CN101804535A - Method for preparing parent metal of nuclear-electric welding material with ultrahigh purity - Google Patents
Method for preparing parent metal of nuclear-electric welding material with ultrahigh purity Download PDFInfo
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- CN101804535A CN101804535A CN 201010131840 CN201010131840A CN101804535A CN 101804535 A CN101804535 A CN 101804535A CN 201010131840 CN201010131840 CN 201010131840 CN 201010131840 A CN201010131840 A CN 201010131840A CN 101804535 A CN101804535 A CN 101804535A
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- welding material
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- ingot
- feed trumpet
- pouring
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- 239000002184 metal Substances 0.000 title claims abstract description 25
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 25
- 239000000463 material Substances 0.000 title claims abstract description 21
- 238000003466 welding Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 24
- 239000010959 steel Substances 0.000 claims abstract description 24
- 238000005516 engineering process Methods 0.000 claims abstract description 23
- 238000005266 casting Methods 0.000 claims abstract description 21
- 230000006698 induction Effects 0.000 claims abstract description 6
- 238000005096 rolling process Methods 0.000 claims abstract description 5
- 238000005242 forging Methods 0.000 claims abstract description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 7
- 230000003749 cleanliness Effects 0.000 claims description 6
- 238000001746 injection moulding Methods 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 5
- 229910001018 Cast iron Inorganic materials 0.000 claims description 4
- 239000000395 magnesium oxide Substances 0.000 claims description 4
- 239000011819 refractory material Substances 0.000 claims description 2
- 239000003643 water by type Substances 0.000 claims description 2
- 239000012535 impurity Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000003723 Smelting Methods 0.000 abstract description 4
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract 2
- 238000007667 floating Methods 0.000 description 10
- 238000011084 recovery Methods 0.000 description 5
- 229910052755 nonmetal Inorganic materials 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 238000005253 cladding Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
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Abstract
The invention belongs to the research field of welding materials, relating to a method for preparing a parent metal of a nuclear-electric welding material with ultrahigh purity. The method is characterized in comprising the following steps of: adopting a normal vacuum induction smelting furnace; pouring an ingot mold from the bottom through a central casting pipe of a pouring mould to obtain a cast ingot; and performing the steps of electrical slagging, forging, rolling and drawing to finally obtain the welding material. The pouring mould consists of three parts which comprise the central casting pipe, a bottom pouring way and the ingot mold, wherein liquid steel is evenly smelted in a crucible, and is firstly poured into the central casting pipe and secondly into the ingot mold from the bottom when pouring. As the existing vacuum upper pouring technology is replaced with a new vacuum bottom pouring liquid steel technology, the parent metal of the welding material is prepared; and with the steps of the electrical slagging, the forging, the rolling and the drawing, the synthetical impurity content (comprising oxide, sulfide, nonmetallic inclusion, gas and the like) of the welding material can be reduced from 200-300ppm to be lower than 100ppm, thereby greatly improving the purity of a cast ingot and the structural homogeneity, improving the yield, and reducing the production cost.
Description
Technical field
The invention belongs to the welding material research field, relate to a kind of method for preparing parent metal of nuclear-electric welding material with ultrahigh purity.
Background technology
Energy problem has become restriction World Economics and the environment bottleneck of balanced growth continuously and healthily, and nuclear power becomes at present one of regenerative resource of the most suitable development as a kind of cleaning, efficient, safe, economic novel energy.State Council in 2007 have also ratified " the medium-term and long-term development plan of national nuclear power " of the Committee of Development and Reform, and preliminary planning target the year two thousand twenty builds up 4,000 ten thousand kilowatts of installed capacitys, and really accomplish nuclear power field autonomous Design, autonomous construction, autonomous manufacturing, autonomous operation.
Have the large-scale advanced nuclear power technology with independent intellectual property right, be the dream of China's energy and nuclear power circle always.Only have the large-scale advanced nuclear power technology with independent intellectual property right, China could be transformed into " nuclear power power " by " nuclear power big country ".Wherein the production of nuclear power generating equipment autonomy-oriented is a very important ring, China just is devoted to the scientific research that nuclear power generating equipment is made since the seventies in last century, especially carry out key breakthrough with closely-related material of nuclear power and process technology, nuclear power generating equipment has all been realized production domesticization manufacturing with high-quality steel major part at present, and this domesticizes fully for acceleration China nuclear power technology and has very important facilitation.But it should be noted that, the development of the employed high-grade wlding of welding but seriously lags behind the development of steel between the relevant steel, and major part is dependence on import always also, and domestic still do not possess the ability that domesticizes fully, main cause is the production domesticization wlding, especially the silk material is organized evenly inadequately, and degree of purity is compared lower abroad, causing being difficult to be drawn into diameter is the following silk material of 3mm, and lumber recovery is also lower, unstable properties, and the performance of welding back cladding metal can not satisfy instructions for use.
