CN102477473A - Method for controlling boron content of boron-containing steel smelted by vacuum induction furnace - Google Patents
Method for controlling boron content of boron-containing steel smelted by vacuum induction furnace Download PDFInfo
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- CN102477473A CN102477473A CN2010105577572A CN201010557757A CN102477473A CN 102477473 A CN102477473 A CN 102477473A CN 2010105577572 A CN2010105577572 A CN 2010105577572A CN 201010557757 A CN201010557757 A CN 201010557757A CN 102477473 A CN102477473 A CN 102477473A
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Abstract
The invention relates to a method for controlling the boron content of boron-containing steel smelted by a vacuum induction furnace, which includes the steps: I preparing a crucible for smelting steel not less than the quantity of steel in 5 furnaces, II preparing raw materials and placing iron boron and aluminum pills into an alloy hopper, III charging pure iron or scrap steel and iron alloy or return scrap into the crucible and charging silicon iron, manganese metal and iron boron into the hopper, IV closing a furnace cover, vacuumizing to enable the pressure in the furnace not more than 10Pa and heating the furnace charge by means of power supply, V smelting the furnace charge with the smelting speed not more than one half of the maximum capacity of one furnace per hour, VI turning into high-vacuum refining for 18-22 minutes when the raw materials are smelted into molten steel and the pressure in the furnace is not more than 2.0 Pa, VII filling argon into the furnace after vacuumizing stops, VIII alloying by regulating other components under protection of the argon, IX performing final deoxidization, and X adding iron boron for smelting. By the aid of the method, the boron quantity increase is not more than 0.0005%, and fluctuation of boron in the steel is not more than +/-0.001%.
Description
Technical field
The present invention relates to a kind of method of vacuum induction furnace smelting boron-containing steel control boron content.
Background technology
Boron is the microalloying element in steel or the alloy, and intensity and the hardening capacity that improves steel is played an important role, and boron is more active element, and under the steel-making temperature, boron is oxidation very easily.The method of existing vacuum induction furnace smelting boron-containing steel control boron content is to smelt the later stage to add ferro-boron and increase boron, because oxygen reaction in boron and the molten steel, the boron recovery is below 80%, and all contains sticker boric acid (H owing in the crucible refractory material
3BO
3), in the process of steel-making, decompose, cause molten steel to increase boron, increase the boron amount between 0.001-0.003%.So the fluctuation range of boron is generally 0.005%, be difficult to satisfy the accurate control of steel grade boron content.
Summary of the invention
Control the above-mentioned deficiency of the method for boron content in order to overcome existing vacuum induction furnace smelting boron-containing steel; The present invention provides a kind of method of vacuum induction furnace smelting boron-containing steel control boron content; Adopt method of the present invention to increase the boron amount and be not more than 0.0005%, in the steel fluctuation range of boron be not more than ± 0.001%.
Technical scheme of the present invention is when the vacuum induction furnace smelting boron-containing steel; Take limits boron melting loss of elements and crucible refractory material to increase boron two aspect technological factors: high vacuum is smelted latter stage; In stove, charge into argon shield; The Al deoxidation of adding 0.05% adds ferro-boron then, makes the recovery 98%-99.5% of boron; Fire proof material of furnace lining mesoboric acid consumption takes off limit 0.8%, and after the crucible access times surpass 5 stoves, smelts boron-containing steel again, make to increase the boron amount and be not more than 0.001%, in the steel fluctuation range of boron be not more than ± 0.001%.
The method that this high vacuum induction furnace is smelted boron-containing steel control boron content comprises following sequential steps:
I prepares crucible
Used crucible is the crucible with the electrosmelted magnesite clinker knotting, and the weight proportion of the material mesoboric acid of knotting crucible is 0.75%-0.85%, and steel-making is no less than 5 stoves behind the crucible sintering.
II prepares raw material
According to the per distribution ratio of boron content in the boracic steel grade and smelt the weight of boracic steel grade, calculate the weight of the ferro-boron that needs to add, put into the alloy hopper to the good ferro-boron of scale.The aluminum shot that accounts for molten steel weight 0.045%-0.055% is also packed in the hopper simultaneously.
The III charging
In the crucible of the pure iron of clean dry (or home scrap), iron alloy (selecting extra low carbon ferrochromium, chromium metal, nickel beans, molybdenum-iron etc. to contain the iron alloy of the element of not volatile and the oxidation) vacuum induction furnace of packing into according to steel grades, ferrosilicon, manganese metal, the ferro-boron hopper of packing into.
