Method for controlling coil break defect of thin-gauge low-carbon steel

Abstract

The invention discloses a method for controlling the coil break defect of thin-gauge low-carbon steel, and relates to the field of metallurgy. The method comprises the following steps of feeding, uncoiling, shearing, welding through a welding machine, leveling through a leveling machine, operation about an entry looper, operation through a descaling mill, pickling, rinsing, straightening, operation about an exit looper, shearing and coiling in sequence. Compared with the prior art, the re-judgment rate of the coil break defect can be reduced, and the yield is increased.

Description

technical field [0001] The invention relates to the field of metallurgy, and is specifically aimed at a method for controlling cross-bending defects of 0.7-1.5 mm low-carbon steel hot-rolled raw materials in a pickling production line for a hot-rolling production line. Background technique [0002] With the advancement of steel rolling technology and the development of hot rolling production lines, it is possible to replace cold with hot rolled products. The thickness specification of the hot-rolled sheet is extended to 0.7-4.0mm; the hot-rolled raw material coil yields during the uncoiling process of the uncoiler of the pickling production line, and a cross-bending defect perpendicular to the rolling direction occurs on the surface. [0003] The mechanism of cross-bending defects of hot-rolled coils is mostly due to the existence of the yield platform, and the plastic deformation of the strip will be concentrated in a certain area, thus forming a strip-shaped deformation zo...

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Problems solved by technology

However, the above method is limited to raw material hot-rolled coils with a thickness of 1.5 mm or more. In actual production, when using this method for hot-rolled coils of 0.7-1.5 mm in hot-rolled production lines, due to the process characteristics of hot-rolled production lines, the produced hot-rolled coils themselves require The strength of the hot-rolled coil produced by the traditional process is higher. If the traditional method is used to reduce the coiling temperature of the entire hot-rolled coil and increase the strength to reduce cross-bending defects, the strength of the strip will increase, the elongation will decrease, and the product quality will be sacrificed.

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