Analyze wlding both domestic and external on the contrast market, the essential element composition that can find wlding does not have difference substantially, difference mainly is that the structural homogenity and the comprehensive impurity content (comprising nonmetal inclusion and gas etc.) of domestic wlding is bigger with external difference, it is relatively poor to cause welding back cladding metal strength and toughness, can not meet the demands.Wlding (comprising welding rod and welding wire etc.) mainly is by the rolling and drawing through multi-pass obtains to steel ingot, its structural homogenity and degree of purity directly depend on the structural homogenity and the degree of purity of mother metal steel ingot, and the high-cleanness, high of steel ingot is the strong guarantee of distortion back wlding high-cleanness, high.At present the mother metal steel ingot mainly adopts vacuum induction melting to become ingot casting to carry out electroslag remelting process again to prepare, and vacuum induction melting technology has directly determined the structural homogenity and the impurity content of steel ingot.During present domestic employing vacuum induction melting technology smelting ingot casting, in vacuum chamber, treat all to adopt after pyrolytic semlting evenly directly above the ingot mould molten steel impouring ingot mould, just go up the method for annotating and carry out ingot steel casting, so cause being mingled with easily with gas etc. and have little time come-up, along with solidification of molten steel remains in the steel ingot, cause degree of purity to reduce, can not satisfy the quality requirement of nuclear power the wlding harshness.
Summary of the invention
The object of the invention provides a kind of method for preparing parent metal of nuclear-electric welding material with ultrahigh purity, and overcoming on the vacuum to annotate to be mingled with in the technology does not have sufficient floating interval of floating dock with gas and remain in drawback in the ingot casting, and it is less to solidify the ingot casting shrinkage cavity, has improved lumber recovery.
A kind of method for preparing high cleanliness nuclear-electric welding material mother metal is characterized in that: adopt conventional vacuum induction melting furnace, the technology of injecting ingot mould by the feed trumpet that waters injection molding from the bottom obtains ingot casting, and then carry out electroslag, forging and rolling, drawing finally obtains wlding; Watering injection molding is located in the vacuum chamber, constitute by three parts, comprise feed trumpet 1, bottom running channel 2 and ingot mould 3, after molten steel melting in crucible is even, molten steel injects feed trumpet earlier during cast, inject ingot mould from the bottom through the bottom running channel then, the number of ingot mould and position are determined according to actual needs and are arranged.
Vacuum should be controlled in 0.03Mpa to the 0.08Mpa scope the too high or too low quality that all can influence steel ingot of vacuum during the molten steel cast; Poring rate should be controlled in the 0.5m/s-0.8m/s scope.
The internal diameter of the internal diameter of feed trumpet, bottom running channel and ingot mould entrance point internal diameter three size are identical, the wall thickness of d2=d6=d5 feed trumpet also should be identical with the wall thickness of bottom running channel among Fig. 1, the internal diameter of feed trumpet should be controlled in the 3-5cm scope, the internal diameter of ingot mould and feed trumpet should be controlled in 3: 1 to 5: 1 scopes than d4: d2, running channel length L 3 scopes: d1+d2/2+d4/2+d3+ (2～3) cm.
Feed trumpet and running channel adopt magnesia refractories, and the ratio d1 of wall thickness and internal diameter: d2 should be controlled in 0.5: 1 to 1: 1 scope among Fig. 1; Ingot mould adopts cast iron materials, and wall thickness and internal diameter are controlled in 1: 4 to 1: 5 scope than d3: d4 among Fig. 1.
Feed trumpet and ingot mould aspect ratio L1 among Fig. 1: L2 should be controlled at (1.3-1.8): in 1 scope.
The present invention is by the vacuum in appropriate design casting mold and the control stove, realize that molten steel enters punching block by rising pouring, direction is certain because molten metal flows, and be mingled with consistent in the molten metal with gas and the mobile direction of molten metal, guaranteed the floating interval of floating dock that it is enough, help the eliminating of gas in the casting mold, suppress to annotate on the vacuum generation of turbulent flow and volume gas in the technology, having overcome to annotate on the vacuum to be mingled with in the technology does not have sufficient floating interval of floating dock with gas and remains in drawback in the ingot casting, and it is less to solidify the ingot casting shrinkage cavity, has improved lumber recovery.Adopt the vacuum of the present invention's design to make a bet nuclear power that technology produces is reduced to 80ppm by the 360ppm that annotates technology on the vacuum, lumber recovery raising 12% with the comprehensive impurity content of 316L wlding.
