CN104195348A - Low-silicon and low-impurity pre-melting slag for electro-slag remelting and preparing method and application thereof - Google Patents
Low-silicon and low-impurity pre-melting slag for electro-slag remelting and preparing method and application thereof Download PDFInfo
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- CN104195348A CN104195348A CN201410476519.7A CN201410476519A CN104195348A CN 104195348 A CN104195348 A CN 104195348A CN 201410476519 A CN201410476519 A CN 201410476519A CN 104195348 A CN104195348 A CN 104195348A
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Abstract
The invention provides low-silicon and low-impurity pre-melting slag for electro-slag remelting through the optimal design of a formula scheme and a technical preparing method of pre-melting slag. The low-silicon and low-impurity pre-melting slag consists of 24-34% of F, 35-58% of Ca, 6-19% of Al, 0-3% of Mg, 10-26% of O and not more than 0.28% of Si in percentage by mass. The granularity is distributed between 0 and 15mm. The preparing method comprises the processing steps of mixing, electric furnace smelting, cooling, crushing, granularity sieving and aluminum foil vacuum packaging. The low-silicon electro-slag re-melting slag has low impurity content and even ingredients and can meet the electro-slag re-melting technical requirements of various high-temperature alloys and special steel, such as stainless steel.
Description
Technical field
The present invention relates to electroslag refining technical field, also relate to the preparation technology of the low impurity pre-melted slag of low silicon for the special steel grade esrs such as superalloy, stainless steel.
Background technology
In electroslag remelting process, consumable electrode refuse in liquid slag bath, produces the metallic substance with high cleanliness and uniform formation's structure by water mold.The liquid metal molten drop that consumable electrode end forms is by active liquid slag bath, and the impurity elements such as sulphur, oxygen and non-metallic inclusion are filtered and absorb by slag.After this, pure slag enters liquid metal bath, then according to solidification rate coagulation forming in water mold of controlling.Can find out, esr is the effective way of producing " high pure " steel, yet can the key that obtain high purity steel kind but at liquid slag charge purity.
At present, conventional remelting slag charge C, S, P, the foreign matter contents such as Fe are more and moisture is high, and the content of element silicon is more than 0.6% conventionally, and the cleanliness factor of the ESR ingot of producing is unstable, has seriously restricted the state of the art of high-end product.
Summary of the invention
Technical problem to be solved by this invention is by controlling silicone content, impurity content and the moisture in pre-melted slag, the low impurity of a kind of low silicon low-moisture esr pre-melted slag Composition Design scheme and preparation method are provided, promote the purity of the special steel ESR ingot such as superalloy and stainless steel, reach the international judgment criteria of inclusion.
In order to reach above object, the present invention realizes by the following technical solutions:
The low impurity pre-melted slag of low silicon for esr, is characterized in that, according to the mass percent of following chemical components, forms:
F:?24-34%,
Al:?6-19%,
Ca:?35-58%，
Mg:?0-3%，
O:?10-26%,
All the other are impurity :≤0.825%, and Si≤0.28% wherein, Fe≤0.23%, Ti≤0.18%, C≤0.03%, P≤0.015%, S≤0.03%, H2O (measuring at 650 ° of temperature)≤0.06%,
Size-grade distribution is at 0-15mm.
A preparation method for the low impurity pre-melted slag of low silicon for esr, comprises the following steps:
(1) according to mentioned component, require to prepare burden;
(2) adopt intermediate frequency furnace or electric furnace that above-mentioned batching is melted between 1300-1700 °, the time in 1.5-5 hour, and guarantee liquid slag charge evenly with clarification;
(3) through uniform liquid slag charge pour in metal die, carry out cooling;
(4) utilize the equipment such as crusher to carry out fragmentation and screening selection to cooled solid slag, guarantee that granularity is in 0-15mm;
(5) adopt aluminium foil vacuum packaging, standard is 15-25 kilogram/bag.
An application method for the low impurity pre-melted slag of low silicon for esr, is characterized in that, the low impurity pre-melted slag of above-mentioned low silicon can be applied to the esr of superalloy, stainless steel and other special steel kinds.
Compared with prior art, unusual effect of the present invention is: (1) this pre-melted slag Si content is less than 0.28%, belongs to low silicon remelting slag; (2) this pre-melted slag variable valency metal foreign matter content is low, Fe≤0.23%, Ti≤0.18%; (3) nonmetallic impurity content is low, C≤0.03%, P≤0.015%, S≤0.03%; (4) moisture content is low, H2O (measuring at 650 ° of temperature)≤0.06%; (5) size-grade distribution, between 0-15mm, adopts aluminium foil vacuum packaging, the stability of ensuring the quality of products.
