CN120866716A - Preparation method of Ce-containing girder steel - Google Patents
Preparation method of Ce-containing girder steelInfo
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- CN120866716A CN120866716A CN202511085426.6A CN202511085426A CN120866716A CN 120866716 A CN120866716 A CN 120866716A CN 202511085426 A CN202511085426 A CN 202511085426A CN 120866716 A CN120866716 A CN 120866716A
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Abstract
本发明公开了一种含Ce大梁钢的制备方法，属于钢铁冶金技术领域。包括1)、针对试验钢种采用真空感应炉进行冶炼；2)、采用和大梁钢钢板作为原料；3)、使用高洁净度的CeFe合金；4)、将所有原料加入坩埚中进行冶炼，并保证在真空状态下进行；5)、在原料熔化后0.8‑1.5mi n，加入计算好的稀土铈铁合金；6)、保证稀土铈铁合金全部熔化后，在真空下浇铸；7)、检验冶炼完成钢种的化学成份，保证与目标成份相同或相近。本发明的目的是实现真空感应炉稳定控制钢中氧含量和Ce含量的目的，改善大梁钢中夹杂物类型、尺寸等，进而提升大梁钢钢材的综合性能。同时为工业生产稳定控制钢中稀土Ce含量提供技术支持。
This invention discloses a method for preparing Ce-containing beam steel, belonging to the field of iron and steel metallurgy technology. The method includes: 1) smelting the test steel grade using a vacuum induction furnace; 2) using beam steel plates as raw materials; 3) using a high-purity CeFe alloy; 4) adding all raw materials to a crucible for smelting, ensuring the process is carried out under vacuum; 5) adding a calculated rare-earth cerium-iron alloy 0.8-1.5 min after the raw materials have melted; 6) casting under vacuum after ensuring the rare-earth cerium-iron alloy has completely melted; and 7) inspecting the chemical composition of the smelted steel grade to ensure it is the same as or similar to the target composition. The purpose of this invention is to achieve stable control of oxygen and Ce content in steel using a vacuum induction furnace, improve the type and size of inclusions in beam steel, and thus enhance the overall performance of the beam steel. It also provides technical support for the stable control of rare-earth Ce content in steel during industrial production.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a preparation method of Ce-containing girder steel.
Background
In recent years, the application of rare earth in steel has been significantly advanced, and the action mechanism of rare earth in steel has been studied intensively and greatly advanced. The research and development and application of high-strength automobile girder steel plates are increasingly focused, and the steel market is urgent to need high-strength automobile steel plates with stable performance, so as to meet and cope with the domestic requirements of high-strength automobile girder steel, provide products with excellent stable performance, and gradually develop the high-strength automobile girder steel immediately following the international pace. The rare earth elements can improve the cleanliness of the steel, reduce the inclusion content in the steel and improve the comprehensive performance. Therefore, the research on the stable addition of rare earth elements in girder steel is an effective method.
The chinese patent application number 201210192278.4 discloses an improved method for preparing 30CrMnSi steel. Smelting by using a medium-frequency coreless induction furnace, taking steel as a main raw material, adding a proper amount of alloy such as ferrochrome, ferromanganese, ferrosilicon, ferroboron, rare earth and the like, alloying, casting into standard wedge-shaped and ladder-shaped test piece blanks by adopting clay sand and tide type, annealing the test piece, carrying out austenitizing treatment on the prepared 30CrMnSi steel at about 840 ℃ for 550-600 s, carrying out isothermal quenching or incomplete quenching at 180-300 ℃, carrying out heat preservation for 300-500 s, and quenching to room temperature to obtain the 30CrMnSi steel with good performance. The composite material has certain plasticity while maintaining high strength, and the comprehensive mechanical property is obviously improved compared with the traditional heat treatment process.
Chinese patent application number 202111603756.1 discloses a method for preparing die steel based on powder metallurgy. The method comprises the steps of cleaning and drying raw materials, weighing and proportioning the raw materials, atomizing inert gas to prepare powder, recovering separation gas, hot isostatic pressing and finish forging. The method has the advantages that when the die steel is prepared, inert gas atomization powder preparation and hot isostatic pressing technology are adopted, meanwhile, before the raw materials are melted and refined, the cleaning and drying processes are adopted to remove surface impurities, the precision of the die steel is improved, when the powder is collected, the separated gas can be recovered, the direct discharge is avoided, the waste is caused, and after the powder is collected, the die steel can be reused next time.