IV closes bell and vacuumizes
Close bell.Vacuumized 12-16 minute, and when pressure is not more than 10Pa in the stove, sent the electrically heated furnace charge.
The V melting batch
Send furnace charge in the electrofusion crucible, burn-off rate≤1/2 stove maximum capacity/hour.
The VI refining
The interior solid material of crucible of packing into all is fused into molten steel, when the pressure in the stove is not more than 2.0Pa, changes the high vacuum refining over to, and refining vacuum tightness 0.4Pa-0.6Pa is generally 0.5Pa, refining time 18-22 minute, is generally 20 minutes.
The VII inflation
Refining is closed vacuum pump after finishing, and stops to vacuumize, and in stove, charges into argon gas, and applying argon gas pressure is not less than 10
4Pa.
The VIII alloying
Under the protection of argon gas, according to the steel grade of boron-containing steel, other composition outside the adjustment boron composition makes other composition meet the requirement of steel grade.
The IX final deoxygenation
Add the aluminum shot deoxidation, add-on is the 0.045%-0.055% of molten steel weight.
X adds ferro-boron
The ferro-boron of hopper of will packing into is added to melting in the crucible.
After melting finishes, steel tapping casting.In order to guarantee that molten steel do not lower the temperature at casting process, guarantee that cast carries out smoothly, adopt the mode of charged cast that molten steel is poured in the ingot mold.
The method of this vacuum induction furnace smelting boron-containing steel control boron content through reducing the consumption of crucible refractory material boric acid, is refined the content boron steel after new crucible refines five stoves again, controls to increase the boron amount, increases the boron amount and is not more than 0.0005%; Through increasing the aluminium deoxidation link latter stage in refining, the content of oxygen and nitrogen adds boron again in the reduction molten steel, to improve the boron recovery to 98%-99.5%.Send electrically heated again when pressure is not more than 10Pa in the stove, help fully removing moisture in the stove, avoid the element oxidational losses.Furnace charge owing to the effect of vacuum, can be removed the trace harmful elements and the sulphur of a part of gas, high vapour pressure in melting process.
For furnace charge fully degass in melting process and normal fusing, big splash does not take place, guarantee the condition of high vacuum degree in the stove, the control burn-off rate be not more than stove maximum capacity 1/2nd, make steel in melting process because gas is fully removed in the effect of vacuum.The high vacuum refining can be removed a part of gas, reduces oxygen level in the steel, improves the REE yield.Charging into argon gas can prevent to stop to vacuumize in the air admission stove of back.The Al deoxidation of adding 0.05% can reduce oxygen level in the molten steel, avoids the oxidational losses of boron.Sneak in the steel stream of cast for fear of teeming temperature decline and sull during steel tapping casting, adopt charged cast.
The method of this vacuum induction furnace smelting boron-containing steel control boron content is applicable to the boracic steel grade of boron content≤0.01%.Operation is simple and reliable for present method, increases boron and two links of boron scaling loss through control, reaches the effect of accurate control boron content, in the steel fluctuation range of boron be not more than ± 0.001%.
Embodiment
Specify the embodiment that this vacuum induction furnace smelting boron-containing steel is controlled the method for boron content below in conjunction with embodiment, but embodiment of the present invention is not limited to following embodiment.
Embodiment one
Equipment adopts the 200kg high vacuum induction furnace: final vacuum is 6.67 * 10
-2Pa, power are 250KW, and frequency is 2500HZ, batch 100kg.Steel grade: welding wire steel EQ316L
The present invention smelts a stove EQ316L steel needs steel scrap, alloy and ferro-boron weight to see table 1, and the standard analysis and the controlled target of EQ316L composition are seen table 2.
Table 1
| Raw material type | 308 steel scraps | Electrolytic manganese | Chromium metal | The nickel beans | Molybdenum-iron | Special silicon | Electrolytic copper | Ferro-boron | Aluminum shot |
| Add-on (kg) | ?87.8 | 0.5 | 1.8 | 4.5 | 4.8 | 0.38 | 0.15 | 0.03 | 0.05 |
Table 2
Present embodiment is the step of next coming in order:
I prepares crucible
Used crucible is the crucible with the electrosmelted magnesite clinker knotting, and the weight proportion of the material mesoboric acid of knotting crucible is 0.8%, refines 5 stove steel behind the crucible sintering.
