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Method for making easy-to-pickle steel plate

An easy pickling and steel plate technology, applied in the field of metallurgy, can solve problems such as increasing environmental pollution, and achieve the effects of increasing pickling rate, improving the surface, and improving the rolling rhythm

Inactive Publication Date: 2012-09-19
NORTHEASTERN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, "over-pickling" will inevitably increase environmental pollution, which runs counter to the policy of "energy saving and environmental protection" advocated by the state, so this method must be gradually eliminated as time goes by.

Method used

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  • Method for making easy-to-pickle steel plate
  • Method for making easy-to-pickle steel plate
  • Method for making easy-to-pickle steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Purified molten steel is obtained through smelting, and then cast into slabs through continuous casting machines. The composition weight percentages are: C: 0.045%, Si: ≤0.023%, Mn: 0.21%, P: ≤0.015%, S: ≤ 0.004%, Al: 0.02%, Nb: ≤0.055%, V: ≤0.04%, Ti: ≤0.06%, and the balance is iron;

[0034] Heat the slab to 1200°C for a holding time of 70 minutes; then descale with high-pressure water, the descaling temperature is 1150°C, and the water pressure is required to be 20MPa when descaling;

[0035] Rough rolling is performed on the descaled slab, and the rough rolling temperature is 1130°C. Then carry out finish rolling, the start rolling temperature of finish rolling is 1040°C, the finish rolling temperature is 890°C, and the rolling speed during finish rolling is 3.5m / s; %, the cooling water volumes of the last four racks are 50%, 30%, and 10% respectively, which are used to increase the rolling speed and reduce the thickness of the oxide scale;

[0036] After finishing ...

Embodiment 2

[0038] Purified molten steel is obtained through smelting, and then cast into slabs through continuous casting machines. The composition weight percentages are: C: 0.033%, Si: 0.015%, Mn: 0.22%, P: ≤0.0104%, S: ≤0.01 %, Al: 0.0189%, Nb: ≤0.065%, V: ≤0.04%, Ti: ≤0.06%, and the balance is iron;

[0039] Heat the slab to 1250°C and hold for 40 minutes; then use high-pressure water to descale, the descaling temperature is 1190°C, and the water pressure is required to be 21MPa when descaling;

[0040] Rough rolling is performed on the descaled slab, and the rough rolling temperature is 1140°C. Then finish rolling, the finish rolling start temperature is 1000°C, the finish rolling temperature is 920°C, and the rolling speed during finish rolling is 7.5m / s; in the finish rolling process, the amount of cooling water between the first three stands is 50 %, the cooling water volumes of the last four racks are 40%, 20%, and 15% respectively, which are used to increase the rolling speed ...

Embodiment 3

[0043] Purified molten steel is obtained through smelting, and then cast into slabs through continuous casting machines. The composition weight percentages are: C: 0.032%, Si: ≤0.011%, Mn: 0.177%, P: 0.0087%, S: 0.01% , Al: 0.0209%, Nb: ≤0.065%, V: ≤0.04%, Ti: ≤0.06%, and the balance is iron;

[0044] Heat the slab to 1210°C and hold for 35 minutes; then descale with high-pressure water, the descaling temperature is 1220°C, and the water pressure is required to be 22MPa when descaling;

[0045] The descaled slab is subjected to rough rolling, and the rough rolling temperature is 1145°C. Then carry out finish rolling, the start rolling temperature of finish rolling is 1010°C, the finish rolling temperature is 900°C, and the rolling speed during finish rolling is 8.5m / s; %, the cooling water volumes of the last four racks are 45%, 25%, and 10% respectively, which are used to increase the rolling speed and reduce the thickness of the oxide scale;

[0046] After finishing rollin...

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Abstract

The invention provides a method for making an easy-to-pickle steel plate and belongs to the technical field of metallurgy. The method comprises the following steps of: smelting molten steel, and making a plate blank by continuous casting; descaling by using high pressure water, performing rough rolling on the descaled plate blank, performing finish rolling, cooling to the temperature of 500 to 550 DEG C, cooling at the speed of 5 to 10 DEG C per minute to obtain the steel which is easy to pickle and in a hot rolling state and of which the content of FeO is over 25 percent; performing finish rolling, cooling to the temperature of 650 to 700 DEG C at the speed of 1 to 5 DEG C per minute to obtain the steel which is easy to pickle and in a cold rolling state and has a uniform structure and of which the content of iron oxide scale FeO is less than 10 percent. By adopting the method, the thickness of the iron oxide scale is reduced by 20 to 30 percent compared with the conventional process, the pickling speed of the strip steel is increased from 150 to 160 m per minute to 180 to 200 m per minute compared with the conventional process, not only the pickling quality of the steel plate is guaranteed, but also the pickling efficiency is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a preparation method of an easy pickling steel plate. Background technique [0002] The hot-rolled steel plate will produce a layer of oxide scale on the surface of the steel plate during the rolling process. The typical oxide scale structure consists of the outermost layer of thinner Fe 2 o 3 layer, intermediate Fe 3 o 4 layer and the FeO layer near the substrate side. 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 structure and thickness of the obtained iron oxide scale are changed. Domestically, there is still a lack of sufficient attention to the surface quality of products. The use of some energy-saving technologies (high-temperature hot charging and short-time heating, etc.) has resulted in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/02B21C47/02B21B37/72B21B45/02
Inventor 刘振宇曹光明孙彬王国栋
Owner NORTHEASTERN UNIV
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