Control method of softness of oxide scales on surface of hot-rolling strip steel

A technology of surface oxidation and hot-rolled strip, applied in metal rolling, metal rolling, temperature control and other directions, can solve the problems of increasing equipment investment, natural cooling can not meet the requirements, etc., to reduce FeO broken, reduce thickness, improve The effect of adhesion

Active Publication Date: 2010-10-13
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technology disclosed in the Japanese patent (Patent No. 06-033449) requires the cooling speed of the hot-rolled coil to be above 1°C/s in order to obtain dense iron oxide scale. Natural cooling cannot meet the requirements, which requires industrial fans and water-cooled spray shower c

Method used

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  • Control method of softness of oxide scales on surface of hot-rolling strip steel
  • Control method of softness of oxide scales on surface of hot-rolling strip steel
  • Control method of softness of oxide scales on surface of hot-rolling strip steel

Examples

Experimental program
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Example Embodiment

[0043] Example 1

[0044] The molten steel is smelted and continuously cast into slabs, and its components are C 0.098%, Si 0.23%, Mn 1.26%, P0.016%, S0.002%, Al 0.032%, Nb 0.020%, V0.001%, Ti 0.003%, the balance is iron.

[0045] Heat the slab to 1220°C for 40 minutes. Then use high-pressure water for descaling, the descaling temperature is 1200°C, and the water pressure for descaling is 20MPa.

[0046] The slab after descaling was subjected to rough rolling, the opening temperature was 1150°C, the final rolling temperature was 1030°C, and the cumulative reduction was 78%.

[0047] The rough-rolled slab is descaled before finishing rolling, the descaling temperature is 1050℃, and the water pressure during the second descaling is at least 18MPa; then finishing rolling is carried out, the finishing rolling temperature is 1020℃, and the final rolling temperature is 870 ℃, the cumulative reduction of finishing rolling is 75%, the rolling speed during finishing rolling is 3.5m / s; and af...

Example Embodiment

[0048] Example 2

[0049] The molten steel is smelted and continuously cast into slabs. The components are C 0.071%, Si 0.131%, Mn 1.485%, P0.006%, S0.003%, Al 0.044%, Nb 0.062%, V0.016% by weight. Ti 0.002%, the balance is iron.

[0050] Heat the slab to 1250°C for 40 minutes. , And then use high-pressure water for descaling, the descaling temperature is 1220℃, and the water pressure is 20MPa when descaling is required.

[0051] The slab after descaling is subjected to rough rolling, the opening temperature is 1180°C, the final rolling temperature is 1060°C, and the cumulative reduction is 85%.

[0052] The rough-rolled slab is subjected to finish rolling and then descaling. The descaling temperature is 1080°C, and the water pressure during descaling is at least 18MPa; then, finishing rolling is carried out. The finishing rolling temperature is 1040°C and the final rolling temperature is 880°C. The cumulative reduction of finishing rolling is 75%, and the rolling speed during finis...

Example Embodiment

[0053] Example 3

[0054] The molten steel is smelted and continuously cast into slabs. The components are C 0.089%, Si 0.074%, Mn 1.282%, P0.007%, S0.002%, Al 0.041%, Nb 0.020%, Ti0.001%, The balance is iron.

[0055] Heat the slab to 1230℃, keep it for 30min, and then use high-pressure water for descaling. The descaling temperature is 1200℃, and the water pressure for descaling is 20-25MPa.

[0056] The slab after descaling was rough-rolled, the opening temperature was 1170°C, the final rolling temperature was 1080°C, and the cumulative reduction was 83%.

[0057] The rough-rolled slab is descaled before finishing rolling, the descaling temperature is 1100°C, and the water pressure during descaling is at least 18MPa; then finishing rolling is carried out, the finishing rolling temperature is 1070°C, and the final rolling temperature is 920°C. The cumulative reduction in finishing rolling is 95%, and the rolling speed during finishing rolling is 12m / s; and after finishing rolling, i...

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Abstract

The invention provides a control method of softness of oxide scales on the surface of hot-rolling strip steel, belonging to the technical field of metallurgy. The method comprises the following steps: smelting liquid steel and continuously casting into plate blanks, heating and conducting thermal insulation on the plate blanks, then descaling, and rough rolling; and descaling again, and then finish rolling, wherein the initial rolling temperature is 1020-1070 DEG C, the finish rolling temperature is 870-920 DEG C, the rolling reduction is 75-95%, and the rolling speed is 3.5-12 m/s; cooling to 500-650 DEG C at the speed of 8-25 DEG C/s; and coiling. Aiming to different oxide scales structures, a hot-rolling process regulation scheme is provided in the method. In the hot-rolling process regulation scheme, by controlling the cooling speed and coiling temperature and the degree of a eutectoid reaction of FeO, reasonable control of the structure of the oxide scales is achieved, and loss of mechanical properties of products, which is caused by high temperature rolling, is compensated. The production efficiency is improved by using the existing devices and process conditions in a steel plant, surface quality is improved on the premise of ensuring mechanical properties of the steel plate and flexible production of oxide scale control.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for controlling the flexibility of oxide scales on the surface of hot-rolled steel strips. Background technique [0002] Due to the long-term lack of attention to the surface quality of ordinary carbon steel hot-rolled steel products in my country's metallurgical industry, these products often have problems such as red rust and iron sheet pressing due to improper control of the surface iron sheet, causing many quality objections or even returns, which seriously hinders the improvement of product grades . Therefore, in order to occupy a place in the highly competitive international market, it is necessary to develop a proprietary technology to solve the surface quality problems of our country's hot-rolled steel products. At the same time, in order to adapt to the basic policy of energy saving and emission reduction, the state is increasing the punishment of waste acid ...

Claims

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Application Information

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IPC IPC(8): B21B1/46B21B37/74B21B45/04C22C38/14
Inventor 刘振宇曹光明孙彬石发才崔天燮王立新李成刚贾涛王国栋
Owner NORTHEASTERN UNIV
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