Abstract: The conventional vertical 2-roll extrusion system has such shortcomings as severe shortage of welding pressure of the vertical extrusion roll,"escape"of the edge of the blank pipe to be welded from the extrusion roll gap,and the spade-shaped butting of the blank edge,etc,Addressing such problems,the horizontal 2-roll extrusion system and related extrusion roll pass are proposed,and the advantages of both are discussed in terms of the structure,function and application.In a certain domestic company,the original vertical extrusion system is totally modified into a horizontal one.As a result,with the product mix little changed,the defective flatting-caused crack rate,the removal amount of inner/outer burr and power consumption per ton are all reduced,which means that the said horizontal 2-roll extrusion system is worth spreading up for application.