Ultra-low carbon steel and production method thereof

A technology of ultra-low carbon steel and production method, which is applied in the field of steel production, can solve problems such as uneven properties of ultra-low carbon steel, and achieve the effects of uniform performance, low energy consumption, and reduced shear stress

Active Publication Date: 2017-06-13
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present application solves the technical problem of uneven performance of ultra-low carbon steel in the prior art by providing an ultra-low carbon steel and its production method, and improves the uniformity and stability of product performance

Method used

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  • Ultra-low carbon steel and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Slab Chemical Composition:

[0031] chemical composition C(％) Si(%) Mn(%) N(％) Al(％) Ti(%) target value 0.003 0.01 0.15 0.002 0.03 0.03

[0032] Control Method:

[0033] The heating temperature at the head of the slab is 1123°C, the heating temperature at the tail is 1106°C, and the heating time is 197 minutes. The finish rolling entrance temperature is 842°C, the minimum rolling speed of the finishing rolling process is 6m / s, and the maximum rolling speed is 7.1m / s. / s 2 , the finishing rolling F1-F7 is put into rolling lubrication for a long time, the amount of lubricating oil for F1 to F7 is 81.6ml / min, 83.1ml / min, 82.2ml / min, 85.6ml / min, 81.2ml / min, 80.5ml / min min, 81.6ml / min, dynamically adjust the cooling water between the finishing stands according to the temperature of the rolling process. The yield strengths of the head, middle and tail of the hot-rolled finished product are: 213Mpa, 215Mpa, 216Mpa; the tensile strengths are...

Embodiment 2

[0035] Slab Chemical Composition:

[0036] chemical composition C(％) Si(%) Mn(%) N(％) Al(％) Ti(%) target value 0.004 0.08 0.13 0.004 0.02 0.036

[0037] Control Method:

[0038] The heating temperature of the head of the slab is 1119°C, the heating temperature of the tail is 1098°C, and the heating time is 185min. The finish rolling entrance temperature is 855°C, the minimum rolling speed of the finishing rolling process is 9m / s, and the maximum rolling speed is 10.2m / s. the s 2, the finishing rolling F1-F7 is put into rolling lubrication for a long time, the amount of lubricating oil for F1 to F7 is 80.6ml / min, 82.1ml / min, 81.3ml / min, 84.8ml / min, 81.9ml / min, 81.5ml / min min, 80.6ml / min, dynamically adjust the cooling water between the finishing stands according to the temperature of the rolling process. The yield strengths of the head, middle and tail of the hot-rolled finished products are: 217Mpa, 216Mpa, 219Mpa; the tensile strengths are...

Embodiment 3

[0040] Slab Chemical Composition:

[0041] chemical composition C(％) Si(%) Mn(%) N(％) Al(％) Ti(%) target value 0.006 0.012 0.14 0.003 0.03 0.045

[0042] Control Method:

[0043] The heating temperature at the head of the slab is 1103°C, the heating temperature at the tail is 1089°C, and the heating time is 195 minutes. The temperature at the entrance of finish rolling is 839°C, the minimum value of rolling speed in the finish rolling process is 6.7m / s, and the maximum value is 7.3m / s. / s 2 , the finishing rolling F1-F7 is put into rolling lubrication for a long time, the amount of lubricating oil for F1 to F7 is 82.3ml / min, 83.3ml / min, 82.7ml / min, 83.9ml / min, 82.4ml / min, 81.8ml / min min, 81.7ml / min, dynamically adjust the cooling water between the finishing stands according to the temperature of the rolling process. The yield strengths of the head, middle and tail of the hot-rolled finished product are: 214Mpa, 213Mpa, 215Mpa; the tensile s...

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Abstract

The invention discloses ultra-low carbon steel. The ultra-low carbon steel comprises, by mass, 0.001-0.01% of C, 0-0.03% of Si, 0-0.005% of N, 0.02-0.05% of Al, 0.02-0.05% of Ti and the balance Fe and unavoidable impurities. The invention further discloses a method for ultra-low carbon steel production. A plate blank obtained through smelting and with chemical components shown as the specification is heated and then subjected to semi-continuous type rough rolling and finish rolling to obtain a hot rolled plate; during finish rolling, the speed difference of the finish rolling outlet full-length rolling head and tail is controlled to be less than or equal to 1.5 m / s, the accelerated speed of a finish rolling end rack is controlled to be less than or equal to 0.02 m / s<2>, and it is guaranteed that the speed of band steel rolling is uniform; and after the hot rolled plate is subjected to laminar flow cooling and then reeled up, a finished product is obtained. According to the ultra-low carbon steel and the production method thereof, the technical problem that in the prior art, the properties of ultra-low carbon steel are not uniform is solved, and uniformity and stability of product performance are improved.

Description

technical field [0001] The invention relates to the technical field of steel production, in particular to an ultra-low carbon steel and a production method thereof. Background technique [0002] At present, when using traditional hot rolling mills for ultra-low carbon steel rolling, rolling in the austenite zone is usually used, and the heating furnace is heated to 1200°C for rolling in the austenite zone, and then cooled to the ferrite zone after rolling. body area. 70% of the energy consumption in the hot rolling process comes from slab heating, causing a series of cost, environmental protection and other issues. At the same time, due to the high temperature of the slab in the conventional rolling process, the temperature drop rate during the rolling process is large, resulting in a large temperature difference between the head and tail of the slab, especially when rolling thin-gauge products below 3.0mm, the temperature of the head and tail of the strip steel The differ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/02C22C38/06C22C38/14B21C37/02
CPCB21C37/02C22C38/004C22C38/02C22C38/06C22C38/14
Inventor 周旬王晓东艾矫健王建功夏银锋赵虎徐海卫范红妹旁二帅周政毕国喜
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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