CN102286666B - Process for preparing high-weight nickel ingots by vacuum melting method - Google Patents
Process for preparing high-weight nickel ingots by vacuum melting method Download PDFInfo
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- CN102286666B CN102286666B CN 201110188297 CN201110188297A CN102286666B CN 102286666 B CN102286666 B CN 102286666B CN 201110188297 CN201110188297 CN 201110188297 CN 201110188297 A CN201110188297 A CN 201110188297A CN 102286666 B CN102286666 B CN 102286666B
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Abstract
The invention relates to a process for preparing high-weight nickel ingots by a vacuum melting method, which comprises the following steps of: taking 40 percent of nickel raw materials, starting melting when the pressure is lower than -0.5MPa, lowering the temperature for continuous melting until the nickel raw materials are completely melted, gradually cooling and congealing nickel water and stopping melting; taking 40 percent of nickel raw materials, starting the melting when the pressure is lower than -0.75MPa, raising the temperature until the nickel raw materials are completely melted, gradually cooling and congealing the nickel water and stopping the melting; taking 20 percent of nickel raw materials, starting the melting at 430 to 630 DEG C during vacuum pumping, introducing argon gas when the pressure is lower than -0.1 MPa, raising the temperature for continuously melting and heating for a while until the nickel water is completely melted; adding deoxidizing agents and reducing the temperature for furnace swinging; and introducing argon gas for casting and preparing the nickel ingots. In the process, 500KG of nickel raw materials can be melted in one time and can be cast into nickel ingots with the weight being heavier than 500kg.
Description
Technical field
The present invention relates to the preparation technology of the above nickel ingot of a kind of nickel ingot preparation technology, especially 500KG, specifically a kind of technique with preparing high-weight nickel ingots by vacuum melting method.
Background technology
At present, the nickel strap volume that nickel strap manufacturing enterprise produces is heavy substantially all below 200KG, do not have to meet or exceed 500KG and roll up heavy, this mainly is to be subject to technology the most key in the nickel strap manufacture craft---melting, because weight specification obviously increases, and to physical size, performances etc. have been made strict regulation, make production technique more complicated, technology content is higher, because nickel and copper, iron, there is larger difference in the metallic substance such as steel aspect physical property, cause copper, iron, the melting method of the metallic substance such as steel can't be applicable among the melting of nickel, only can only rest on for many years once can the technology of a small amount of nickel of melting on, formed the development bottleneck of nickel strap processing industry.
The nickel starting material form the nickel ingot after casting through melting, the size of nickel ingot, quality have directly affected other operations such as rolling, itemize thereafter, cause the volume of the domestic nickel strap of China heavy generally less than normal, can not satisfy the nickel strap that adopts automatic assembly line to produce in the home and abroad and reprocess the Production requirement of enterprise, directly affect the development of China's nickel strap processing industry.In order to satisfy the demand of automatic production line, we must add the greatly heavy nickel strap preparation method's of volume R﹠D intensity, and the preparation prerequisite of the heavy nickel strap of large volume is exactly must have to supply the heavy weight nickel ingot of processing, yet prior art can't realize the preparation of large weight nickel ingot.
Summary of the invention
The objective of the invention is the problem that is difficult to prepare for large weight nickel ingot, propose a kind of technique with preparing high-weight nickel ingots by vacuum melting method; Nickel raw material that can the super 500KG of disposable melting is cast into the heavy nickel ingot of super 500KG.
