CN115287464B - Electroslag remelting method for preventing abnormal precipitation of carbide on surface layer of cold roll - Google Patents
Electroslag remelting method for preventing abnormal precipitation of carbide on surface layer of cold roll Download PDFInfo
- Publication number
- CN115287464B CN115287464B CN202210912560.9A CN202210912560A CN115287464B CN 115287464 B CN115287464 B CN 115287464B CN 202210912560 A CN202210912560 A CN 202210912560A CN 115287464 B CN115287464 B CN 115287464B
- Authority
- CN
- China
- Prior art keywords
- current
- melting speed
- electroslag remelting
- knot
- slag
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses an electroslag remelting method for preventing abnormal precipitation of carbide on the surface layer of a cold roll, wherein slag system adopted in the electroslag remelting comprises 15-25 wt% of LF refining slag, 5-10 wt% of dolomite, 5-10 wt% of bauxite, 15-25 wt% of fluorite and 40-50 wt% of electroslag remelting return slag. In the electroslag remelting process, a control method of current increment and melting speed increment is adopted in a roll neck forming stage, a control method of current stabilization and melting speed stabilization is adopted in a roll body forming stage, a control method of current decrement and melting speed decrement is adopted in a roll neck reentry stage, and a control method of current decrement and melting speed decrement is adopted in a feeding stage. According to the electroslag remelting method disclosed by the invention, on one hand, a specific remelting slag system is selected, and on the other hand, the problem of abnormal precipitation of carbide on the surface layer of the cold roll can be effectively solved by controlling remelting process parameters of each stage, so that the influence on the quality of the subsequent cold-rolled sheet is avoided.
Description
Technical Field
The invention belongs to the technical field of electroslag remelting, and particularly relates to an electroslag remelting method for preventing abnormal precipitation of carbide on the surface layer of a cold roll.
Background
With the rapid development of the steel industry, the quality requirements on the steel plate are more and more strict, and the quality requirements on the cold roll are also more and more strict, so that at present, all steel factories at home and abroad generally adopt an electroslag remelting method for smelting the cold roll, and the electroslag remelting process is a main refining means of the current high-quality steel, because the electroslag remelting has excellent solidification and crystallization conditions and good slag washing effect.
However, the cold roll remelted and refined by electroslag remelting easily causes abnormal changes in a metal molten pool due to fluctuation of a remelting process, so that carbide on the surface layer of the cold roll is unevenly precipitated (i.e., abnormal precipitation). Since the cold roll is always in contact with the steel plate in the cold rolling process, large particles and high-hardness carbide which are abnormally precipitated on the surface of the cold roll can directly influence the surface quality of the steel plate.
Therefore, how to control the stability of the process in the electroslag remelting process and ensure the consistency of the depth of a metal molten pool, so that the uniform precipitation of carbide on the surface layer of the cold roll is an urgent problem in the field.
Disclosure of Invention
The invention aims to solve the problems and provide an electroslag remelting method for preventing abnormal precipitation of carbide on the surface layer of a cold roll, which is low in production cost.
The technical scheme for realizing the aim of the invention is as follows: an electroslag remelting method for preventing abnormal precipitation of carbide on the surface layer of a cold roller, wherein the electroslag remelting adopts slag system composed of 15-25wt% of LF refining slag, 5-10wt% of dolomite, 5-10wt% of bauxite, 15-25wt% of fluorite and 40-50wt% of electroslag remelting return slag.
The LF refining slag comprises 40-50wt% of CaO and 30-40wt% of Al 2 O 3 5 to 10 weight percent of MgO and 8 to 15 weight percent of SiO 2 。
The composition of the electroslag remelting return slag is 60-70wt% of CaF 2 20 to 30 weight percent of Al 2 O 3 And 5 to 15wt% of CaO.
In the roll neck forming stage (namely, remelting starting stage), a control method of current increment and melting speed increment is adopted.
In the roll body forming stage (namely, the roll body remelting is started), a control method of current stabilization and melt speed stabilization is adopted.
And in the stage of re-entering the roll neck (namely remelting the roll neck at the other end), adopting a control method of current decrement and melt rate decrement.
