Screw-thread steel rolling production line and production method thereof

Abstract

The invention relates to a screw-thread steel rolling production line, which comprises a roughing mill set, an intermediate mill set, a pre-water-cooling device and a finishing mill set, which are sequentially arranged in the rolled piece running direction. The intermediate mill set comprises a slitting rolling section which is a middle section of the intermediate mill set. The slitting rolling section comprises at least one roller with a slitting rolling pass, and two flying shears before finish rolling are arranged between the intermediate mill set and the finishing mill set side by side. According to the screw-thread steel rolling production line, the slitting rolling section is arranged in the intermediate mill set, that is, slitting rolling of screw-thread steel is completed in the intermediate rolling process; the two slit screw-thread steel bars are cooled through the pre-water-cooling device and then enter the finishing mill set for rolling, and screw-thread steel controlled rolling can be achieved in a true sense; and the slitting rolling section is arranged in the middle section of the intermediate mill set, and after slitting rolling, a rolled piece is rolled by a plurality of subsequent intermediate rolling mills and a plurality of finishing mills, so that the size precision of the rolled piece can be effectively controlled.

Description

Technical field [0001] The invention belongs to the technical field of metallurgy, and specifically relates to a threaded steel rolling production line and a production method thereof. Background technique [0002] At present, in the conventional hot-rolled rebar production lines, most of them adopt the production process of split rolling to increase the output of small-size rebar. Such as figure 1 , The layout of the rolling mill area of ​​the conventional rebar rolling production line is: roughing unit 1 (6 roughing mills) + intermediate rolling unit 2 (6 intermediate rolling mills) + pre-water cooling device 3 + a flying shear before finishing rolling 4 + finishing rolling Unit 5 (6 finishing mills) + water cooling device (not shown). Among them, 6 rough rolling mills and 6 intermediate rolling mills are arranged alternately, and the finishing mills are arranged 13H-14V-15H-16H / V-17H-18H / V. (H stands for horizontal rolling mill, V stands for vertical rolling mill, and H / V st...

AI Technical Summary

Problems solved by technology

After split rolling, the general rolled piece will have a large temperature rise, and there is no water cooling device to control the temperature of the rolled piece after split rolling, so the finishing rolling temperature of the rolled piece in the finishing rolling unit 5 is relatively high. It is about 900°C, and the controlled rolling has not been realized, and the real controlled rolling process cannot be realized.

Therefore, the quality of the rebar produced by the conventional rebar production line is not high. If it is necessary to produce high-quality rebar, a large amount of alloying elements must be added

[0004] (2) After slit rolling, the dimensional accuracy of the rolled piece is low, but it is only rolled by two 17H-18H / V rolling mills, so it is difficult to effectively control the precision of the slit rolled steel bar, which is not conducive to the realization of product accuracy control

Images