Technical scheme of the present invention is:
A kind of technique with preparing high-weight nickel ingots by vacuum melting method, it may further comprise the steps:
(1), get the nickel raw material of 38%-42%, when pressure-when 0.5MPa is following, the beginning melting, melting 10-20 minute, temperature is risen to 1200-1400 ℃, continue melting, until after the nickel raw material all dissolves, make gradually cooled and solidified of nickel water, stop melting;
(2), get the nickel raw material of 38%-42%, when pressure-when 0.75MPa was following, the beginning melting rose to 1500-1700 ℃ with temperature, until after the nickel raw material all dissolves, make gradually cooled and solidified of nickel water, stopped melting;
(3), get the nickel raw material of 18%-22%, when vacuumizing, under 430-630 ℃, begin melting, when pressure reach-when 0.1MPa is following, pour argon gas, temperature is risen to 1500-1700 ℃, continue melting, until nickel water reheats 4-6 minute after dissolving fully;
(4), add reductor, after refining 55-65 minute, cool the temperature to 200-300 ℃, swing stove;
(5), be filled with argon gas, cast, make the nickel ingot.
In the step 4 of the present invention, nickel water arrives smelting furnace fire door 0.5-1.5cm place when swinging stove, swings stove 5-8 time, each 10-15 minute.
In the step 5 of the present invention, during casting, heat temperature raising,, be warming up to 1040-1080 ℃ by 350-390 ℃, pouring time 10-14 minute, be cooled to 775-815 ℃, stop melting after 13-17 minute, be incubated 4-6 minute, be filled with argon gas, after 9-11 minute, make the cooling of nickel ingot, make finished product.
In the step 5 of the present invention, during casting: at first, close the vacuum valve of smelting furnace, be filled with argon gas, at the uniform velocity cast, smelting furnace power is transferred to first 70KW, be heated to 371 ℃, in 11-13 minute, progressively be warmed up to again 477 ℃, 848 ℃, 1060 ℃; The complete rear feeding hole of casting; Transfer to 150KW with smelting furnace power this moment, is cooled to 795 ℃, closes smelting furnace after 15 minutes, again is filled with argon gas after 5 minutes, and blow-on after 10 minutes puts the nickel ingot to the cooling zone, pulls shrinkage cavity sawing line, with the shrinkage cavity completion, makes the nickel ingot after removing by the line saw at last.
The present invention adopts smelting furnace to carry out the melting of nickel ingot.
Beneficial effect of the present invention:
(1), vacuum smelting method of the present invention can the super 500KG of disposable melting the nickel raw material, be cast into the heavy nickel ingot of super 500KG.
(2), adopt vacuum smelting method of the present invention can guarantee that nickel content reduces sulfur impurity the most harmful in the nickel, the content of phosphorus effectively more than 99.999% in the nickel ingot, sulphur, phosphorus are dropped to respectively below the 10ppm, improved the erosion resistance of nickel strap.
(3), adopt the nickel ingot resistivity of vacuum smelting method preparation of the present invention little, ρ≤0.068 Ω mm2/M; Possesses good conductivity.
(4), the nickel ingot is homogeneous, processability is strong, can improve its impelling strength 80%, creep rupture strength and unit elongation improve respectively 30%, relative reduction in area improves 50%.
(5), adopt vacuum smelting method of the present invention, the gas in the nickel can be discharged rapidly, decrease the oxide slag inclusion thing of melt, melt need not be carried out and cover agent and flux, has guaranteed not vulnerable to pollution of melt, more energy-conserving, environment protection.
Embodiment
The present invention is further illustrated below in conjunction with embodiment.
A kind of technique with preparing high-weight nickel ingots by vacuum melting method, it may further comprise the steps:
(1), get the nickel raw material of 38%-42%, when pressure-when 0.5MPa is following, the beginning melting, melting 10-20 minute, temperature is risen to 1200-1400 ℃, continue melting, until after the nickel raw material all dissolves, make gradually cooled and solidified of nickel water, stop melting;
(2), get the nickel raw material of 38%-42%, when pressure-when 0.75MPa was following, the beginning melting rose to 1500-1700 ℃ with temperature, until after the nickel raw material all dissolves, make gradually cooled and solidified of nickel water, stopped melting;
(3), get the nickel raw material of 18%-22%, when vacuumizing, under 430-630 ℃, begin melting, when pressure reach-when 0.1MPa is following, pour argon gas, temperature is risen to 1500-1700 ℃, continue melting, until nickel water reheats 4-6 minute after dissolving fully;
(4), add reductor, after refining 55-65 minute, cool the temperature to 200-300 ℃, swing stove;
(5), be filled with argon gas, cast, make the nickel ingot.
