Manufacturing method of thin slab casting and rolling high-surface-quality medium-high carbon steel

A technology of continuous casting and manufacturing method of thin slab, applied in metal rolling and other directions, can solve problems such as inapplicability, and achieve the effects of improving surface quality, reducing the difficulty of pickling, and reducing the difficulty of descaling

Active Publication Date: 2017-03-29
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is only applicable to low-carbon steel produced by conventional hot rolling lines, and is not suitable for medium-high carbon steel with high surface quality produced by thin slab continuous casting and rolling

Method used

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  • Manufacturing method of thin slab casting and rolling high-surface-quality medium-high carbon steel
  • Manufacturing method of thin slab casting and rolling high-surface-quality medium-high carbon steel
  • Manufacturing method of thin slab casting and rolling high-surface-quality medium-high carbon steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]The chemical composition range of molten steel after alloying treatment in the refining process is C: 0.30%, Si: 0.17%, Mn: 0.69%, Cr: 0.93%, P: 0.011%, S: 0.004%, N: 0.005%, and the rest It is Fe and unavoidable impurities; the thickness of the continuous casting slab is 50mm; the slab is heated, the temperature of the slab entering the furnace is 812°C, the temperature of the slab leaving the furnace is 1107°C, the time of the slab in the furnace is 41min, and the oxygen content in the furnace is Control at 3.2%; descale with high-pressure water before entering the heating furnace and after leaving the heating furnace. The reduction rate is controlled at 52%, the rolling reduction rate of the second stand of finish rolling is controlled at 60%, the finish rolling temperature is 907°C, the exit speed of the strip steel in the seventh stand of finish rolling is 18m / s, and the strip crown 26μm, the first and second stands of finish rolling, high-pressure water descaling b...

Embodiment 2

[0038] The chemical composition range of molten steel after alloying treatment in the refining process is C: 0.41%, Si: 0.40%, Mn: 0.89%, Cr: 1.10%, P: 0.008%, S: 0.003%, N: 0.007%, and the rest It is Fe and unavoidable impurities; the thickness of the continuous casting slab is 53mm; the slab is heated, the temperature of the slab entering the furnace is 916°C, the temperature of the slab leaving the furnace is 1143°C, the time of the slab in the furnace is 39min, and the oxygen content in the furnace is Control at 2.5%; before entering the heating furnace and after exiting the heating furnace, perform high-pressure water descaling. The reduction rate is controlled at 60%, the rolling reduction rate of the second stand of finish rolling is controlled at 52%, the finish rolling temperature is 910°C, the exit speed of the strip steel in the seventh stand of finish rolling is 15m / s, and the strip crown 34μm, the first and second stands of finish rolling, high-pressure water desc...

Embodiment 3

[0040] The chemical composition range of molten steel after alloying treatment in the refining process is C: 0.54%, Si: 0.29%, Mn: 1.63%, Cr: 0.18%, P: 0.007%, S: 0.005%, N: 0.006%, and the rest It is Fe and unavoidable impurities; the thickness of the continuous casting slab is 59mm; the slab is heated, the temperature of the slab entering the furnace is 871°C, the temperature of the slab exiting the furnace is 1129°C, the time of the slab in the furnace is 34min, and the oxygen content in the furnace is Control at 4.8%; before entering the heating furnace and after exiting the heating furnace, perform high-pressure water descaling. The reduction rate is controlled at 50%, the rolling reduction rate of the second stand of finish rolling is controlled at 57%, the finish rolling temperature is 880°C, the exit speed of the strip steel in the seventh stand of finish rolling is 11m / s, and the strip crown 43μm, the first and second stands of finish rolling, high-pressure water desc...

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Abstract

The invention discloses a manufacturing method of thin slab casting and rolling high-surface-quality medium-high carbon steel. The manufacturing method comprises the following steps that (1) smelting and continuous casting are carried out to obtain a blank, and the thickness of the casting blank ranges from 50 mm to 70 mm; (2) the continuous casting blank is heated in a heating furnace, the temperature of the casting blank fed in the furnace ranges from 812 DEG C to 1053 DEG C, the temperature of the casting blank discharged out of the furnace ranges from 1107 DEG C to 1182 DEG C, the time of the casting blank in the furnace ranges from 26 min to 41 min, the volume fraction of oxygen in a hearth is controlled to range from 1.1% to 4.8%, and high-pressure water descaling is carried out before the casting blank is fed in the heating furnace and after the casting blank is discharged out of the heating furnace; (3) at least six passes of finish rolling are carried out, in the finish rolling process, the rolling reduction rate of a first rack and the rolling reduction rate of a second rack are controlled to range from 50% to 60%, high-pressure water descaling is carried out between the finish rolling first rack and the finish rolling second rack and between the second rack and a third rack, and the finish rolling temperature of finish rolling ranges from 880 DEG C to 910 DEG C; and (4) cooling and rolling are carried out to obtain a finished steel roll. According to the thin slab casting and rolling high-surface-quality medium-high carbon steel produced through the method, the thickness of oxide scale is only 3.9 micrometers to 6.9 micrometers, the volume fraction of FeO in the oxide scale structure reaches 51%-72%, the acid pickling difficulty is greatly reduced, and the product surface quality is improved.

Description

technical field [0001] The invention relates to a medium-high carbon steel with high surface quality, in particular to a method for manufacturing medium-high carbon steel with high surface quality by continuous casting and rolling of thin slabs. Background technique [0002] Medium-high carbon steel has the characteristics of high strength, high hardness and high wear resistance. It is mainly used to make various cutting knives and special tools. It is widely used in papermaking, forestry, rubber, plastics, textiles, electrical appliances, light industrial machinery and other fields. . [0003] At present, the production process of most medium and high carbon steel products is: steelmaking → continuous casting → heating → hot rolling → pickling → cold rolling. Before cold rolling of medium-high carbon steel, it is necessary to remove the scale on the surface of the hot-rolled strip, and then carry out the next step of deep processing. Generally, pickling is used as the remo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02B21B1/46C22C38/04C22C38/02C22C38/18C22C38/38
CPCB21B1/46C21D8/0226C22C38/02C22C38/04C22C38/18C22C38/38
Inventor 甘晓龙毛新平孙宜强蔡珍汪水泽徐进桥李国彬谭文王成郑海涛
Owner 武汉钢铁有限公司
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