The first
SM490YBH section steel production process uses traditional steel ingots as raw materials. First, the steel ingots are rolled into rectangular billets or billets on the blooming mill, and then these rectangular billets or billets are heated and sent to the billet mill for rolling. The billeting machine has two different pass system, namely closed pass and open pass. In the closed pass, the material is deformed uniformly, but this requires a larger number of passes and a longer roll body length. For this reason, the closed pass is widely used in the production of medium section steel; while the open pass The pass type is mainly used to produce large section steel with larger waist width and leg width. If you want to use closed-end pass rolling to roll large section steel, you need two billeting machines to achieve technically satisfactory results.
The rolling of the horizontal roll of the universal rolling mill and the side pressure of the vertical roll further reduce the waist thickness of the special-shaped billet and the legs become more pointed and flat. Usually the compression of the leg thickness is greater than the compression of the waist thickness. This can be explained by the contact length of the rolling piece and the roll in the roll deformation zone, because the contact length of the driven vertical roll and the rolling piece is longer than the contact length of the horizontal roll and the rolling piece. . In the universal finishing stand, the rolled piece is subjected to small compression by the horizontal and vertical rolls, and the leg ends are corrected by the edge rolling machine.
The second
SM490YBH section steel production process uses continuous casting rectangular billets. It differs from the first production process in that it does not require a blooming mill, and the second process can produce H-beams with a higher yield, better finished product quality and better economy than the first process. benefit. The only limitation of this process is that the produced H-shaped steel legs are wider, because the thickness of the continuous casting billet used is limited by the equipment conditions of the continuous casting machine. The rolling process of the continuous casting billet in the section steel plant is the same as that of the first type.
