Method for producing continuous casting alloy steel containing S and Al

A production method and technology of alloy steel, applied to the improvement of process efficiency, furnace type, furnace, etc., can solve the problems of crystallizer liquid level fluctuation, poor pourability of molten steel continuous casting, nozzle blockage, etc., and achieve strong process applicability, The effect of low production cost and high billet yield

Inactive Publication Date: 2003-08-06
宝钢特钢有限公司
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Problems solved by technology

[0004] The production methods of S and Al alloy steels appeared at home and abroad as early as the 1990s. However, there has been no report on the production process technology data about continuous casting so far. understand blank
In recent years, domestic special steel companies have also begun to study the smelting and continuous casting technology of alloy steel containing S and Al. The following difficulties in the steelmaking process have plagued steelmakers: (1) Low oxygen (if the smelting atmosphere is high oxygen conditions, Then the Al alloy added to the steel can only act as a deoxidizer, but cannot enter the molten steel for microalloying-refining grains, and at the same time, the n

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[0034] specific implementation plan

[0035] A certain iron and steel company implements the patent of the present invention to produce one furnace of continuous casting alloy steel containing S and Al (Caterpillar Company 1E1813 track steel). . Shangyi process is 100 tons of direct current electric furnace primary refining (EBT tapping, silicon aluminum deoxidizer, recarburizer, various necessary ferroalloys, and adding refining slag) -- 100 tons of ladle furnace refining (bottom blowing argon) -- 100-ton vacuum furnace degassing--continuous casting: the first step, in the 100T DC electric furnace, feed DC current and input oxygen to melt the loaded charge into molten steel at a temperature range of 1640-1660 °C, EBT conventional When the steel is tapped to 30t, 280kg of SiAlFe deoxidizer is added, and then the required alloy is added. Only when the tapping amount is above 90t, 750kg of lime (containing CaO90%) and 120k of runner bricks (containing SiO 2 32%, Al 2 o 3 48%...

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Abstract

The production method of S and Al contained continuous casting alloy steel adopts four-step technological process: (1). smelting steel by using D.C. electric furnace; at the time of tapping (1640-1660 deg.C) adding proper quantity of SiAlFe deoxidant, carbon powder, alloy and slag material; (2) refining by using LF furnace, (a). adding lime (CaO is greater than or equal to 90%), SiFe and C powderin batches, making white slag and bottom blowing argon; (b). for boron-containing steel feeding Ti and retaining B, (c). top slag alkalinity is 2.8, Al2O3 content in the slag is 25%, regulating Al and S; (3) vacuum furnace treatment, its vacuum degree is less than or equal to 140 Pa, and treatment time is 20 min.; and (4) continuous pouring, its pouring speed is 320 kg/min.

Description

technical field [0001] The invention relates to a method for producing alloy steel in the metallurgical industry, in particular to a method for smelting and casting S and Al alloy steel. Background technique [0002] According to the different casting forms of high temperature molten steel, it can be divided into two types: mold casting and continuous casting. Die casting is to pour high-temperature molten steel into steel ingots, which are opened into billets by a roughing mill (or forging press), and the metal yield is low (about 84%); continuous casting is to pour high-temperature molten steel directly into billets, and the metal yield is low. Higher (about 98%). Therefore, the use of continuous casting technology to produce alloy steel can not only greatly increase the metal yield and reduce production costs, but also the development direction of contemporary metallurgical technology. [0003] As we all know: S element in steel is easy to produce sulfide inclusions, wh...

Claims

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Application Information

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IPC IPC(8): B22D11/00C21C5/52C21C7/00C22C38/00
CPCY02P10/20
Inventor 胡俊辉潘振球刘明华林俊
Owner 宝钢特钢有限公司
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