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Method for eliminating edge fault of aluminium killed steel with low manganese-sulfur ratio and low carbon

A low-carbon aluminum-killed steel and manganese-sulfur ratio technology is applied in the field of steel rolling to achieve the effect of reducing the production cost and the difficulty of smelting

Active Publication Date: 2010-12-15
首钢股份公司迁安钢铁公司
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for solving the edge defect of low Mn / S low carbon aluminum killed steel, for low Mn / S low carbon aluminum killed steel after passing the slab off the assembly line, heat preservation and in the hot rolling process for heating and Adjustment and Control of Rolling Process to Eliminate Strip Edge Defects

Method used

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  • Method for eliminating edge fault of aluminium killed steel with low manganese-sulfur ratio and low carbon
  • Method for eliminating edge fault of aluminium killed steel with low manganese-sulfur ratio and low carbon
  • Method for eliminating edge fault of aluminium killed steel with low manganese-sulfur ratio and low carbon

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Embodiment Construction

[0018] Specific implementation examples

[0019] The rolling of low-carbon aluminum-killed steel SPHC (a low-carbon aluminum-killed steel named after a Japanese brand name) was carried out on the 2250mm hot continuous rolling production line of Shougang Qiangang by using the method and control means involved in the present invention. The size of the slab is 230×1250×9000mm, the rolling specification of No. 1~9 is 3.0×1275mm, and the rolling specification of No.10~12 is 3.0×1110mm.

[0020] Table 1 Key points of process control, ℃

[0021]

[0022]

[0023] 1. For No. 1-9 slabs, stack cooling after off-line, the calculated cooling rate is 8°C / min, and air-cooling after No. 10-12 slabs off-line;

[0024] 2. The temperature and residence time of the slabs in each section of the heating furnace are shown in Table 1, and the slabs of No. The slab is cold loaded and heated according to conventional methods;

[0025] 3. For rough descaling of slabs No. 1 to 9, single descali...

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Abstract

The invention relates to a method for eliminating an edge fault of aluminium killed steel with low manganese-sulfur ratio and low carbon, belonging to the technical field of steel rolling. The method comprises the following technological steps of: cooling an offline plate blank in an insulating pit, or slowly cooling by stacking; controlling the atmosphere in a heating furnace and the residence time in each stage, the temperature and the total residence time in the furnace of the plate blank; rolling in an equivalent width mode or widening mode; and adjusting a scale removing mode and a layer cooling mode. The invention has the advantage of eliminating the influence of Mn / S on the quality of steel edges by optimizing heating and rolling technologies under the premise of not increasing extra equipment and investment. Compared with the prior art for eliminating the influence of Mn / S on the quality of band steel edges by increasing the content of Mn or reducing the content of S in the plate blank, the invention can greatly reduce production cost and smelting difficulty. The method is economical and effective, meets the requirements of low carbon and economy of green steel, and is especially applicable to the production of low-carbon aluminium killed steel with 10-30 Mn / S.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular provides a method for solving edge defects of low-manganese-sulfur ratio (manganese-sulfur ratio is represented by Mn / S) low-carbon aluminum-killed steel, and relates to the production of low-Mn / S low-carbon by hot continuous rolling The solution to the edge defects of aluminum-killed steel is suitable for the method of producing lip cracks at the edge of strip steel in the rolling process of low-carbon aluminum-killed steel with Mn / S controlled between 10-30. Background technique [0002] Low-carbon aluminum-killed steel, as a very large amount of stamping steel, generally needs to be used after cold rolling, so it is expected that the hot-rolled plate of this steel type has a lower yield strength. Reducing the content of solid solution elements such as Mn has a significant effect on reducing the yield strength, but reducing the Mn content will cause the Mn / S of the slab ...

Claims

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Application Information

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IPC IPC(8): B21B1/22B21B37/74B21B45/04
Inventor 李明魏建全武军宽王伦亢小敏刘风刚胡志远关建东刘兰霄焦会丽安冬洋
Owner 首钢股份公司迁安钢铁公司
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