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Method for eliminating linear edge defects of hot-rolled low-carbon steel

A linear defect, low carbon steel technology, applied in the direction of metal rolling, metal rolling, workpiece surface treatment equipment, etc., can solve the problem of eliminating linear defects on the edge and making it practical and feasible, so as to avoid the phenomenon of mixed crystals and avoid Rolling in the dual-phase region, the effect of small temperature drop

Active Publication Date: 2015-03-04
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Based on the methods disclosed in the above documents, the main purpose is to control the distance of edge defects, and no practical method has been proposed to eliminate edge linear defects.

Method used

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  • Method for eliminating linear edge defects of hot-rolled low-carbon steel
  • Method for eliminating linear edge defects of hot-rolled low-carbon steel
  • Method for eliminating linear edge defects of hot-rolled low-carbon steel

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Embodiment 1

[0035] According to the method of the present invention, three kinds of low-carbon steels are rolled, which are expressed as: A1, A2, and A3 according to the composition difference of steel grades.

[0036] After the continuous casting slab is heated, high-pressure water descaling is performed. Among the two-stage water nozzles of the high-pressure water descaling box, only one section of the descaling water nozzle near the inlet end is opened, and the descaling water nozzle at the outlet end is closed.

[0037] After that, the width is adjusted by the width-adjusting side press, and then 2-stand rough rolling is carried out. The rough rolling adopts 1-5 passes, R1 rolling 1 pass, R2 rolling 5 passes, descaling at the exit of R1, and other passes Second descaling water off.

[0038] Therefore, because the continuous casting slab is not cooled by the descaling water for a short time before rolling, there is enough time to return to temperature, ensuring that the temperature dif...

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Abstract

Disclosed is a method for eliminating linear edge defects of hot-rolled low-carbon steel. The method is characterized by comprising following technological processes: step one, heating continuous casting billet; step two, descaling with high-pressure water; step three, using a sizing press for width adjustment; step four, roughly rolling; step five, preserving heat with a thermal insulation cover; step six, heating edges; step seven, cutting heads and tails with a flying shear; step eight, performing finish rolling for descaling; step nine, performing finish rolling; step ten, performing laminar cooling; and step eleven, reeling. The method is further characterized in that a place equal to the continuous casting billet in size is reserved between the continuous casting billet and a furnace outlet when heating the continuous-cast billet at the step one is performed. According to the method for eliminating the linear edge defects of the hot-rolled low-carbon steel, the linear edge defects of the hot-roller low-carbon steel can be eliminated only by adjusting process parameters while modification of production line equipment is not needed, and coexistence region rolling is avoided, so that mixed grain of hot-rolled strip steel is avoided.

Description

technical field [0001] The invention belongs to the technical field of hot rolling, in particular, the invention relates to a method for eliminating linear defects on the edge of hot-rolled low-carbon steel Background technique [0002] Due to its excellent deep drawing performance, hot-rolled low-carbon steel can meet the requirements of various complex shaped products, so it is widely used in shaped products such as automobiles, home appliances, and various instruments and meters. At the same time, this type of product has higher and higher requirements on the surface quality of the steel plate, especially the steel plate with no surface defects is often used for the outer cover of the car. Therefore, various surface defects in the rolling process will seriously affect the quality of formed products and the economic benefits of enterprises. [0003] A kind of edge linear defect often appears on the surface of hot-rolled low-carbon steel, and this type of defect is also of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/46B21B45/08B21B37/74
Inventor 张所全王金涛龚羽夏小明吴亚萍秦建超
Owner BAOSHAN IRON & STEEL CO LTD
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