II prepares raw material
0.030kg ferro-boron and 0.05kg aluminum shot are packed in the hopper.
The III charging
Pack 308 steel scraps, chromium metal, nickel beans, molybdenum-iron in the hopper into, special silicon, electrolytic manganese, electrolytic copper are put into feed bin.
IV closes bell and vacuumizes
Close bell and vacuumized 15 minutes, when pressure reaches 5Pa in the stove, send electric power 40KW, progressively send into superpower 120KW.
The V melting batch
The burn-off rate 50kg/ of furnace charge hour.
The VI refining
The interior solid material of stove of packing into all is fused into molten steel, when the pressure in the stove reaches 2.0Pa, changes the high vacuum refining over to, refining vacuum tightness 0.5Pa, refining time 20 minutes.
The VII inflation
Refining is closed vacuum pump after finishing, and stops to vacuumize, and in stove, charges into argon gas, and applying argon gas pressure is 104Pa.
The VIII alloying
Under the protection of argon gas, successively special silicon, electrolytic manganese and electrolytic copper are added in the molten steel, melted 5 minutes.
The IX final deoxygenation adds the deoxidation of 0.05kg aluminum shot.
X adds will pack into the 0.030kg ferro-boron of hopper of ferro-boron and is added to melting in the crucible.
The XI steel tapping casting
Adopt the mode of charged cast, molten steel is poured in the ingot mold.
The quality per distribution ratio of the chemical ingredients of Finished Steel (ingot casting) is seen table 3.
Table 3
| C％ | Si％ | Mn％ | P | S | Cr％ | Ni | Mo | Cu | B |
| 0.013 | 0.36 | 1.82 | 0.009 | 0.005 | 18.43 | 12.62 | 2.85 | 0.16 | 0.0045 |
Boron is than add-on deviation-0.0005%.
Embodiment two
Equipment adopts the 200kg high vacuum induction furnace: final vacuum is 6.67 * 10
-2Pa, power are 250KW, and frequency is 2500HZ, batch 100kg.Steel grade: stainless steel UNS N08926
The present invention smelts a stove UNS N08926 steel needs pure iron, alloy and ferro-boron weight (kg) to see table 4, and UNS N08926 standard analysis and controlled target are seen table 5.
Table 4
| Raw material type | Pure iron | Chromium nitride | Nitrogenized manganese | Chromium metal | The nickel beans | Molybdenum-iron | Special silicon | Electrolytic copper | Ferro-boron | Aluminum shot |
| Add-on | 41.0 | 1.8 | 1.4 | 19.8 | 25.3 | 10.5 | 0.24 | 1.05 | 0.019 | 0.05 |
Table 5
Present embodiment is the step of next coming in order:
I prepares crucible
Used crucible is the crucible with the electrosmelted magnesite clinker knotting, and the weight proportion of the material mesoboric acid of knotting crucible is 0.8%, refines 6 stove steel behind the crucible sintering.
II prepares raw material
0.019kg ferro-boron and 0.05kg aluminum shot are packed in the hopper.
The III charging
Pack pure iron, chromium metal, nickel beans, molybdenum-iron in the hopper into, special silicon, chromium nitride, nitrogenized manganese and electrolytic copper are put into feed bin.
IV closes bell and vacuumizes
Close bell and vacuumized 15 minutes, when pressure reaches 5Pa in the stove, send electric power 40KW, progressively send into superpower 120KW.
The V melting batch
Burn-off rate≤the 50kg/ of furnace charge hour.
The VI refining
The interior solid material of stove of packing into all is fused into molten steel, when the pressure in the stove reaches 2.0Pa, changes the high vacuum refining over to, refining vacuum tightness 0.5Pa, refining time 20 minutes.
The VII inflation
Refining is closed vacuum pump after finishing, and stops to vacuumize, and in stove, charges into argon gas, and applying argon gas pressure is 0.3 normal atmosphere (3 * 10
4Pa).
The VIII alloying
Under the protection of argon gas, successively special silicon, nitrogenized manganese and electrolytic copper are added in the molten steel, melted 5 minutes.
The IX final deoxygenation
Add the deoxidation of 0.05kg aluminum shot.
X adds ferro-boron
The 0.019kg ferro-boron of hopper of will packing into is added to melting in the crucible.
The XI steel tapping casting
Adopt the directly mode of cast, molten steel is poured in the ingot mold.
