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Process for producing t-bar steel and series of rolling devices

A process for producing T-bar steel which includes an intermediate rolling step, in which the web and flange of a T-shaped steel bar roughly formed into a T shape are rolled, and a finishing step, in which the T-shaped steel bar obtained in the intermediate rolling step is finish-rolled into the shape of a product. The intermediate rolling step comprises: a rolling step using a first universal roughing mill, wherein upper and lower horizontal rolls reduce the entire upper and lower surfaces of the web in the thickness direction; an edger rolling step in which the edge faces of the flange are reduced; and a rolling step using a second universal roughing mill, wherein upper and lower horizontal rolls, each having a roll surface that is the same width as the intended inner height of the web and also having a corner which is located on the web-tip side and has been processed into a shape that does not roll the web surface, are used to reduce the upper and lower sides of the web in the thickness direction, excluding an area near the tip. Simultaneously with this rolling, one of right and left vertical rolls is used to reduce the edge face of the web in the height direction of the web, while keeping the periphery of the vertical roll in contact with the horizontal rolls, while the other vertical roll is used to reduce the flange in the thickness direction thereof.