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Low aluminum compound deoxidizer

A deoxidizer and aluminum composite technology, applied in the field of metallurgy, can solve the problems of inconvenient storage and transportation, excessive consumption of raw materials, and easy oxidation of alkali metals, etc., and achieve the effects of low cost, easy collision growth, and easy melting

Inactive Publication Date: 2015-04-08
SHANGHAI INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For composite deoxidizers containing alkali metals such as Al-Si-Ca, their deoxidation ability is very strong, but alkali metals are too easy to oxidize, the yield of elements is very low during the preparation of deoxidizers, and the consumption of raw materials is too large
Moreover, alkali metal deoxidizers are easy to absorb moisture in the air and become pulverized, which brings great inconvenience to storage and transportation.

Method used

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Embodiment 1

[0012] The composition of the Si-Al composite deoxidizer for stainless steel prepared according to the method of the present invention is 6%Al, 94%Si, and other elements are restricted as shown in Table 1.

[0013] The preparation method is as follows: use industrial silicon and industrial pure aluminum as raw materials, calculate the required raw materials according to the configuration requirements, melt them in an electric furnace, and then take them out of the furnace, and cast them into block deoxidizer ingots with different sizes according to the needs of users. In the deoxidation process of stainless steel and aluminum-killed steel, the deoxidizer is directly put into molten steel to complete the deoxidation process. The input amount is determined according to the initial oxygen content in molten steel and the amount of molten steel. The amount added is generally 0.5-2 kg / t molten steel.

[0014] Table 1: Composition list of Si-Al composite deoxidizer for stainless ste...

Embodiment 2

[0017] The composition of the Si-Al composite deoxidizer for stainless steel prepared according to the method of the present invention is 13% Al, 86% Si, and other elements are restricted as shown in Table 1.

[0018] The preparation method is the same as in Example 1.

Embodiment 3

[0020] The composition of the Si-Al composite deoxidizer for stainless steel prepared according to the method of the present invention is 16% Al, 84% Si, and other elements are restricted as shown in Table 1.

[0021] The preparation method is the same as in Example 1.

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Abstract

The invention relates to a low aluminum compound deoxidizer which is composed of 82%-95% by mass of silicon and 5%-18% by mass of aluminum. The invention also provides a preparation method of the low aluminum compound deoxidizer, according to the weight percentage, the silicon and the aluminum are weighed, the silicon and the aluminum are added into an electric furnace, the electric furnace temperature is risen to 1450 to 1550 DEG C, the silicon and the aluminum are smelted in the electric furnace, the smelting time is 2-5 hours, then the silicon and the aluminum are discharged for casting of a massive deoxidizer ingot. The low aluminum compound deoxidizer solves the water gap clogging problem in the process of continuous casting, caused by use of a high aluminum content deoxidizer in the prior art for deoxidization of stainless steel and aluminum killed steel and other steel.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a deoxidizer, especially a low-aluminum composite deoxidizer. Background technique [0002] At present, most of the final deoxidizers used in stainless steel smelting are Fe-Si-Al composite deoxidizers, pure aluminum deoxidizers or deoxidizers containing alkali metals, such as Al-Si-Ca alloys. [0003] Stainless steel is deoxidized by a deoxidizer with high Al content, and a large amount of Al will be produced in molten steel 2 o 3 , aluminate, aluminum chromium and aluminum magnesium spinel inclusions, these hard and brittle non-deformable inclusions are the main reasons for shortening the fatigue life of stainless steel and reducing fatigue strength and surface quality. Using a deoxidizer with high aluminum content for final deoxidation, due to insufficient reduction or insufficient time, the reduction products will not have time to float up, which will affect the puri...

Claims

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Application Information

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IPC IPC(8): C21C7/06
Inventor 李金光陈建斌栾怀壮陈麒忠胡继业邱仁杰疏伟
Owner SHANGHAI INSTITUTE OF TECHNOLOGY
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