Apparatus and method for hot strip rolling

Abstract

The invention relates to a method and a device for hot rolling strip (S), wherein the device has a hot rolling line (2) comprising a plurality of rolling stands (F1 to F7), the strip to be hot rolled ( S) passing through a plurality of rolling mill stands (F1 to F7) successively along the conveying direction (F), and the device has a cooling section (5) for The hot-rolled strip (S) leaving the rolling stand (F7) is intensively cooled. With the aid of the invention, it is possible on the basis of such conventional hot-rolling installations to produce in an operationally reliable manner hot-rolled strip having a final thickness of more than 15 mm, which satisfies even the most stringent requirements for the toughness of the hot-rolled strip. requirements. The device and method according to the invention are characterized in that the start of the cooling section (5) is offset to the end of the hot rolling line (2) seen in the conveying direction (F) of the strip (S) to be hot rolled section; and the cooling section (5) starts after the last rolling stand (F5) which is traversed before entering the cooling section (5), in each case the strip to be hot rolled (S) is hot rolled.

Description

technical field [0001] The invention relates to a device and method for hot rolling steel strip. Background technique [0002] A hot strip installation of the type referred to here generally comprises: a hot rolling line, which includes a plurality of rolling mill stands, through which the strip to be hot rolled passes successively along the conveying direction; The hot strip leaving the last rolling stand of the rolling line undergoes intensive cooling. [0003] Devices and methods of the type according to the invention are used for rolling so-called "slabs" having a thickness of at least 15 mm. In the conventional production of such thick strips, the individual strips are thermomechanically rolled in a four-high rolling mill in a reversible manner. However, this rolling operation lasts much longer than hot rolling in a hot rolling mill. Therefore, it is desirable to hot roll thick strips still in conventional hot rolling installations. [0004] The rolling of flat stee...

AI Technical Summary

Problems solved by technology

[0007] Practical experience has shown that although methods known in practice can be used to produce thick hot-rolled strip with increased strength, even if the measures required for the temperature control required in each case exist in the prior art (for those with considerable in various cases of complexity), these hot-rolled strips do not meet the requirements set in terms of toughness in the field of pipeline construction with the required reliability

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