In the feeding stage, a control method of current decrease and melting speed decrease is adopted.
The control method of the current increment and the melting speed increment adopted in the roll neck forming stage is to gradually increment the current from the first current to the second current and gradually increment the melting speed to the first melting speed.
The first current is 4500-6000A.
The second current is related to the crystallizer diameter; the following formula is specifically satisfied: second current=18 to 22D Knot(s) The unit is A.
Wherein: d (D) Knot(s) The number of the diameter unit of the mold is mm (the same applies hereinafter).
The first melt rate is related to the crystallizer diameter; the following formula is specifically satisfied: first melting rate=0.80 to 0.90D Knot(s) The unit is kg/h.
The control method of the current stabilization and the melting speed stabilization adopted in the roll body forming stage is to stabilize the current at a second current and the melting speed at a second melting speed.
The second melt rate is related to the crystallizer diameter; the following formula is specifically satisfied: second melting rate=0.75 to 0.85D Knot(s) The unit is kg/h.
The control method of current decrease+melting speed decrease adopted in the reentry roll neck stage is to gradually decrease the current from the second current to the third current and gradually decrease the melting speed from the second melting speed to the third melting speed.
The third current is related to the crystallizer diameter; the following formula is specifically satisfied: third current=9 to 12D Knot(s) The unit is A.
The third melt rate is related to the crystallizer diameter; the following formula is specifically satisfied: third melting rate=0.40 to 0.50D Knot(s) The unit is kg/h.
The control method of current decrease and melting speed decrease adopted in the feeding stage is to gradually decrease the current from the third current to the fourth current and gradually decrease the melting speed from the third melting speed to the fourth melting speed.
The fourth current is related to the crystallizer diameter; the following formula is specifically satisfied: fourth current=4 to 5D Knot(s) The unit is A.
The fourth melt rate is related to the crystallizer diameter; the following formula is specifically satisfied: fourth melting speed=0.10 to 0.20D Knot(s) The unit is kg/h.
The invention has the positive effects that:
(1) According to the electroslag remelting method disclosed by the invention, on one hand, a specific remelting slag system is selected, and on the other hand, the problem of abnormal precipitation of carbide on the surface layer of the cold roll can be effectively solved by controlling remelting process parameters of each stage, so that the influence on the quality of the subsequent cold-rolled sheet is avoided.
(2) The remelting slag system disclosed by the invention takes LF refining slag, dolomite, bauxite, fluorite and electroslag remelting return slag as main raw materials, so that not only is the physical and chemical properties of the slag system reasonable, but also the slag system cost is reduced by more than 40% compared with the traditional slag system cost due to the adoption of the electroslag remelting return slag, and the production cost is greatly reduced.
Detailed Description
Example 1
The electroslag remelting method for preventing abnormal precipitation of carbide on the surface layer of the cold roll in the embodiment specifically comprises the following steps:
s1: before electroslag remelting, the surface of the consumable electrode is polished by a shot blasting machine to remove impurities such as flying spurs, slag inclusion, iron scales and the like, and then the consumable electrode is preheated to 90+/-5 ℃, so that the temperature difference between the consumable electrode and slag liquid can be reduced, and the heat loss in the early remelting stage is reduced.
The crystallizer of this example had a diameter of 680mm.
The slag system used in this example was composed as follows: 20wt% LF refining slag, 5wt% dolomite, 8wt% bauxite, 20wt% fluorite and 47wt% electroslag remelting return slag.
The LF refining slag comprises the following components: 45wt% CaO, 35wt% Al 2 O 3 8wt% MgO and 12wt% SiO 2 。
The composition of the electroslag remelting return slag is as follows: 65wt% CaF 2 25wt% of Al 2 O 3 And 10wt% CaO.
S2: electroslag remelting.
S21: in the roll neck forming stage, the current is gradually increased from 5000A to 13000-13500A, and the melting speed is gradually increased to not more than 600kg/h.
S22: in the roll body forming stage, the current is stabilized at 13000-13500A, and the melting speed is stabilized at not more than 570kg/h.
S23: the roll neck stage was again entered, the current was gradually decreased from 13500A to 8000A, and the melting rate was gradually decreased from 570kg/h to 280kg/h.