Chinese patent application number 201410753437.2 discloses a method for preparing 304 austenitic stainless steel with grain size smaller than 100 nm. The method comprises the steps of hot-rolling 304 austenitic stainless steel into a plate with the thickness of 4-5 mm, wherein the microstructure is austenitic, the grain size is 18-20 mu m, and the microstructure is uniform, and the 304 austenitic stainless steel with the grain size smaller than 100nm is prepared through three-stage cold rolling-annealing process treatment. And (3) carrying out mechanical property experiments on the experimental steel to finally obtain the stainless steel with the yield strength of 1100-1200 MPa, which is improved by nearly 5 times compared with the original yield strength, and the tensile strength is 1250-1350 MPa.
Disclosure of Invention
The invention aims to provide a preparation method of Ce-containing girder steel, which is used for producing high-cleanliness Ce-containing girder steel.
In order to solve the technical problems, the invention adopts the following technical scheme:
The invention relates to a preparation method of Ce-containing girder steel, which comprises the following steps of
1) Smelting the test steel by adopting a vacuum induction furnace;
2) Crushing the steel plate of the girder and the steel plate of the girder as raw materials, processing the steel plate into strips serving as furnace charges, stabilizing components and improving hit rate;
3) Calculating the addition amount of the rare earth cerium-iron alloy by using CeFe alloy with high cleanliness and combining target components with different Ce contents, and stably controlling the Ce content in the steel;
4) All raw materials are added into a crucible for smelting, and the smelting is ensured to be carried out in a vacuum state;
5) Adding the calculated rare earth cerium-iron alloy 0.8-1.5min after the raw materials are melted;
6) Ensuring that the rare earth cerium iron alloy is completely melted and then casting the alloy under vacuum;
7) And checking the chemical components of the smelted steel grade, and ensuring the same or similar to the target components.
Further, smelting is carried out by adopting a 25kg vacuum induction furnace.
Further, the furnace burden is processed into strips with the length of 25-35cm and the width of 2-4 cm.
Further, a long bar of 30cm in length and 3cm in width was processed as a charge.
Further, the high-cleanliness CeFe alloy has an O content of 80ppm and an S content of 25ppm.
Further, after the raw materials are melted for 1min, adding the calculated rare earth cerium-iron alloy.
Further, the smelting is ensured to be carried out in a vacuum state, and the vacuum degree is 80-100pa.
Compared with the prior art, the invention has the beneficial technical effects that:
According to the invention, aiming at the technical problems in the background, the vacuum induction furnace is adopted for test, the current CeFe alloy has the O content of 120ppm and the S content of 30ppm, the cleanliness is low, the impurity elements are more, and the purpose of controlling the Ce content more stably can be realized by using the high-cleanliness CeFe alloy. The oxygen content in the steel after the conventional CeFe alloy is added is up to 30ppm, the oxygen content of the CeFe alloy with high cleanliness is controlled to be 25ppm on average, the aim of stably controlling the oxygen content and the Ce content in the steel by a vacuum induction furnace is fulfilled, the types, the sizes and the like of inclusions in the girder steel are improved, and the comprehensive performance of the girder steel is further improved. Meanwhile, the method provides technical support for stably controlling the content of rare earth Ce in the steel in industrial production. The analysis method is simple and effective, low in cost and wide in application prospect.
Drawings
The invention is further described with reference to the following description of the drawings.
Fig. 1 shows the improvement result of rare earth Ce-containing girder steel inclusion.
Fig. 2 shows the comprehensive performance improvement result of the rare earth Ce-containing girder steel.
Detailed Description
Case 1:
1. the test steel grade is smelted by adopting a 25kg vacuum induction furnace, and the rare earth Ce content of the test steel grade is required to be 50ppm.
2. Smelting is carried out by adopting raw materials with the components similar to those of the target steel grade, and the specific components are shown in the following table.
3. The addition amount of the rare earth cerium-iron alloy is calculated to be 17g by combining the content and the yield of the rare earth cerium-iron alloy.
