CN101928839A - Slag system for electroslag remelting of manganese-based alloy steel and using method thereof - Google Patents
Slag system for electroslag remelting of manganese-based alloy steel and using method thereof Download PDFInfo
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- CN101928839A CN101928839A CN2009100538418A CN200910053841A CN101928839A CN 101928839 A CN101928839 A CN 101928839A CN 2009100538418 A CN2009100538418 A CN 2009100538418A CN 200910053841 A CN200910053841 A CN 200910053841A CN 101928839 A CN101928839 A CN 101928839A
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Abstract
The invention provides a slag system for electroslag remelting of manganese-based alloy steel and a using method thereof. The slag system consists of CaF2, and smoothly realizes the electroslag remelting process by matching the smelting of the slag material and smelting of the metal consumable electrode manganese-based alloy steel, and the electroslag remelting process comprises the following steps of: 1) weighing and roasting CaF2; 2) preparing an electrode plate, an ingot lead plate, a crystallizer and an arc striking agent CaF2+TiO2; 3) slagging; 4) remelting; and 5) demolding. By the electroslag remelting of the manganese-based alloy steel, pure and high-quality steel ingot which trends to axial crystallization can be obtained, and the system and the method have the advantages of greatly improving the metallurgical quality, the thermal machining performance and the yield and obviously improving the quality, along with small crystallization segregation, a few impurities, low shrinkage cavity and loosening degree, no cracks in forging, hot rolling and the like and substantially no peeling, so that the system and the method have great popularization and application prospect.
Description
Technical field
The invention belongs to metallurgy industry smelting iron and steel Technology field, relate in particular to a kind of slag system and using method thereof that is used for electroslag remelting of manganese-based alloy steel.
Background technology
So-called manganese-base alloy steel is meant the steel alloy of Mn content 〉=50%, Ni content≤30%, Cu content≤30%, as Mn75Ni15Cu10, Mn72Ni10Cu18 etc.Because manganese content height, use vacuum induction furnace smelting cost height, and vacuum system equipment and environment there is detrimentally affect, therefore, usually adopt electrosmelting or non-vacuum induction furnace to smelt, but the steel ingot that electrosmelting or non-vacuum induction furnace are smelted is easy to generate defectives such as cracking, crackle when forging, of poor quality, is difficult to satisfy service requirements.This mainly is that the manganese-base alloy steel ingot gas content of smelting because of electrosmelting or non-vacuum induction furnace is higher, inclusion is more, crystalline state is relatively poor, and promptly metallurgical quality is relatively poor.
Esr is to utilize electric current to pass through the heat melts metal electrode that slag produces, and forms molten drop, and molten drop passes slag blanket and drops to slowly crystallization in the water mold.Owing to just can keep the metal pool of a liquid state under the slag steel interface, metal all contacts slag liquid from the fusing beginning until solidify later whole process, by the series reaction between slag-steel, molten steel is purified, and because molten steel has superior crystallization condition in crystallizer, so, generally speaking, behind esr, can obtain pure and be tending towards axial crystalline high-quality steel ingot, thereby improve the metallurgical quality of steel, improve hot workability.
The effect of esr depends primarily on the selection of remelting slag slag system.The selection difficulty of the remelting slag slag system of manganese-base alloy steel is very big." steel alloy and alloy smelting technology " book that high temperature teaching and research room of Beijing College of Iron and Steel Technology write June nineteen eighty-two is thought: " usually the fusing point of slag system is selected and is advisable for 100～150 ℃ to be lower than the seasoning metal fusing point; but can select the slag system suitable with alloy melting point to the esr of low-melting alloy such as nickel-base alloy ", promptly the fusing point of slag system should not be higher than the fusing point of seasoning metal at least.But the manganese-base alloy steel, as Mn75Ni15Cu10, Mn72Ni10Cu18 etc., fusing point is lower, and about 1030 ℃, and normally used electroslag slag system is mixed by a certain percentage by several slag charges, its fusing point is far above 1030 ℃.Electroslag theory routinely, because of can not find the low melting point slag system that is complementary, electroslag remelting of manganese-based alloy steel can't carry out.Therefore, break through the constraint of theory, seek the key that the low and electroslag slag system suitable manganese-base alloy steel of fusing point becomes success.
The slag system of esr generally all is made up of binary or ternary even more polynary slag charge, because it is reported, generally, the slag system esr effect that binary or polynary slag charge are formed is good than the monobasic slag system, so, seldom select the monobasic slag system for use.Though, also selected for use multiple slag system to carry out the test that esr improves manganese-base alloy steel ingot metallurgical quality in the past, fail to achieve success because of not finding suitable slag system.
