The mill comprises roll changing hydrocylinder (1), with rolling mill group (3), roll changer (2), post (4), worm wheel lifting gear (5), U-shaped frame (7), rotation ear (8) and bolt (9).

Al is tough-minded. He marshals history to make his argument, and countless examples of civilizations changing course and attitudes midstream roll off his tongue.

It tells the changing tendency of is contrary for work life of rolling stress and thermal stress roll rings under given assembly stress.