4. Ensuring that smelting is carried out in a vacuum state, and the vacuum degree is 90pa.
5. And adding rare earth cerium-iron alloy 1min after the raw materials are melted.
6. After heating for 2min, the alloy is ensured to be completely melted and then cast under vacuum.
7. The chemical components of the steel grade after smelting are inspected, wherein the O content is 24ppm, the rare earth Ce content is 54ppm, and the chemical components are basically the same as the designed target components.
Case 2:
1. the test steel grade is smelted by adopting a 25kg vacuum induction furnace, and the rare earth Ce content of the test steel grade is required to be 100ppm.
2. Smelting is carried out by adopting raw materials with the components similar to those of the target steel grade, and the specific components are shown in the following table.
3. The addition amount of the rare earth cerium-iron alloy is calculated to be 31.7g by combining the content and the yield of the rare earth cerium-iron alloy.
4. Ensuring that smelting is carried out in a vacuum state, and the vacuum degree is 90pa.
5. And adding rare earth cerium-iron alloy 1min after the raw materials are melted.
6. After heating for 2min, the alloy is ensured to be completely melted and then cast under vacuum.
7. The chemical components of the steel grade after smelting are inspected, wherein the O content is 26ppm, the Ce content is 110ppm, and the chemical components are basically the same as the designed target components.
The improvement effect on the inclusions is that the figure 1a is an inclusion morphology diagram of a blank sample, the size of the inclusions is larger and reaches more than 100um, the figure 1b is an inclusion morphology diagram of a first case, the inclusions are scattered and tiny, and the figure 1c is an inclusion morphology diagram of a second case, the inclusions are also scattered and tiny. The improvement effect of the inclusion is obvious.
FIG. 2 is a drawing showing the tensile properties of the blank, the first case and the second case, and the tensile strength, the yield strength and the elongation are all improved after rare earth is added.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (7)
1. A preparation method of Ce-containing girder steel is characterized by comprising the following steps of
1) Smelting the test steel by adopting a vacuum induction furnace;
2) Crushing the steel plate of the girder and the steel plate of the girder as raw materials, processing the steel plate into strips serving as furnace charges, stabilizing components and improving hit rate;
3) Calculating the addition amount of the rare earth cerium-iron alloy by using CeFe alloy with high cleanliness and combining target components with different Ce contents, and stably controlling the Ce content in the steel;
4) All raw materials are added into a crucible for smelting, and the smelting is ensured to be carried out in a vacuum state;
5) Adding the calculated rare earth cerium-iron alloy 0.8-1.5min after the raw materials are melted;
6) Ensuring that the rare earth cerium iron alloy is completely melted and then casting the alloy under vacuum;
7) And checking the chemical components of the smelted steel grade, and ensuring the same or similar to the target components.
2. The method for preparing Ce-containing girder steel according to claim 1, wherein the smelting is performed by using a 25kg vacuum induction furnace.
3. The process for preparing Ce-containing girder steel according to claim 1, wherein the steel is processed into a strip having a length of 25-35cm and a width of 2-4cm as a charge.
4. A process for preparing Ce-containing girder steel according to claim 3, wherein the steel is processed into a strip having a length of 30cm and a width of 3cm as a charge.
5. The method for producing Ce-containing girder steel according to claim 1, wherein the high-cleanliness CeFe alloy has an O content of 80ppm and an S content of 25ppm.
6. The method for producing Ce-containing girder steel according to claim 1, wherein the calculated rare earth cerium-iron alloy is added 1min after the melting of the raw materials.
7. The preparation method of the Ce-containing girder steel according to claim 1, wherein the smelting is performed in a vacuum state, and the vacuum degree is 80-100pa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202511085426.6A CN120866716A (en) | 2025-08-04 | 2025-08-04 | Preparation method of Ce-containing girder steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202511085426.6A CN120866716A (en) | 2025-08-04 | 2025-08-04 | Preparation method of Ce-containing girder steel |
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| CN120866716A true CN120866716A (en) | 2025-10-31 |
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| CN202511085426.6A Pending CN120866716A (en) | 2025-08-04 | 2025-08-04 | Preparation method of Ce-containing girder steel |
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- 2025-08-04 CN CN202511085426.6A patent/CN120866716A/en active Pending
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