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High chromium alloy steel crucible for magnesium smelting and preparation method thereof

A technology for smelting alloy steel and magnesium, which is applied in the field of high-chromium alloy steel crucibles for magnesium smelting and its preparation, and can solve problems such as complex processes, affecting the related performance of magnesium and magnesium alloy products, and poor high-temperature oxidation resistance

Active Publication Date: 2020-10-27
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Magnesium and magnesium alloy smelting crucible is a high-temperature service part, and the long-term working temperature is about 900°C. During this process, the molten magnesium and magnesium alloy solution will have a strong corrosion effect on the crucible material. The crucible material and The magnesium alloy liquid will diffuse and pollute the magnesium liquid, which will seriously affect the related performance of subsequent magnesium and magnesium alloy products
[0003] Alloy steel has the characteristics of high temperature strength, high temperature oxidation resistance, and strong corrosion resistance. However, the existing crucibles for single metal smelting are generally made of carbon steel materials. Although they will not pollute the magnesium liquid, their high temperature oxidation resistance is also high. Poor, easy to oxidize and peel off at around 800°C, resulting in short life and poor reliability of the crucible
Other bimetal compound refining pots have better performance, but the process is too complicated

Method used

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  • High chromium alloy steel crucible for magnesium smelting and preparation method thereof

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preparation example Construction

[0018] A method for preparing a high-chromium alloy steel crucible for magnesium smelting. Steel scrap is added to an intermediate frequency induction furnace, and after melting, raw materials such as pig iron, Co block, ferrosilicon, ferromanganese, and low-carbon ferrochrome are added in order to obtain a crucible whose composition meets the requirements. High chromium alloy steel, for purification, the purification temperature is 1520~1560℃, argon gas is blown into the bottom of the ladle, the duration is 0.5~2.0 minutes, the pressure is 2.0×10 4 ~5.0×10 4 MPa, after the argon blowing is completed, the pouring temperature of the molten steel is not lower than 1480°C, the impurities are discharged, and the crucible is made by integral casting by the lost foam casting process.

[0019] The service life of the steel is relatively high, the room temperature hardness of the obtained steel is greater than 59.6HRC, and the high temperature strength at 900°C is above 380MPa.

[00...

Embodiment 1

[0023] The ingredients are weighed according to the target composition, and the weighed steel scrap is added to the intermediate frequency induction furnace. After melting, an appropriate amount of pig iron, Co block, ferrosilicon, ferromanganese, and low-carbon ferrochrome are added in sequence for purification. The purification temperature is 1520°C , argon gas was blown into the bottom of the ladle, the duration was 2.0 minutes, and the pressure was 5.0×10 4 MPa, pouring temperature is 1480°C, impurities are discharged in the form of slag, sampling analysis and adjustment of alloy composition (weight percentage) to contain C: 0.52, Si: 1.71, Mn: 3.98, Cr: 18.74, Co: 0.8, the rest is iron, After the alloy composition meets the requirements, the finished crucible is cast as a whole by the lost foam casting process.

[0024] According to the test, the high temperature strength of the crucible is 416MPa at 900°C, and the service life can reach 88 days, which is about 60% higher...

Embodiment 2

[0026] The ingredients are weighed according to the target composition, and the weighed steel scrap is added to the intermediate frequency induction furnace. After melting, an appropriate amount of pig iron, Co block, ferrosilicon, ferromanganese, and low-carbon ferrochrome are added in turn for purification. The purification temperature is 1530°C , argon gas was blown into the bottom of the ladle for 1.5 minutes at a pressure of 4.0×10 4 MPa, pouring temperature is 1490°C, impurities are discharged in the form of slag, sampling analysis and adjustment of alloy composition (weight percentage) to contain C: 0.6, Si: 2.1, Mn: 4.18, Cr: 20.53, Co: 0.95, the rest is iron, After the alloy composition meets the requirements, the finished crucible is cast as a whole by the lost foam casting process.

[0027] According to the test, the high temperature strength of the crucible is 403MPa at 900°C, and the service life can reach 82 days, which is about 50% higher than that of the butt w...

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Abstract

The invention discloses a high-chromium alloy steel crucible for magnesium smelting and a preparation method of the high-chromium alloy steel crucible. The crucible is cast by a casting process, and comprises the following components in percentage by weight: 0.4-0.6% of C, 1.4-2.1% of Si, 3.8-4.2% of Mn, 12-21% of Cr, 0.2-1.0% of Co, less than 0.02% of S, less than 0.02% of P and the balance of Fe. Compared with other alloy steel crucibles, the high-chromium alloy steel crucible disclosed by the invention has low cost, the process of the crucible disclosed by the invention is simpler than thatof a bimetallic compound crucible, and the crucible disclosed by the invention has excellent high temperature oxidation resistance.

Description

technical field [0001] The invention belongs to the technical field of metal smelting, and in particular relates to a high-chromium alloy steel crucible for magnesium smelting and a preparation method thereof. Background technique [0002] Magnesium alloys have excellent properties such as high specific strength, good shock absorption, and good machinability. They can be widely used in aviation, aerospace, automobiles, machinery and construction industries. Higher requirements are also proposed for the smelting of magnesium and magnesium alloys. Require. Magnesium and magnesium alloy smelting crucible is a high-temperature service part, and the long-term working temperature is about 900°C. During this process, the molten magnesium and magnesium alloy solution will have a strong corrosion effect on the crucible material. The crucible material and The magnesium alloy liquid will diffuse and pollute the magnesium liquid, which will seriously affect the related performance of s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/30C22C38/38C22C38/34F27B14/00
CPCC22C38/02C22C38/30C22C38/34C22C38/38F27B14/00
Inventor 刘同雨皇志富刘志伟郑巧玲
Owner XI AN JIAOTONG UNIV
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