A method for reducing strip breakage rate of chromium-containing high carbon steel in pickling and continuous rolling

A high-carbon steel, continuous rolling technology, applied in furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of easily broken belts, poor thermal conductivity, and low internal stress elongation

Active Publication Date: 2022-07-26
新余钢铁股份有限公司
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  • Application Information

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Problems solved by technology

One of the characteristics of laser welding is that the heat-affected zone is small, the weld seam cooling speed is fast, the thermal conductivity is poor, and the grain growth is fast at high welding temperature, and the carbides are easy to accumulate and grow on the grain boundary, which increases the brittleness of the weld seam. , so that the weld strength is reduced
At the same time, the internal stress in the weld is also large and the elongation is low
Continuous cold rolling is produced with high tension. If the elongation of the weld is too low, it is easy to break the strip under the simultaneous action of large rolling force and high tension.

Method used

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  • A method for reducing strip breakage rate of chromium-containing high carbon steel in pickling and continuous rolling
  • A method for reducing strip breakage rate of chromium-containing high carbon steel in pickling and continuous rolling
  • A method for reducing strip breakage rate of chromium-containing high carbon steel in pickling and continuous rolling

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Embodiment

[0022] A method for reducing the rate of strip breakage in pickling continuous rolling of chromium-containing high carbon steel, the method comprising the steps of: removing the strip tail of a previous hot-rolled strip with a thickness of 2.5 mm and a width of 1200 mm and the current strip The lead of the welding machine is welded by a laser welding machine, and the first tempering is realized by the post-heating of the laser welding machine at the same time of welding, and then the second tempering and the third tempering are performed sequentially within the welding seam and its left and right 10mm range. After the third tempering, air-cooled to below 200 ℃, and then entered the pickling tandem rolling unit for cold tandem rolling.

[0023] The steel grades and welding process parameters of each embodiment and comparative example are shown in Table 1 and Table 2, and the process parameters of cold tandem rolling are shown in Table 3:

[0024] Table 1

[0025] C ...

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Abstract

The invention discloses a method for reducing the strip breaking rate of chromium-containing high-carbon steel by pickling and continuous rolling. The first tempering, then the second tempering and the third tempering are performed in sequence, and the cold rolling is performed after the tempering is completed. Improve the elongation at the weld, thereby reducing the strip breakage rate of chromium-containing high carbon steel after being rolled by the pickling tandem mill, and successfully realize the online high-speed mass production of chromium-containing high carbon steel on the pickling tandem mill. .

Description

technical field [0001] The invention belongs to the technical field of iron and steel, and in particular relates to a method for reducing the strip breakage rate of chromium-containing high-carbon steel during pickling and continuous rolling. Background technique [0002] The pickling tandem rolling mill is a fully continuous high-speed production unit. During production, the strip tail of the previous coil and the current strip head are welded together by laser welding equipment to ensure the continuous production of the pickling tandem rolling mill. Commonly known as a weld. The range of steels that can be welded by the pickling tandem mill laser welding machine is: hot-rolled low-carbon steel, ultra-low carbon steel, low-alloy high-strength steel, medium and low grade non-oriented electrical steel, etc. However, Cr-containing high-carbon steels are high-carbon steels, and the alloying element Cr is added, which is not within the welding range of this welding machine. If...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18C21D6/00C21D8/02C21D9/52C22C38/02C22C38/04C22C38/42B21B37/48B23K26/21
CPCC21D1/18C21D6/005C21D6/008C21D6/004C21D8/0236C21D9/52C22C38/02C22C38/04C22C38/002C22C38/42B21B37/48B23K26/21C21D2211/009C21D2211/005
Inventor 卢焱飞徐思情胥建平付志刚钟海清刘志芳杨帆
Owner 新余钢铁股份有限公司
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