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A Method for Eliminating Transverse Cracks in the Corner of Cold-rolled Base Material Slab

A technology for transverse cracks and casting billets, which is applied in the field of eliminating transverse cracks at the corners of cold-rolled base material billets, can solve the problems of inability to adjust the amount of water, low cooling strength, and unfavorable elimination of transverse cracks at the corners of billets.

Active Publication Date: 2020-05-12
德龙钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This conventional method of "specific water volume" controls the water distribution of the secondary cooling. The problem is that it can only distribute the water volume within a given casting speed range, and the cooling intensity above the fan-shaped section is low. The cooling intensity is high, and the cooling water volume becomes smaller from the fifth and sixth fan-shaped sections. This cooling mode is not conducive to eliminating the transverse cracks at the corners of the slab, and cannot adjust the water volume when the casting speed fluctuates. It is not suitable for the casting slab when the casting speed fluctuates. Quality Control

Method used

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  • A Method for Eliminating Transverse Cracks in the Corner of Cold-rolled Base Material Slab
  • A Method for Eliminating Transverse Cracks in the Corner of Cold-rolled Base Material Slab
  • A Method for Eliminating Transverse Cracks in the Corner of Cold-rolled Base Material Slab

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1: The steel type is SPHC, the chemical composition is C: 0.04%, Mn: 0.25%, Si: 0.01%, P: 0.018%, S: 0.015%, Als: 0.030%, and the tundish temperature is 1550°C, the casting speed is 1.2m / min.

[0042] Crystallizer cooling water is: Q 结晶器总水量 =300V-20=300×1.2-20=340 tons / m2

[0043] Q 结晶器总水量 = (Water volume on wide side + Water volume on narrow side) × 2 = 13 Water volume on narrow side = 340

[0044] Narrow side water volume = 26.15 tons / m2, wide side water volume = 5.5 × 26.15 = 143.85 tons / m2

[0045] The water volume of the foot roller is: Q 宽面足辊 =13.75V-0.625=13.75*1.2-0.625=15.875 tons / m2

[0046] Q 窄面足辊 =2.90V-0.090=2.90*1.2-0.090=3.39 tons / m2

[0047] The amount of water in the bending section is: Q 弯曲段 =21.350V-0.995=21.350*1.2-0.995=24.625 tons / m2

[0048] The volume of water in a fan section: Q 扇形一段 =7.70V+0.450=7.70*1.2+0.450=9.69 tons / m2

[0049] Fan-shaped second stage water volume: Q 扇形二段 =6.375V-0.9725=6.375*1.2-0.9725=6.678 tons / m2

...

Embodiment 2

[0053] Example 2: The steel type is SPHC, the chemical composition is C: 0.04%, Mn: 0.25%, Si: 0.01%, P: 0.018%, S: 0.015%, Als: 0.030%, and the tundish temperature is 1550°C, the casting speed is 0.9m / min.

[0054] Crystallizer cooling water is: Q 结晶器总水量 =300V-20=300×0.9-20=250 tons / m2

[0055] Q 结晶器总水量 = (Water volume on wide side + Water volume on narrow side) × 2 = 13 Water volume on narrow side = 250

[0056] Narrow side water volume = 19.23 tons / m2, wide side water volume = 5.5 × 19.23 = 105.77 tons / m2

[0057] The water volume of the foot roller is: Q 宽面足辊 =13.75V-0.625=13.75*0.9-0.625=11.75 tons / m2

[0058] Q 窄面足辊 =2.90V-0.090=2.90*0.9-0.090=2.52 tons / m2

[0059] The amount of water in the bending section is: Q 弯曲段 =21.350V-0.995=21.350*0.9-0.995=18.22 tons / m2

[0060] The volume of water in a fan section: Q 扇形一段 =7.70V+0.450=7.70*0.9+0.450=7.38 tons / m2

[0061] Fan-shaped second stage water volume: Q 扇形二段 =6.375V-0.9725=6.375*0.9-0.9725=4.765 tons / m2

[0...

Embodiment 3

[0065] Example 3: The steel type is SPHC, the chemical composition is C: 0.04%, Mn: 0.25%, Si: 0.01%, P: 0.018%, S: 0.015%, Als: 0.030%, and the tundish temperature is 1550°C, the casting speed is 1.4m / min.

[0066] Crystallizer cooling water is: Q 结晶器总水量 =300V-20=300×1.4-20=400 tons / m2

[0067] Q 结晶器总水量 = (Water volume on wide side + Water volume on narrow side) × 2 = 13 Water volume on narrow side = 400

[0068] Narrow side water volume = 30.77 tons / m2, wide side water volume = 5.5×30.77=169.24 tons / m2

[0069] The water volume of the foot roller is: Q 宽面足辊 =13.75V-0.625=13.75*1.4-0.625=18.625 tons / m2

[0070] Q 窄面足辊 =2.90V-0.090=2.90*1.4-0.090=3.97 tons / m2

[0071] The amount of water in the bending section is: Q 弯曲段 =21.350V-0.995=21.350*1.4-0.995=28.895 tons / m2

[0072] The volume of water in a fan section: Q 扇形一段 =7.70V+0.450=7.70*1.4+0.450=11.23 tons / m2

[0073] Fan-shaped second stage water volume: Q 扇形二段 =6.375V-0.9725=6.375*1.4-0.9725=7.953 tons / m2

[00...

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Abstract

A method for eliminating transverse cracks at the corners of the cast slab of the cold-rolled base material. According to the austenite transformation process, the cooling mode of the slab at each stage is determined, including: a. The cast slab adopts a forced cooling mode in the crystallizer and the foot roll section , so that MnS is solid-dissolved in the austenite before it can be precipitated; b. The cast slab enters the bending section and adopts a strong cooling mode to avoid the precipitation of film-like ferrite and control the width of film-like ferrite to ≤ 100 μm; c. When the billet enters the third, fourth, fifth and sixth sections of the sector, the weak cooling mode is adopted. According to the evolution law of the casting slab solidification process, combined with the linear analysis of a large number of on-site data, the present invention obtains the empirical formula of the cooling water volume at different casting speeds and at different positions of the continuous casting machine. Adopting the method of the invention can provide the best conditions for the transformation of austenite to ferrite, avoid the precipitation of membranous ferrite, realize the rapid solid solution of the second phase particle MnS, reduce the amount of precipitation, and achieve the elimination of cold-rolled base material cast slab The purpose of the transverse crack at the corner.

Description

technical field [0001] The invention relates to a method for iron and steel smelting, in particular to a method for eliminating transverse cracks at the corners of a cast slab of a cold-rolled base material. Background technique [0002] The cold-rolled base material is aluminum-killed steel, and the Al content in the steel is 0.020-0.060%, which can ensure that 〔O〕≤20ppm in the steel, but because Al is easily combined with N to form AlN, AlN is brittle in austenite crystallization Grain boundaries increase the crack susceptibility of the steel. At present, there are many studies on the formation mechanism and solutions of slab transverse cracks at home and abroad. There are two traditional measures to solve the transverse cracks at the corners of slabs: one is to increase the surface temperature of the slab in the bending or straightening area, so that It is higher than the upper limit of 700-900°C in the brittle trough area; the second is to reduce the surface temperature...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/22
CPCB22D11/22B22D11/225
Inventor 黄伟丽杨志刚陈四平朱红芳谷珊珊
Owner 德龙钢铁有限公司
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