The invention has the advantages that: adopt the vacuum technology of making a bet to realize that molten metal injects the ingot mould process continually and steadily by feed trumpet and running channel from the bottom, the mobile direction of molten metal is certain, can guarantee to be mingled with in the molten metal consistent with gas and the mobile direction of molten metal, guaranteed the floating interval of floating dock that it is enough, help the eliminating of gas in the casting mold, suppress to annotate on the vacuum generation of turbulent flow and volume gas in the technology, having overcome to annotate on the vacuum to be mingled with in the technology does not have sufficient floating interval of floating dock with gas and remains in drawback in the ingot casting, and it is less to solidify the ingot casting shrinkage cavity, has improved the degree of purity and the lumber recovery of steel ingot.Although rising pouring technology extensively adopts in gravitational casting and other antivacuum smeltings, when adopting true the smelting, rising pouring technology does not have report as yet.
Description of drawings:
Fig. 1 is a casting mold structural representation of the present invention.
Reference numeral is: feed trumpet 1, bottom running channel 2, ingot mould 3
The specific embodiment:
Embodiment 1: adopt the vacuum technology of making a bet to prepare a 316L nuclear level wlding mother metal, the concrete size of watering injection molding: d1=5cm, d2=5cm, d3=3cm, d4=15cm, d5=d6=5cm, L1=40cm, L2=25cm, L3=25cm, poring rate 0.65m/s, vacuum 0.05Mpa, 1600 ℃ of pouring temperatures, feed trumpet and bottom running channel adopt magnesia fire-protecting wall to be built into, and ingot mould adopts cast iron quality.Final ingot casting does not have shrinkage cavity, smooth surface, the about 87ppm of comprehensive impurity content (bag oxide, sulfide, other nonmetal inclusions and gas etc.).
Embodiment 2: adopt the vacuum technology preparation 308 nuclear level wlding mother metals of making a bet, the concrete size of watering injection molding: d1=1.5cm, d2=3cm, d3=3cm, d4=15cm, d5=d6=3cm, L1=50cm, L2=30cm, L3=16cm, poring rate 0.7m/s, vacuum 0.08Mpa, 1620 ℃ of pouring temperatures, feed trumpet and bottom running channel adopt magnesia fire-protecting wall to be built into, and ingot mould adopts cast iron quality.Final ingot casting does not have shrinkage cavity, smooth surface, the about 90ppm of comprehensive impurity content (bag oxide, sulfide, other nonmetal inclusions and gas etc.).
Claims (5)
1. method for preparing high cleanliness nuclear-electric welding material mother metal is characterized in that: adopt conventional vacuum induction melting furnace, the technology of injecting ingot mould by the feed trumpet that waters injection molding from the bottom obtains ingot casting, and then carry out electroslag, forging and rolling, drawing finally obtains wlding; Watering injection molding is located in the vacuum chamber, constitute by three parts, comprise feed trumpet (1), bottom running channel (2) and ingot mould (3), after molten steel melting in crucible is even, molten steel injects feed trumpet earlier during cast, inject ingot mould from the bottom through the bottom running channel then, the number of ingot mould and position are determined according to actual needs and are arranged.
2. according to the described a kind of preparation high cleanliness nuclear-electric welding material mother metal method of claim 1, it is characterized in that: vacuum should be controlled in 0.03Mpa to the 0.08Mpa scope the too high or too low quality that all can influence steel ingot of vacuum during the molten steel cast; Poring rate should be controlled in the 0.5m/s-0.8m/s scope.
3. according to the described a kind of preparation high cleanliness nuclear-electric welding material mother metal method of claim 1, it is characterized in that: the internal diameter of the internal diameter of feed trumpet, bottom running channel and ingot mould entrance point internal diameter three size are identical, d2=d6=d5, the wall thickness of feed trumpet also should be identical with the wall thickness of running channel, the internal diameter of feed trumpet should be controlled in the 3-5cm scope, and the internal diameter of ingot mould and feed trumpet should be controlled in 3: 1 to 5: 1 scopes than d4: d2; Bottom running channel length L 3 scopes: d1+d2/2+d4/2+d3+ (2～3) cm.
