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Method for increasing sulfur yield of high sulfur stainless steel

A stainless steel, yield technology, applied in the field of improving the sulfur yield of stainless steel with high sulfur content, can solve the problems of unstable content, low sulfur yield of stainless steel with high sulfur content, etc.

Active Publication Date: 2013-06-12
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the current high-sulfur content stainless steel has low sulfur yield and unstable content, the present invention provides a method for increasing the sulfur yield of high-sulfur stainless steel, so that the sulfur yield is increased from less than 40% currently to More than 65%, so that the deviation between the sulfur content in the molten steel out of the LF furnace and the sulfur content in the finished product is stabilized within 0.005%

Method used

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Examples

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Embodiment

[0032] This example is carried out on a 90-ton VOD refining furnace and an LF furnace. The molten steel is 83.3 tons. Two bottom blowing gas supply devices are installed at the bottom of the ladle used. The degree is 50Pa.

[0033] The smelting steel grade of this embodiment is T303CS3, and the mass percent of finished product composition is:

[0034] C 0.04-0.06; Si 0.10-0.50; Mn 2.40-2.80; P≤0.035;

[0035] S 0.200-0.300; Cr 17.00-18.00; Ni 8.00-9.00;

[0036] Cu 2.00-3.00; N 0.02-0.06; the rest is Fe and unavoidable impurities.

[0037] I Decarburization of molten steel by blowing oxygen in VOD refining furnace

[0038] In the VOD refining furnace, the molten steel temperature at the station is 1620°C, the ladle space is 1300mm (the distance from the slag liquid level to the upper edge of the ladle), and the slag thickness is 40mm. The mass percentage of the molten steel composition before oxygen blowing decarburization is:

[0039] C 0.26; Si 0.12; Mn 2.58; P 0.025; S ...

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Abstract

The invention relates to a method for increasing the sulfur yield of high sulfur stainless steel, comprising the following steps: after reducing molten steel in a VOD finery, controlling the alkalinity in residues to 1.4-1.8; adding ferrous sulfide in a LF furnace in batches for resulfurization, wherein, the ferrous sulfide addition of each batch accounts for 30-50 % of the total addition of ferrous sulfide; before adding each batch of ferrous sulfide, heating the temperature of the molten steel up to 1550-1570 DEG C, after adding each batch of ferrous sulfide, blowing argon into the steel ladle and stirring for 3-6 min, wherein, the argon intensity is 5-10 L / min.t; before casting the out-station molten steel, blowing argon into the steel ladle and stirring for 5-10 min, wherein, the argon intensity is 1.25-3.25 L / min.t. According to the method, the sulfur yield is increased to more than 65 % from less than 40% at present, and the deviation between the sulfur content in the out-station molten steel in the LF furnace and the sulfur content of a finished product is kept within 0.005 %.

Description

technical field [0001] The invention relates to a method for increasing the sulfur yield of stainless steel with high sulfur content, that is, a method for increasing the sulfur yield when smelting stainless steel with a carbon content of less than 0.08%. Background technique [0002] Most steels for mechanical structural parts need to be cut. In order to improve the cutting performance of the steel, increase the cutting speed, the life of the tool and the surface finish of the workpiece, it is necessary to add a certain amount of sulfur element to the steel to increase the sulfur content in the steel to form a free-cutting stainless steel. . [0003] The existing method for increasing the sulfur content in stainless steel is: before tapping the steel in the electric furnace, first add sulfur iron into the ladle, and cast it after being treated by the VOD refining furnace and the LF furnace. The yield of sulfur in this method is low, less than 40%, and the sulfur content is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/60C22C33/06C21C7/00
Inventor 张增武
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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