CN1255568C - Process for making core agent and core yarn of high magnesium alloy core-spun yarn - Google Patents
Process for making core agent and core yarn of high magnesium alloy core-spun yarn Download PDFInfo
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- CN1255568C CN1255568C CN 02140811 CN02140811A CN1255568C CN 1255568 C CN1255568 C CN 1255568C CN 02140811 CN02140811 CN 02140811 CN 02140811 A CN02140811 A CN 02140811A CN 1255568 C CN1255568 C CN 1255568C
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Abstract
The present invention relates to a technology for making a core agent and a core wire of a core coating wire of high magnesium alloy. The present invention is mainly characterized in that the core agent of the core coating wire of high magnesium alloy and the core coating wire comprise magnesium, calcium, rare earth and silicon. The present invention uses a melting mixing method or a magnesium pressing method and utilizes a covering agent and protective gas to smelt, cast and press ingots in an induction furnace or other heating furnace bodies. A closed graded crushing technologic method is carried out under the protection of gas to obtain the core agent of the core coating wire of high magnesium alloy with high purity, high uniformity and excellent particle grade.
Description
Technical field
The present invention relates to a kind of manufacture craft of core agent of high Mg alloy cored wine, concrete is the smelting that is applied to molten iron spheroidizing cored-wire core agent alloy, broken production technique and relevant broken alloy claded wire product.
Background technology
Adopting cored wire technology to carry out the processing of molten steel, molten iron, is the adding technology that plays emerging a kind of alloying element the eighties.Its advantage be can will add in smelting furnace or steel (iron) water bag in scaling loss greatly, the unsettled alloy of yield directly inserts and wraps at the end, can increase substantially the stability and the accuracy of its recovery rate and final molten metal composition.
The magnesium-rich pellet cored-wire is mainly used in the spheroidizing and the desulfurization of molten iron and handles.Its major advantage is: it is low that the processing cost ratio pours method; The quality product ratio pours method height (at least with pour method suitable); Operating environment is better than pouring method; It is light that the labor strength ratio pours method; It is easy to realize that mechanize and automatization ratio pour method.
Now external use has two kinds: a kind of is that high magnesium mixes system type nodularization cored-wire, i.e. core agent mixes system by ratios on request such as pure magnesium grain, ferrosilicon powder, silicon calcium powders, wraps up with thin steel band forming again.Its magnesium content is: magnesium:＞15-≤40%; Another kind is high magnesium alloy nodularization cored-wire, promptly by after founding the magnesium that becomes to meet the composition requirement, silicon, calcium, rare earth alloy fragmentation, packs and forms.At present, external high ingredient (containing magnesium) can only be accomplished 25-28%.Domestic present use also mainly be that this is a kind of.
In molten iron, the vapour pressure of pure magnesium is more much bigger than the vapour pressure of alloys magnesium (Si-Mg phase).Under the situation of identical Mg content, the fierce degree of pure magnesium cored-wire reaction is more much bigger than alloys magnesium, and the recovery rate of its nodularization element is just much smaller.Because of the ratio of steel band in the cored-wire accounts for 34-40%, and the dominant element of magnesium to be balling-up turn into usefulness, so under the condition of the cored-wire of same diameter, the unit ball of molten iron changes into this to be reduced along with the increase of magnesium amount in the agent of cored-wire core.High Mg alloy cored wine (Mg:30-40%) is exactly to solve this limiting element, and it is originally lower that molten steel quality raising, unit ball are changed into.
With pour the method nodulizing agent relatively, when Mg content changed in the 20-45% scope in the cored-wire, the nodularization cost can be reduced to 85 yuan/ton by 120 yuan/ton.
Become under one the prerequisite keeping 85 yuan of/ton nodularizations, pour the price of method nodulizing agent and need reduce to 5700 yuan/ton, could maintain an equal level.And this be present traditional nodulizing agent cost can not accomplish.The huge advantage of high magnesium alloy nodularization cored-wire on the nodularization cost that Here it is.
Summary of the invention
What the objective of the invention is to provide at the deficiencies in the prior art part a kind ofly solves the manufacturability issues that high magnesium alloy is smelted, and a kind of high magnesium (magnesium: the 30-70%) manufacture craft of the core agent of alloy claded wire of founding type is provided.
