Classification of rectangular steel pipe by section shape:

Simple section square pipe: square pipe, rectangular pipe.

Square pipe with complex section: flower-shaped square pipe, open-shaped square pipe, corrugated square pipe, special-shaped square pipe.

Classification of rectangular steel pipe by surface treatment 

By surface treatment square pipes are divided into: hot-dip galvanized square pipe, electro-galvanized square pipe, oil-coated square pipe, pickling square pipe.

Classification of rectangular steel pipe by usage:

Square pipes are classified by purpose: square pipes for decoration, square pipes for machine tools, square pipes for machinery industry, square pipes for chemical industry, square pipes for steel structures, square pipes for shipbuilding, square pipes for automobiles, square pipes for steel beams and columns , Special purpose square tube.

Rectangular pipe classification by wall thickness

Rectangular pipes are classified by wall thickness: ultra-thick-walled rectangular pipes, thick-walled rectangular pipes and thin-walled rectangular pipes.