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Molten steel smelting technology for preventing nozzle clogging during sulfur-containing aluminium-containing steel pouring process

A technology for molten steel smelting and reclaimed water, which is applied in the field of special steel metallurgy to eliminate the problem of nodule at the nozzle, ensure smooth production, and improve the cleanliness of molten steel.

Active Publication Date: 2016-11-09
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a molten steel smelting process for preventing nodules in the pouring process of sulfur-containing and aluminum-containing steel. By increasing the sulfur content of the slag, the reaction between the molten steel and the slag is suppressed during the vacuum treatment process, and the yield rate and the yield of the sulfur element are improved. The cleanliness of molten steel solves the problem of nodules in pouring sulfur-containing and aluminum-containing steel nozzles

Method used

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  • Molten steel smelting technology for preventing nozzle clogging during sulfur-containing aluminium-containing steel pouring process
  • Molten steel smelting technology for preventing nozzle clogging during sulfur-containing aluminium-containing steel pouring process

Examples

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Embodiment 1

[0028] In this embodiment, LD converter smelting-LF refining-VD vacuum refining-continuous casting billet forming process route is used to produce 42CrMoS sulfur-containing steel, and the mass percentages of various components of 42CrMoS sulfur-containing steel are: C: 0.40%-0.43%, Si: 0.24 %-0.30%, Mn: 0.77%-0.83%, P<0.015%, S: 0.020%-0.32%, Cr: 1.0%-1.1%, Mo: 0.21%-25%, Al: 0.020%-0.32%.

[0029] The molten iron is directly put into the converter for smelting without desulfurization, and the final sample of the converter is analyzed by spectrum, and the sulfur content is 0.026%-0.035%. The steel output of the converter is 85.8t. During the tapping process, 100kg-120kg of aluminum cake and 360kg of ferrosilicon are added for deoxidation alloying, 395kg-412kg of lime and 97kg-103kg of pre-melted refining slag are added for slagging, and the CaO content of pre-melting refining slag 37.6%, Al 2 o 3 The content is 49.2%.

[0030] The total weight of LF refining slag to the sta...

Embodiment 2

[0039] In this embodiment, the LD converter smelting-LF refining-RH vacuum refining-continuous casting billet forming process route is used to produce F45MnVS sulfur-containing steel, and the mass percentages of various components of F45MnVS sulfur-containing steel are: C: 0.43%-0.46%, Si: 0.35 %-0.45%, Mn: 1.30%-1.48%, P<0.025%, S: 0.035%-0.055%, Cr: 0.15%-0.025%, V: 0.09%-0.012%, Al: 0.010%-0.025%, N: 0.009%-0.013%.

[0040] The molten iron is directly smelted in the converter without desulfurization, and the final sample of the converter is analyzed by spectrum, and the sulfur content is 0.025%-0.033%. The steel output of the converter is 86.9t. During the steel tapping process, 80kg-110kg of aluminum cake and 540kg of ferrosilicon are added for deoxidation and alloying, and 346kg-453kg of lime and 98kg-103kg of pre-melted refining slag are added for slagging. CaO in the pre-melting refining slag The content is 41.6%, Al 2 o 3 The content is 53.1%.

[0041] The total we...

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Abstract

The invention relates to a molten steel smelting technology for preventing nozzle clogging during sulfur-containing aluminium-containing steel pouring process. The molten steel smelting technology comprises the steps of converter or electric furnace steelmaking, LF steel ladle refining, VD or RH vacuum refining, and continuous steel casting. According to the molten steel smelting technology, molten iron without desulfuration is directly supplied to a converter or an electric furnace for steelmaking, and iron sulfide powder is added into slag in the later period of LF steel ladle refining, so that the content of sulfur elements in the slag is increased, the reaction between the molten steel and the slag is inhibited during the vacuum treatment process, the loss amount of S elements in the molten steel is decreased, Al2O3 inclusions and CaS inclusions which are liable to cause nozzle clogging are reduced, the problem of nozzle clogging can be eliminated, the production is guaranteed to be smoothly carried out, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of special steel metallurgy, in particular to a molten steel smelting process for preventing nodules from forming in the pouring process of sulfur-containing and aluminum-containing steel. Background technique [0002] In order to reduce the oxygen content of molten steel, special steel enterprises generally add aluminum elements to molten steel to strengthen deoxidation, and the deoxidation product is mainly Al 2 o 3 Inclusions, such inclusions are one of the main sources of nozzle nodules. Calcium treatment is resolved by Al 2 o 3 The main method of nozzle nodulation caused by inclusions, but for some steel types that require sulfur content, inappropriate calcium treatment can easily lead to the formation of CaS inclusions, and CaS inclusions are also likely to cause nozzle nodulation. [0003] At present, the production of sulfur-containing and aluminum-containing steel generally adopts the smelting p...

Claims

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Application Information

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IPC IPC(8): C22C33/04C21C7/00C21C7/06C21C7/10C22C38/18C22C38/04C22C38/02C22C38/12C22C38/06C22C38/60
CPCC21C7/0006C21C7/0037C21C7/0087C21C7/06C21C7/10C22C33/04C22C38/02C22C38/04C22C38/06C22C38/12C22C38/18C22C38/60
Inventor 周力马建超刘从德邹长东翟万里
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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