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Microalloyed steel direct installing rolling plate crack control method

A control method and technology of micro-alloyed steel, applied in the field of continuous casting technology, can solve problems affecting product quality, casting slabs are not suitable for hot charging, etc., to improve metal yield and output, simple and controllable equipment, and reduce oxidation burning loss Effect

Active Publication Date: 2018-03-13
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2. Slabs with high hydrogen content are not suitable for hot charging
The hydrogen in the steel can only escape through the slow cooling of the slab in the slab. If the slab with high hydrogen content is quenched and then hot-charged, the hydrogen in the slab cannot escape, which will cause damage during the rolling process. New defects that affect product quality
In addition, this technology is only successfully applied to continuous casting slabs with a thickness of less than 150 mm, and there is no report on the successful application of continuous casting slabs with a thickness exceeding 150 mm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Taking Q345B micro-alloy steel produced by thick plate casting machine as an example, the billet section is 1800×230mm, the steady-state casting speed is 1.0m / min, and the Ar3 transformation temperature of the tested steel grade is 750°C. Its chemical composition weight percentage content is: C0.14~0.18%, Si0.25~0.45%, Mn1.35~1.7%, Nb0.01~0.03%, Ti0.005~0.015%, P≤0.025%, S≤ 0.02%.

[0024] 1. Control the composition of the molten steel in the tundish, take a sample of the tundish for chemical composition analysis, the tundish [H]: 0.0001%, [S]: 0.0025%.

[0025] 2. Apply electric pulses to the molten steel in the tundish, the pulse voltage is 800V, the pulse frequency is 25Hz, and the current is 400A.

[0026] 3. Electromagnetic stirring is applied to the solidification end of the secondary cooling of the slab, where the solid phase ratio of the slab is 0.7.

[0027] 4. Apply electric pulses after the slab leaves the straightening section. The start time of applying e...

Embodiment 2

[0031] Taking the AH32 micro-alloy steel produced by the thick plate caster as an example, the billet section is 2200×300mm, the steady-state casting speed is 1.0m / min, and the Ar3 transformation temperature of the tested steel is 800°C. Its chemical composition weight percent content is: C0.10~0.14%, Si0.10~0.22%, Mn1.30~1.45%, Nb0.013~0.03%, Ti0.005~0.015%, Al0.015~0.045%, P≤0.022%, S≤0.01%.

[0032] 1. Control the composition of the molten steel in the tundish, take the tundish sample for chemical composition analysis, the tundish [H]: 0.00009%, [S]: 0.002%;

[0033] 2. Apply electric pulses to the molten steel in the tundish, the pulse voltage is 600V, the pulse frequency is 15Hz, and the current is 350A.

[0034] 3. Electromagnetic stirring is applied to the solidification end of the secondary cooling of the slab, where the solid phase ratio of the slab is 0.75.

[0035] 4. Apply electric pulse after the slab leaves the straightening section. The start time of applying ...

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PUM

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Abstract

The invention relates to a microalloyed steel direct installing rolling plate crack control method. [H] in tundish molten steel is controlled to be smaller than and equal to 0.0002%, and S in tundishmolten steel is controlled to be smaller than and equal to 0.003%; according to different steel balls, electric pulses with the voltage being 500 v to 1000 v, the frequency being 10 Hz to 30 Hz and the current being 300 A-500 A are applied to the molten steel in a tundish; electromagnetic stirring with the frequency being 2 Hz to 10 Hz and the current being 100 A-500 A is applied to the position with the casting blank recooling solidification tail end solid phase rate being 0.6-0.8; according to the different steel balls, electric pulses with the voltage being 1000 v to 3000 v, the frequency being 30 Hz to 50 Hz and the current being 500 A-1000 A are applied to a casting blank, the applying starting time is the time when the surface temperature of the casting blank center position is 900 DEG C to 950 DEG C, and the electric pulses are stopped when the surface temperature drops to Ar3; after the electric pulses are applied, the casting blank is directly fed into a heating furnace to beheated and then rolled, fuel consumption of the heating furnace is reduced, oxidation burning losses of the casting blank are reduced, and the metal yield and productivity are improved.

Description

technical field [0001] The invention belongs to the technical field of continuous casting technology, and in particular relates to a method for controlling cracks in micro-alloy steel direct-loading rolled plates. Background technique [0002] Direct charging refers to a process method in which the continuous casting slab is directly sent to the heating furnace for charging after the surface is properly processed on-line without being cooled off the line. The main advantage of direct installation is to improve production efficiency and save space. Compared with cold installation, it can also save energy and reduce consumption. The main difference from cold charging is that the slab does not have off-line stack cooling; the main difference from traditional hot charging is that in order to minimize the surface cracks of the rolled material, the surface of the slab needs to be properly treated on-line before entering the heating furnace. The key to direct charging is not the f...

Claims

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Application Information

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IPC IPC(8): B22D1/00B22D11/12C21D1/09
CPCB22D1/00B22D11/122C21D1/09
Inventor 康伟栗红吕志升曹亚丹唐雪峰
Owner ANGANG STEEL CO LTD
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