How to distinguish the normal floating rust and rusting of seamless steel pipe

Seamless steel pipe is a qualified finished product through billet sawing, then heating, piercing, sizing, straightening, cooling, dramatic head and packing in the steel mill. As the seamless steel pipe is hollow in body, its volume is generally large and needs much room to keep stock. Thus the cost of indoor warehouses for seamless steel pipe will be too high. Therefore, most warehouses for seamless steel pipes are outdoor warehouses. When the seamless steel pipes are placed outdoors, they can't avoid the wind and sun.

The so-called floating rust, just as the name implies, is a layer of rust floating on the seamless steel pipe, which can be removed with a towel or other things. In short, floating rust is also rust free, which belongs to the normal state. The rusted seamless steel pipe has been placed for a long time, at least for more than one year, and has been exposed to the wind and sun outside. There are big and small pockmarks on the rusted seamless steel pipe, which is the biggest difference between floating rust and real rust of seamless steel pipe.