The objective of the invention is to take following measure to realize:
1) the composition scope of the core agent of high Mg alloy cored wine is:
Magnesium: 30-70%, calcium: 0-8%, rare earth: 0-8%, silicon 30-45%;
2) processing method of the high Mg alloy cored wine core of making agent is:
Adopt mix-melting method or press that the magnesium method utilizes in induction furnace or other heating furnace body that insulating covering agent and shielding gas are smelted, casting, briquetting, and the processing method of the graded crushing of under the protection of shielding gas, sealing, wherein:
Mix-melting method:
The alloy raw material that will prepare by charger sheet, (rebasing ferrosilicon, magnesium ingot, rare earth ferrosilicon, ferrosilicon, silico-calcium etc.) join in the induction furnace in order, and add insulating covering agent and melt, when having treated that the metal bath occurs, reduce power, add insulating covering agent, make magnesium and silicon have adequate time to form Mg
2Si or silicon magnesium eutectic thing, and reduce the induction furnace frequency in mid-term and improve stirring capacity in the stove, when coming out of the stove, metal liquid stream is protected with shielding gas, it is not contacted with air, cast finishes to drop back and removes protective guard, be sprinkled into insulating covering agent on the alloy pig surface, and carry out briquetting with platen, and make its quick cooling, avoid the composition segregation;
Press the magnesium method:
To come from iron, silicon, calcium, the rare earth quad alloy liquid of the hot stove in ore deposit or low magnesium (about 4%) iron, silicon, calcium, rare earth, the liquid magnesium alloy for preparing by induction furnace; under high silicon phase, carry out pressure of magnesium adding; method is with isolated plant; the metal magnesium ingot is pressed into bottommost from alloy liquid surface makes it carry out the alloying of magnesium, silicon; all magnesium ingots divide and are pressed into for 3-4 time; to add insulating covering agent at every turn after being pressed into and feed shielding gas protection; and kept constant temperature 3-20 minute; after all having pressed, the subsequent operations of equally coming out of the stove with mix-melting method.
Insulating covering agent is anhydrous carnallite (MgCl
2+ KCl), the mixture of barium fluxing agent, NaCl or wherein a kind of.No. two solvent is meant Repone K, bariumchloride, magnesium chloride.The shielding gas that adopts is argon gas, nitrogen or the mixed gas of the two.
Smelt high magnesium (30-45%) with existing traditional induction furnace smelting technology, the scaling loss of magnesium will be up to more than 35%, have a large amount of simple substance magnesium to exist in the alloy, and composition is stable very poor, and the fragmentation of alloy can't be carried out suitability for industrialized production because of catching fire.
Adopt induction furnace (or other adds hot melting furnace), under the protection of insulating covering agent or shielding gas, smelt, cast, suppress thin ingot to press magnesium method or mix-melting method.And the graded crushing of under the shielding gas protection, sealing, thereby obtain high cleanliness, high uniformity, the superior high Mg alloy cored wine core agent of grade distribution.
Effect of the present invention is:
1, the founding of high magnesium alloy (Mg:30-70%), fragmentation are become and a kind ofly can be fit to the viable process of suitability for industrialized production in batches;
2, the scaling loss of magnesium is reduced to below 10% in the smelting process, and oxidation is reduced to below 5%;
3, the problems such as burning porosity serious, alloy pig is big in simple substance magnesium height, the process of cooling in the process, alloy oxidation is serious of founding of high magnesium alloy (Mg:30-70%) have been solved;
4, solved the combustion problem of high magnesium alloy fragmentation.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
Be described further below in conjunction with the enforcement of accompanying drawing technical process of the present invention:
Insulating covering agent: anhydrous carnallite (MgCl
2+ KCl), the mixture of barium fluxing agent, NaCl or wherein a kind of.Shielding gas is: argon gas, nitrogen or the mixed gas of the two.
Shredder assembly: will be installed in the single purpose building by the grading automatical broken unit that the chapelet of 3-4 platform palate crusher and 1-2 roll crusher is formed, when broken state, charge into shielding gas, and carry out sound insulation, dust-separation, minimizing gas with this and scatter and disappear.
Process explanation:
Mix-melting method:
The alloy raw material that will prepare by charger sheet; (rebasing ferrosilicon, magnesium ingot, rare earth ferrosilicon, ferrosilicon, silico-calcium etc.) join in the induction furnace in order; and the adding insulating covering agent melts; when having treated that the metal bath occurs, reduce power, add insulating covering agent, and add a cover special-purpose bell; feed shielding gas simultaneously; furnace temperature stably is controlled at 1100-1200 ℃, constant temperature 15-20 minute, makes magnesium and silicon have adequate time to form Mg
2Si or silicon magnesium eutectic thing, and reduce the induction furnace frequency in mid-term and improve stirring capacity in the stove, when coming out of the stove, metal liquid stream is protected with shielding gas, it is not contacted with air, cast finishes to drop back and removes protective guard, be sprinkled into insulating covering agent on the alloy pig surface, and carry out briquetting with platen, and make its quick cooling, avoid the composition segregation;
Press the magnesium method:
To come from the Fe-Si-Ca-RE quad alloy liquid of the hot stove in ore deposit or low magnesium (about 4%) the Fe-Si-Ca-RE-Mg alloy liquid for preparing by induction furnace, under high silicon phase, carry out pressure of magnesium adding.Method is: with isolated plant; the metal magnesium ingot is pressed into bottommost from alloy liquid surface makes it carry out the alloying of magnesium, silicon; all magnesium ingots divide and are pressed into for 3-4 time; to add insulating covering agent at every turn after being pressed into and feed shielding gas protection; and kept constant temperature 3-20 minute; after all having pressed, the subsequent operations of equally coming out of the stove with mix-melting method.