Embodiment one:
A kind of technique with preparing high-weight nickel ingots by vacuum melting method, it may further comprise the steps:
(1) get an amount of nickel raw material, drop into vacuum melting furnace at reasonable time minutes for three times:
Reinforced for the first time: the raw material of adding 2/5, build bell, find time air in the smelting furnace, make that pressure reaches in the stove-below the 0.5MPa, begin energising and carry out melting this moment, first smelting furnace power is transferred to about 250KW and heated about 15 minutes, heating makes the interior temperature of stove rise to 1300 ℃, transfer to 300KW with smelting furnace power this moment, make and continue melting after temperature rises to 1600 ℃ fast in the stove, until close the vacuum pump valve after material in the stove all dissolved, smelting furnace power is turned down gradually until close, make and open bell after nickel water solidifies gradually in the stove, prepare reinforced for the second time.
For the second time reinforced: as to add again 2/5 raw material, find time air in the smelting furnace, make that pressure reaches in the stove-below the 0.75MPa, begin energising and carry out melting this moment, smelting furnace power is directly transferred to about 300KW heating make that temperature rises to 1600 ℃ fast in the stove, until close the vacuum pump valve after material all dissolves in the stove, smelting furnace directly cuts out, make and open bell after nickel water solidifies gradually in the stove, prepare reinforced for the third time.
Reinforced for the third time: at this moment necessary cleaning mold mouth, guarantee that mould inner wall is smooth, the whole fastenings of bolt, guarantee the distortion of billet non-trimming, mould is put into stove over against fire door, reductor is put in the bell, wipe clean the combining glass on the bell in order to observe in the fusion process.Put at last 1/5 remaining raw material, build bell, when vacuumizing smelting furnace power transferred to that energising is heated to 530 ℃ about 100KW, until pressure in the stove is reached-below the 0.1MPa, pour argon gas, smelting furnace power is transferred to 300KW, be warming up to 1590 ℃, continue melting, until nickel water reheats 5 minutes after dissolving fully, again add reductor this moment, refining after 60 minutes is turned down power to the 50KW, near 265 ℃ of temperature, and swing stove, nickel water must arrive about smelting furnace fire door 1cm when swinging stove, at least need swing stove 5 times, about 10 minutes once, in order to reductor can be contacted with the nickel water equably, fast the gas of nickel water discharged.
(2) casting: close vacuum valve, be filled with argon gas, cast, during casting smelting furnace power is transferred to first 70KW, progressively bring up to 90KW, 160KW, 200KW according to the casting situation again, pouring time should be controlled at about 12 minutes, should at the uniform velocity cast during casting.Casting needs the feeding hole after complete, and should transfer to 150KW this moment with smelting furnace power, closes smelting furnace after about 15 minutes, again is filled with argon gas, blow-on after 10 minutes after 5 minutes.After coming out of the stove the nickel ingot is put to the cooling zone, pulled shrinkage cavity sawing line, shrinkage cavity must be mended fully, namely can be made into satisfactory nickel ingot after removing by the line saw at last.
The part that the present invention does not relate to all prior art that maybe can adopt same as the prior art is realized.
Claims (5)
1. technique with preparing high-weight nickel ingots by vacuum melting method is characterized in that it may further comprise the steps:
(1), get the nickel raw material of 38%-42%, when pressure-when 0.5MPa is following, the beginning melting, melting 10-20 minute, temperature is risen to 1200-1400 ° of C, continue melting, until after the nickel raw material all dissolves, make gradually cooled and solidified of nickel water, stop melting;
(2), get the nickel raw material of 38%-42%, when pressure-when 0.75MPa was following, the beginning melting rose to 1500-1700 ° of C with temperature, until after the nickel raw material all dissolves, make gradually cooled and solidified of nickel water, stopped melting;
(3), get the nickel raw material of 18%-22%, when vacuumizing, under 430-630 ° of C, begin melting, when pressure reach-when 0.1MPa is following, pour argon gas, temperature is risen to 1500-1700 ° of C, continue melting, until nickel water reheats 4-6 minute after dissolving fully;
(4), add reductor, after refining 55-65 minute, cool the temperature to 200-300 ° of C, swing stove;
(5), be filled with argon gas, cast, make the nickel ingot.
