. Essentially, floating rust is not considered a serious issue; it is a normal occurrence and can be wiped off without causing any long-term damage.

Actual rust, on the other hand, results from prolonged exposure to outdoor elements, typically over a period of one year or more. It causes the steel pipe to develop deeper rust pits, both large and small. This is the key difference between floating rust and true rust on spiral steel pipes: floating rust is superficial, while actual rust indicates a more significant deterioration of the pipe's surface.

In summary, the presence of floating rust is not a major concern and can be easily removed, while actual rust with pits indicates longer-term exposure and potential damage to the pipe.