CN102477476A - Method for feeding refractory alloy to vacuum induction furnace - Google Patents
Method for feeding refractory alloy to vacuum induction furnace Download PDFInfo
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- CN102477476A CN102477476A CN2010105578166A CN201010557816A CN102477476A CN 102477476 A CN102477476 A CN 102477476A CN 2010105578166 A CN2010105578166 A CN 2010105578166A CN 201010557816 A CN201010557816 A CN 201010557816A CN 102477476 A CN102477476 A CN 102477476A
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- pure iron
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- vacuum induction
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Abstract
The invention relates to a method for feeding refractory alloy to a vacuum induction furnace. According to the invention, in the last stage of high-vacuum refining process, when highly-volatile alloy elements with high melting point and small density are needed, a pure iron container holding the highly-volatile alloy elements with high melting point and small density is fed into the vacuum induction furnace by being suspended over a ramming rod or a vacuum low alloy hopper; and when the pure iron container is melted, the alloy particles in the inner cavity of the pure iron container are heated to be melted. The pure iron container is made of pure iron YTO1, the transverse dimension of the pure iron container is 60 mm to 80 mm, the longitudinal dimension of the pure iron container is 100 mm to 120 mm, and the inner cavity has a diameter (Phi) of 20 mm to 28 mm and extends in the longitudinal direction. After the alloy elements are loaded to the inner cavity, the container is sealed with a tapered plug made of pure iron YTO1 or sealed by welding an iron cover made of the same material as the container. The method is simple and increases the recovery rate of elements.
Description
Technical field
The present invention relates to a kind of charging process of vacuum induction furnace high melting point alloy.
Background technology
The vacuum induction furnace smelting molten steel need add sometimes that some density are little, fusing point is high, be not easy to get into the high melting point alloy of molten steel, as increases sulphur agent, nitrogen promoter, metal Sn etc., for this type alloy; Existing charging process is directly to add in the stove latter stage in the vacuum induction furnace refining; Because density is little, float on the molten bath, be difficult to get in the molten bath; The recovery is lower, general＜50%.For the narrower steel grade of Composition Control scope, be difficult to reach the composition requirement of regulation.
Summary of the invention
In order to overcome the above-mentioned deficiency of the charging process that has the vacuum induction furnace high melting point alloy now, the present invention provides the charging process of the higher vacuum induction furnace high melting point alloy of a kind of recovery of method simple elements.
Technical scheme of the present invention be need add at the vacuum induction furnace smelting molten steel that some density are little, when the high easy oxidation of fusing point, evaporable alloying element; In refining latter stage; The alloying pellet of the high easy oxidation of density is little, fusing point, the easy volatile element that need to add is packed in the cavity of pure iron container, with the pure iron container sealing.In high vacuum purified latter stage; Generally be preceding 5-10 minute of tapping; When need adding that fusing point is high, density is little, with adorning that these fusing points are high, density is little and the pure iron container of oxidized alloy element easily, smash through hanging on that alloy hopper feed way is added in the vacuum induction furnace under material bar or the vacuum with the alloying element of oxidation easily; In the process of pure iron container fusing; Alloying pellet in the cavity of pure iron container also is heated fusing, and also not floating just is melted to the molten steel surface, reaches the purpose of accurate interpolation alloying element.High melting point alloy of the present invention is meant three types of following alloys.
The alloy that fusing point is high is nitrided ferro-chromium, ferro-silicon nitride and ferro-niobium etc.
The alloy of oxidation is ferrotianium, silicocalcium etc. easily.
The alloy that density is little is Iron sulfuret, metal Sn, carburelant etc.
For fear of pure iron capsule contamination molten steel, select for use the lower pure iron YTO1 of C, Si, Mn, P and S content to process YTO1 pure iron container as the container manufacturing materials.Composition principal element Fe >=99.8% of pure iron YTO1.Use this sealed vessel to add alloy, neither increase impurity element,, the yield of alloy is reached more than 90% molten steel also not influence.
The YTO1 pure iron to the requirement of C, Si, Mn, P and S is:
C≤0.005％；Si≤0.03％；Mn≤0.12％；P≤0.009％；
S≤0.006%; All the other are Fe and unavoidable impurities.
