Roller device and process for continuous casting round billet rolling in two-roller reversing mill

Abstract

The invention discloses a two-roller reversible mill roller device and technology using continuous casting round billets for carrying out rolling production. Four types of hole patterns including a transition hole pattern, a supporting hole pattern, a before-finished-product hole pattern and a finished product hole pattern are designed on a pair of rollers. The rolling technology comprises the steps of using the transition hole pattern (1) for rolling the continuous casting round billets, and turning over steel after rolling is accomplished, wherein the rolling reduction ranges from 40 mm to 90 mm per pass; using the supporting hole pattern for continuously rolling the drum-shaped rolled pieces obtained in the previous step to obtain rectangular or square rolled pieces which have regular shapes, and turning over the steel after rolling is accomplished, wherein the rolling reduction ranges from 40 mm 90 mm per pass; using the before-finished-product hole pattern (3) for rolling the rolled pieces to obtain rectangular or oval rolled pieces with reserved rolling reduction and reserved broadening quantity, and turning over the steel billets after rolling is accomplished, wherein the rolling reduction ranges from 20 mm to 90 mm per pass; using the finished product hole pattern for rolling one pass to obtain rolled pieces which are high in dimensional accuracy and product quality, wherein the rolling reduction of square or rectangular steel finished products ranges from 40 mm to 60 mm per pass, and the nominal rolling reduction of round steel ranges from 10 mm to 40 mm per pass.

Description

technical field [0001] The invention relates to the technical field of steel rolling process, in particular to a roll device and process produced by rolling a continuous casting round billet in a two-roll reversing rolling mill. Background technique [0002] Two-roll reversible rolling mills generally use steel ingots and continuous casting billets to produce large-size square and round steel. The production of steel ingots has problems such as low production efficiency, large quality differences, high energy consumption and high production costs. Due to the limitation of the continuous casting radius of the continuous casting machine, billets The size is limited, the compression ratio cannot meet the requirements, and corner cracks and component segregation are prone to occur due to uneven cooling during the production process. The above-mentioned problems can be solved by rolling large-section continuous casting round billets. Therefore, large-scale square and round steel ...

AI Technical Summary

Problems solved by technology

[0002] Two-roll reversible rolling mills generally use steel ingots and continuous casting billets to produce large-size square and round steel. The production of steel ingots has problems such as low production efficiency, large quality differences, high energy consumption and high production costs. Due to the limitation of the continuous casting radius of the continuous casting machine, billets The size is limited, the compression ratio cannot meet the requirements, and corner cracks and component segregation are prone to occur due to uneven cooling during the production process

[0003] However, after the large-scale continuous casting round billet is rolled, the cross-sectional shape of the rolled piece is in the shape of a "drum" (such as figure 1 As shown), the end area of ​​the rolled piece is wider than the middle part, showing a "shovel" shape. After turning over, rolling on the two-roll reversing rolling mill is prone to falling off the square or even falling off the steel, which greatly affects the yield. Due to the problem of pass design in some steel mills, the yield is less than 40%.

However, in order to prevent the rolling parts from falling out and falling steel, the current pass design generally adopts the method of reducing the amount of reduction in the pass, and this leads to insufficient deformation of the coarse as-cast structure, which affects the grain size of the product. and organizational structure, ultimately making the quality of the product unable to be guaranteed

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