4. according to the described a kind of preparation high cleanliness nuclear-electric welding material mother metal method of claim 1, it is characterized in that: feed trumpet and running channel adopt magnesia refractories, and the ratio d1 of wall thickness and internal diameter: d2 should be controlled in 0.5: 1 to 1: 1 scope; Ingot mould adopts cast iron materials, and wall thickness and internal diameter are controlled in 1: 4 to 1: 5 scope than d3: d4.
5. according to the described a kind of preparation high cleanliness nuclear-electric welding material mother metal method of claim 1, it is characterized in that: feed trumpet and ingot mould aspect ratio L1: L2 should be controlled at (1.3-1.8): in 1 scope.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101318403A CN101804535B (en) | 2010-03-25 | 2010-03-25 | Method for preparing parent metal of nuclear-electric welding material with ultrahigh purity |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101318403A CN101804535B (en) | 2010-03-25 | 2010-03-25 | Method for preparing parent metal of nuclear-electric welding material with ultrahigh purity |
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| CN101804535A true CN101804535A (en) | 2010-08-18 |
| CN101804535B CN101804535B (en) | 2011-10-19 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102248135A (en) * | 2011-06-20 | 2011-11-23 | 南阳汉冶特钢有限公司 | Liquid steel casting equipment |
| CN102451901A (en) * | 2010-10-25 | 2012-05-16 | 丹阳市精密合金厂有限公司 | Vacuum cast molding process and vacuum casting die assembly thereof |
| CN103878308A (en) * | 2014-03-03 | 2014-06-25 | 安徽华通铸业有限公司 | Novel casting technique capable of compacting castings |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02229646A (en) * | 1989-03-01 | 1990-09-12 | Hitachi Ltd | Pouring gate refractory for bottom pouring ingot-making |
| CN1076394A (en) * | 1993-01-08 | 1993-09-22 | 鞍山钢铁公司 | The process of producing steel ingot mould by blowing nitrogen to treat blast furnace molten iron |
| CN101003082A (en) * | 2007-01-19 | 2007-07-25 | 戴绍收 | Process for vacuum pressure casting copper parts |
| CN100577344C (en) * | 2006-12-29 | 2010-01-06 | 哈尔滨工业大学 | Active mesothermal copper base solder, and preparation method thereof |
-
2010
- 2010-03-25 CN CN2010101318403A patent/CN101804535B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02229646A (en) * | 1989-03-01 | 1990-09-12 | Hitachi Ltd | Pouring gate refractory for bottom pouring ingot-making |
| CN1076394A (en) * | 1993-01-08 | 1993-09-22 | 鞍山钢铁公司 | The process of producing steel ingot mould by blowing nitrogen to treat blast furnace molten iron |
| CN100577344C (en) * | 2006-12-29 | 2010-01-06 | 哈尔滨工业大学 | Active mesothermal copper base solder, and preparation method thereof |
| CN101003082A (en) * | 2007-01-19 | 2007-07-25 | 戴绍收 | Process for vacuum pressure casting copper parts |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102451901A (en) * | 2010-10-25 | 2012-05-16 | 丹阳市精密合金厂有限公司 | Vacuum cast molding process and vacuum casting die assembly thereof |
| CN102248135A (en) * | 2011-06-20 | 2011-11-23 | 南阳汉冶特钢有限公司 | Liquid steel casting equipment |
| CN102248135B (en) * | 2011-06-20 | 2012-11-21 | 郭秀梅 | Liquid steel casting equipment |
| CN103878308A (en) * | 2014-03-03 | 2014-06-25 | 安徽华通铸业有限公司 | Novel casting technique capable of compacting castings |
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| Publication number | Publication date |
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| CN101804535B (en) | 2011-10-19 |
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Address after: 076576 Zhuolu science and Technology Park, Zhangjiakou, Hebei, China Patentee after: HEBEI WUWEI AERO & POWER TECHNOLOGY CO.,LTD. Address before: 076576 Zhuolu science and Technology Park, Zhangjiakou, Hebei, China Patentee before: Hebei Wuwei Aero & Power Technology Co.,Ltd. |
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Denomination of invention: A method for preparing ultra-high purity nuclear power welding base materials Granted publication date: 20111019 Pledgee: Industrial and Commercial Bank of China Limited Zhuolu Branch Pledgor: HEBEI WUWEI AERO & POWER TECHNOLOGY CO.,LTD. Registration number: Y2024980015592 |