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Method for producing cold-rolling low-carbon aluminum killed steel with uniform through plate mechanical property

A low-carbon aluminum-killed steel and production method technology, applied in the direction of metal rolling, can solve the problems of low temperature control accuracy, affecting the normal operation of the coiler, and increasing heating costs, so as to improve the uniformity of mechanical properties and pass through the plate. The effect of uniform mechanical properties

Active Publication Date: 2011-09-07
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At the same time, due to the increase of heating costs due to high-temperature rolling, the high temperature of the coil head affects the normal operation of the coiler, and the inconsistency of the cooling modes of the coil head, middle and tail makes it difficult to adapt the temperature control model, resulting in Temperature control accuracy is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The molten iron is subjected to KR desulfurization treatment, full three desulfurization converter, CAS / RH scouring treatment, and then continuous casting; the slab smelting composition: C: 0.030wt%, Si: ≤0.02wt%, Mn: 0.20wt%, P : 0.007wt%, S: 0.008wt%, Alt: 0.028wt%, B: 0.0011wt%, N: 0.0030wt%, and the balance is basically Fe.

[0018] The slab is heated to 1260°C for 3.2 hours, the final rolling temperature is 920°C, and the coiling temperature is 660°C; then it is decoiled on the pickling mill, stretched, straightened, and phosphorus is broken, and then enters shallow tank turbulent flow pickling to remove its surface oxidation After the iron sheet enters the 5-stand cold tandem rolling mill, the reduction rate is 72%. Finally, the vertical continuous annealing unit is uncoiled and cleaned at the entrance and enters the vertical continuous annealing furnace. The temperature in the heating section is 740°C, and the temperature in the fast cooling section is 420 ℃, and...

Embodiment 2

[0020] The molten iron is subjected to KR desulfurization treatment, full three desulfurization converter, CAS / RH scouring treatment, and then continuous casting; the slab smelting composition: C: 0.045wt%, Si: 0.02wt%, Mn: 0.21wt%, P: 0.009 wt%, S: 0.010 wt%, Alt: 0.035 wt%, B: 0.0013 wt%, N: 0.0042 wt%, and the balance is basically Fe.

[0021] The slab is heated to 1260°C, the heating time is 3.2 hours, the final rolling temperature is 920°C, and the coiling temperature is 660°C; then it is uncoiled on the acid rolling unit, stretched, straightened, and phosphorus is broken, and then enters a shallow tank for turbulent pickling to remove its surface After the oxidized iron scale enters the 5-stand cold tandem rolling mill, the reduction rate is 72%. Finally, the vertical continuous annealing unit is uncoiled and cleaned at the entrance and enters the vertical continuous annealing furnace. The temperature in the heating section is 740 ° C, and the temperature in the fast cool...

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Abstract

The invention discloses a method for producing cold-rolling low-carbon aluminum killed steel with a uniform through plate mechanical property, which belongs to the technical field of steel rolling. The method comprises the following process flows of: performing krypton (KR) desulfuration treatment, performing steelmaking by using the conventional converter, performing composition adjustment system (CAS) / relative humidity (RH) refining treatment, continuously casting, and performing hot loading and hot feeding; performing rough rolling, performing precision rolling, performing laminar cooling, and reeling; unreeling, performing acid washing, performing continuous cold rolling, and reeling; and unreeling, washing, continuously annealing, smoothing, and reeling. The method is characterized in that: the cold-rolling low-carbon aluminum killed steel which has the width of 750 to 1,580 mm, the thickness of 0.25 to 2.5 mm and the uniform through plate property is produced by a 2,250 mm or 1,580 mm continuous hot rolling machine set, a 1,700 mm acid rolling machine set and a 1,700 mm continuous annealing machine set. A trace amount of B is added into the low-carbon aluminum killed steel to appropriately improve finish rolling temperatures and appropriately reduce rolling process parameters such as reeling temperatures, annealing temperatures and the like, so that thick boron nitride (BN) is fully separated out; and thin dispersed aluminum nitride (AlN) is effectively prevented from being separated out, so that the uniformity of the through plate mechanical property of the cold-rolling low-carbon aluminum killed steel is improved.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular provides a production method of low-carbon aluminum-killed steel with uniform mechanical properties through the plate, which is a low-cost, high-efficiency production technology for improving the uniform mechanical properties of cold-rolled strip steel. technical background [0002] Cold-rolled steel strip is mainly used in industries such as automobiles and home appliances. In recent years, the output of home appliances and automobiles in my country has increased by leaps and bounds, greatly expanding the market capacity of cold-rolled sheets. Therefore, many iron and steel enterprises position cold-rolled sheets as high-quality, high-value-added products Fist product. However, with the rapid development of industries such as automobiles and home appliances, the requirements for cold-rolled sheets are getting higher and higher, sometimes even harsh, and the uniformity of m...

Claims

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Application Information

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IPC IPC(8): C22C38/06B21B1/24
Inventor 黄来情阳代军朱立新李永林梁轩黄学启高圣勇周建艾矫健王文广
Owner SHOUGANG CORPORATION
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