Boron-containing weather-proof thin strip steel and manufacturing method thereof

A manufacturing method and technology of thin strip steel, applied in the field of twin-roll thin strip continuous casting technology, can solve the problems of poor formability, uneven structure, high yield strength ratio, etc.

Active Publication Date: 2012-11-21
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thin strip continuous casting can solve the problems of uneven structure, high yield ratio and poor formability when producin

Method used

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  • Boron-containing weather-proof thin strip steel and manufacturing method thereof
  • Boron-containing weather-proof thin strip steel and manufacturing method thereof
  • Boron-containing weather-proof thin strip steel and manufacturing method thereof

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Embodiment Construction

[0092] see figure 1 , the process of the present invention is: the molten steel passes through the ladle 1, through the ladle long nozzle 2, the tundish 3 and the flow distribution device 4, and directly pours it on a crystallization roller 5a, 5b and a side sealing plate that are relatively rotating and can be cooled rapidly. In the molten pool 7 surrounded by the devices 6a, 6b, molten steel solidifies on the circumferential surface where the crystallization rollers 5a, 5b rotate, and then forms a solidified shell and gradually grows, and then forms a 1-5mm shell at the smallest gap (nip point) between the two crystallization rollers. Thick cast strip 11; Cast strip passes through the secondary cooling device 8 in airtight chamber 10, sprays dry ice (solid-state CO) to cast strip 11 both sides immediately after taking out strip 2), to control the cooling rate, so that the casting belt 11 is rapidly and uniformly cooled to below 1280°C. Then the cast strip is sent to the ho...

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Abstract

Provided are boron-containing weather-proof thin strip steel and a manufacturing method thereof. The manufacturing method comprises performing double roller thin strip continuous casting to produce boron-containing weather-proof steel; after a cast strip is processed through a crystallizing roller, adopting a mode of spraying dry ice to perform uniform strengthened cooling on the cast strip, cooling the cast strip to below 1,280 DEG C, and enabling the cooling speed to be 200-300 DEG C/s, so that precipitation of thick and large BN is promoted, emergency of low-melting-point-phase B203 and precipitation of tiny AlN are avoided, and the aims of homogenizing austenite grains and reducing yield ratio are achieved; then performing austenite on-line recrystallization rolling; then performing atomization cooling on the strip steel undergoing hot rolling, and enabling the cooling temperature to be 10-70 DEG C/s; and enabling coiling temperature to be 650-750 DEG C. Steel with low yield ratio can be obtained through the manufacturing method, and the problems that steel produced by thin strip continuous casting are universally uneven in structure, high in yield ratio and difficult to form and cannot meet the requirements for cold rolling materials are effectively solved.

Description

technical field [0001] The invention relates to a twin-roll thin strip continuous casting process, in particular to a boron-containing weather-resistant thin strip steel and a manufacturing method thereof. Background technique [0002] Traditional thin strips are mostly produced by multi-pass continuous rolling of cast slabs with a thickness of 70-200mm, while cast strips produced by twin-roll thin strip continuous casting process are rolled into hot strips in one or two passes. The rolled strip can be put into the market. Compared with the traditional strip production process, the former has a shorter production line and requires less energy. It is a low-carbon and environmentally friendly hot-rolled thin strip production process. [0003] The typical technological process of twin-roll thin strip continuous casting is: molten steel in the ladle is poured directly into a crystallization roller and side sealing device that rotates relatively and can be cooled rapidly through...

Claims

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Application Information

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IPC IPC(8): C22C38/54C21D8/02B22D11/06B22D11/22
Inventor 吴建春方园于艳
Owner BAOSHAN IRON & STEEL CO LTD
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