With manganese-base alloy steel, esr, slag system, be the theme, through international online retrieval, obtain following 3 relevant patent information, for retrieve patent and the present invention be analyzed as follows:
Patent 1: U.S. Patent number US4450007, name are called the patent of " Original Titles:Process for electroslag remelting of manganese-base alloys.Electroslag remelting of manganese alloys-using high melting slag contg.calcium oxide; alumina and calcium fluoride ", and promptly the slag system of the selected esr of manganese-base alloy steel is Al
2O
3-CaO-CaF
2
Patent 2: USSR (Union of Soviet Socialist Republics) application number SU488871, name are called the patent of " Flux for manganese based alloys-contg.clacium and sodium fluorides and silica ", and the slag system of the selected esr of manganese-base alloy steel is CaF
244-60%, NaF 26-36%, SiO2 14-20%.
Patent 3: Chinese patent publication number CN1042191, name are called " high manganese rare earth alloy steel and smelting process thereof ", promptly add rare earth and smelt in high manganese steel, and the slag system that does not relate to esr is selected.
Summary of the invention
The purpose of this invention is to provide a kind of slag system and using method thereof that is used for electroslag remelting of manganese-based alloy steel, thereby esr process and function are achieved, improve the metallurgical quality of steel ingot, its hot workability is improved greatly, improve the quality and lumber recovery.
Technical scheme of the present invention is as follows: the slag system of the esr of suitable manganese-base alloy of the present invention is: 100% CaF
2,, improved the metallurgical quality of manganese-base alloy steel ingot by reasonably selecting the electroslag process technology.
Esr is exactly that metal consumable electrode is embedded in the slag blanket, and slag produces the slag thermal resistance owing to switching on, thereby electrode is heated up so that fusing.The fusing of metal from the top layer of high-temperature zone, forms molten drop at electrode tip earlier gradually, and the superheated molten drop is located electrode tip and broken to fall and pass slag blanket and drop in the water mold under gravity, slag steel interfacial surface tension and electrodynamic comprehensive action.Along with the continuous fusing of electrode,
Seasoning metal fusing is very fast, uncontrollable molten steel solidify crystallization with steel ingot, make the crystalline quality of steel ingot poor.Monobasic CaF
2Make slag system, the slag charge fusing point is low, and slag resistivity is little, and slag viscosity and surface tension are little, and the metal electrode burn-off rate is moderate when making electroslag remelting of manganese-based alloy steel, and solidifying with the crystallization effect of steel ingot of molten steel is good.
The object of the present invention is achieved like this: a kind of slag system that is used for electroslag remelting of manganese-based alloy steel, its moiety are CaF
2, using method comprises following steps: 1) weighing CaF
2(CaF
2Consumption be steel ingot weight 5～8%), the baking; 2) prepare battery lead plate, Dummy plate, crystallizer and striking agent CaF
2+ TiO
23) change slag; 4) remelting: electric current: 1000～6000A, voltage: 25～60V; 5) demoulding.
Preferably, described step 1) baking is meant CaF
2Through baking more than 600 ℃ at least 4 hours, then in insulation more than 150 ℃; Slag charge after baking must ready access upon use, in the time of wouldn't using for some reason, should advance the stay-warm case insulation immediately, still can use in 2 hours, the heat-obtaining slag that surpasses 2 hours again.
Step 2) electrode should adopt electric furnace or non-vacuum induction furnace to smelt the casting metal electrode bar in, is of a size of 120 millimeters of Ф; Dummy plate adopts same steel grade, and 150 millimeters of the about Ф of heelpiece size are welded on the head of electrode bar, before the welding, proofread and correct, guarantee the level of putting with horizontal measuring instrument, then at the enterprising spot welding of whole circumference, because local pulling force makes electrode bar and supporting electrode non-vertical, during welding, scale on surface must be removed through grinding when preventing to weld, can weld after clearing up whole residues, residual steel, and reduce the corrosion of electrode bar as far as possible, and guaranteeing that firm welding is vertical, weld seam does not have crackle; 230 millimeters of crystallizer size: Ф guarantee to clear up that end water tank copper panel is seriously not uneven, residue and cold steel, have good electrical conductivity and speed of cooling, do not have percolating water phenomenon, and maintenance are insulated with the ingot dolly.Dummy ingot is put to end water tank copper panel central authorities, guaranteed between Dummy plate and the end water tank seamless.Shop fixtures slag around Dummy plate is with striking agent (CaF
2+ TiO
2) be placed in the middle of the Dummy plate.The steady center of crystallizer is placed on the end water tank copper panel, and crystallizer must not be collided with Dummy plate.After crystallizer is put, note water coolant leather hose position, avoid when starting the ingot dolly, rolling bad, the distortion cause the cutout or current not smooth.