The quality per distribution ratio of the chemical ingredients of Finished Steel (ingot casting) is seen table 6.
The quality per distribution ratio of the chemical ingredients of table 6 Finished Steel (ingot casting)
| C％ | Si％ | Mn％ | P％ | S％ | Cr％ | Ni％ | Mo％ | Cu％ | N％ | B％ |
| 0.012 | 0.29 | 1.32 | 0.007 | 0.009 | 20.36 | 25.2 | 6.27 | 1.04 | 0.20 | 0.0036 |
All the other are Fe and unavoidable impurities.
Boron is than add-on deviation+0.0006%.
Embodiment three
Equipment adopts the 200kg high vacuum induction furnace: final vacuum is 6.67 * 10
-2Pa, power are 250KW, and frequency is 2500HZ, batch 100kg.Steel grade: oriented silicon steel N1
The present invention smelts a stove oriented silicon steel N1 steel needs pure iron, alloy and ferro-boron weight to see table 7, and the standard analysis and the controlled target of N1 composition are seen table 8.
Table 7
Table 8
Present embodiment is the step of next coming in order:
I prepares crucible
Used crucible is the crucible with the electrosmelted magnesite clinker knotting, and the weight proportion of the material mesoboric acid of knotting crucible is 0.8%, refines 8 stove steel behind the crucible sintering.
II prepares raw material
0.030kg ferro-boron and 0.05kg aluminum shot are packed in the hopper.
The III charging
Pack pure iron in the hopper into, all the other alloys are put into feed bin.
IV closes bell and vacuumizes
Close bell and vacuumized 15 minutes, when pressure reaches 8Pa in the stove, send electric power 40KW, progressively send into superpower 120KW.
The V melting batch
The burn-off rate 50kg/ of furnace charge hour.
The VI refining
The interior solid material of stove of packing into all is fused into molten steel, when the pressure in the stove reaches 2.0Pa, changes the high vacuum refining over to, refining vacuum tightness 0.3Pa, refining time 20 minutes.
The VII inflation
Refining is closed vacuum pump after finishing, and stops to vacuumize, and in stove, charges into argon gas, and applying argon gas pressure is 10
4Pa.
The VIII alloying
Under the protection of argon gas, successively special silicon, manganese metal, carburelant, ferrophosphorus, ferro-silicon nitride are added in the molten steel, melted 5 minutes.
The IX final deoxygenation adds the deoxidation of 0.05kg aluminum shot.
X adds will pack into the 0.030kg ferro-boron of hopper of ferro-boron and is added to melting in the crucible.
The XI steel tapping casting adopts the mode of charged cast, and molten steel is poured in the ingot mold.
The quality per distribution ratio of the chemical ingredients of Finished Steel (ingot casting) is seen table 9.
Table 9
| C％ | Si％ | Mn％ | P％ | S％ | N％ | Al％ | B％ |
| 0.052 | 3.18 | 0.138 | 0.02 | 0.004 | 0.0061 | 0.027 | 0.0048 |
Boron is than add-on deviation-0.0002%.
The described composition of the application all is meant the quality per distribution ratio.
The described steel scrap of present specification comprises home scrap, and home scrap is meant some element that comprises in institute's steelmaking kind composition, does not contain other element that institute's steelmaking kind is polluted again.Can reduce the iron alloy consumption with home scrap,, reduce cost, the instead of part iron alloy like chromium, nickelalloy.