Embodiment:
1, mix-melting method:
Smelt magnesium 40 core agent, concrete composition is Mg40Si40RE2Ca2.Raw materials used is ferrosilicon, the silico-calcium that contains 31%Ca and 55%Si, the norium that contains 100%RE that contains 76%Si, the Pure Silicon Metal that contains 99%Si.
Earlier with little metal silicon (＞8mm) add furnace bottom, add magnesium ingot then, add Pure Silicon Metal, ferrosilicon, norium etc. more successively, and sneak into a small amount of insulating covering agent and add.Be warming up to and begin to occur the molten bath, the adding insulating covering agent.Adopt special-purpose bell to seal, and feed shielding gas, constant temperature is smelted 15-20 minute to all melting clear and being incubated 20 minutes.Remove bell, add insulating covering agent and be cooled to 1100 ℃.The cast of coming out of the stove, the promoting the circulation of qi body of going forward side by side protection.
The sampling composition of high magnesium core agent is: Mg42.4%, Ca2.2%, RE2.1%, Si40.8%, Mg01.8%.
The scaling loss of magnesium is: below 10%.
Being oxidized to of magnesium: 3.8%.
2, induction furnace pressure magnesium method:
Raw material mix is the same.Earlier with little metal silicon (＞8mm) add furnace bottom, add the 3-4kg magnesium ingot then, add Pure Silicon Metal, ferrosilicon, norium etc. more successively, and sneak into a small amount of insulating covering agent and add.Be warming up to and all melt clearly, add insulating covering agent and also be cooled to 1200 ℃.
Adopt pressure of magnesium adding equipment, the circular platform type magnesium ingot is pressed into alloy liquid bottom, kept 1 minute, make its abundant alloying, row is pressed magnesium for the second time again, and whole process need be finished for 3-4 time.Press in the magnesium process do not bother to see me out electricity or keep lowest power of induction furnace.
Carried out constant temperature 20 minutes at 1100 ℃ then, and adopt the bell sealing, and feed protective gas, make the abundant alloying of silicon and magnesium.And come out of the stove with same method and burn to annotate.
Mg43.2、Ca：2.1％、RE：1.9％、Si：41.2％、MgO：0.8％。
The scaling loss of magnesium is: about 7%.
Being oxidized to of magnesium: below 2.0%.
Mg40 nodularization cored-wire application example:
Application conditions:
Hot metal ladle: 3 tons, the iron water amount of packing into: 2.94 tons.
Base iron composition %:C:3.7, Si:1.3, Mn:0.13, P:0.04, S:0.026
Treatment temp: 1490 ℃
Cored-wire core agent composition: Mg:41%RE:3%Ca:2%Si:38%
Mg40 nodularization cored-wire parameter:
Cored-wire substance: 340g/m
Steel band substance: 140g/m
Core agent substance: 200-210g/m
Processing parameter
Wire-feeding velocity: 54m/min
Feeding length: 38m (13m/ ton molten iron)
The line feeding time: 42s
Add ferrosilicon amount: 15Kg in the bag
The nodularization result:
Magnesium iron composition %:
C：3.75，Si：2.6，Mn：0.15，P：0.04，S：0.015，Mg：0.039
Magnesium iron as-cast characteristic: tensile strength: 475N/mm
2, unit elongation: 23%
Nodulizing grade: the 1-2 level,
Nodulizing grade: the 6-7 level,
Nodularization cost: 87 yuan of/ton molten iron
Advantage of the present invention is: (magnesium: founding 30-70%), fragmentation become a kind ofly can be fit to mass industry to high magnesium alloy Produce, thereby obtain high cleanliness, high uniformity, the superior high Mg alloy cored wine core agent of grade distribution.