2. the technique with preparing high-weight nickel ingots by vacuum melting method according to claim 1 is characterized in that in the step 4, and nickel water arrives smelting furnace fire door 0.5-1.5cm place when swinging stove, swings stove 5-8 time, each 10-15 minute.
3. the technique with preparing high-weight nickel ingots by vacuum melting method according to claim 1 is characterized in that in the step 5, during casting, heat temperature raising, be warming up to 1040-1080 ° of C by 350-390 ° of C, pouring time 10-14 minute, be cooled to 775-815 ° of C, stop melting after 13-17 minute, be incubated 4-6 minute, be filled with argon gas, after 9-11 minute, make the cooling of nickel ingot, make finished product.
4. the technique with preparing high-weight nickel ingots by vacuum melting method according to claim 3, it is characterized in that in the step 5, during casting: at first, close the vacuum valve of smelting furnace, be filled with argon gas, at the uniform velocity cast, smelting furnace power is transferred to first 70KW, be heated to 371 ° of C, in 11-13 minute, progressively be warmed up to again 477 ° of C, 848 ° of C, 1060 ° of C; The complete rear feeding hole of casting; Transfer to 150KW with smelting furnace power this moment, is cooled to 795 ° of C, closes smelting furnace after 15 minutes, again be filled with argon gas after 5 minutes, blow-on after 10 minutes puts the nickel ingot to the cooling zone, pull shrinkage cavity sawing line, with the shrinkage cavity completion, make the nickel ingot after removing by the line saw at last.
5. the technique with preparing high-weight nickel ingots by vacuum melting method according to claim 1 is characterized in that adopting smelting furnace to carry out the melting of nickel ingot.
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| CN 201110188297 CN102286666B (en) | 2011-07-06 | 2011-07-06 | Process for preparing high-weight nickel ingots by vacuum melting method |
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| CN 201110188297 CN102286666B (en) | 2011-07-06 | 2011-07-06 | Process for preparing high-weight nickel ingots by vacuum melting method |
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| CN102286666B true CN102286666B (en) | 2013-03-13 |
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| CN112553486A (en) * | 2020-12-01 | 2021-03-26 | 无锡市东杨新材料股份有限公司 | Smelting process for improving quality of nickel ingot |
| CN115351245A (en) * | 2022-07-27 | 2022-11-18 | 江苏远航精密合金科技股份有限公司 | Method for improving yield of high-purity nickel ingot casting material for electronic industry |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1503850A (en) * | 2001-03-08 | 2004-06-09 | ATI�ʲ���˾ | Method for producing large diameter ingots of nickel base alloys |
| CN101307429A (en) * | 2008-07-14 | 2008-11-19 | 中南大学 | Process for preparing high-purity metallic nickel target of superfine crystal particle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1503850A (en) * | 2001-03-08 | 2004-06-09 | ATI�ʲ���˾ | Method for producing large diameter ingots of nickel base alloys |
| CN101307429A (en) * | 2008-07-14 | 2008-11-19 | 中南大学 | Process for preparing high-purity metallic nickel target of superfine crystal particle |
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Address after: 214205 Jiangsu city of Wuxi province Yixing city huankeyuan Luyuan Road Applicant after: JIANGSU SINONIC PRECISION ALLOY TECHNOLOGY CO., LTD. Address before: 214205 Jiangsu city of Wuxi province Yixing city huankeyuan Luyuan Road Applicant before: Jiangsu Yuanhang Precision Alloy Technology Co., Ltd. |
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