Preferably, change slag in the described step 3) and be meant that the decline electrode bar makes it to contact with the striking agent, the energising of in crystallizer, closing a floodgate behind a little slag charge of adding earlier before the energising, energising back slag charge evenly adds around the crystallizer, and the slow back of elder generation is fast, prevents unexpected arc extinguishing.
Preferably, changing the time in slag stage in the described step 3) is 6～14 minutes, electric current: 1000～6000A, voltage: 25～60V.
Preferably, described step .4) after remelting begins, adopting little electric current earlier, range of current is 500～
Seriously, of poor quality, be difficult to the normal embarrassment of using.
Embodiment
Embodiment 1, uses CaF
2The test of slag system esr Mn75Ni15Cu10
Technical process is: CaF
2Preparation (weigh, toast) → esr before technological preparation (comprising the preparation of metal electrode, Dummy plate, striking agent etc.) → starting the arc slag making → electroslag furnace normally smelt.
1, starting material: electric furnace or non-vacuum induction furnace are smelted the metal electrode bar of cast.
1.1 electrode bar chemical ingredients (%)
| C | Si | S | P | Fe | Ni | Cu | Mn |
| 0.028 | 0.380 | 0.015 | 0.005 | 0.10 | 14.88 | 10.10 | Surplus |
120 millimeters of 1.2 electrode size: Φ, 330 kilograms of weight, 3.
1.3 Dummy plate: adopt same steel grade, 150 millimeters of the about Φ of heelpiece size.
1.4 striking agent: CaF
2+ TiO
2
2, electroslag remelting process
2.1 slag system: 100% CaF
2
The quantity of slag: 18 kilograms
Electric current: 1000～6000A voltage: 25～60V
2.2 230 millimeters of crystallizer size: Ф
3, electroslag ingot
3.1 electroslag ingot chemical ingredients (%)
| C | Si | S | P | Fe | Ni | Cu | Mn |
| 0.04 | 0.29 | 0.006 | 0.004 | 0.10 | 15.05 | 10.12 | Surplus |
3.2 230 millimeters * 1.0m of steel ingot size: Φ; Weight: 350 kilograms
4, effect: without the Mn75Ni15Cu10 of esr, forging crack is serious, and limit portion breach length reaches 40mm sometimes, and the width of breach is the thickness of entire plate, and the degree of depth reaches 25mm; Adopt CaF2 slag system esr Mn75Ni15Cu10, esr process is realized smoothly, shrinkage cavity and porousness are little, forge and do not have cracking, whole the forged slab of steel ingot finds no breach and exists, the ESR ingot metallurgical quality improves, and the S constituent content descends, and makes that hot workabilitys such as forging, hot rolling are improved greatly, lumber recovery also greatly improves more than 10%.
Embodiment 2 uses CaF
2The test of slag system esr Mn72Ni10Cu18
Technical process is: CaF
2Preparation (weigh, toast) → esr before technological preparation (comprising the preparation of metal electrode, Dummy plate, striking agent etc.) → starting the arc slag making → electroslag furnace normally smelt.
1, starting material: electric furnace or non-vacuum induction furnace are smelted the metal electrode bar of cast.
1.1 electrode bar chemical ingredients (%)
| C | Si | S | P | Fe | Ni | Cu | Mn |
| 0.025 | 0.270 | 0.010 | 0.006 | 0.11 | 10.12 | 18.02 | Surplus |
120 millimeters of 1.2 electrode size: Ф, 330 kilograms of weight, 3.
1.3 Dummy plate: adopt same steel grade, 150 millimeters of the about Ф of heelpiece size.
1.4 striking agent: CaF
2+ TiO
2
2, electroslag remelting process
2.1 slag system: 100% CaF
2
The quantity of slag: 18 kilograms
Electric current: 1000～6000A voltage: 25～60V
2.2 230 millimeters of crystallizer size: Ф
3, electroslag ingot
3.1 electroslag ingot chemical ingredients (%)
| C | Si | S | P | Fe | Ni | Cu | Mn |
| 0.032 | 0.20 | 0.005 | 0.004 | 0.10 | 10.15 | 17.98 | Surplus |
3.2 230 millimeters * 1.0m of steel ingot size: Ф; Weight: 350 kilograms
4, effect: use CaF
2Slag system esr Mn72Ni10Cu18 can make esr process realize smoothly, and shrinkage cavity and porousness are little, and the ESR ingot metallurgical quality improves, and the S constituent content descends, and makes that hot workabilitys such as forging, hot rolling are improved greatly, lumber recovery greatly improves more than 10%.