The purity of electroslag ingot and weave construction all depend on chemical composition and the performance of slag charge, and in slag charge, the content of silicon is also one of important indicator affecting oxygen level in reflow process slag charge.Once the slag charge itself using contains more variable valency metal impurity and high Si content, electroslag ingot is difficult to guarantee final cleanliness factor.Otherwise appropriate remelting slag material formula is chosen in design, can optimize the quality of electroslag ingot.The remelting slag charge of high-quality has vital effect in esr process, is the key point of producing high-end ESR ingot.The present invention can significantly promote the cleanliness factor of special steel ESR ingot.
Embodiment
Below in conjunction with specific embodiment, the present invention will be further described:
Embodiment 1
The low impurity pre-melted slag of low silicon for esr, is comprised of according to mass percent following chemical composition: F:28.2%, Al:10.6%, Ca:42.6%, O:16.9%, Mg≤1.2%, Si≤0.28%, Fe≤0.23%, Ti≤0.18%, C≤0.03%, P≤0.015%, S≤0.03%, H2O (measuring at 650 ° of temperature)≤0.06%.
A preparation method for the low impurity pre-melted slag of low silicon for esr, comprises the following steps:
(1) according to mentioned component, require to prepare burden;
(2) adopt intermediate frequency furnace or electric furnace that above-mentioned chemical composition is formed to batching and melt between 1500 °, the time in 3 hours, and guarantee liquid slag charge evenly with clarification;
(3) through uniform liquid slag charge pour in metal die, carry out cooling;
(4) utilize the equipment such as crusher to carry out fragmentation and screening selection to cooled solid slag, guarantee that granularity is in 15mm;
(5) adopt aluminium foil vacuum packaging, standard is 15 kilograms/bag.
The low impurity pre-melted slag of above-mentioned low silicon can be applied to the esr of superalloy, stainless steel and other special steel kinds.
Embodiment 2
The low impurity pre-melted slag of low silicon for esr, is comprised of according to mass percent following chemical composition:
F:32.6%, Al:7.9%, Ca:45.8%, O:12.6%, Mg≤0.9%, Si≤0.28%, Fe≤0.23%, Ti≤0.18%, C≤0.03%, P≤0.015%, S≤0.03%, H2O (measuring at 650 ° of temperature)≤0.06%.
A preparation method for the low impurity pre-melted slag of low silicon for esr, comprises the following steps:
(1) according to mentioned component, require to prepare burden;
(2) adopt intermediate frequency furnace or electric furnace that above-mentioned chemical composition is formed to batching and melt between 1350 °, the time in 2 hours, and guarantee liquid slag charge evenly with clarification;
(3) through uniform liquid slag charge pour in metal die, carry out cooling;
(4) utilize the equipment such as crusher to carry out fragmentation and screening selection to cooled solid slag, guarantee that granularity is in 15mm;
(5) adopt aluminium foil vacuum packaging, standard is 15 kilograms/bag.
The low impurity pre-melted slag of above-mentioned low silicon can be applied to the esr of superalloy, stainless steel and other special steel kinds.
Embodiment 3
The low impurity pre-melted slag of low silicon for esr, is comprised of according to mass percent following chemical composition:
F:24.3%, Al:10.5%, Ca:45.0%, Mg:1.8%, O:17.8%, Si≤0.28%, Fe≤0.23%, Ti≤0.18%, C≤0.03%, P≤0.015%, S≤0.03%, H2O (measuring at 650 ° of temperature)≤0.06%.
A preparation method for the low impurity pre-melted slag of low silicon for esr, comprises the following steps:
(1) according to mentioned component, require to prepare burden;
(2) adopt intermediate frequency furnace or electric furnace that above-mentioned chemical composition is formed to batching and melt between 1600 °, the time in 4.5 hours, and guarantee liquid slag charge evenly with clarification;
(3) through uniform liquid slag charge pour in metal die, carry out cooling;
(4) utilize the equipment such as crusher to carry out fragmentation and screening selection to cooled solid slag, guarantee that granularity is in 10mm;
(5) adopt aluminium foil vacuum packaging, standard is 15 kilograms/bag.
The low impurity pre-melted slag of above-mentioned low silicon can be applied to the esr of superalloy, stainless steel and other special steel kinds.
At this, select a kind of esr of embodiment 2 preparations to carry out experiment test with the low impurity pre-melted slag of low silicon, can obtain a kind of esr prepared according to the methods of the invention and with the low impurity pre-melted slag of low silicon, produce the SUS403 of gained, its chemical composition is composed as follows:
C：≤0.15%，
Si:?≤0.5%，
Mn:?≤1.0%，
S:?≤0.030%，
P:?≤0.040%，
Cr:?11.50-13.00%，
Ni:?≤0.60%。
The SUS403 ESR ingot shown in the low impurity pre-melted slag production above of low silicon for a kind of esr that adopts the present invention to prepare, with reference to the inclusion international standard of ASTM E45, its inclusion rating result is as follows:
Be proven, adopt low silicon pre-melted slag prepared by the present invention to produce SUS403, its cleanliness factor is reached advanced world standards.
