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Method for improving volume fraction of acicular ferrite in twin-roll cast low-carbon thin strip steel

A technology of acicular ferrite and volume fraction, applied in the field of metallurgy, can solve the problems of poor performance of low-carbon thin strip steel and coarse structure of hot-rolled sheet, and achieve the effect of improving comprehensive performance, refining structure and shortening technical process.

Active Publication Date: 2017-05-31
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the structure of the low-carbon thin strip steel prepared by twin-roll casting and rolling is coarser than that of conventional hot-rolled strips, resulting in poor performance of the low-carbon thin strip steel produced by twin-roll casting and rolling, the present invention provides a method for improving the low-carbon thin strip steel produced by twin-roll casting and rolling. The method of acicular ferrite volume fraction in carbon thin strip steel, through composition design and twin-roll thin strip continuous casting process, obtains a large amount of acicular ferrite structure, shortens the process and reduces costs

Method used

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  • Method for improving volume fraction of acicular ferrite in twin-roll cast low-carbon thin strip steel

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Effect test

Embodiment 1

[0025] Smelting molten steel, the chemical composition contains C 0.03%, Si 0.2%, Mn 1.5%, Al 0.004%, V 0.02%, P 0.005%, S 0.001%, O 0.003%, N 0.01%, and the balance is Fe ;

[0026] Preheat the tundish to 1200°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, and solidify the molten steel through the gap of the casting rolls and export it out at a speed of Be 30m / min, obtain the casting belt that thickness is 2.5mm;

[0027] After the cast strip is exported to the casting roll, it is cooled to 900°C at 10°C / s, and then hot-rolled once to obtain a 2.0mm thick hot-rolled plate;

[0028] After the hot-rolled plate comes out of the hot-rolling mill, it is water-cooled to 550°C for crimping, and the water-cooling rate is 45°C / s to obtain low-carbon thin strip steel; the volume fraction of acicular ferrite in low-carbon thin strip steel is 90%, and the metallographic organize...

Embodiment 2

[0030] The molten steel for smelting contains 0.1% C, 0.3% Si, 1% Mn, 0.01% Al, 0.1% V, 0.003% P, 0.02% S, 0.005% O, 0.008% N, and the balance is Fe ;

[0031] 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 Be 50m / min, obtain the casting belt that thickness is 2.0mm;

[0032] After the cast strip is exported to the casting roll, it is cooled to 1000°C at 12°C / s, and then hot-rolled once to obtain a 1.4mm thick hot-rolled plate;

[0033] After the hot-rolled plate leaves the hot-rolling mill, it is water-cooled to 570°C for crimping, and the water-cooling rate is 35°C / s to obtain a low-carbon thin strip steel; the volume fraction of acicular ferrite in the low-carbon thin strip steel is 63%, and its yield The strength is 450MPa, the tensile str...

Embodiment 3

[0035] Smelting molten steel, the chemical composition contains C 0.17%, Si 0.5%, Mn 1.3%, Al 0.002%, V 0.05%, P 0.01%, S 0.02%, O 0.008%, N 0.015%, and the balance is Fe ;

[0036] Preheat the tundish to 1130°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, and solidify the molten steel through the gap of the casting rolls and export it out at a speed of Be 40m / min, obtain the casting belt that thickness is 2.5mm;

[0037] After the cast strip is exported to the casting roll, it is cooled to 1050°C at 15°C / s, and hot rolling is started to obtain a hot-rolled plate with a thickness of 2.0mm;

[0038] After the hot-rolled plate leaves the hot-rolling mill, it is water-cooled to 650°C for crimping, and the water-cooling rate is 25°C / s to obtain a low-carbon thin strip steel; the volume fraction of acicular ferrite in the low-carbon thin strip steel is 95%, and the yield stre...

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Abstract

A method for improving the volume fraction of acicular ferrite in twin-roll cast low-carbon thin strip steel is carried out according to the following steps that (1) molten steel is smelted, and the chemical components of the molten steel include, by mass, 0.03-0.25% of C, 0.2-0.5% of Si, 1-1.5% of Mn, 0.01% or less of Al, 0.02-0.1% of V, 0.003-0.01% of P, 0.001-0.02% of S, 0.003-0.008% of O, 0.008-0.015% of N, and the balance Fe; (2) a tundish is preheated, the molten steel is poured into twin-roll thin strip casting equipment through the tundish, and the molten steel is solidified and guided out from a roll gap of casting rolls; (3) a cast strip is cooled to 900-1050 DEG C and subjected to hot rolling; and (4) curling is carried out after water cooling. The volume fraction of the acicular ferrite in a low-carbon thin strip steel hot-rolled plate roll is 50-95%, the low-carbon thin strip steel structure is effectively refined, the comprehensive performance of the low-carbon thin strip steel is improved, and the method is short in procedure, saves energy, and is environmentally friendly and low in cost.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for increasing the volume fraction of acicular ferrite in twin-roll cast-rolled low-carbon thin strip steel. Background technique [0002] The twin-roll casting technology uses liquid metal as the raw material, and uses two casting rolls with opposite rotation directions as the crystallizer to make the liquid metal solidify and form through the gap between the casting rolls, and directly produce strips with a thickness of 1~5mm. technology. Compared with the traditional strip steel production process, the twin-roll casting and rolling technology can save production equipment such as continuous casting machines, heating furnaces, rough rolling units and finishing rolling units, making the strip steel production line with a length of several hundred meters in the traditional production process Shortened to 50~60m, it is a short process technology with energ...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/06C21D8/02B22D11/06
CPCB22D11/0622C21D8/0226C21D2211/005C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 袁国王鹤松曹光明李成刚陈弘方烽康健
Owner NORTHEASTERN UNIV
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