CN115216586B - Smelting method of steel for cold roll - Google Patents
Smelting method of steel for cold roll Download PDFInfo
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- CN115216586B CN115216586B CN202210606934.4A CN202210606934A CN115216586B CN 115216586 B CN115216586 B CN 115216586B CN 202210606934 A CN202210606934 A CN 202210606934A CN 115216586 B CN115216586 B CN 115216586B
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- slag
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- deoxidization
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a smelting method of cold roll steel, which belongs to the technical field of roll manufacturing, and comprises the following steps: when the electric furnace is tapped to a ladle refining furnace, 3-6 kg/t of refining slag and 1.8-2.2 kg/t of silicon-aluminum-barium are added along with the flow for pre-deoxidization so as to cover molten steel by rapid slag formation; after ladle refining furnace seat package, power transmission and slag making, adding 3-5 kg/t of calcium alloy deoxidizer for deoxidization, consolidating white slag according to furnace atmosphere, adding calcium alloy deoxidizer or carburant for deoxidization in batches at intervals of 10-15 minutes, and adding 0.5-1 kg/t of silicon-calcium alloy for final deoxidization after refining; the invention can improve the form of the steel carbide for the cold roller by adding the rare earth modifier under the condition of sufficient deoxidation, and the generated carbide is relatively dispersed and fine, thereby preventing and reducing the formation of massive eutectic carbide, further refining grains and improving the structure and performance of the roller.
Description
Technical Field
The invention relates to the technical field of roller manufacturing, in particular to a smelting method of steel for a cold roller.
Background
With the development of the cold rolling mill in the direction of large-scale, high-speed and continuous, the cold rolling mill also has higher requirements on the cold rolling rolls directly involved in rolling. The development aim of the cold roll is to further prolong the rolling period, reduce the influence of rolling accidents on the roll, and simultaneously improve the wear resistance and the roughness maintenance capability so as to continuously improve the efficiency of the rolling mill and ensure the surface quality and the plate type quality of the cold-rolled strip steel. The improvement of the cold roll performance is required to be achieved by changing the material of the roll and optimizing the manufacturing technology, and the trend of the material development is to widely use alloy elements and gradually improve the alloying degree. The cold roll steel belongs to high-carbon tool steel, the alloy content is increased, the precipitation tendency of liquid-out carbide is increased, the form of carbide is deteriorated, the fatigue resistance of the roll is greatly reduced by massive liquid-out carbide, and the rolling period is shortened.
The unique chemical adsorption of the heavy rare earth yttrium serving as an active element is that most of yttrium is enriched around carbide, so that carbide forming elements are prevented from diffusing into austenite, nucleation particles during molten steel solidification can be greatly increased as an modifier, and eutectic carbide which is precipitated first is formed and grown by taking the particles as cores. Meanwhile, the atomic radius of the heavy rare earth yttrium is smaller and is preferentially distributed on the grain boundary, so that the solid solution strengthening effect in the steel is larger, the interaction between the grain boundary and the low-melting-point harmful elements is realized, the segregation of the heavy rare earth yttrium on the grain boundary is restrained, the grain boundary is purified and strengthened, and the deformed austenite recrystallization and the austenite grain growth are restrained. Because the quantity of nucleation points is more, the generated carbide is relatively dispersed and fine, and the formation of massive eutectic carbide is prevented and reduced, so that grains are refined, and the structure and performance of the steel for the cold roll are improved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a smelting method of steel for cold rolls, which can improve the form of carbide of the steel for cold rolls, the generated carbide is relatively dispersed and fine, the formation of massive eutectic carbide is prevented and reduced, grains are further refined, and the structure and performance of the rolls are improved.
In order to solve the technical problems, the invention adopts the following technical scheme:
when the electric furnace is tapped to a ladle refining furnace, 3-6 kg/t refining slag and 1.8-2.2 kg/t silicon aluminum barium are added along with the flow for pre-deoxidization so as to cover molten steel rapidly; after ladle refining furnace seat package, power transmission and slag making, adding 3-5 kg/t of calcium alloy deoxidizer for deoxidization, consolidating white slag according to furnace atmosphere, adding calcium alloy deoxidizer or carburant for deoxidization in batches at intervals of 10-15 minutes, and adding 0.5-1 kg/t of silicon-calcium alloy for final deoxidization after refining; adding rare earth modifier under deoxidization.
