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Method for refining stainless steel with high purity

A stainless steel and refining furnace technology, applied in the field of refining high-purity stainless steel, can solve problems such as difficulty in removing sulfur, increased oxygen content, and poor purity of molten steel

Inactive Publication Date: 2004-09-01
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the case of low basicity of the slag, the oxygen content increases and the purity of molten steel deteriorates
Also, in the refining furnace, it is difficult to remove sulfur from molten steel

Method used

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  • Method for refining stainless steel with high purity
  • Method for refining stainless steel with high purity
  • Method for refining stainless steel with high purity

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Embodiment

[0036] During the production of STS 430 steel (16.5%Cr) using electric furnace, AOD refining furnace, ladle and continuous casting, the raw material consisting of scrap and ferrochromium (Fe-Cr) is melted in a 90-ton electric furnace and subsequently used in AOD Oxygen-argon mixed gas for decarburization and refining. After decarburization and refining, in order to reduce and recover oxidized chromium, add Si, quicklime and fluorite and blow argon for reduction refining. Then tap the steel. In the ladle, argon is blown in while adjusting the final composition and temperature for stirring. Thereafter, by continuous casting, a slab having a width of 1200 mm and a thickness of 200 mm was cast. The cast slab was hot-rolled and cold-rolled, and as a result, a 0.6 mm thick cold-rolled steel sheet was obtained.

[0037] Table 1 below shows the composition of the STS 430 steel used in the present invention. When inspecting inclusions, take a sample at the center of the slab, use a...

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Abstract

The present invention relates to a method of refining a stainless steel with high purity in where a raw material melted in an electric furnace is processed in an argon oxygen decarburization (AOD) refining furnace to be output to a ladle and then subjected to a continuous casting, wherein the occurrence of the refractory hard inclusion material is suppressed by controlling composition and basicity of the slag after the refinery surface reduction process and using the desulphurization process, so that ductility of the inclusion material can be improved and surface defects and cracks of a product can be prevented. The present invention provides a method of refining a stainless steel in where a raw material melted in an electric furnace is processed in an argon oxygen decarburization (AOD) refining furnace to be output to a ladle and then subjected to a continuous casting, wherein a basicity of a slag obtained after reduction process by using the argon oxygen decarburization (AOD) refining furnace is controlled to be in a range between 1.5 and 1.8, wherein a dolomite is used as a refractory material for the ladle, and wherein a composite (% Al2O3)+(% MgO) in the slag is less than 13.

Description

technical field [0001] The present invention relates to a method for refining stainless steel, more particularly, to a method for refining high-purity stainless steel, wherein the raw material melted in an electric furnace is placed in an argon oxygen decarburization (AOD) refining furnace for treatment, transported to a ladle for continuous casting, Among them, by controlling the composition and basicity of the slag after the refining surface reduction process and using the desulfurization process to reduce the occurrence of high melting point hard inclusions, thereby improving the ductility of the inclusions and preventing surface defects and cracks in the product. Background technique [0002] Generally, when the inclusions in stainless steel have a high melting point and are hard inclusions, the inclusions on the surface of the product will cause surface defects or cracks. A process for removing inclusions or lowering the melting point for softening is performed in a sec...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C7/068
CPCC21C7/0087C21C7/0685C21C7/00
Inventor 宋孝锡朴钟焕
Owner POHANG IRON & STEEL CO LTD
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