Production method for rare earth alloying of wide steel strip iron-chromium-aluminum continuous casting slab

A production method and rare earth alloy technology, which is applied in the production field of rare earth alloying of wide steel strip iron-chromium-aluminum continuous casting slabs, can solve the problems of continuous casting water blocking slab transverse cracking and low rare earth yield, and achieve distribution Uniformity and the effect of improving the yield of rare earth

Active Publication Date: 2021-09-17
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the above-mentioned problems existing in the prior art, the present invention proposes a production method for rare earth alloying of wide steel strip iron-chromium-aluminum continuous casting slabs, which solves the problems of low rare earth yield, continuous casting water plugging and casting slab horizontal Cracks and other problems make it possible to stably add 0.02-0.10Wt.% rare earth elements to iron-chromium-aluminum continuous casting slabs with a width of 1000-1300mm and a weight of more than 10 tons, which significantly improves the heat-resistant life of the product

Method used

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  • Production method for rare earth alloying of wide steel strip iron-chromium-aluminum continuous casting slab
  • Production method for rare earth alloying of wide steel strip iron-chromium-aluminum continuous casting slab
  • Production method for rare earth alloying of wide steel strip iron-chromium-aluminum continuous casting slab

Examples

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Effect test

Embodiment 1

[0060] Taking the brand 1Cr13Al4 as an example, its chemical composition by mass percentage is: C: 0.015%, Si: 0.22%, Mn: 0.10%, P: 0.015%, S: 0.0015%, Cr: 13.9%, Al: 4.6%, Ti : 0.23%, N: 0.003%, and the rest are Fe and other unavoidable impurities. The specifications of the iron-chromium-aluminum alloy continuous casting slab are: thickness 200mm, width 1220mm, weight 16.5 tons, and the slab density is 7.4g / cm 3 .

[0061] The production method of the iron-chromium-aluminum continuous casting slab crystallizer feeding wire rare earth alloying of embodiment 1 comprises the following steps:

[0062] (1) Prepare a rare earth wire with a diameter of 2.5mm, the total proportion of lanthanum and cerium elements is 97.5Wt.%, and the density of the rare earth wire is 6.3g / cm 3 , the rare earth wire diameter is uniform.

[0063] (2) The iron-chromium-aluminum molten steel is processed by K-OBM-S→VOD→LF, and the slag above 86% is cleaned after the converter furnace, and the oxygen c...

Embodiment 2

[0069] Taking the brand 0Cr18Al4 as an example, its chemical composition by mass percentage is: C: 0.018%, Si: 0.21%, Mn: 0.48%, P: 0.014%, S: 0.0015%, Cr: 17.2%, Al: 4.0%, Ti : 0.12%, N: 0.004%, and the rest are Fe and other unavoidable impurities. The specifications of the iron-chromium-aluminum alloy continuous casting slab are: thickness 200mm, width 1160mm, weight 15.7 tons, and slab density 7.3g / cm 3 .

[0070] The production method of the iron-chromium-aluminum continuous casting slab crystallizer feeding wire rare earth alloying of embodiment 2 comprises the following steps:

[0071] (1) Prepare a rare earth wire with a diameter of 2.8mm, the total proportion of lanthanum and cerium elements is 98.0Wt.%, and the density of the rare earth wire is 6.3g / cm 3 , the rare earth wire is straight and does not bend.

[0072] (2) The iron-chromium-aluminum molten steel is processed by K-OBM-S→VOD→LF, and the slag above 88% is cleaned after the converter furnace, and the oxyge...

Embodiment 3

[0078] Taking the brand 0Cr21Al6 as an example, its chemical composition by mass percentage is: C: 0.017%, Si: 0.22%, Mn: 0.09%, P: 0.013%, S: 0.001%, Cr: 20.2%, Al: 5.5%, Nb : 0.08%, Ti: 0.13%, N: 0.003%, and the rest are Fe and other inevitable impurities. The specifications of the iron-chromium-aluminum alloy continuous casting slab are: thickness 200mm, width 1080mm, weight 13.1 tons, and slab density 7.2g / cm 3 .

[0079]The production method of the iron-chromium-aluminum continuous casting slab crystallizer feeding wire rare earth alloying of embodiment 3 comprises the following steps:

[0080] (1) Prepare a rare earth wire with a diameter of 3.0mm, the proportion of lanthanum is 97.0Wt.%, and the density of the rare earth wire is 6.2g / cm 3 , The rare earth wire joint is welded firmly.

[0081] (2) The iron-chromium-aluminum molten steel is processed by K-OBM-S→VOD→LF, and more than 90% of the slag is cleaned after the converter furnace, and the oxygen content and sulf...

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Abstract

The invention discloses a production method for rare earth alloying of a wide steel strip iron-chromium-aluminum continuous casting slab. The production method comprises the steps of (1) preparing rare earth wires; (2) sequentially treating iron-chromium-aluminum molten steel through a K-OBM-S furnace, a VOD furnace and an LF furnace; (3) conveying the molten steel treated in the step (2) to a continuous casting machine through a tundish protected in a sealed mode and pouring the molten steel into a crystallizer; and (4) feeding the rare earth wires through a single-machine double-flow method, and preparing the continuous casting slab. According to the production method, by reducing the oxygen and sulfur content of the molten steel and adopting the measures of carrying out protective pouring, selecting the proper wire feeding position and speed, optimizing the components of protective slag and the like, rare earth alloying of the iron-chromium-aluminum continuous casting slab is achieved.

Description

technical field [0001] The invention relates to the technical field of alloy smelting, in particular to a production method for rare earth alloying of wide steel strip iron-chromium-aluminum continuous casting slabs. Background technique [0002] Iron-chromium-aluminum alloy belongs to electrothermal engineering materials, and the content of Cr and Al elements reaches about 13-27Wt.% and 3-7Wt.% respectively. Due to its excellent high temperature resistance and high resistivity, iron-chromium-aluminum strip is widely used in household appliances, industrial furnaces, vehicle exhaust gas purification carriers and other fields. At present, the carrier of the three-way catalyst for vehicle exhaust purification is mainly made of two materials. One is the use of ceramic materials. The main disadvantage of ceramics is that it is not easy to assemble and vibrates and is fragile during operation. High temperature electrothermal alloy, namely 0.04-0.08mm thick iron-chromium-aluminum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/064C21C7/072B22D1/00B22D11/111B22D11/116C21C7/00
CPCC21C7/06C21C7/064C21C7/072C21C7/0056B22D1/002B22D11/111B22D11/116
Inventor 段秀峰张晶晶常国栋武敏付金柱李国平刘洪涛刘春来
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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