Method for improving surface quality of P-containing high-strength IF steel continuous annealing sheet

A surface quality and continuous annealing technology, applied in the field of steel rolling, can solve the problems that the surface of the product is difficult to meet the requirements of the O5 plate surface and restrict the improvement of product quality, so as to avoid oxidation and furnace roll nodules, improve the surface quality of the product, and avoid peeling Effect

Active Publication Date: 2019-07-19
SHOUGANG CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, during the hot rolling production process, the P-containing high-strength IF steel has frequent hot-rolling pitting defects, which makes it difficult for the product surface to meet the requirements of the O5 plate surface, which becomes the key to restricting the improvement of product quality.

Method used

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  • Method for improving surface quality of P-containing high-strength IF steel continuous annealing sheet
  • Method for improving surface quality of P-containing high-strength IF steel continuous annealing sheet
  • Method for improving surface quality of P-containing high-strength IF steel continuous annealing sheet

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Embodiment 1

[0044] A method for improving the surface quality of P-containing high-strength IF steel continuous annealing slabs, characterized in that it comprises: continuous casting molten steel to obtain slabs after smelting, heating the slabs, and then rough rolling and finish rolling to obtain hot slabs. Rolling the plate, then carrying out pickling, cold rolling and continuous annealing of the hot-rolled plate, and coiling into a finished product after continuous annealing;

[0045] The molten steel composition includes: C=0.0030wt%, Si=0.05wt%, Cr=0.07wt%, Mn=0.4wt%, P=0.05wt%;

[0046] The slab heating is carried out in a heating furnace at a temperature of 1190°C. The heating process includes an auxiliary heating section, a heating section and a soaking section, and the heating time is 180 minutes, wherein the soaking section time is 30 minutes; the finish rolling inlet temperature is 1000°C, and the finishing rolling speed is 9m / s. The finishing rolling adopts a multi-pass desca...

Embodiment 2

[0048] A method for improving the surface quality of P-containing high-strength IF steel continuous annealing slabs, characterized in that it comprises: continuous casting molten steel to obtain slabs after smelting, heating the slabs, and then rough rolling and finish rolling to obtain hot slabs. Rolling the plate, then carrying out pickling, cold rolling and continuous annealing of the hot-rolled plate, and coiling into a finished product after continuous annealing;

[0049] The molten steel composition includes: C=0.0022wt%, Si=0.08wt%, Cr=0.06wt%, Mn=0.3wt%, P=0.07wt%;

[0050] The slab heating is carried out in a heating furnace at a temperature of 1180°C. The heating process includes an auxiliary heating section, a heating section and a soaking section, and the heating time is 170 minutes, wherein the soaking section time is 33 minutes; the finish rolling inlet temperature is 990 ℃, the finishing rolling speed is 10m / s, the finishing rolling adopts a multi-pass descaling...

Embodiment 3

[0052] A method for improving the surface quality of P-containing high-strength IF steel continuous annealing slabs, characterized in that it comprises: continuous casting molten steel to obtain slabs after smelting, heating the slabs, and then rough rolling and finish rolling to obtain hot slabs. Rolling the plate, then carrying out pickling, cold rolling and continuous annealing of the hot-rolled plate, and coiling into a finished product after continuous annealing;

[0053] The molten steel composition includes: C=0.0030wt%, Si=0.1wt%, Cr=0.1wt%, Mn=0.5wt%, P=0.08wt%;

[0054] The slab heating is carried out in a heating furnace at a temperature of 1200°C. The heating process includes an auxiliary heating section, a heating section and a soaking section, and the heating time is 180 minutes, wherein the soaking section time is 35 minutes; the finish rolling inlet temperature The temperature is 1005°C, and the finishing rolling speed is 14m / s. The finishing rolling adopts a m...

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Abstract

The invention discloses a method for improving the surface quality of a P-containing high-strength IF steel continuous annealing sheet, and belongs to the technical field of steel rolling. The methodcomprises the following steps of smelting and continuously casting molten steel to obtain a slab, heating the slab, then carrying out rough rolling and finish rolling to obtain a hot rolled sheet, then carrying out acid pickling, cold rolling and continuous annealing on the hot rolled sheet, and coiling the continuously-annealed sheet into a finished product, wherein the molten steel comprises thefollowing components of less than or equal to 0.003wt% of C, less than or equal to 0.1wt% of Si, less than or equal to 0.1wt% of Cr, less than or equal to 0.5wt% of Mn, less than or equal to 0.05wt%of Al, and less than or equal to 0.04-0.08wt% of P; and the heating temperature of the slab is 1150-1200 DEG C, the finish rolling inlet temperature is 980-1000 DEG C, the continuous annealing dew point temperature is minus 40 DEG C-minus 30 DEG C, and the soaking temperature is 780 DEG C-800 DEG C. According to the method, the defects of the surface pitting of the hot rolled sheet and the surfacepinpoint of the continuous annealing sheet in the preparation process of the P-containing high-strength IF steel continuous annealing sheet can be overcome, the surface quality of the product can beremarkably improved under the condition that the equipment cost is not increased.

Description

technical field [0001] The invention relates to a method for improving the surface quality of a P-containing high-strength IF steel continuous annealing plate, which belongs to the technical field of steel rolling. Background technique [0002] In order to meet the requirements of automobile lightweight, low energy consumption, low emission and safety performance, and improve the market competitiveness of automobile steel itself, the research and development of thin-strip high-strength steel has been vigorously developed. On the one hand: continuous annealing and galvanizing production lines produce high-strength series steel grades, which show poor platability and furnace roll nodules. This is because the steel plate contains more alloying elements such as Si, Mn, Cr, Al, P, etc., and SiO is easily formed on the surface. 2 , MnO and Mn-Si composite oxides, which seriously deteriorate the surface state of the steel plate. In the process of continuous annealing, alloys such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/46B21B1/22B21B37/74B21B45/00B21B45/04C22C38/02C22C38/06C22C38/04C22C38/18C21D1/26C21D6/00C21D8/02C21D9/56
CPCB21B1/22B21B1/463B21B37/74B21B45/004B21B45/04C21D1/26C21D6/002C21D6/005C21D6/008C21D8/0221C21D9/56C22C38/002C22C38/004C22C38/02C22C38/04C22C38/06C22C38/18
Inventor 于洋王畅王林张亮亮高小丽刘文鑫王泽鹏张栋陈瑾吴耐焦会立曹瑞芳商光鹏
Owner SHOUGANG CORPORATION
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