The size

microstructure and hardness at different deformation sections of TA18tubes（Φ25mm×5 mm）after two-roll cold-rolling processing were investigated.The experimental results show that microstructure of TA18 alloy tubes is changed from annealing state into rolling state

and the morphology of grains is transformed into fibrous shape from equiaxed shape after cold rolling.The concentrated plastic deformation occurs in the reduction period

resulting in the severe working hardening of the tubes

so hardness of the tubes is increased from 222HV1 to 267HV1.Through reducing the empty size

the wall quality of tubes can be improved effectively.