Corrosion-proof steel pipe refers to the steel pipeline that can be effectively prevented or slowed down by chemical or electrochemical reaction in the process of transportation and use of corrosion phenomena after anti-corrosion process processing. According to China's statistics, the annual domestic steel pipe corrosion direct economic loss of more than 280 billion, the current global annual loss of up to $ 500 billion due to steel pipe corrosion. Anti-corrosion steel pipe can effectively prevent or slow down corrosion to extend the service life of steel pipe and reduce the cost of steel pipe operation.
 
(1) seamless steel pipe manufacturing process can be divided into: hot-rolled (extrusion), cold-rolled (drawing), hot-expanded steel pipe the basic categories.
 
(2) welded pipe according to the manufacturing process can be divided into: straight seam welded steel pipe, spiral welded steel pipe, plate and coil butt welded steel pipe, welded pipe hot expanded steel pipe.
 
Anti-corrosion steel pipe according to the shape of the classification.
 
Steel pipe according to the shape can be divided into: round, square, rectangular, octagonal, hexagonal, D-shaped, pentagonal and other shaped steel pipe, complex section of steel pipe, double concave steel pipe, five plum-shaped steel pipe, conical steel pipe, corrugated steel pipe, melon-shaped steel pipe, double convex steel pipe, etc.
 
Anti-corrosion steel pipe classification by use.
 
Anti-corrosion steel pipe can be divided into: steel pipe for pipeline, steel pipe for thermal equipment, steel pipe for mechanical industry, steel pipe for petroleum, geological drilling, container steel pipe, steel pipe for chemical industry, special-purpose steel pipe, etc. by application.