The pure iron container must sink in the molten steel after adding molten steel, and the weight of pure iron container is greater than the buoyancy of smelting molten steel, and the element in the pure iron container all must be at the element of high vacuum refining adding in latter stage; The high vacuum refining time was generally 20 minutes; Require the fusing time of pure iron container to be not more than 10 minutes, so the pure iron container can not be too big, the lateral dimension of pure iron container is 60mm-80mm; Longitudinal size 100mm-120mm longitudinally has the cavity of diameter of phi 20mm-Φ 28mm.Pack alloying element behind the cavity into and to clog or to weld the iron covering sealing of same material with the tapered plug of same material.The addition of the easy evaporable alloying element of infusibility is not more than 100g.
General pure iron container is the cylindrical of length of side 60mm-80mm four prism type or diameter of phi 60-Φ 80mm.Pure iron container physical dimension is Φ 70 * 120mm
3Cylindrical better, cavity is axially.
The reinforced method of this vacuum induction furnace is applicable to that addition is not more than the situation of 100g.Be applicable to carbon, nitrogen, sulphur such as smelting oriented silicon steel, micronutrient levels is low and to the accurate steel grade of Composition Control.Charging process of the present invention is simple, can accurately control the content that steel grade adds element, and cost is low, and the recovery of element reaches 90%-98%.
Description of drawings
Fig. 1 is the longitudinal sectional view of pure iron container embodiments one.
Fig. 2 is the longitudinal sectional view of pure iron container embodiments two.
1-tapered plug 2-conical surface 3-axial cavity 4-pure iron shell 5-alloying pellet
6-iron covering 7-weld 8-axial cavity 9-pure iron shell 10-alloying pellet
Embodiment
Specify the embodiment that the reinforced method of this vacuum induction furnace reaches reinforced utensil below in conjunction with embodiment, but embodiment of the present invention is not limited to following embodiment.
Introduce two kinds of for reference pure iron containers earlier.
Pure iron container embodiments one
The structure of present embodiment is seen Fig. 1, and it is cylindrical pure iron container, and it has xsect is circular pure iron shell 4 and tapered plug 1; Pure iron shell 4 all is pure iron YTO1 with the material of tapered plug 1, an axial blind hole is arranged as axial cavity 3 at pure iron shell 4, and the diameter of pure iron shell 4 is Φ 70mm; High 120mm, the diameter of axial cavity 3 are Φ 25mm, dark 90mm; The diameter of tapered plug 1 one ends is Φ 24.5mm, and the diameter of the other end is Φ 25.5mm, and thickness is 18mm.During use, the alloying pellet 5 that need to add clogs sealing with tapered plug 1 for 3 mouthfuls with axial cavity after packing in the axial cavity 3 of pure iron container.
Pure iron container embodiments two
The structure of present embodiment is seen Fig. 2, and it is the pure iron container of four prism type, and it has xsect is foursquare pure iron shell 9 and pure iron covering 6; Pure iron shell 9 all is pure iron YTO1 with the material of iron covering 6, an axial blind hole is arranged as axial cavity 8 at pure iron shell 9, and the diameter of axial cavity 3 is Φ 25mm; Dark 90mm, the foursquare length of side of the xsect of pure iron shell 9 is 70mm, high 110mm; Iron covering 6 also is the square of length of side 70mm, and thickness is 10mm.During use, after the alloying pellet 10 that need to add was packed in the axial cavity 8 of pure iron container, iron covering 6 covered axial cavity 8 and welded seal.
Pure iron YTO1 among above-mentioned two embodiment to the requirement of C, Si, Mn, P and S is:
C?0.0015％；Si?0.011％；Mn?0.03％；P?0.009％；
S 0.005%; All the other are Fe and unavoidable impurities.
Charging process embodiment one
The equipment that present embodiment is smelted adopts the 200kg high vacuum induction furnace: final vacuum is 6.67 * 10
-2Pa, power are 250KW, and frequency is 2500HZ, batch 100kg.
Smelt steel grade: oriented silicon steel N2.
The present invention smelts 100kg oriented silicon steel N2 needs alloy species and consumption to see table 1, and the controlled target of oriented silicon steel N2 (weight percent) is seen table 2.
