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Low-carbon and high-chromium steel and converter smelting technology thereof

A low-carbon, high-chromium, converter smelting technology, applied in the direction of manufacturing converters, etc., can solve the problems of high cost and limited widespread use.

Active Publication Date: 2013-10-16
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since stainless steel contains a large amount of alloys, the chromium content is 11%~30%, and the cost is high, which limits its wide use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The converter adopts conventional molten iron blowing, and the molten iron is P: 0.092% by weight, and the components of the molten steel at the end of converter blowing are controlled by C: 0.04%, S: 0.013%, P: 0.008%, O: 800ppm; Weak deoxidation, the oxygen content of molten steel is 200ppm; RH decarburization operation end point C: 0.015%; LF furnace carries out chromium alloying and desulfurization operation, add 1 / 5 of micro-carbon ferrochrome before LF starts processing, and when processing for 35 minutes, Add 2 / 5 of micro-carbon ferrochrome; when processing for 62 minutes, add 1 / 5 of micro-carbon ferrochrome; when processing for 83 minutes, add 1 / 5 of micro-carbon ferrochrome, final molten steel composition Cr: 4.7%, S:0.005%; The vacuum degree of RH degassing is 350Pa, the vacuum holding time is 16min, and the end point of molten steel nitrogen is 0.0061%. (Please add specific production process and operation method)

Embodiment 2

[0031] The converter adopts conventional molten iron blowing, the molten iron is P: 0.135% by weight, and the components of the molten steel at the end of converter blowing are controlled by C: 0.03%, S: 0.010%, P: 0.011%, O: 1400ppm; Weak deoxidation, the oxygen content of molten steel is 350ppm; RH decarburization operation end point C: 0.010%; LF furnace performs chromium alloying and desulfurization operation, and 1 / 5 micro-carbon ferrochrome is added before LF treatment starts, and after 32 minutes of treatment, Add 2 / 5 micro-carbon ferrochrome; after 61 minutes of treatment, add 1 / 5 of micro-carbon ferrochrome; after 85 minutes of treatment, add 1 / 5 of micro-carbon ferrochrome, final molten steel composition Cr: 5.3%, S: 0.008%; The vacuum degree of RH degassing is 310Pa, the vacuum holding time is 19min, and the end point of molten steel nitrogen is 0.0052%.

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Abstract

The invention discloses low-carbon and high-chromium steel and a converter smelting technology thereof and belongs to the technical field of metal smelting. The low-carbon and high-chromium steel comprises the components in percentage by weight as follows: 4.5-5.5 percent of Cr, no more than 0.06 percent of C, no more than 1.0 percent of Mn, no more than 0.50 percent of Si, no more than 0.010 percent of S, no more than 0.015 percent of P, no more than 0.0080 percent of N, and the balance of Fe and unavoidable impurities. The converter smelting technology of the low-carbon and high-chromium steel comprises a converter process, an RH decarbonization process, an LF (Ladle Furnace) smelting process and an RH degasification process, adopts common molten iron and smelting equipment, reasonably utilizes the procedure capacity of the equipment so as to successfully obtain the low-carbon and high-chromium steel via smelting, the content of chromium is controlled within the range of 4.5-5.5%., and the content of C is less than or equal to 0.06 percent, so that the requirement of anti-corrosion steel on components is required.

Description

technical field [0001] The invention relates to a low-carbon high-chromium steel and a converter smelting process thereof, belonging to the technical field of metal smelting. Background technique [0002] At present, in order to meet the needs of different corrosion environments, corrosion-resistant steels with a chromium content of 3% to 9% have been gradually developed. When smelting the above-mentioned steel, since the existence of chromium greatly reduces the activity of carbon and oxygen elements in molten steel, in order to achieve the purpose of decarburization and chromium preservation, at present, one-step method of electric furnace or two-step method of electric furnace + VOD is mainly used for smelting. The smelting process requires dephosphorization pretreatment of molten iron or the use of high-quality scrap steel, which requires high smelting costs or requires special equipment. [0003] Since the ultra-low carbon steel with a Cr content greater than or equal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C33/04C21C5/28C21C7/10
Inventor 尹雨群赵晋斌
Owner NANJING IRON & STEEL CO LTD
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