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Preparation method of sheet billet continuous casting and rolling easy-acid washing hot rolling strip steel

A thin slab continuous casting and hot-rolled strip technology, applied in metal rolling, metal rolling, manufacturing tools, etc., can solve the problem of difficult pickling on the surface of hot-rolled steel sheets, improve pickling efficiency, and improve horizontal uniformity the effect of reducing the oxidation time

Inactive Publication Date: 2014-05-14
NORTHEASTERN UNIV LIAONING +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the surface of hot-rolled steel sheet is difficult to pickle in the prior art, the present invention provides a method for preparing thin slab continuous casting and rolling hot-rolled steel strip that is easy to pickle. Iron sheet structure, improve the horizontal uniformity of the iron oxide sheet, increase the micro-cracks of the hot-rolled iron sheet, so as to achieve the purpose of reducing the amount of acid used for pickling, improving the pickling efficiency and pickling effect

Method used

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  • Preparation method of sheet billet continuous casting and rolling easy-acid washing hot rolling strip steel
  • Preparation method of sheet billet continuous casting and rolling easy-acid washing hot rolling strip steel
  • Preparation method of sheet billet continuous casting and rolling easy-acid washing hot rolling strip steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Smelting molten steel and continuously casting it into slabs, its composition by weight percentage is C: 0.045%, Si: 0.012%, Mn: 0.18%, P: ≤0.02%, S: ≤0.006%, Al: 0.022%, The balance is iron;

[0032] (2) Heating the slab to 1150°C to take it out of the furnace, and descaling the slab with high-pressure water, the descaling water pressure is 30MPa;

[0033] (3) Put the descaled slab into the finish rolling unit, and then carry out finish rolling. The start rolling temperature of finish rolling is 1110°C, the finish rolling temperature is 880°C, and the rolling speed during finish rolling is 8.9m / s. During the finishing rolling process, the cooling water volume between the first and second racks is 60%, the cooling water volume between the second and third racks is 50%, and the cooling water volume between the third and fourth racks is 40%. %, the cooling water volume between the fourth and fifth racks is 35%, the cooling water volume between the fifth and sixth rac...

Embodiment 2

[0036](1) Smelting molten steel and continuously casting it into slabs, its composition by weight percentage is C: 0.034%, Si: 0.015%, Mn: 0.16%, P: ≤0.02%, S: ≤0.006%, Al: 0.032%, The balance is iron;

[0037] (2) Heat the slab to 1120°C and take it out of the furnace, and descale the slab with high-pressure water, and the descaling water pressure is 32MPa;

[0038] (3) Put the descaled slab into the finish rolling unit, and then carry out finish rolling. The start temperature of finish rolling is 1080°C, the finish rolling temperature is 860°C, and the rolling speed during finish rolling is 9.2m / s. During the finishing rolling process, the cooling water volume between the first and second racks is 70%, the cooling water volume between the second and third racks is 55%, and the cooling water volume between the third and fourth racks is 45%. %, the cooling water volume between the fourth and fifth racks is 30%, the cooling water volume between the fifth and sixth racks is 20%...

Embodiment 3

[0041] (1) Smelting molten steel and continuously casting it into slabs, its composition by weight percentage is C 0.1%, Si 0.2%, Mn 0.05%, P ≤ 0.02%, S ≤ 0.01%, Al 0.01%, and the balance is iron ;

[0042] (2) Heat the slab to 1100°C to leave the heating furnace, and descale the slab with high-pressure water, and the water pressure during descaling is 28MPa;

[0043] (3) Put the descaled slab into the finish rolling unit, and then carry out finish rolling. The start temperature of finish rolling is 1050°C, the finish rolling temperature is 920°C, and the rolling speed during finish rolling is 5m / s. During the rolling process, the cooling water volume between the first and second racks is 70%, the cooling water volume between the second and third racks is 60%, and the cooling water volume between the third and fourth, fourth and fifth racks The cooling water volume of the rack is 30%, and the cooling water volume between the fifth and sixth, sixth and seventh racks is 15% res...

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Abstract

The invention belongs to the technical field of metallurgy and particularly relates to a preparation method of sheet billet continuous casting and rolling easy-acid washing hot rolling strip steel. The preparation method comprises the steps of: smelting liquid steel and continuously casting to form a sheet billet; heating the sheet billet; descaling the sheet billet by using high pressure water and finish-rolling the sheet billet, wherein during the finish rolling process, the water amount of cooling water between a first rack and a second rack is greater than or equal to 60%; the water amount of cooling water between the second rack and a third rack is 50%-60%; the water amount of cooling water between the third rack and a fourth rack and between the fourth rack and a fifth rack is 30-50%; and water amount of cooling water between the fifth rack and a sixth rack and between the sixth rack and a seventh rack is 10-20%; performing ultrafast cooling and laminar flow cooling on the finish-rolled sheet billet to finally obtain iron scale with the content of FeO lower than 10 wt%; and thinning the iron scale for 5-10 microns to obtain the easy-acid washing hot rolling strip steel in a uniform structure. According to the easy-acid washing hot rolling strip steel produced by the preparation method, the iron scale has a rational structure and good uniformity and the surface of the iron scale is provided with a plenty of micro-cracks; in the subsequent acid washing process, the acid washing efficiency of the strip steel is improved, acid consumption is reduced and acid washing efficiency is improved efficiently while the acid washing quality of the sheet steel is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing thin slab continuous casting and rolling easy-pickling hot-rolled strip steel. Background technique [0002] The surface oxide scale of hot-rolled strip steel is generally composed of three layers of iron oxides, and the outermost layer is Fe with a denser columnar crystal structure. 2 o 3 , is red; the middle layer is dense and crack-free Fe 3 o 4 , in black; and the innermost part close to the matrix is ​​loose, porous, and easily destroyed FeO, which is blue-gray. The oxygen content of these oxides gradually decreases from the outside to the inside, and the outer layer is dense, and the inner layer is loose and porous. . According to the Fe-O equilibrium phase diagram, FeO is in a stable state at 570~1371°C; below 570°C, FeO undergoes eutectoid reaction to form α-Fe + Fe 3 o 4 mixture. Under different hot rolling conditions, the st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/46B21B45/08B21B37/74
Inventor 刘振宇刘旭辉曹光明李会张辉波王国栋周明伟成小军
Owner NORTHEASTERN UNIV LIAONING
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