S24: and in the feeding stage, the current is gradually decreased from 8000A to 3000A, the melting speed is gradually decreased from 280kg/h to 100kg/h, and the power failure is finished.
S3: after electroslag remelting, forging the electroslag ingot into a roller blank according to a conventional process, and detecting the surface layer of the roller blank, wherein abnormal precipitation of large-particle carbide is not found.
Example 2 to example 4
The electroslag remelting method for preventing abnormal precipitation of carbide on the surface layer of the cold roll in each example was substantially the same as that in example 1, except that table 1 was shown.
TABLE 1
| Example 1 | Example 2 | Example 3 | Example 4 | |
| LF refining slag | 20wt% | 18wt% | 20wt% | 20wt% |
| Dolomite (Dolomite) | 5wt% | 8wt% | 9wt% | 10wt% |
| Bauxite | 8wt% | 5wt% | 10wt% | 10wt% |
| Fluorite | 20wt% | 19wt% | 18wt% | 20wt% |
| Electroslag remelting return slag | 47wt% | 50wt% | 43wt% | 40wt% |
| Crystallizer diameter | 680mm | 800mm | 900mm | 1000mm |
| First current | 5000A | 5000A | 5500A | 5500A |
| Second current | 13000～13500A | 16500～17000A | 18500～19000A | 20000～21000A |
| First melting speed | ≤600kg/h | ≤680kg/h | ≤770kg/h | ≤830kg/h |
| Second melting speed | ≤570kg/h | ≤650kg/h | ≤720kg/h | ≤800kg/h |
| Third current | 8000A | 9000A | 10000A | 9000A |
| Third melting speed | 280kg/h | 350kg/h | 400kg/h | 500kg/h |
| Fourth current | 3000A | 3500A | 4000A | 4000A |
| Fourth melting speed | 100kg/h | 150kg/h | 180kg/h | 200kg/h |
| Cold roll surface layer detection | No abnormal precipitation of large-particle carbide was found | No abnormal precipitation of large-particle carbide was found | No abnormal precipitation of large-particle carbide was found | No large-particle carbide abnormality was foundPrecipitation of |
Claims (1)
1. An electroslag remelting method for preventing abnormal precipitation of carbide on the surface layer of a cold roller is characterized by comprising the following steps of:
the slag system used for electroslag remelting comprises 15-25 wt% of LF refining slag, 5-10 wt% of dolomite, 5-10 wt% of bauxite, 15-25 wt% of fluorite and 40-50 wt% of electroslag remelting return slag; the LF refining slag comprises 40-50wt% of CaO and 30-40wt% of Al 2 O 3 5 to 10 weight percent of MgO and 8 to 15 weight percent of SiO 2 The method comprises the steps of carrying out a first treatment on the surface of the The composition of the electroslag remelting return slag is 60-70wt% of CaF 2 20 to 30 weight percent of Al 2 O 3 5-15 wt% of CaO;
the electroslag remelting process parameters are as follows:
gradually increasing the current from the first current to the second current and gradually increasing the melting speed to the first melting speed; the first current is 4500-6000A; the second current=18 to 22D Knot(s) The unit is A; the D is Knot(s) The diameter unit of the crystallizer is a numerical value of mm; the first melting speed=0.80-0.90D Knot(s) The unit is kg/h;
the roller body forming stage is used for stabilizing the current at a second current and stabilizing the melting speed at a second melting speed; the second melting speed=0.75 to 0.85D Knot(s) The unit is kg/h;
the roll neck stage is entered again, the current is gradually decreased from the second current to the third current, and the melting speed is gradually decreased from the second melting speed to the third melting speed; the third current=9 to 12D Knot(s) The unit is A; the third melting speed=0.40 to 0.50D Knot(s) The unit is kg/h;
gradually decreasing the current from the third current to the fourth current and gradually decreasing the melting speed from the third melting speed to the fourth melting speed; the fourth current=4 to 5D Knot(s) The unit is A; the fourth melting speed=0.10 to 0.20D Knot(s) The unit is kg/h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210912560.9A CN115287464B (en) | 2022-07-30 | 2022-07-30 | Electroslag remelting method for preventing abnormal precipitation of carbide on surface layer of cold roll |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210912560.9A CN115287464B (en) | 2022-07-30 | 2022-07-30 | Electroslag remelting method for preventing abnormal precipitation of carbide on surface layer of cold roll |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115287464A CN115287464A (en) | 2022-11-04 |
