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Method capable of removing head transverse fold lines of low-carbon steel hot rolling pickle sheet

A technology of hot-rolled pickling and low-carbon steel, which is applied in metal rolling, metal rolling, rolling force/roll gap control, etc., to reduce the generation of transverse creases, improve surface quality, and increase yield strength

Active Publication Date: 2020-05-15
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem in the prior art that the head cross folds of the low carbon steel hot-rolled pickled plate cannot be fundamentally avoided, the present invention provides a method for eliminating the head cross folds of the low carbon steel hot-rolled pickled plate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] This embodiment provides a method for eliminating transverse creases at the head of a low-carbon steel hot-rolled pickled plate. Cool the low-carbon steel hot strip after finishing rolling with a carbon content of 0.56wt% and a thickness of 1.5mm to 550°C and then curl it. After curling, it is cooled by centralized cooling at the head, and the laminar cooling rate is 27°C / s, cooled to 50°C and then leveled. During the leveling process, the rolling force was 1800KN, and the crimping tension was 150KN. The surface quality of the pickling board obtained by this treatment method is good, and there is no horizontal crease.

Embodiment 2

[0017] This embodiment provides a method for eliminating transverse creases at the head of a low-carbon steel hot-rolled pickled plate. Cool the low-carbon steel hot strip with a carbon content of 0.71wt% and a thickness of 2.0mm to 560°C and then curl it. After curling, it is cooled by centralized cooling at the head, and the laminar cooling rate is 27°C / s, cooled to 48°C and then leveled. During the leveling process, the rolling force was 1850KN, and the crimping tension was 160KN. The surface quality of the pickling board obtained by this treatment method is good, and there is no horizontal crease.

Embodiment 3

[0019] This embodiment provides a method for eliminating transverse creases at the head of a low-carbon steel hot-rolled pickled plate. Cool the low-carbon steel hot strip after finish rolling with a carbon content of 0.80wt% and a thickness of 3.0mm to 570°C and then curl it. After curling, it is cooled by centralized cooling at the head, and the laminar cooling rate is 26°C / s, cooled to 49°C and then leveled. During the leveling process, the rolling force was 1900KN, and the crimping tension was 170KN. The surface quality of the pickling board obtained by this treatment method is good, and there is no horizontal crease.

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Abstract

The invention relates to the field of steel rolling, in particular to a method capable of removing head transverse fold lines of a low-carbon steel hot rolling pickle sheet. Through curling temperature and head centralized cooling manner combination and limiting of laminar flow cooling speeds, the yield strength of a low-carbon steel hot steel strip can be improved, generation of the transverse fold lines in the leveling process can be thoroughly reduced, the surface quality of the hot rolling pickle sheet can be improved, and the high surface quality needs of the hot rolling pickle sheet canbe met.

Description

technical field [0001] The invention relates to the field of steel rolling, in particular to a method for eliminating transverse creases at the head of a low-carbon steel hot-rolled pickled plate. Background technique [0002] Hot-rolled pickled sheets have higher surface quality, better dimensional accuracy control, and a lower price than cold-rolled sheets, so they are in greater demand in the market. Low-carbon steel accounts for a relatively high proportion of hot-rolled pickled sheets, but in the process of flattening low-carbon steel hot-rolled pickled sheets, surface transverse creases are a common defect, which is the low-carbon steel coil after flattening. Strip creases that appear on the surface of the steel coil and extend along the cross-section of the steel plate have an obvious concave-convex feel. Generally, horizontal creases appear at the head of the steel coil for 30-50 meters, and in severe cases, horizontal creases will appear through the coil. It can b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B15/00B21B45/02B21B37/58
CPCB21B15/00B21B37/58B21B45/0203B21B2015/0057B21B2015/0071
Inventor 梁静召郝占全周景鑫杨永波张斯杨英
Owner HEBEI IRON AND STEEL
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