Equipment and method for eliminating edge black line defect of large-width steel rolled material

Abstract

The invention provides equipment and a method for eliminating the edge black line defect of a large-width steel rolled material. The equipment comprises two opposite wide-face copper plates and two opposite narrow-face copper plates; the connection portions of the wide-face copper plates and the corresponding narrow-face copper plates are two continuous chamfers, each of which comprises a first crystallizer chamfer and a second crystallizer chamfer; and on the inner side of a crystallizer, an included angle between a first chamfer hot surface of each narrow-face copper plate and the corresponding wide-face copper plate is 155-165 degrees, and an included angle between a second chamfer hot surface of each narrow-face copper plate and the first chamfer hot surface of the corresponding narrow-face copper plate is 155-165 degrees. By utilizing the crystallizer and the method provided by the invention, a casting billet with a large-thickness chamfer surface can be produced, the corners of the casting billet during biting of each pass can be kept in a form of an obtuse angle at the whole broadening rolling stage, and the edge black line defect is not liable to occur on the rolled material.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular, the invention relates to a device and a method for eliminating black line defects at the edges of rolled large-width steel plates. Background technique [0002] In order to reduce the production cost and improve the quality of the slab, the width of the continuous casting slab produced by the domestic continuous casting machine is generally less than 2500mm. To the rotating track, rotate the slab 90° so that the longitudinal axis of the slab is parallel to the roll, and then carry out widening and rolling along the width direction of the slab to roll the slab into an intermediate billet that meets the width requirements of the finished product, and then Rotate the intermediate billet by 90° on the rotating track so that the longitudinal axis of the intermediate billet is perpendicular to the roll, and then carry out thinning rolling along the length direction ...

AI Technical Summary

Problems solved by technology

If the casting slab is directly cast into a shape with smooth arcs at the corners in the crystallizer, the inner surface of the narrow copper plate must be made into a smooth arc shape and the arc surface is tangent to the wide copper plate. The design of this scheme brings about a problem: since the curved part of the narrow face is tangent to the copper plate of the wide face, there is a sharp tangent angle at the narrow face copper plate at the intersecting position

However, in the prior art published at present, in order to reduce the processing cost of the chamfering mold and improve the adjustment accuracy of the taper in the direction of the wide surface, the width and thickness of the chamfering surface are set below 30mm. How to produce a large thickness Defect-free slabs with chamfered faces, which the prior art does not provide

Moreover, compared with the shape with rounded and arc-shaped corners, obtuse corners of the slab still have certain shortcomings in improving the uniformity of heat dissipation and improving the smooth and uniform fluidity of the metal.

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