H Beam

The first production process is to use traditional steel ingot as raw material. First, the ingot is rolled into rectangular billets or billets on the blooming mill, and then these rectangular billets or billets are heated and sent to the billet cutter for rolling. There are two different pass systems, namely closed pass and open pass. In closed pass, the material deformation is uniform, but this requires more pass number and longer roll length, for this reason, closed pass is widely used in the production of medium section steel; The open pass is mainly used in the production of large section steel with larger waist width and leg width. If you want to use the closed pass rolling large section steel, you need two preforming machines in order to achieve satisfactory results in technology.

The second production process is to adopt continuous casting rectangular billet. The difference between it and the first production process is that no blooming mill is required, and the second process can produce H-beam steel with higher yield, better finished product quality and better economic benefits than the first process. The only limitation of this process is the wide leg of the H-beam steel produced, because the thickness of the billet used is limited by the equipment conditions of the continuous casting machine. The rolling process of continuous casting billet in the section steel plant is the same as the first kind.

The third production process is the use of continuous casting special-shaped billet. Its advantage is that the use of one or a small number of continuous casting special-shaped billets can produce the full size of H-beam steel, which can be achieved by using the wide spread method on the billet machine, and its pass can be closed or open. Compared with the first two processes, this production process has a smaller number of passes. The shortcoming of this process is limited by the leg width of the special-shaped billet. The rolling process after billet opening is the same as the first two methods, which needs to be formed by universal roughing mill and universal finishing mill.

The fourth production process is the use of continuous casting slab. It is more economical to produce H-beam steel by using continuous casting slab as raw material than by using primary rolling slab and continuous casting special-shaped slab, but it needs to design a special pass on the billet. This pass is similar to the pass of a rolled rail, which is a cut wedge with a certain Angle to roll the slab to form a shaped section similar to a “dog bone”. For this purpose, the slab is first rolled vertically in the first hole to form the desired leg width, and then rolled into the next shaped hole (open or closed holes can be) to resemble a “dog bone” shaped blank. This production process is more uniform than the first three kinds of deformation, and its advantage is that only one billet machine plus universal roughing mill and universal finishing mill can produce large H-beam steel. There is also a transformation process in the preforming machine, that is, the preforming machine uses a universal slab preforming machine, and the side pressure formed by the horizontal roll and the vertical roll at a certain Angle can be directly rolled out the shaped section of “dog bone”. The latter process is the same as the first process.

The fifth production process is to use a very thin waist thickness of continuous casting shaped billet as raw material. This thin continuous casting special-shaped billet is close to the finished H-shape steel size, so it can be roughed and finished directly on the universal unit, without the need for a billet machine. In this case, the direction of increasing production is to require the continuous casting machine to have a higher casting speed and can cast a thinner shaped section. Its rolling feature is that the deformation of the whole rolling process is more uniform.