WC particle reinforced Fe-C matrix recycled composites roll collar were fabricated with remelting recycled waste composite roll collar materials by centrifugal casting.Effects of different sliding velocities on wear and frictional behavior of the recycled composite collar were investigated with the help of MMS-1G high speed pin-disk frictional and wear testing machine and SEM（scanning electron microscope） at 100 N

150 N

200 N loads.The results show that with the increase of sliding speed

the wear rate of recycled composite layer appears small fluctuations

and the friction coefficient is decreased firstly and then increased slowly at 100 N

150 N and 200 N.At a fixed sliding speed

wear rate is increased and frictional coefficient is decreased with the increase of load.Wear mechanisms of recycled composites roll collar are mainly characterized by plowing wear and plastic formation at low speed

while with the high speed

it is characterized mainly by abrasive wear

adhesion wear and oxidative wear.