Method for improving yield of low-carbon high-microalloyed steel

A micro-alloyed steel, yield technology, applied in furnace control devices, lighting and heating equipment, furnace components, etc., can solve the problems of decreased product yield, increased oxidation burning loss, and excessive air volume.

Active Publication Date: 2020-12-29
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, it is easy to cause excessive air volume and increase oxidation burning loss, which will lead to a decrease in product yield

Method used

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  • Method for improving yield of low-carbon high-microalloyed steel
  • Method for improving yield of low-carbon high-microalloyed steel
  • Method for improving yield of low-carbon high-microalloyed steel

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Experimental program
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Effect test

Embodiment Construction

[0017] The present invention will be further described in detail below in conjunction with specific examples.

[0018] The steel slab is smelted by the oxygen converter, and the straight arc continuous casting machine is cast into a continuous casting slab. The chemical elements of each component are controlled as shown in Table 1.

[0019] Table 1 Slab Chemical Composition / wt%

[0020]

[0021] The cast slabs in Table 1 are put into the walking heating furnace after surface inspection, and the heating is controlled in sections. The heating rate and furnace temperature of each section are shown in Table 2.

[0022] Table 2 Actual performance of steel billet heating process

[0023]

[0024] The atmosphere in the furnace is controlled by the calorific value of the gas and the amount of air introduced, and the actual results are shown in Table 3.

[0025] Table 3 Gas calorific value and air volume control performance

[0026]

[0027] See Table 4 for the scale weigh...

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Abstract

The invention discloses a method for improving a yield of low-carbon high-microalloyed steel. Sectional heating is adopted in a heating furnace, a preheating section conducts heating at a heating rateof 5.80-24.87 DEG C/min, a first heating section conducts heating at a heating rate of 3.41-11.78 DEG C/min, a second heating section conducts heating at a heating rate of 0.53-7.54 DEG C/min, and asoaking section conducts heating at a heating rate of 0.08-1.44 DEG C/min. An oxidation burning loss rate of the low-carbon high-microalloyed steel is reduced by performing sectional heating in the furnace, setting the heating rate of each section in the furnace and a tapping temperature range of steel billets, reasonably adjusting an air-fuel ratio of each section of the heating furnace, determining the optimal control range of the air-fuel ratio of each section and the like, so that the yield of the low-carbon high-microalloyed steel is equal to or greater than 98%.

Description

technical field [0001] The invention belongs to the technical field of ferrous metal manufacturing, and in particular relates to a method for improving the yield of low-carbon high-micro-alloy steel. Background technique [0002] Low-carbon high-microalloy hot-rolled steel plate has a high level of thickness precision control. Factors affecting its yield include heating, oxidation, burning, rolling head and tail removal, etc. Due to the large amount of alloying elements added, the carbon content is low during the heating process. It is very easy to oxidize in the medium, so the influence of oxidation burning loss accounts for more than 80% of the entire yield, so controlling the oxidation burning loss in the heating furnace of low-carbon high-micro-alloy steel becomes the key process. Usually, the heating furnace adopts the method of manually setting thermal parameters such as air ratio through design calculation and empirical data. Once the setting parameters are determine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D19/00C21D9/70C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50
CPCF27D19/00C21D9/70C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50F27D2019/0034
Inventor 吴敬阳王世森曹炳雷雷廷魏兵张鹏武丁茹
Owner 武汉钢铁有限公司
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