ROLLING METHOD OF ANGLE STEEL

摘要

PURPOSE:To suppress generation of roll wear and rolling flaws and to obtain an angle steel having an optional side and thickness with common rolls by adopting open pass type rolling and performing a series of rolling stages in combination of said rolling as well as 4-roll rolling and 3-roll rolling. CONSTITUTION:A slab-shaped blank material is rolled by a rough rolling type rolling mill A having an open pass P between upper and lower rolls 1 and 2 to obtain a rough shape material S0. The rolled material having an optional side length and thickness can be obtained by such open pass type rolling. The rolled material is repeatedly rolled by said rolling mill until the material is formed to a prescribed shape. The rolled material is formed down to near the product size by a rolling mill group provided with a 4-shaft rolling mill B and a 3-shaft rolling mill C or open pass type 2-shaft rolling mill in the succeeding intermediate rolling stage and is subjected to the final flange-end rolling by a 4-shaft rolling mill D. The thick material is preliminarily bent by a 2-shaft rolling mill E. The rolled material S is rolled by a 3-shaft rolling mill F and is finished in the next finish rolling stage.