Table 1
| Raw material type | Pure iron | Electrolytic manganese | FeS | The nitrogenize silicomanganese | Special silicon | Sn | Graphite |
| Add-on (kg) | 95.5 | 0.075 | 0.006 | 0.015 | 4.17 | 0.05 | 0.058 |
Table 2
The present embodiment step is:
1 adds pure iron in the vacuum induction furnace, after energising is heated to 1600 ℃ of fusings, in vacuum induction furnace, charges into the nitrogen of 0.1bar, and in tapping preceding 8 minutes, 1 * 10
4Under the nitrogen protection of Pa, with the pure iron container of interior dress FeS, nitrogenize silicomanganese, Sn and graphite in hopper adding vacuum induction furnace.
What present embodiment adopted is pure iron container shown in Figure 1, is adorning 6.0gFeS, 15g nitrogenize silicomanganese, 50gq metal Sn and 58g graphite in the pure iron container.
After the fusing of 2 pure iron containers, add electrolytic manganese and special silicon, after the fusing, steel tapping casting, 1610 ℃ of tapping temperatures.
The weight percent proportioning and the recovery of the chemical ingredients of present embodiment oriented silicon steel N2 are seen table 3:
Table 3
| C％ | Si％ | Mn％ | N％ | S％ | Sn％ | |
| The finished product composition | 0.058 | 3.08 | 0.10 | 0.0073 | 0.007 | 0.005 |
| Recovery % | 96.67 | 96.25 | 90.9 | 97.33 | 93.33 | 100 |
Charging process embodiment two
The equipment that present embodiment is smelted adopts the 200kg high vacuum induction furnace: final vacuum is 6.67 * 10
-2Pa, power are 250KW, and frequency is 2500HZ, batch 100kg.
Smelt steel grade: oriented silicon steel AC2.
The present invention smelts 100kg oriented silicon steel AC2 needs alloy species and consumption to see table 4, and the controlled target of oriented silicon steel AC2 (weight percent) is seen table 5.
Table 4
| Raw material type | Pure iron | Electrolytic manganese | FeS | Ferro-silicon nitride | Special silicon | Graphite |
| Add-on (kg) | 95.0 | 0.110 | 0.020 | 0.017 | 4.33 | 0.034 |
Table 5
| C％ | Si％ | Mn％ | N％ | S％ | |
| Span of control | 0.025/0.035 | 3.0/3.2 | 0.15/0.25 | 0.005/0.008 | 0.007/0.008 |
| Controlled target | 0.030 | 3.1 | 0.20 | 0.007 | 0.007 |
The present embodiment step is:
1 adds pure iron in the vacuum induction furnace, after energising is heated to 1580 ℃ of fusings, in vacuum induction furnace, charges into the nitrogen of 0.1bar, and in tapping preceding 6 minutes, 1 * 10
4Under the nitrogen protection of Pa, the interior pure iron container of adorning FeS, ferro-silicon nitride and graphite is added in the vacuum induction furnace from hopper.
What present embodiment adopted is pure iron container shown in Figure 2, is adorning 20gFeS, 17g nitrogenize silicomanganese and 34g graphite in the pure iron container.
After the fusing of 2 line iron containers, add electrolytic manganese and special silicon, steel tapping casting, 1590 ℃ of tapping temperatures.
The weight percent proportioning and the recovery of the chemical ingredients of the oriented silicon steel AC2 of present embodiment are seen table 6:
Table 6
| C％ | Si％ | Mn％ | N％ | S％ | |
| The finished product composition | 0.030 | 3.06 | 0.19 | 0.0065 | 0.0082 |
| Recovery % | 100 | 96.25 | 95.0 | 92.86 | 91.11 |
Above-mentioned two charging process embodiment also can expect that bar is added in the vacuum induction furnace through hanging on to smash.The high melting point alloy that the present invention adds is not limited to the added refractory material of aforesaid method embodiment.
Claims (3)
1. the charging process of a vacuum induction furnace high melting point alloy; It is in high vacuum purified latter stage; When need adding that fusing point is high, density is little, with adorning that these fusing points are high, density is little and the pure iron container of oxidized alloy element easily, smash through hanging on that alloy hopper feed way is added in the vacuum induction furnace under material bar or the vacuum with the alloying element of oxidation easily; In the process of pure iron container fusing, the alloying pellet in the cavity of pure iron container also is heated fusing.