More than show and described ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and specification sheets, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in claimed interest field of the present invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof
.
Claims (9)
1. the low impurity pre-melted slag of low silicon for esr, is characterized in that, consists of: F 24-34%, Ca 35-58%, Al 6-19%, Mg 0-3%, O 10-26%, impurity≤0.825% following chemical element according to mass percent.
2. the low impurity pre-melted slag of low silicon for a kind of esr according to claim 1, is characterized in that, this pre-melted slag Si constituent content is less than 0.28%, belongs to low silicon remelting slag.
3. the low impurity pre-melted slag of low silicon for a kind of esr according to claim 1, is characterized in that, this pre-melted slag variable valency metal foreign matter content is low, Fe≤0.23%, Ti≤0.18%.
4. the low impurity pre-melted slag of low silicon for a kind of esr according to claim 1, is characterized in that, this pre-melted slag non-metallic element foreign matter content is low, C≤0.03%, P≤0.015%, S≤0.03%C≤0.03%, P≤0.015%, S≤0.03%.
5. the low impurity pre-melted slag of low silicon for a kind of esr according to claim 1, is characterized in that, this pre-melted slag moisture content is low, under measuring at 650 ° of temperature, and H2O≤0.06%.
6. the low impurity pre-melted slag of low silicon for a kind of esr according to claim 1, is characterized in that, described pre-melted slag size-grade distribution is between 0-15mm.
7. a preparation method for the low impurity pre-melted slag of low silicon for esr, is characterized in that, comprises the following steps:
(1) according to composition claimed in claim 1, require to prepare burden;
(2) adopt intermediate frequency furnace or electric furnace that above-mentioned batching is melted between 1300-1700 °, and guarantee that liquid slag charge is even and clarify, the time is in 1.5-5 hour;
(3) through uniform liquid slag charge pour in metal die, carry out cooling;
(4) utilize the equipment such as crusher to carry out fragmentation and screening selection to cooled solid slag, guarantee that granularity is in 0-15mm.
8. the preparation method of the low impurity pre-melted slag of low silicon for a kind of esr according to claim 7, is characterized in that, also comprises packaging process, and this pre-melted slag adopts aluminium foil vacuum packaging, and standard is 15-25 kilogram/bag.
9. an application method for the low impurity pre-melted slag of low silicon for esr, is characterized in that, a kind of esr claimed in claim 1 is applied to the esr of superalloy, stainless steel and other special steel kinds with the low impurity pre-melted slag of low silicon.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105039732A (en) * | 2015-08-17 | 2015-11-11 | 东北大学 | Preparing method of low-silicon pre-melted slag for electroslag remelting |
| CN105886791A (en) * | 2016-06-22 | 2016-08-24 | 四川六合锻造股份有限公司 | Method for preventing silicon increase in low-silicon steel during electroslag remelting |
| CN106493311A (en) * | 2016-11-10 | 2017-03-15 | 攀钢集团攀枝花钢铁研究院有限公司 | The production method of high-temperature corrosion-resistant alloy electrode ingot |
| CN115595403A (en) * | 2022-10-19 | 2023-01-13 | 姚鑫（Cn） | Automatic production method for premelted refining slag |
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| CN1560296A (en) * | 2004-03-12 | 2005-01-05 | 大连汇金泰高科技有限责任公司 | Process of minimizing alloy for enhancing high temp. strength and hot working plasticity of super alloy with nickle base |
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| CN102925712A (en) * | 2012-11-23 | 2013-02-13 | 重庆材料研究院 | Electroslag remelting method for difficult-processing high alloy stainless steel and electroslag remelting slag system adopting electroslag remelting method |
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| CN1560296A (en) * | 2004-03-12 | 2005-01-05 | 大连汇金泰高科技有限责任公司 | Process of minimizing alloy for enhancing high temp. strength and hot working plasticity of super alloy with nickle base |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105039732A (en) * | 2015-08-17 | 2015-11-11 | 东北大学 | Preparing method of low-silicon pre-melted slag for electroslag remelting |
| CN105886791A (en) * | 2016-06-22 | 2016-08-24 | 四川六合锻造股份有限公司 | Method for preventing silicon increase in low-silicon steel during electroslag remelting |
| CN105886791B (en) * | 2016-06-22 | 2018-07-24 | 四川六合锻造股份有限公司 | A method of prevent low-silicon steel from increasing silicon in electroslag remelting |
| CN106493311A (en) * | 2016-11-10 | 2017-03-15 | 攀钢集团攀枝花钢铁研究院有限公司 | The production method of high-temperature corrosion-resistant alloy electrode ingot |
| CN115595403A (en) * | 2022-10-19 | 2023-01-13 | 姚鑫（Cn） | Automatic production method for premelted refining slag |
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