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Method for controlling red oxide scale on surface of steckel mill steel plate

A technology of iron oxide scale and control method, which is applied in the field of steel plate rolling, can solve the problems of easily broken surface iron oxide scale and thick iron oxide scale, and achieve the effect of improving quality and improving corrosion resistance.

Active Publication Date: 2014-05-07
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the quality control of the surface oxide scale of the steel plate produced by the steckel mill has its own particularity. When the length of the billet used by the steckel mill is longer and the rolling thickness is thinner, the time interval between the passes of the rolling process is longer, which makes the rolling process of the steel plate more difficult. The temperature is difficult to control and the thickness of the oxide scale formed on the surface is often thick, and the surface oxide scale is easily broken and oxidized into Fe 2 o 3 , resulting in red rust

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The technological process of steel plate rolling is: molten iron pretreatment→converter smelting→RH+LF (or LF+RH) refining→continuous casting→slab inspection→stack cooling→slab acceptance→slab heating→rough descaling→rough rolling→finishing Descaling→finish rolling→laminar cooling→straightening→air cooling→cutting to length (→flaw detection)→sampling (→shot blasting→normalizing heat treatment→straightening→sampling)→printing and marking→inspection→storage.

[0021] Firstly, molten steel is smelted and continuously cast into billets. The thickness of the billet is 150mm, and the composition of the billet is controlled at:

[0022] Element C Si mn P S Nb Ni Mo Ti Alt Fe and impurities Content (wt, %) 0.16 0.21 1.44 0.014 0.003 0.014 0 0 0 0.035 98.124

[0023] Secondly, the cast slabs are piled and cooled to reduce the hydrogen content in the slabs, and at the same time minimize the internal stress generated during cooling. ...

Embodiment 2

[0025] Smelting molten steel and continuous casting into billets, the thickness of the billet is 220mm, and the composition of the billet is controlled at:

[0026] Element C Si mn P S Nb Ni Mo Ti Alt Fe and impurities Content (wt, %) 0.25 0.35 1.6 0.03 0.02 0.04 1 0.5 0.018 0.05 96.142

[0027] After cooling the billet for 48 hours, put the billet into the heating furnace for heating, the temperature of the furnace is controlled at 1250°C, the time in the furnace is 150-170 minutes, and the soaking time is 35 minutes. The steel slab after being released from the furnace is descaled by high-pressure water at the rough descaling place. The descaling temperature is about 1230°C and the descaling pressure is 22MPa. The cast slab after descaling is subjected to four passes of rough rolling, the starting rolling temperature is about 1200°C, the final rolling temperature is 1120°C, and the cumulative reduction is about 40%. Descaling,...

Embodiment 3

[0029] Smelting molten steel and continuous casting into billets, the thickness of the billets is 170mm, and the composition of the billets is controlled at:

[0030] Element C Si mn P S Nb Ni Mo Ti Alt Fe and impurities Content (wt, %) 0.06 0.13 0.9 0.007 0.03 0.021 0.5 0.25 0.009 0.02 98.073

[0031] After cooling the billet for 48 hours, put the billet into the heating furnace for heating, the temperature out of the furnace is controlled at 1200°C, the time in the furnace is 110-140min, and the soaking time is 20min. The steel slab after being released from the furnace is descaled by high pressure water at the rough descaling place, the descaling temperature is about 1180°C, and the descaling pressure is 18MPa. The cast slab after descaling is subjected to four passes of rough rolling, the starting rolling temperature is about 1210°C, the final rolling temperature is 1100°C, and the cumulative reduction is about 50%. Descalin...

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Abstract

The invention relates to the method for controlling a red oxide scale on the surface of a steckel mill steel plate. The method comprises the following steps that a casting blank enters a heating furnace for heating, oxide scale removal of the casting blank is conducted through high pressure water after the casting blank is discharged out of the furnace, rough rolling is conducted on the casting blank after oxide scale removal is conducted, a billet is obtained, and at least three times of oxide scale removal are conducted on the casting blank in the rough rolling step; after rough rolling, finish rolling is conducted on the billet and at least three times of oxide scale removal are conducted on the casting blank in the finish rolling step. The quality of the oxide scale on the surface of the steel plate is improved through control over a oxide scale removal system in the billet rolling technology and the rolling process, the red, loose, multi-hole and smashed oxide scale is prevented from being generated on the surface of the steel plate, a green and compact oxide scale is generated, the quality of the surface of the steel plate is improved, and the corrosion-resistant performance of the surface of the steel plate is further improved.

Description

technical field [0001] The invention belongs to the technical field of steel plate rolling, and in particular relates to a method for controlling red oxide scale on the steel plate surface of a steckel rolling mill. Background technique [0002] In recent years, with the rapid development of the steel industry, the production capacity of medium and heavy plates has been released rapidly. Due to the excess capacity, customers have higher and higher requirements for steel plates. In addition to strict requirements on product performance, they also have higher requirements for the surface quality of steel plates. Require. For a long time, domestic iron and steel enterprises have not paid attention to the surface quality of steel plates, resulting in quality problems such as oxide scale red rust, banding, "pockmarks" and "pockmarks" on the surface of medium and heavy plates, which have been plagued by manufacturers. complete solution. Therefore, preventing iron oxide scale...

Claims

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Application Information

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IPC IPC(8): B21B37/74B21B45/08C22C38/14C21D8/02
Inventor 王晓文党军尹雨群吴年春周成张高伟
Owner NANJING IRON & STEEL CO LTD
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