The technical scheme of the invention is further improved as follows: the refining slag is CaO-Al2O3 slag system.
The technical scheme of the invention is further improved as follows: the rare earth modifier consists of Y25-40 wt%, si 35-50 wt% and Fe 12-30 wt%.
The technical scheme of the invention is further improved as follows: the addition amount of the rare earth modifier is 0.5-1.0 kg/t.
By adopting the technical scheme, the invention has the following technical progress:
1. according to the invention, the rare earth modifier is added when molten steel is smelted to the steel for the cold roll, so that the nucleation points are increased when the molten steel is solidified, the generated carbide is relatively dispersed and fine, the formation of massive eutectic carbide is prevented and reduced, grains are further refined, and the structure and performance of the steel for the cold roll are improved.
2. According to the invention, yttrium-based rare earth is added under the condition of good deoxidization, so that the yttrium-based rare earth plays a role of a modifier, the solid solution amount in steel is increased, segregation of phosphorus and sulfur and low-melting-point impurities in the grain boundary can be inhibited by the segregation of the yttrium-based rare earth in the grain boundary, the harmful effect of the low-melting-point impurities is eliminated, the grain boundary is purified and strengthened, the formation and the expansion of inter-crystal cracks are hindered, and the plasticity of the material is improved; the heavy rare earth yttrium belongs to active rare earth elements, has smaller atomic radius, has stronger chemical adsorption effect and deoxidation and desulfurization effect, so that the molten steel is deoxidized before the rare earth is added, high-alkalinity refining slag is added during electric furnace tapping, the molten steel is covered by rapid slag formation, and the pre-deoxidation is performed by adopting silicon aluminum barium; adding a calcareous alloy deoxidizer for deoxidizing in the initial refining stage, and then adding the deoxidizer in batches after white slag is formed.
Detailed Description
The invention is further illustrated by the following examples:
when the electric furnace is tapped to a ladle refining furnace, 3-6 kg/t refining slag and 1.8-2.2 kg/t silicon aluminum barium are added along with the flow for pre-deoxidization so as to cover molten steel rapidly; after ladle refining furnace seat package, power transmission and slag making, adding 3-5 kg/t of calcium alloy deoxidizer for deoxidization, consolidating white slag according to furnace atmosphere, adding calcium alloy deoxidizer or carburant for deoxidization in batches at intervals of 10-15 minutes, and adding 0.5-1 kg/t of silicon-calcium alloy for final deoxidization after refining; adding rare earth modifier under deoxidization.
The refining slag is CaO-Al2O3 slag system.
The rare earth modifier consists of Y25-40 wt%, si 35-50 wt% and Fe 12-30 wt%.
The addition amount of the rare earth modifier is 0.5-1.0 kg/t.
Example 1
When the steel for the cold roll is tapped from an electric furnace to a ladle refining furnace, adding 5kg/t refining slag and 2kg/t silicon-aluminum-barium along with the steel flow for pre-deoxidization and covering molten steel by rapid slag formation; after the ladle refining furnace seat is powered on, adding 3kg/t of calcareous alloy deoxidizer into molten steel for deoxidizing; adding three batches of calcium alloy deoxidizers for deoxidizing at intervals of 10 minutes after white slag is formed, and adding 0.5kg/t of calcium-silicon alloy for final deoxidizing after refining; then adding 0.5kg/t rare earth modifier which comprises Y30%, si 40% and Fe18%; the detection steel has no large eutectic carbide, and the carbide dispersion is fine.
Example 2
When the steel for the cold roll is tapped from an electric furnace to a ladle refining furnace, adding 4kg/t refining slag and 1.8kg/t silicon-aluminum-barium along with the steel flow for pre-deoxidizing and covering molten steel by rapid slag formation; after the ladle refining furnace seat is powered on, adding 5kg/t of calcareous alloy deoxidizer into molten steel for deoxidizing; adding three batches of calcium alloy deoxidizers for deoxidizing at intervals of 10 minutes after white slag is formed, and adding 1kg/t of calcium-silicon alloy for final deoxidizing after refining; then adding 0.8kg/t rare earth modifier which comprises Y35%, si 45% and Fe20%; the detection steel has no large eutectic carbide, and the carbide dispersion is fine.
