Boron-containing micro-alloy weather resisting steel and manufacturing method thereof

A technology of atmospheric corrosion-resistant steel and a manufacturing method, applied in the field of continuous casting technology, can solve the problems of poor formability, uneven structure and high yield ratio

Active Publication Date: 2012-11-21
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • 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 producing this kind of steel, so as to meet the use requirements of cold-rolled base material and "replacing cold with heat" products

Method used

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  • Boron-containing micro-alloy weather resisting steel and manufacturing method thereof
  • Boron-containing micro-alloy weather resisting steel and manufacturing method thereof
  • Boron-containing micro-alloy weather resisting steel and manufacturing method thereof

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Embodiment Construction

[0111] see figure 1 , the technological process of the present invention: the molten steel passes through the ladle 1, and is directly poured on a crystallization roller 5a, 5b and a side sealing plate which are rotated relatively and can be cooled rapidly through the ladle shroud 2, the tundish 3 and the flow distribution device 4 In the molten pool 7 surrounded by the devices 6a and 6b, the molten steel solidifies on the rotating circumferential surface of the crystallization rollers 5a and 5b, 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 belt11. The casting strip passes through the secondary cooling device 8 in the airtight chamber 10, and immediately sprays dry ice (solid CO 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 hot rolling mill 13 by swinging...

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Abstract

The invention relates to boron-containing micro-alloy weather resisting steel and a manufacturing method thereof. The boron-containing weather resisting steel is continuously cast by a twin-roll thin strip, a cast strip is uniformly reinforced and cooled by spraying dry ice after exiting a crystallization roll, the cast strip is rapidly cooled to the temperature lower than 1280 DEG C at the speed of 200-300 DEG C/s, precipitation of thick BN can be promoted in the cooling mode, B2O3 with a low melting point and precipitation of thin AlN are prevented, accordingly, austenite crystal grains are homogenized, and the yield ratio is reduced. Online austenite recrystallization rolling and anti-oxidation rapid cooling at the speed of 80-200 DEG C/s are performed, and the coiling temperature is 500-600 DEG C. The steel with the low yield ratio can be obtained, and the ubiquitous problem that steel continuously cast by a thin strip is inhomogeneous in structure, high in yield ratio, difficult in forming and incapable of meeting the requirement of cold rolling of materials is solved.

Description

technical field [0001] The invention relates to a continuous casting process, in particular to a boron-containing micro-alloy steel resistant to atmospheric corrosion 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 th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C21D8/02B22D11/06B22D11/22
Inventor 吴建春于艳方园
Owner BAOSHAN IRON & STEEL CO LTD
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