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Method for producing hot rolling strip steel of 0.6-0.8mm

A hot-rolled strip steel and strip steel technology, applied in the direction of metal rolling, etc., to achieve the effect of increasing the service life of the roll, reducing the loss of the roll, and increasing the productivity

Active Publication Date: 2012-07-18
湖南华菱涟源钢铁有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In recent years, there is a publication number CN101293259A "method for producing ultra-thin hot-rolled steel strip with variable specification / constant specification by semi-endless technology", which discloses that the rolling thickness is 0.8-1.8mm and the width is 1229-1265mm. Thin hot-rolled steel strip, as for the production method or rolling method (rolling process) of ultra-thin hot-rolled steel strip with a thickness less than 0.8mm, it has not been reported yet

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  • Method for producing hot rolling strip steel of 0.6-0.8mm
  • Method for producing hot rolling strip steel of 0.6-0.8mm

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Pour molten iron from the blast furnace into a 100-ton oxygen top-bottom composite blowing converter for conventional smelting, and send the molten steel to LF refining. After refining, the molten steel is sent to continuous casting machine 1 for continuous casting. The casting speed is 4.0m / min. The continuous casting slab has a thickness of 56mm and a length of 100m. The continuous casting slab directly enters the roller hearth soaking furnace 2 at high temperature, the soaking temperature in the roller hearth soaking furnace 2 is 1140±20°C, and the soaking time at the end of the continuous casting slab is 16 minutes. After the continuous casting slab exits the roller hearth soaking furnace 2, the surface oxide scale is removed by the descaling machine 3, and the descaled continuous casting slab is sent to the finishing continuous rolling unit 4 for rolling, and the rolling mode adopts all four variable specifications Rolling mode, finished product thickness is 0.75mm...

Embodiment 2

[0029] Pour the molten iron from the blast furnace into a 100-ton oxygen top-bottom compound blowing converter for conventional smelting, and send the molten steel to LF refining. After refining, the molten steel is sent to continuous casting machine 1 for continuous casting. The continuous casting slab has a thickness of 56mm and a length of 167m. The continuous casting slab directly enters the roller hearth soaking furnace 2 at high temperature, the soaking temperature in the roller hearth soaking furnace 2 is 1150±20°C, and the soaking time at the end of the continuous casting slab is 17 minutes. After the continuous casting slab exits the roller hearth soaking furnace 2, the surface oxide scale is removed by the descaling machine 3, and the descaled continuous casting slab is sent to the finishing continuous rolling unit 4 for rolling, and the rolling mode adopts all five variable specifications Rolling mode, the thickness of the finished product is 0.7mm, the thickness of...

Embodiment 3

[0032] Pour the molten iron from the blast furnace into a 100-ton oxygen top-bottom compound blowing converter for conventional smelting, and send the molten steel to LF refining. After refining, the molten steel is sent to continuous casting machine 1 for continuous casting. The continuous casting slab has a thickness of 55mm and a length of 134m. The continuous casting slab directly enters the roller hearth soaking furnace 2 at high temperature, the soaking temperature in the roller hearth soaking furnace 2 is 1160±20°C, and the soaking time at the end of the continuous casting slab is 20 minutes. After the continuous casting slab exits the roller hearth soaking furnace 2, the surface oxide scale is removed by the descaling machine 3, and the descaled continuous casting slab is sent to the finishing continuous rolling unit 4 for rolling, and the rolling mode adopts all four variable specifications Rolling mode, the thickness of the finished product is 0.68mm, the thickness o...

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Abstract

The invention discloses a method for producing hot rolling strip steel of 0.6-0.8mm by adopting an advanced semi-endless rolling technology. The method comprises the following steps of: delivering qualified converter molten steel into a ladle furnace for refining, casting the molten steel into a continuous casting blank with a length of 60-240m, a thickness of 50-60mm and a width of 1,000-1,350mmat a continuous casting drawing speed of 3.5-6.0m / min; directly delivering the continuous casting blank into a roller hearth type soaking pit furnace at 1,100-1,180 DEG C, wherein the soaking time ofthe tail part of the continuous casting blank is longer than 15min; descaling the soaked continuous casting blank and then delivering the continuous casting blank into a fine continuous rolling machine set to carry out multi-segmentation rolling of dynamic specification changing matching or unmatched working roller gap lubrication, wherein the outlet thickness of a first roll F7 used for penetrating is 1.0-1.1mm, and the thickness of a transition section between two adjacent rolls is smaller than 0.2mm, and the specification changing time of the transition section is longer than or equal to 2seconds; and cooling strip steel of which the thickness is smaller than 0.8mm by a laminar flow cooler, then cutting by using a flying shear and rolling into a strip roll by a rolling machine. A strip steel product produced by adopting the method has the advantages of stable structure property, high plate shape precision, good surface quality, short production flow, stability, smoothness, high efficiency and outline range expansion of the product.

Description

technical field [0001] The invention relates to a method for producing hot-rolled strip steel with a thickness of 0.6-0.8mm by adopting a semi-endless process technology, and belongs to the technical category of metal rolling immediately after continuous casting. Background technique [0002] The thin slab continuous casting and rolling process has been practiced for many years. With the improvement of the process technology, on the one hand, the steel types produced have been greatly expanded. On the other hand, it can produce ultra-thin products, realizing the replacement of cold by heat It has become an important development trend of the thin slab continuous casting and rolling process, especially the semi-endless rolling process can overcome the shortage of the strip threading of the rolling mill when rolling ultra-thin products with a single billet, which can not only improve the yield, but also improve the Improve the strip quality, the advantages are quite obvious. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/46
Inventor 成小军周明伟刘旭辉吴浩鸿康永林陈林恒
Owner 湖南华菱涟源钢铁有限公司