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Drainage agent for refining in three phases and preparation method thereof

A technology of drainage agent and three-step method, which is applied to casting equipment, manufacturing tools, metal processing equipment, etc., can solve the problems of low pouring rate, inclusion, and low refractoriness of drainage agent, and achieve reasonable composition, large specificity, Moderate specific gravity and refractoriness

Active Publication Date: 2008-05-28
HENAN TONGYU METALLURGY MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the temperature of molten steel in the smelting process of stainless steel is higher than that of other steel types, coupled with the special refining process and long refining time, the current pouring rate of the drainage agent used for three-step refining is relatively low. And at the same time, there is also the problem of low refractoriness and easy introduction of inclusions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take 55 parts of chrome sand (0.2-0.8mm), 18 parts of quartz sand (0.5-1.2mm), 12 parts of quartz sand (0.5-0.9mm), 10 parts of zircon sand (0.5-1.2mm), feldspar sand ( 0.5-1.2mm) 4 parts, 400 mesh graphite 0.8 parts, first mix quartz sand, zircon sand, feldspar sand evenly, then add graphite, chrome ore sand and stir evenly, then dry at 85°C until the water content is 0.1 %the following. Among them, the active ingredient percentage content is Cr 2 o 3 25.36%, SiO 2 32.26%, Zr 2 o 3 9.15%. The prepared drainage agent was used in Shanghai Baosteel's three-step refining of 409L and TCS 345 steels. The refining time was as long as 5 hours, and the self-opening rate was 76.2%, which was 36.2 percentage points higher than the self-opening rate of imported sand from South Korea.

Embodiment 2

[0018] Take 65 parts of chrome sand (0.2-0.63mm), 15 parts of quartz sand (0.5-1.2mm), 12 parts of quartz sand (0.5-0.9mm), 12 parts of zircon sand (0.5-1.2mm), feldspar sand ( 0.5-1.2mm) 6 parts, 400 mesh graphite 1.2 parts, first mix quartz sand, zircon sand, feldspar sand evenly, then add graphite, chrome ore sand and stir evenly, then dry at 100°C until the water content is 0.1 %the following. Among them, the active ingredient percentage content is Cr 2 o 3 29.9%, SiO 2 29.82%, Zr 2 o 3 10.8%. The prepared drainage agent is used in three-step refining stainless steel, the refining time is more than 4 hours, and the self-opening rate is 95%.

Embodiment 3

[0020] Take 75 parts of chrome sand (0.2-0.7mm), 12 parts of quartz sand (0.5-1.2mm), 15 parts of zircon sand (0.5-1.2mm), 3 parts of feldspar sand (0.5-1.2mm), and 400 mesh graphite 0.8 parts, first mix quartz sand, zircon sand, and feldspar sand evenly, then add graphite and chrome ore sand in turn, stir evenly, and then dry at 100°C until the water content is below 0.1%. Among them, the active ingredient percentage content is Cr 2 o 3 34.5%, SiO 2 13.08%, Zr 2 o 3 13.6%. The prepared drainage agent was used for three-step refining stainless steel, the refining time was as long as 3 hours, and the self-opening rate was 97%.

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Abstract

The invention relates to a flow guiding agent used for a three-step refining and a preparation method thereof. The flow guiding agent mainly consists of the components with the following weight percentages: 23 to 35 percent of Cr2O3, 13 to 45 percent of SiO2 and 3 to 15 percent of Zr2O3. The forming of the granularity of the flow guiding agent is reasonable and the flowing capability is good; the refractory degree is not less than 1780 DEG C and agglomeration can be resisted; the capability of steel liquid penetration resisting is strong and the specific gravity is high; a proper thickness of an agglomeration layer can be formed and the self-opening rate of a steel bundle can be effectively enhanced; the component composing is reasonable and impurities brought into a casting-start process can be avoided. The invention is suitable for the manufacturing of high clean steels.

Description

(1) Technical field [0001] The invention relates to a drainage agent for three-step refining and a preparation method thereof. (2) Background technology [0002] Drainage agent is a refractory material with high temperature resistance and strong corrosion resistance. It is used for ladle pouring in the smelting process, which can improve the quality of molten steel itself and reduce the cost per ton of steel. The three-step method of refining stainless steel generally refers to the use of electric furnace LF+VD+VOD three-step method to smelt stainless steel. In this process, the drainage agent is required to have super refractoriness, resistance to molten steel erosion, resistance to molten steel penetration and reasonable sintered layer thickness. Because the temperature of molten steel in the smelting process of stainless steel is higher than that of other steel types, coupled with the special refining process and long refining time, the current pouring rate of the drainag...

Claims

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Application Information

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IPC IPC(8): B22D41/48B22D41/54
Inventor 王庆来楚永法葛垠杨玉芹刘国旺武金波陈玉设
Owner HENAN TONGYU METALLURGY MATERIALS GRP
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