2. the charging process of vacuum induction furnace high melting point alloy according to claim 1; It is characterized in that: described pure iron container is that material is the pure iron container of pure iron YTO1; The lateral dimension of pure iron container is 60mm-80mm; Longitudinal size 100mm-120mm longitudinally has the cavity of diameter of phi 20mm-Φ 28mm, the iron covering sealing of packing alloying element to clog or weld pure iron YTO1 material with the tapered plug of pure iron YTO1 material behind the cavity into.
3. the charging process of vacuum induction furnace high melting point alloy according to claim 1 and 2 is characterized in that:
The alloy that fusing point is high is nitrided ferro-chromium, ferro-silicon nitride and ferro-niobium;
The alloy of oxidation is ferrotianium, silicocalcium easily;
The alloy that density is little is Iron sulfuret, metal Sn, carburelant.
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| CN2010105578166A CN102477476A (en) | 2010-11-20 | 2010-11-20 | Method for feeding refractory alloy to vacuum induction furnace |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102899453A (en) * | 2012-10-23 | 2013-01-30 | 鞍钢股份有限公司 | Deoxidization and desulfuration integrated block |
| CN103014233A (en) * | 2013-01-16 | 2013-04-03 | 裴忠飞 | Sealing method of metallurgy material |
| CN103114172A (en) * | 2013-03-04 | 2013-05-22 | 内蒙古包钢钢联股份有限公司 | Calcium treatment method of vacuum induction furnace in smelting experimental steel |
| CN105177221A (en) * | 2014-06-23 | 2015-12-23 | 鞍钢股份有限公司 | Method for removal of aluminum oxide inclusion from molten steel in refining process |
| CN105506220A (en) * | 2015-12-07 | 2016-04-20 | 武汉钢铁(集团)公司 | Method for adding bismuth during smelting of bismuth-containing high-magnetic-inductivity oriented silicon steel |
| CN107267712A (en) * | 2017-07-08 | 2017-10-20 | 淄博信晟机电技术有限公司 | The method that a small amount of low-density volatile metal is introduced into molten steel stove |
| CN109439839A (en) * | 2018-12-20 | 2019-03-08 | 山东钢铁股份有限公司 | A kind of charging packet for small intermediate frequency vaccum sensitive stove |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6442513A (en) * | 1987-08-07 | 1989-02-14 | Nisshin Steel Co Ltd | Method for adding metallic calcium into molten metal |
| US5094432A (en) * | 1990-03-07 | 1992-03-10 | Aluminium Pechiney | Container for adding light metal to an aluminium alloy in the liquid state |
| JPH1042513A (en) * | 1996-07-19 | 1998-02-13 | Ricoh Co Ltd | Fitting structure for motor |
-
2010
- 2010-11-20 CN CN2010105578166A patent/CN102477476A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6442513A (en) * | 1987-08-07 | 1989-02-14 | Nisshin Steel Co Ltd | Method for adding metallic calcium into molten metal |
| US5094432A (en) * | 1990-03-07 | 1992-03-10 | Aluminium Pechiney | Container for adding light metal to an aluminium alloy in the liquid state |
| JPH1042513A (en) * | 1996-07-19 | 1998-02-13 | Ricoh Co Ltd | Fitting structure for motor |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102899453A (en) * | 2012-10-23 | 2013-01-30 | 鞍钢股份有限公司 | Deoxidization and desulfuration integrated block |
| CN103014233A (en) * | 2013-01-16 | 2013-04-03 | 裴忠飞 | Sealing method of metallurgy material |
| CN103114172A (en) * | 2013-03-04 | 2013-05-22 | 内蒙古包钢钢联股份有限公司 | Calcium treatment method of vacuum induction furnace in smelting experimental steel |
| CN105177221A (en) * | 2014-06-23 | 2015-12-23 | 鞍钢股份有限公司 | Method for removal of aluminum oxide inclusion from molten steel in refining process |
| CN105506220A (en) * | 2015-12-07 | 2016-04-20 | 武汉钢铁(集团)公司 | Method for adding bismuth during smelting of bismuth-containing high-magnetic-inductivity oriented silicon steel |
| CN107267712A (en) * | 2017-07-08 | 2017-10-20 | 淄博信晟机电技术有限公司 | The method that a small amount of low-density volatile metal is introduced into molten steel stove |
| CN109439839A (en) * | 2018-12-20 | 2019-03-08 | 山东钢铁股份有限公司 | A kind of charging packet for small intermediate frequency vaccum sensitive stove |
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Application publication date: 20120530 |