Discussion on 2-roll Rotary-rolling Pipe Mill

The rotary-rolling pipe mill is regarded as one of the two major pipe mill types commonly used domestically.Elaborated in the paper are the characteristics,the technological upgrade and the technical development trend of the pipe mill.Also discussed are such issues associated with the mill,including the guide disc and the guide shoe,the toe angle,the expanding process and the reducing process,and lubrication and cycling of the mandrel.At last the author presents a brief discussion on the feasibility for “ producing small-sized hot-rolled seamless steel pipes under Φ 60 mm with the 2-roll elongating mill” in a bid to improve the unreasonable domestic product mix of such pipes that is composed of “cold-rolled pipes instead of hot-rolled ones”.