Claims (1)
1. the method for vacuum induction furnace smelting boron-containing steel control boron content, it comprises following sequential steps:
I prepares crucible
Used crucible is the crucible with the electrosmelted magnesite clinker knotting, and the weight proportion of the material mesoboric acid of knotting crucible is 0.75%-0.85%, and steel-making is no less than 5 stoves behind the crucible sintering;
II prepares raw material
According to the per distribution ratio of boron content in the boracic steel grade and smelt the weight of boracic steel grade, calculate the weight of the ferro-boron that needs to add, put into the alloy hopper to the good ferro-boron of scale.The aluminum shot that accounts for molten steel weight 0.045%-0.055% is also packed in the hopper simultaneously;
The III charging
Pack the pure iron of clean dry or home scrap, iron alloy in the crucible of vacuum induction furnace into ferrosilicon, manganese metal, the ferro-boron hopper of packing into;
IV closes bell and vacuumizes
Close bell and vacuumized 12-16 minute, when pressure is not more than 10Pa in the stove, send the electrically heated furnace charge;
The V melting batch
Send furnace charge in the electrofusion crucible, burn-off rate≤1/2 stove maximum capacity/hour;
The VI refining
The interior solid material of crucible of packing into all is fused into molten steel, when the pressure in the stove is not more than 2.0Pa, changes the high vacuum refining over to, refining vacuum tightness 0.4Pa-0.6Pa refining time 18-22 minute;
The VII inflation
Refining is closed vacuum pump after finishing, and stops to vacuumize, and in stove, charges into argon gas, and applying argon gas pressure is not less than 10
4Pa;
The VIII alloying
Under the protection of argon gas, according to the steel grade of boron-containing steel, other composition outside the adjustment boron composition makes other composition meet the requirement of steel grade;
The IX final deoxygenation
Add the aluminum shot deoxidation, add-on is the 0.045%-0.055% of molten steel weight;
X adds ferro-boron
The ferro-boron of hopper of will packing into is added to melting in the crucible.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103451362A (en) * | 2013-08-26 | 2013-12-18 | 江苏大学 | Method for carrying out boron microalloying on steel by using boric acid instead of ferroboron |
| CN104451030A (en) * | 2014-12-03 | 2015-03-25 | 河北钢铁股份有限公司 | Method for accurately controlling boron content during smelting of boron-containing steel in vacuum induction furnace |
| CN106756440A (en) * | 2017-03-15 | 2017-05-31 | 常熟理工学院 | A kind of smelting process of precise control boron-containing alloy steel Boron contents |
| CN113278810A (en) * | 2021-04-15 | 2021-08-20 | 山西太钢不锈钢股份有限公司 | Smelting control method for vacuum induction furnace in melting period |
| CN113560509A (en) * | 2021-07-27 | 2021-10-29 | 上海电气上重铸锻有限公司 | Method for manufacturing low-silicon boron-controlled steel large steel ingot |
| CN114293090A (en) * | 2022-01-07 | 2022-04-08 | 鞍钢股份有限公司 | Method for controlling manganese content in smelting titanium-containing steel in vacuum induction furnace |
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| CN101250659A (en) * | 2008-04-08 | 2008-08-27 | 莱芜钢铁股份有限公司 | Method for improving and stabilising boron recovery rate for vacuum smelting steel containing boron |
| CN101372721A (en) * | 2008-09-19 | 2009-02-25 | 山西太钢不锈钢股份有限公司 | High vacuum induction furnace nitrogen-containing steel smelting nitrogen pickup method |
| CN101451209A (en) * | 2007-12-05 | 2009-06-10 | 舞阳钢铁有限责任公司 | Method for adding ferroboron during steel smelting process |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103451362A (en) * | 2013-08-26 | 2013-12-18 | 江苏大学 | Method for carrying out boron microalloying on steel by using boric acid instead of ferroboron |
| CN104451030A (en) * | 2014-12-03 | 2015-03-25 | 河北钢铁股份有限公司 | Method for accurately controlling boron content during smelting of boron-containing steel in vacuum induction furnace |
| CN104451030B (en) * | 2014-12-03 | 2016-03-30 | 河北钢铁股份有限公司 | The accuracy control method of Boron contents during vacuum induction furnace smelting boron-containing steel |
| CN106756440A (en) * | 2017-03-15 | 2017-05-31 | 常熟理工学院 | A kind of smelting process of precise control boron-containing alloy steel Boron contents |
| CN113278810A (en) * | 2021-04-15 | 2021-08-20 | 山西太钢不锈钢股份有限公司 | Smelting control method for vacuum induction furnace in melting period |
| CN113560509A (en) * | 2021-07-27 | 2021-10-29 | 上海电气上重铸锻有限公司 | Method for manufacturing low-silicon boron-controlled steel large steel ingot |
| CN113560509B (en) * | 2021-07-27 | 2023-02-24 | 上海电气上重铸锻有限公司 | Method for manufacturing low-silicon boron-controlled steel large steel ingot |
| CN114293090A (en) * | 2022-01-07 | 2022-04-08 | 鞍钢股份有限公司 | Method for controlling manganese content in smelting titanium-containing steel in vacuum induction furnace |
| CN114293090B (en) * | 2022-01-07 | 2022-10-18 | 鞍钢股份有限公司 | Method for controlling manganese content in smelting titanium-containing steel in vacuum induction furnace |
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