Claims (3)
1, a kind of manufacture craft of core agent of high Mg alloy cored wine is characterized in that:
1) the composition scope of the core agent of high Mg alloy cored wine is:
Magnesium: 30-70%, calcium: 0-8%, rare earth: 0-8%, silicon 30-45%;
2) processing method of the high Mg alloy cored wine core of making agent is:
Adopt mix-melting method or press that the magnesium method utilizes in induction furnace or other heating furnace body that insulating covering agent and shielding gas are smelted, casting, briquetting, and the processing method of the graded crushing of under the protection of shielding gas, sealing, wherein:
Mix-melting method:
The alloy raw material that will prepare by charger sheet; be sequentially added in the induction furnace; and the adding insulating covering agent melts; when having treated that the metal bath occurs, reduce power, add insulating covering agent, and add a cover special-purpose bell; feed shielding gas simultaneously; furnace temperature stably is controlled at 1100-1200 ℃, constant temperature 15-20 minute, makes magnesium and silicon have adequate time to form Mg
2Si or silicon magnesium eutectic thing, and reduce the induction furnace frequency in mid-term and improve stirring capacity in the stove, when coming out of the stove, metal liquid stream is protected with shielding gas, it is not contacted with air, cast finishes to drop back and removes protective guard, be sprinkled into insulating covering agent on the alloy pig surface, and carry out briquetting with platen, and make its quick cooling, avoid the composition segregation;
Press the magnesium method:
To come from iron, silicon, calcium, the rare earth quad alloy liquid of the hot stove in ore deposit or low magnesium iron, silicon, calcium, rare earth, the liquid magnesium alloy for preparing by induction furnace; under high silicon phase, carry out pressure of magnesium adding; method is with isolated plant; the metal magnesium ingot is pressed into bottommost from alloy liquid surface makes it carry out the alloying of magnesium, silicon; all magnesium ingots divide and are pressed into for 3-4 time; to add insulating covering agent at every turn after being pressed into and feed shielding gas protection; and kept constant temperature 3-20 minute; after all having pressed, the subsequent operations of equally coming out of the stove with mix-melting method.
2, the manufacture craft of the core agent of high Mg alloy cored wine according to claim 1 is characterized in that: insulating covering agent is the mixture of anhydrous carnallite, barium fluxing agent, NaCl or wherein a kind of.
3, the manufacture craft of the core agent of high Mg alloy cored wine according to claim 1 is characterized in that: the shielding gas of employing is argon gas, nitrogen or the mixed gas of the two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02140811 CN1255568C (en) | 2002-06-29 | 2002-06-29 | Process for making core agent and core yarn of high magnesium alloy core-spun yarn |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02140811 CN1255568C (en) | 2002-06-29 | 2002-06-29 | Process for making core agent and core yarn of high magnesium alloy core-spun yarn |
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| CN1465733A CN1465733A (en) | 2004-01-07 |
| CN1255568C true CN1255568C (en) | 2006-05-10 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102344989B (en) * | 2010-08-06 | 2013-05-29 | 辽宁亚泰新型建材科技有限公司 | Pretreatment method of molten iron for desulfurization by wire feeding method |
| CN102399944A (en) * | 2011-12-29 | 2012-04-04 | 天津市万路科技有限公司 | Desulfurization treatment method for molten iron |
| CN102690963B (en) * | 2012-05-16 | 2014-12-10 | 北京有色金属研究总院 | Flux used for recycling magnesium alloy cuttings, and preparation method and application method thereof |
| CN104328331B (en) * | 2014-11-28 | 2017-01-04 | 三祥新材股份有限公司 | A kind of improve the method remaining magnesium amount in nodular iron casting |
| CN106086303A (en) * | 2016-07-28 | 2016-11-09 | 上海大学 | Magnesium calcium alloy core-spun yarn of Ferrous Metallurgy and preparation method thereof |
| CN106086302A (en) * | 2016-07-28 | 2016-11-09 | 上海大学 | Magnesium calcium rare earth alloy core-spun yarn of Ferrous Metallurgy and preparation method thereof |
| CN106399636A (en) * | 2016-11-18 | 2017-02-15 | 浙江宝信新型炉料科技发展有限公司 | High-magnesium rare earth magnesium alloy core-spun yarn and preparation method thereof |
| CN109777915A (en) * | 2017-11-14 | 2019-05-21 | 上海永烨冶金科技发展有限公司 | A kind of magnesium calcium alloy core-spun yarn and preparation method thereof |
| CN114438274B (en) * | 2022-02-21 | 2023-04-28 | 内蒙古圣泉科利源新材料科技有限公司 | Production method of special high-silicon nodulizer for large castings |
| CN115094255B (en) * | 2022-06-15 | 2023-08-25 | 安徽飞翔新材料科技有限公司 | Preparation method of non-vacuum copper-magnesium alloy large slab ingot |
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