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Technology for producing ultralow-sulfur steel with steel ladle as refining furnace

A production method, ultra-low sulfur technology, applied in the field of metal production or refining, to achieve the effects of prolonging the desulfurization time, high desulfurization efficiency, and simplifying the desulfurization process

Inactive Publication Date: 2004-05-26
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

But at present this method is only used for the addition of metal powder

Method used

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Embodiment Construction

[0012] The best process of the present invention is as follows: before the start of refining, the composition of molten steel smelted by the primary smelting furnace is qualified, the initial sulfur content is about 0.010%, the temperature is controlled at 1600-1620°C, and the surface of the molten steel is covered with molten steel of high quality. 0.6-1.0% conventional refining slag (representative composition by mass percentage: CaO: MgO: Al 2 o 3 : SiO 2 :CaF 2 =60:10:15:8:7), at the beginning of refining, feed (10-15%) BaO, (70-80%) CaO, (8-15%) CaF into the steel drum 2 cored wire. During the refining process of molten steel in the refining furnace, the desulfurization dose of wire feeding is 6-10Kg / t steel, the wire feeding speed is controlled at 0.15-0.30Kg / t steel min, and the refining time is 15-35 minutes, which can reduce the sulfur content of molten steel From 0.010% to less than 0.001%. Feed silk can be fed all at once, after feeding, there should be 3 to 5 ...

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Abstract

A technology for producing ultralow-sulfur steel with steel ladle as refining furnace features that the efficient non-metal desulfurizing powder is used to make cored wire, and the cored wire is fed into molten steel while inertial gas is brown into it from the bottom of steel ladle to stir the molten steel for speeding up the desulfurizing reaction. Said desulfurizing powder contains BaO (5-40 mass%), CaO (50-80) and CaF2 (8-15). After refining the steel for 15-35 min, the sulfur content is reduced from 0.01% to 0.001%.

Description

technical field [0001] The invention belongs to the production or refining of metals Background technique [0002] Ultra-low sulfur steel is one of the important research topics for metallurgists. In the desulfurization process, the most traditional method is to use the reaction between the refining covering slag and molten steel to remove sulfur in the steel. This method is simple and practical, but the refining time is long and the desulfurization efficiency is low. Sulfur was reduced to low levels ([%S]<0.005). At present, the method widely used to effectively remove sulfur in steel is to use inert gas as carrier gas to spray desulfurizer into molten steel. [1，2] (1]. T. Hatakeyama, Y. Mizukami, K. Lga and M. Oita: Development of a New Secondary Refining Process Using an RH Vacuum Degasser, I & SM, 1989, July 23-29; [2] Ryoji TSUJINO etc: Behavior of Desulfurization in Ladle Steel Refining with Powder Injection at Reduced Pressures, ISIJ International, 1989, Vol.29,...

Claims

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Application Information

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IPC IPC(8): C21C7/064
Inventor 成国光陆钢宋波王新华赵沛王玉刚王林英
Owner UNIV OF SCI & TECH BEIJING
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