Silicon-calcium-magnesium-ferrous alloy used as steel-making deoxidizer

A ferroalloy and molten steel technology, applied in the field of ferroalloys, can solve the problems of insufficient deoxidation effect, low vapor pressure, waste of Ca elements, etc., and achieve the effects of excellent deoxidation capacity, low production cost, and easy production.

Inactive Publication Date: 2008-03-12
NINGBO HELANSHAN METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Ca element contained in this alloy has a low vapor pressure and is easy to oxidize. It is easy to react with iron oxide in the slag layer on the surface of molten steel and oxygen in the air. As a result, the yield of Ca element is only about 5%, which means A large amount of Ca is wasted uselessly, and a good deep deoxidation effect cannot be achieved
At the same time, the smoke generated by the combustion of Ca element deteriorates the production environment
[0005] (2) Although the above-mentioned disadvantages can be avoided by adding silicon-calcium alloys by using the method of silicon-calcium cored wires, it is necessary to make silicon-calcium alloys into powder to make cored wires, so that part of the silicon-calcium alloys will inevitably be lost.
In addition, adding silicon-calcium alloy cored wire to molten steel must use wire feeding machine equipment
However, the equipment is often prone to disconnection accidents during use, causing molten steel to be scrapped due to failure to complete deoxidation
In addition, due to the complexity of the production process of the cored wire, the cost increases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1 Preparation of silicon-calcium-magnesium-iron alloy used as steelmaking deoxidizer

[0019] Add 700 kg of clean steel scrap, 110 kg of magnesium metal, 800 kg of silicon-calcium alloy containing 30% calcium, and 800 kg of silicon-iron containing 75% silicon into the induction furnace for smelting. After full melting, 2380 kg of silicon-calcium-magnesium-iron alloy was obtained. After analysis, the composition of the alloy was found to be:

[0020] Si, 46.5%, Ca, 10.34%, Mg, 4.3%, Fe, 42%.

Embodiment 2

[0021] Example 2 Deoxidation experiment of high-speed rail steel

[0022] The alloy obtained in Example 1 was used for deoxidation of 900A steel. The number of experimental furnaces was 10 furnaces, and the amount of molten steel in each furnace was 100 tons. The consumption of the alloy was 80 kg / furnace. During the deoxidation process, no sparks of calcium combustion and white smoke of calcium oxide were seen on the liquid surface in the ladle. The average of 10 furnaces of T[0] in steel after deoxidation is 16.5PPm.

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Abstract

The invention provides a Si-Ca-Mg-Fe alloy for deoxidizing molten steel, which comprises Si 40-60%, Ca 10-15%, Mg 1-10% and Fe is more than or equal to 40%, the remainders are unavoidable foreign matters. As the alloy contains more Fe, the specific weight is high, so the utilization rate of deoxidizing element is improved; and as the alloy contains Mg, the desulfurizing and deoxidizing capability is improved. The alloy can finally deoxidize molten steel so that the T[O] of molten steel can be steadily less than 20 ppm.

Description

technical field [0001] The invention relates to an iron alloy, especially a silicon-calcium-magnesium-iron alloy used as a deoxidizer for steelmaking. Background technique [0002] With the advancement of science and technology, various fields of society have put forward higher requirements for the quality of steel, and the purity of the steel itself has a great impact on its mechanical properties, especially when the oxygen content in the steel is too high, it will seriously It affects the comprehensive mechanical properties of steel, so one of the important tasks of steelmakers is to remove oxygen from steel as much as possible, and choosing an appropriate deoxidizer is the main consideration of steelmakers for the deoxidation process. [0003] Silicon-calcium alloy is a strong deoxidizer for iron and steel smelting, mainly used in the final deoxidation of high-quality steel and special steel. This deoxidizer has a good deoxidation effect and can control the oxygen conten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06
Inventor 于跃华梁宇蕾侯作文
Owner NINGBO HELANSHAN METALLURGY
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