The layout of large section steel and rail beam roll forging is a horizontal type, with the first column being a 2-roll reversible roughing mill, the second column being a 3-roll irreversible rolling mill and a 2-roll finishing mill.
The rough rolling frame rolls steel ingots into steel billets, with high rolling temperature and pressure. The roller body is processed with deep passes, reducing the effective load-bearing section of the roller. Therefore, it is required that the roller should have high strength and heat crack resistance. At the same time, due to the large cross-sectional size of raw materials and complex passes, it is also necessary to consider that the roller has good biting performance. Most large domestic factories use chromium molybdenum forged steel rolls or chromium nickel molybdenum cast steel rolls, with a hardness range of HS35-50.
When the roll pass is deep, the process of pre opening the pass and then conducting heat treatment on the finished product can be used to obtain a uniform structure on the side wall and bottom of the pass, which can significantly improve the wear resistance and thermal cracking resistance of the rough roll.
If the rough rolling stand has good east cooling conditions and the temperature of the rolling rolls can be controlled below 60 ℃, semi steel rough rolling rolls can be selected. Improving the alloying degree of cast steel rolls and adopting microalloying technology to further refine the matrix structure are the development directions of rough rolling rolls.
Link to this article：Selection of Rough Roll Materials for Large Section Steel and Rail Beam Rolling Mills
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