The differences between this embodiment and embodiment 1 are: wherein the addition amount of refining slag, silicon aluminum barium, calcium alloy deoxidizer and silicon calcium alloy is respectively 4kg/t, 1.8kg/t, 5kg/t and 1kg/t, the addition amount of rare earth modifier is 0.8kg/t, and the modifier comprises Y35%, si 45% and Fe20%.
Example 3
When the steel for the cold roll is tapped from an electric furnace to a ladle refining furnace, adding 4.5kg/t refining slag and 2.2kg/t silicon-aluminum-barium along with the steel flow for pre-deoxidization and covering molten steel rapidly; after the ladle refining furnace seat is charged with electricity, adding 4.5kg/t of calcareous alloy deoxidizer into molten steel for deoxidization; adding three batches of calcium alloy deoxidizers for deoxidizing at intervals of 10 minutes after white slag is formed, and adding 0.8kg/t of calcium-silicon alloy for final deoxidizing after refining; then adding 1kg/t rare earth modifier which comprises Y25%, si 42% and Fe25%; the detection steel has no large eutectic carbide, and the carbide dispersion is fine.
The differences between this embodiment and embodiment 1 are: wherein the addition amount of refining slag, silicon aluminum barium, calcium alloy deoxidizer and silicon calcium alloy is respectively 4.5kg/t, 2.2kg/t, 4.5kg/t and 0.8kg/t, the addition amount of rare earth modifier is 1kg/t, and the modifier comprises Y25%, si 42% and Fe25%.
Example 4
When the steel for the cold roll is tapped from an electric furnace to a ladle refining furnace, adding 6kg/t refining slag and 1.8kg/t silicon-aluminum-barium along with the steel flow for pre-deoxidizing and covering molten steel by rapid slag formation; after the ladle refining furnace seat is powered on, adding 4kg/t of calcareous alloy deoxidizer into molten steel for deoxidizing; adding three batches of calcium alloy deoxidizers for deoxidizing at intervals of 10 minutes after white slag is formed, and adding 1kg/t of calcium-silicon alloy for final deoxidizing after refining; then adding 0.8kg/t rare earth modifier which comprises Y40%, si 35% and Fe12%; the detection steel has no large eutectic carbide, and the carbide dispersion is fine.
The differences between this embodiment and embodiment 1 are: wherein the addition amount of refining slag, silicon aluminum barium, calcium alloy deoxidizer and silicon calcium alloy is respectively 6kg/t, 1.8kg/t, 4kg/t and 1kg/t, the addition amount of rare earth modifier is 0.8kg/t, and the modifier comprises Y40%, si 35% and Fe12%.
Example 5
When the steel for the cold roll is tapped from an electric furnace to a ladle refining furnace, adding 3kg/t refining slag and 1.8kg/t silicon-aluminum-barium along with the steel flow for pre-deoxidizing and covering molten steel by rapid slag formation; after the ladle refining furnace seat is powered on, adding 3kg/t of calcareous alloy deoxidizer into molten steel for deoxidizing; adding three batches of calcium alloy deoxidizers for deoxidizing at 15 minutes intervals after white slag is formed, and adding 0.8kg/t of calcium-silicon alloy for final deoxidizing after refining; then adding 0.8kg/t rare earth modifier which comprises Y30%, si 50% and Fe12%; the detection steel has no large eutectic carbide, and the carbide dispersion is fine.
The differences between this embodiment and embodiment 1 are: wherein the addition amount of refining slag, silicon aluminum barium, calcium alloy deoxidizer and silicon calcium alloy is respectively 3kg/t, 1.8kg/t, 3kg/t and 0.8kg/t, the addition amount of rare earth modifier is 0.8kg/t, and the modifier comprises Y30%, si 50% and Fe12%.
Example 6
When the steel for the cold roll is tapped from an electric furnace to a ladle refining furnace, adding 3kg/t refining slag and 1.8kg/t silicon-aluminum-barium along with the steel flow for pre-deoxidizing and covering molten steel by rapid slag formation; after the ladle refining furnace seat is powered on, adding 3kg/t of calcareous alloy deoxidizer into molten steel for deoxidizing; adding three batches of calcium alloy deoxidizers for deoxidizing at 15 minutes intervals after white slag is formed, and adding 0.8kg/t of calcium-silicon alloy for final deoxidizing after refining; then adding 0.8kg/t rare earth modifier which comprises Y30%, si 35% and Fe30%; the detection steel has no large eutectic carbide, and the carbide dispersion is fine.