| CN115287464B true CN115287464B (en) | 2023-04-28 |
Family
ID=83825964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210912560.9A Active CN115287464B (en) | 2022-07-30 | 2022-07-30 | Electroslag remelting method for preventing abnormal precipitation of carbide on surface layer of cold roll |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115287464B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100352955C (en) * | 2005-12-26 | 2007-12-05 | 内蒙古科技大学 | Preparation method of pre-melting electroslag |
| CN100494411C (en) * | 2006-01-16 | 2009-06-03 | 重庆大学 | Refining slag agent for aluminum-calcium-strontium composite premelted molten steel refining outside the furnace |
| PL213251B1 (en) * | 2009-02-02 | 2013-02-28 | Akad Gorniczo Hutnicza | Method of manufacturing slag-forming mixture for the secondary steel refining in a ladle or in a ladle furnace |
| CN101935740B (en) * | 2010-09-21 | 2012-09-05 | 攀枝花钢城集团有限公司 | White slag refining agent for LF (Ladle Furnace) refining furnace and preparation method thereof |
| JP2013049908A (en) * | 2011-08-31 | 2013-03-14 | Jfe Steel Corp | Method for producing high-purity steel by electroslag remelting method |
-
2022
- 2022-07-30 CN CN202210912560.9A patent/CN115287464B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN115287464A (en) | 2022-11-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107686871B (en) | Production method of non-quenched and tempered steel | |
| CN102220544A (en) | Steel material of hot-working die and its production process | |
| KR20220146517A (en) | Recovery method of ultra-high purity copper-manganese target material | |
| CN114015936A (en) | High-nitrogen gear steel and preparation method thereof | |
| CN110923399A (en) | A two-step composite microalloying method for 400MPa grade rebar | |
| CN101220414B (en) | Technique for casting and rolling to produce 5052 alloy with electrolytic aluminium liquid short process flow | |
| CN101519743B (en) | Vanadium chromium aluminum alloy and method for producing the same | |
| CN115287464B (en) | Electroslag remelting method for preventing abnormal precipitation of carbide on surface layer of cold roll | |
| CN112359275B (en) | Non-quenched and tempered cold-heading steel wire rod for high-strength fastener and preparation method thereof | |
| CN110438389B (en) | Production method of high-purity rare earth steel | |
| CN108975717A (en) | Nickel fibers clinker reuse method | |
| CN106567048A (en) | Manufacturing method of large-scale high-purity molybdenum alloy rotating target material | |
| CN114535555B (en) | Method for reducing erosion rate of ladle slag line in production of deformed steel bar | |
| CN111945079A (en) | Ultra-high pulling speed niobium-containing HRB500E deformed steel bar and production process thereof | |
| CN110722330A (en) | Production method of ultra-low carbon steel wire rod for electric conduction | |
| CN116695014A (en) | High-carbon steel wire rod with uniform deformation performance and manufacturing process | |
| CN113564384B (en) | Production method of refined antimony with ultralow arsenic content | |
| CN109371322A (en) | Meet half axle-steel and its manufacturing method of immediate quenching technique | |
| CN114561592A (en) | Method for preparing special-shaped channel steel | |
| CN103088255B (en) | Manufacturing process of automobile low-alloy high-strength steel cold-rolled sheet with high product of strength and elongation | |
| CN105177426A (en) | Normalizing rolling high-temperature-resistant capacitor plate and production method thereof | |
| CN104878273A (en) | Method for smelting ferrovanadium through iron particles and steel scraps | |
| CN103469107A (en) | A517Gr.B large pressure steel plate with low cost and high toughness and production method thereof | |
| CN116411216B (en) | Method for removing residual element antimony in medium-low carbon molten steel | |
| CN110616340A (en) | Method for preparing titanium ingots by hydrogenation dehydrogenation of recycled high-oxygen titanium materials |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |