Hot rolling process of wide flat bar steel

Abstract

The hot rolling process of wide flat bar steel includes the following steps: heating continuously cast rectangular steel billet at 1050-1150 deg.c inside heating furnace, coarse edge rolling in an edger, descaling in a descaling unit, repeated rolling in a two-roller reversing mill, cutting ends in a hot shearing machine, finish rolling in a finishing mil group, chilling to 475-525 deg.c in a water cooler, cooling to below 200 deg.c in a cooling bed, cutting ends in a cold shearing machine, lengthing in a shear gauge, shearing to certain length in a cold shearing machine, collecting and baling. The present invention provides wide flat bar steel in certain sizes for building and bridge.

Description

Technical field:

[0001] The invention relates to a rolling process of hot-rolled strip-shaped wide flat steel with a thickness of 6-25 mm, a width of 150-600 mm and a rectangular cross-section. It belongs to the technical field of steel production. Background technique:

[0002] Wide flat steel is mainly used for flange plates and webs of steel structures in buildings and bridges. The steel materials traditionally used for the flange and web are formed by shearing or flame-cutting steel plates and joining them. Therefore, the process is complicated, the consumption of steel is large, and the consumption of labor and auxiliary materials increases the production cost of steel structural parts. In addition, thin slabs produced by medium-sized rolling mills can also be used instead, but the largest width of thin slabs is only 280mm, which can only be used in small-sized steel structures, and the two sides are arc-shaped, making welding operations difficult. The resulting stee...

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