The differences between this embodiment and embodiment 1 are: wherein the addition amount of refining slag, silicon aluminum barium, calcium alloy deoxidizer and silicon calcium alloy is respectively 3kg/t, 1.8kg/t, 3kg/t and 0.8kg/t, the addition amount of rare earth modifier is 0.8kg/t, and the modifier comprises Y30%, si 35% and Fe30%.
The invention can be realized by upper and lower limit values and interval values of the technological parameters (such as material component proportion, feeding mass ratio, time and the like), and examples are not listed here.
In conclusion, the method can improve the form of the steel carbide for the cold roll, the generated carbide is relatively dispersed and fine, the formation of massive eutectic carbide is prevented and reduced, grains are further refined, and the structure and performance of the roll are improved.
Claims (2)
1. A smelting method of steel for cold rolls is characterized in that: when the electric furnace is tapped to a ladle refining furnace, 3-6 kg/t of refining slag and 1.8-2.2 kg/t of silicon-aluminum-barium are added along with the flow for pre-deoxidization so as to cover molten steel by rapid slag formation; after ladle refining furnace seat package, power transmission and slag making, adding 3-5 kg/t of calcium alloy deoxidizer for deoxidization, consolidating white slag according to furnace atmosphere, adding calcium alloy deoxidizer or carburant for deoxidization in batches at intervals of 10-15 minutes, and adding 0.5-1 kg/t of silicon-calcium alloy for final deoxidization after refining; adding rare earth modifier under the condition of sufficient deoxidation;
the rare earth modifier comprises 25-40% of Y, 35-50% of Si and 12-30% of Fe; the addition amount of the rare earth modifier is 0.5-1.0 kg/t.
2. The method for smelting steel for cold rolls according to claim 1, wherein: the refining slag is CaO-Al 2 O 3 And (5) slag system.
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| CN202210606934.4A CN115216586B (en) | 2022-05-31 | 2022-05-31 | Smelting method of steel for cold roll |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109280743A (en) * | 2018-11-19 | 2019-01-29 | 湖北富烽新材料科技有限公司 | A kind of roll high-strength abrasion-proof steel and its production method |
| CN110157988A (en) * | 2019-06-27 | 2019-08-23 | 锦州金科高新技术发展有限责任公司 | High-purity, the homogeneous rare earth cold roll steel alloy material of one kind and preparation method |
| CN110205542A (en) * | 2019-05-22 | 2019-09-06 | 山东钢铁股份有限公司 | A kind of cold roll tool steel and preparation method thereof |
| WO2020078007A1 (en) * | 2018-10-17 | 2020-04-23 | 南京钢铁股份有限公司 | High-strength high-toughness non-quenched and tempered round steel and preparation method |
| CN111118276A (en) * | 2020-01-10 | 2020-05-08 | 太仓市五洲轧辊有限公司 | Heat treatment process for ultra-deep quench-hardened cold roll |
-
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- 2022-05-31 CN CN202210606934.4A patent/CN115216586B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020078007A1 (en) * | 2018-10-17 | 2020-04-23 | 南京钢铁股份有限公司 | High-strength high-toughness non-quenched and tempered round steel and preparation method |
| CN109280743A (en) * | 2018-11-19 | 2019-01-29 | 湖北富烽新材料科技有限公司 | A kind of roll high-strength abrasion-proof steel and its production method |
| CN110205542A (en) * | 2019-05-22 | 2019-09-06 | 山东钢铁股份有限公司 | A kind of cold roll tool steel and preparation method thereof |
| CN110157988A (en) * | 2019-06-27 | 2019-08-23 | 锦州金科高新技术发展有限责任公司 | High-purity, the homogeneous rare earth cold roll steel alloy material of one kind and preparation method |
| CN111118276A (en) * | 2020-01-10 | 2020-05-08 | 太仓市五洲轧辊有限公司 | Heat treatment process for ultra-deep quench-hardened cold roll |
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