The operation principle for step by step rolling mill with segment rollers was introduced briefly, The function of the parts, technical performance, application features of the step by step rolling mill with type СШ 175M, МК 600, СШС 750 and the microstructure, properties of the rolled bars were described.

Research on drawability of AZ31 magnesium alloy sheet processed by differential speed rolling at room temperature;

Microstructure of AZ31 magnesium alloy sheets processed by differential speed rolling;

The objective of this study on microstructure and grain orientation of AZ31 magnesium alloy sheets produced by differential speed rolling was to investigate the possibility of improving deformability of AZ31 magnesium alloy sheets.

It is revealed that the cold rolling texture is composed of strong incomplete α(〈110〉∥RD) fiber and relatively weak complete γ fiber(〈111〉∥ND) no matter what rolling schedule is taken on,but asymmetric rolling affects greatly the textural strength and its distribution along thickness.

By means of analyzing four high mill for its rolling torque,this paper has established a structrural modle that suit to calculate the rolling torque of cold strip mill drived through back-up rolls in asymmetric rolling.

This paper is to research the thickness distribution across the strip and it's re-lationship with roll's thermal crown in asymmetric rolling.

Application and development of synchronous rolling with multi-wedge cross wedge rolling;