To provide a brush-chamfering or a brush-burring device for a steel bar/steel pipe, and to provide a brush-chamfering or a brush-burring method.

In operation of the brush-burring device for a steel bar/steel pipe transferred on a transfer line, the workpiece to be machined is non-rotativelly fixed, and a brush is rotated in a direction perpendicular to or in parallel with a longitudinal direction of the workpiece. According to the structure of the brush-burring device, the brush itself of the brush-chamfering device is made rotatable. Further if the workpiece is the steel pipe, the amount of eccentricity of the brush can be adjusted depending on an external diameter and an internal diameter of the steel pipe. The brush-chamfering method is also disclosed.