Manufacturing method for low-carbon thin strip steel containing acicular ferrite

A technology of acicular ferrite and manufacturing method, which is applied in the field of metallurgy, can solve problems such as high energy consumption, high cost, and complex production process, and achieve the effects of uniform distribution, fine structure, and complex production process

Active Publication Date: 2017-03-22
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] Aiming at the above-mentioned problems existing in the prior art of preparing low-carbon thin strip steel by twin-roll thin strip continuous casting technology, the present invention provides a method for manufacturing low-carbon thin strip steel containing acicular ferrite, which can obtain a large amount of acicular ferrite Nuclear position, so as to obtain low-carbon thin strip steel containing acicular ferrite, refine the structure of low-carbon thin strip steel, and solve the problems of traditional low-carbon thin strip steel production process, such as complex production process, high cost, and large energy consumption

Method used

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  • Manufacturing method for low-carbon thin strip steel containing acicular ferrite
  • Manufacturing method for low-carbon thin strip steel containing acicular ferrite

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Experimental program
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Effect test

Embodiment 1

[0024] The molten steel for smelting contains 0.16% of C, 0.6% of Si, 0.5% of Mn, 0.0028% of Al, 0.3% of Zr, 0.05% of P, 0.02% of S, 0.015% of O and 0.002% of N in terms of chemical composition, and the balance is Fe;

[0025] Preheat the tundish to 1100°C, pour the molten steel in the ladle into the twin-roll strip continuous casting equipment through the tundish, control the pouring temperature at 1540°C, and solidify the molten steel through the gap of the casting rolls and export it out at a speed of 35m / min to obtain a cast strip with a thickness of 2.5mm;

[0026] After the cast strip is exported, it is cooled to 1000°C at 15°C / s, and hot rolling is started to obtain a 2.0mm thick hot rolled plate;

[0027] The hot-rolled sheet is water-cooled to 600°C for crimping, and the water-cooling rate is 30°C / s to obtain acicular ferrite-containing low-carbon thin strip steel; The volume fraction is 80%, and the metallographic structure is as follows figure 2 As shown, the yi...

Embodiment 2

[0029] The molten steel for smelting contains 0.02% of C, 0.2% of Si, 0.7% of Mn, 0.0035% of Al, 0.3% of Zr, 0.05% of P, 0.02% of S, 0.015% of O and 0.002% of N in terms of chemical composition, and the balance is Fe;

[0030] Preheat the tundish to 1150°C, pour the molten steel in the ladle into the twin-roll strip continuous casting equipment through the tundish, control the pouring temperature at 1540°C, and solidify the molten steel through the gap of the casting rolls and export it out at a speed of 35m / min to obtain a cast strip with a thickness of 2.3mm;

[0031] After the cast strip is exported, it is cooled to 1000°C at 20°C / s, and hot rolling is started to obtain a 1.8mm thick hot-rolled plate;

[0032] The hot-rolled sheet is water-cooled to 600°C for crimping, and the water-cooling rate is 35°C / s to obtain acicular ferrite low-carbon thin strip steel; the acicular ferrite containing acicular ferrite low-carbon thin strip The volume fraction is 65%, the yield stre...

Embodiment 3

[0034] The molten steel for smelting contains 0.18% of C, 0.4% of Si, 0.5% of Mn, 0.002% of Al, 0.2% of Zr, 0.003% of P, 0.001% of S, 0.01% of O, and 0.004% of N in terms of chemical composition, and the balance is Fe ;

[0035] Preheat the tundish to 1170°C, pour the molten steel in the ladle into the twin-roll strip continuous casting equipment through the tundish, control the pouring temperature at 1520°C, solidify the molten steel through the gap of the casting rolls and export it out at a speed of 50m / min to obtain a cast strip with a thickness of 2.1mm;

[0036] After the cast strip is exported, it is cooled to 900°C at 25°C / s, and hot rolling is started to obtain a 1.5mm thick hot-rolled plate;

[0037]The hot-rolled sheet is water-cooled to 620°C for crimping, and the water cooling rate is 50°C / s to obtain acicular ferrite low-carbon thin strip steel; the acicular ferrite containing acicular ferrite low-carbon thin strip The volume fraction is 40%, the yield strength...

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Abstract

The invention provides a manufacturing method for low-carbon thin strip steel containing acicular ferrite. The manufacturing method comprises the following steps that (1), smelting of molten steel is performed, the molten steel comprises, by mass percentage, 0.02-0.18% of C, 0.2-0.6% of Si, 0.5-1% of Mn, 0.002-0.0035% of Al, 0.05-0.3% of Zr, 0.003-0.15% of P, 0.001-0.02% of S, 0.003-0.015% of O, not larger than 0.004% of N and the balance Fe; (2), preheating of a tundish is performed, the molten steel in a steel ladle is poured into double-roller strip continuous-casting equipment through the tundish, the molten steel is solidified and guided out through a roller seam of a cast roller, and a cast strip is obtained; (3), the cast strip is cooled to 900-1,000 DEG C after being guided out, and one-path hot rolling begins; and (4), the cast strip is water-cooled to 550-620 DEG C and curled, and the low-carbon thin strip steel containing the acicular ferrite is obtained. According to the manufactured low-carbon thin strip steel containing the acicular ferrite, the content of the acicular ferrite ranges from 40% to 90%, the structure of the low-carbon thin strip steel is refined effectively, and the problems that a traditional production process of the low-carbon thin strip steel is complex, high in cost, large in energy consumption and the like are solved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for manufacturing low-carbon thin strip steel containing acicular ferrite. Background technique [0002] Oxide metallurgy technology was first proposed in the process of high input energy welding, and has been maturely applied in high input energy welding. Through oxide metallurgy technology, the fine and evenly distributed oxide inclusions in the weld can be used as the nucleation particles of intragranular acicular ferrite, so that the weld can obtain acicular ferrite structure, thereby improving the toughness of the weld. And can effectively hinder the expansion of cracks. In addition to using acicular ferrite to improve toughness in large heat input welding, acicular ferrite has also been used in pipeline steel to a certain extent. The use of acicular ferrite structure in pipeline steel can effectively improve its toughness, reduce the ductile-brittl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14B22D11/06C21D8/02
CPCB22D11/06C21D8/0226C21D2211/005C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 袁国王鹤松曹光明李成刚陈弘方烽康健王国栋
Owner NORTHEASTERN UNIV
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