In sum, select monobasic CaF for use
2Making slag system esr manganese-base alloy steel can obtain pure and be tending towards axial crystalline high-quality steel ingot, coring is less, be mingled with less, shrinkage cavity and porousness are little, metallurgical quality improves greatly, peeling is not ftractureed, does not have substantially in forging, hot rolling etc., hot workability is improved greatly, quality obviously improves, and lumber recovery improves greatly, thereby possesses good prospect for promotion and application.
Be noted that above enumerate only for two specific embodiments of the present invention, obviously the invention is not restricted to above embodiment, many similar variations are arranged thereupon.If those skilled in the art all should belong to protection scope of the present invention from all distortion that content disclosed by the invention directly derives or associates.
Claims (7)
1. slag system that is used for electroslag remelting of manganese-based alloy steel, it is characterized in that: moiety is CaF
2
2. using method that is used for the slag system of electroslag remelting of manganese-based alloy steel is characterized in that comprising following steps:
1) weighing CaF
2, CaF
2Consumption be 5～8% of steel ingot weight, the baking;
2) prepare battery lead plate, Dummy plate, crystallizer and striking agent CaF
2+ TiO
2
3) change slag;
4) remelting: electric current: 1000～6000A, voltage: 25～60V;
5) demoulding.
3. the using method that is used for the slag system of electroslag remelting of manganese-based alloy steel as claimed in claim 2 is characterized in that: described step 1) baking is meant CaF
2Through baking more than 600 ℃ at least 4 hours, then in insulation more than 150 ℃.
4. the using method that is used for the slag system of electroslag remelting of manganese-based alloy steel as claimed in claim 2, it is characterized in that: change slag in the described step 3) and be meant that the decline electrode bar makes it to contact with the striking agent, combined floodgate energising behind a little slag charge of adding in crystallizer earlier before the energising, energising back slag charge evenly adds around the crystallizer, slow earlier back is fast, prevents unexpected arc extinguishing.
5. the using method that is used for the slag system of electroslag remelting of manganese-based alloy steel as claimed in claim 2 is characterized in that: changing the time in slag stage in the described step 3) is 6～14 minutes, electric current: 1000～6000A, voltage: 25～60V.
6. the using method that is used for the slag system of electroslag remelting of manganese-based alloy steel as claimed in claim 2 is characterized in that: after described step 4) remelting begins, adopt little electric current earlier, range of current is 500～2000A, carry out the secondary slag, treat that scorification is saturating, change remelting over to after the slag temperature is normal.
7. the using method that is used for the slag system of electroslag remelting of manganese-based alloy steel as claimed in claim 2 is characterized in that: not mobile ingot dolly in back 10 minutes of the cold beginning of described step 5) mould, mould cool time 〉=30 minute, the demoulding behind the mould cold junction bundle.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100538418A CN101928839A (en) | 2009-06-25 | 2009-06-25 | Slag system for electroslag remelting of manganese-based alloy steel and using method thereof |
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|---|---|---|---|
| CN2009100538418A CN101928839A (en) | 2009-06-25 | 2009-06-25 | Slag system for electroslag remelting of manganese-based alloy steel and using method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104152710A (en) * | 2014-08-28 | 2014-11-19 | 攀钢集团成都钢钒有限公司 | Refining slag for electroslag remelting, and smelting method and application of refining slag |
| CN105463200A (en) * | 2016-01-13 | 2016-04-06 | 内蒙古北方重工业集团有限公司 | Arc striking agent for electroslag remelting and arc striking method |
| CN108425063A (en) * | 2018-03-20 | 2018-08-21 | 湖州久立永兴特种合金材料有限公司 | A kind of preparation method of the high manganese intermediate alloy of high cleanliness |
-
2009
- 2009-06-25 CN CN2009100538418A patent/CN101928839A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104152710A (en) * | 2014-08-28 | 2014-11-19 | 攀钢集团成都钢钒有限公司 | Refining slag for electroslag remelting, and smelting method and application of refining slag |
| CN104152710B (en) * | 2014-08-28 | 2016-04-13 | 攀钢集团成都钢钒有限公司 | The smelting process of esr refining slag and application thereof |
| CN105463200A (en) * | 2016-01-13 | 2016-04-06 | 内蒙古北方重工业集团有限公司 | Arc striking agent for electroslag remelting and arc striking method |
| CN108425063A (en) * | 2018-03-20 | 2018-08-21 | 湖州久立永兴特种合金材料有限公司 | A kind of preparation method of the high manganese intermediate alloy of high cleanliness |
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Application publication date: 20101229 |