Method for preparing composite deoxidant silicon aluminium barium calcium manganese iron ally used for steel making

A composite deoxidizer, silicon aluminum barium calcium technology, applied in blast furnace parts, blast furnaces, furnace types, etc., can solve the problems of unsatisfactory grain refinement, difficulty in accurate control of alloys, poor dephosphorization effect, etc., to prevent powder Chemical and spontaneous combustion, large specificity, and reduced burning loss

Inactive Publication Date: 2006-11-15
陈恩泽
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some aluminum content is still very high (30-40%), and some grain refinement is not ideal
Some are easy to pulverize, have poor desulfurization and dephosphorization effects, and most deoxidizer manufacturers use submerged arc furnaces for production, because the one-time production cost of submerged arc furnaces is low, but the composition of the alloy is difficult to control accurately, often Can't achieve the expected effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Described alloy chemical composition (weight %) is: Si 32%, Al 10%, Ba 9%, Ca 9%, Mn6.5%, the rest is iron, and various alloy particle sizes are 20~50mm, and various alloy particle sizes It is 20-50mm.

[0022] Its preparation method is:

[0023] According to 33 kg of silicon-calcium alloy (Ca28%, Si 50%), 35 kg of silicon-barium alloy (Ba 27%, Si 46%), 9 kg of medium-carbon ferromanganese (Mn 77%), and 95-98% aluminum content 11 kg of aluminum ingots and 12 kg of scrap steel are mixed together in a 1.5 ton industrial frequency furnace for melting. Carbon ferromanganese and ferrosilicon alloys are heated and melted, and then the remaining industrial aluminum ingots are added after they are completely melted. After being fully stirred and melted, they are cast out of the furnace, and after cooling, they are further broken to 20-50mm, and the chemical composition (weight %) is: : Si 32%, Al 10%, Ba 9%, Ca 9%, Mn 6.5%, the rest is a composite deoxidizer of iron - silicon...

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Abstract

The invention relates to a composite deoxidizer for steelmaking-silicon-aluminum-barium-calcium-manganese-ferroalloy and a preparation method thereof, belonging to the technical field of steelmaking. The chemical composition (% by weight) of the composite deoxidizer for steelmaking is: 10-35% of Si, 5-15% of Al, 4-14% of Ba, 4-14% of Ca, 2-10% of Mn, and the balance For Fe and unavoidable impurities. The preparation method is as follows: use an intermediate frequency furnace or a power frequency furnace, take a certain proportion of scrap steel and 3 / 2 aluminum ingots and put them into the bottom of the furnace, then add silicon-barium alloy, silicon-calcium alloy, medium-carbon ferromanganese, and ferrosilicon alloy. Add the rest of the aluminum ingots after all the melting, fully stir and melt, and then get out of the furnace to obtain the composite deoxidizer for steelmaking with the required chemical composition—silicon-aluminum-barium-calcium-manganese-ferroalloy. The deoxidizer has specific gravity (3.5~4.5g / cm 3 ), low melting point (1050-1200°C), fine and hard crystallization, especially when using this composite deoxidizer when smelting low-alloy structural steel and carbon steel, it can effectively improve the comprehensive performance of steel.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a composite deoxidizer for steelmaking-silicon-aluminum-barium-calcium-manganese-ferroalloy and a preparation method thereof. Background technique [0002] The process of steelmaking is the process of decarburizing molten iron and removing harmful impurities such as phosphorus and sulfur by blowing oxygen or adding oxidants. The progress of this process, although the pig iron is smelted into steel, the [O] content in the steel increases. Especially like IF steel, in order to make the carbon content reach 0.02-0.03%, the oxygen in the steel will increase to 0.08-0.1%. [O] generally exists in the form of [FeO] and its oxides in molten steel. If it cannot be purified in time before casting the slab, it will affect the fatigue characteristics, processing performance, ductility, toughness, welding performance and HIC resistance of steel. , corrosion resistance, etc. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C22C30/00C22C38/06C22C33/04C21B7/06
Inventor 陈恩泽
Owner 陈恩泽
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