CN104328331B - A kind of improve the method remaining magnesium amount in nodular iron casting - Google Patents
A kind of improve the method remaining magnesium amount in nodular iron casting Download PDFInfo
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- CN104328331B CN104328331B CN201410705920.3A CN201410705920A CN104328331B CN 104328331 B CN104328331 B CN 104328331B CN 201410705920 A CN201410705920 A CN 201410705920A CN 104328331 B CN104328331 B CN 104328331B
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Abstract
The present invention relates to a kind of method improving and remaining magnesium amount in nodular iron casting, by wire-feeding device comprising straightening wire-leading device, the core-spun yarn including carborundum is added in molten ductile iron.The present invention, by adding carborundum in core-spun yarn, utilizes the deoxidation of SiC, inoculation(effect) and long-lasting, effectively reduces the oxygen content in molten ductile iron, decrease the consumption of magnesium, thus improve the residual magnesium amount of nodular iron casting.
Description
Technical field
The present invention relates to cast iron materials technical field, during specifically one improves nodular iron casting, remain magnesium amount
Method.
Background technology
Spheroidal graphite cast-iron is to obtain globular graphite by nodularization and inoculation, is effectively improved the machinery of cast iron
Performance, in particular improves plasticity and toughness, thus obtains the intensity higher than carbon steel.Spheroidal graphite cast-iron is 20
Century a kind of high-strength cast iron material of growing up of the fifties, its combination property close to steel, base just
In the performance of its excellence, it is successfully used to cast some stress complicated, intensity, toughness, wearability requirement
Higher part.Spheroidal graphite cast-iron developed rapidly for be only second to casting pig, apply quite varied cast iron material
Material.So-called " with ferrum for steel ", refers mainly to spheroidal graphite cast-iron.
Core-spun yarn wire-feeding technique is a kind of furnace outer refining technology risen in recent years, is widely used in modern refining
In hello the silk technology of steel and spheroidal graphite cast-iron nodularization, steel inclusion morphology can be purified, improve molten steel castability, change
The serviceability of kind steel, and the recovery rate of alloy can be significantly improved, drop low alloy-consumption, reduce steel-making cost,
Remarkable in economical benefits.At present, the core-spun yarn adding magnesium process for carrying out molten ductile iron has three classes: i.e. with pure
Magnesium is the core-spun yarn of core agent, the core-spun yarn being core agent with magnesium metal+ferrosilicon, and with multiple elements design height magnesium alloy
Core-spun yarn for core agent.With the widest be high Mg alloy cored wine, carry out adding magnesium with core-spun yarn and process and have
Alloy recovery is high, and result is stable, and can remove smoke the advantages such as the impact on working environment.There is number
According to showing, as long as the alloy magnesium content of core-spun yarn reaches 25%, so that it may surpass economically and traditional pour method.
Even if but using high Mg alloy cored wine to produce magnesium iron, the magnesium that adds that also can only carry out molten ductile iron processes, and
Cannot reduce the consumption of magnesium in molten ductile iron, the problem remaining magnesium amount low in nodular iron casting fails to obtain always
Well solve.
Summary of the invention
In order to overcome the defect of above-mentioned prior art, the technical problem to be solved is to provide one and carries
The method remaining magnesium amount in high nodular iron casting.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is:
A kind of improve the method remaining magnesium amount in nodular iron casting, carborundum will be included by wire-feeding device comprising straightening wire-leading device
Core-spun yarn adds in molten ductile iron.
The beneficial effects of the present invention is: by core-spun yarn add carborundum, utilize SiC deoxidation,
Inoculation(effect) and long-lasting, effectively reduces the oxygen content in molten ductile iron, decreases the consumption of magnesium, from
And improve the residual magnesium amount of nodular iron casting.
Detailed description of the invention
By describing the technology contents of the present invention in detail, being realized purpose and effect, give below in conjunction with embodiment
With explanation.
The design of most critical of the present invention is: with can carburetting, increase silicon, the carbonization of pre-inoculation(effect) can be played again
Silicon add in core-spun yarn and utilize core-spun yarn wire-feeding technique produce spheroidal graphite cast-iron, utilize SiC deoxidation,
Inoculation(effect) and long-lasting, effectively reduces the oxygen content in molten ductile iron, decreases the consumption of magnesium, from
And improve the residual magnesium amount of nodular iron casting.Additionally, SiC no matter temperature is low or high, all can reach is pregnant
Educate effect.Before in ferrum liquid, the dissolution phase of SiC is Graphite Precipitation must through pilot process, for spheroidal graphite cast
Ferrum, carborundum breeds pretreatment and then promotes to increase the number of graphite ball of cast iron, improves Oxygen potential, improve graphite nodule
Roundness.
Concrete, SiC is as follows to solving technical solution of the present invention role principle:
1, deoxidation: SiC reacts to each other with the oxygen in melt cinder phase or liquid metal, discharges a large amount of combustion heat,
Therefore the SiO formed2Escape the most rapidly, strengthen the dynamic conditions of reaction, this characteristic
Deoxidation process to molten ductile iron is helpful.
SiC carries out deoxygenation formula: Si+O2=SiO2, C+O2=CO2
[FeO] in ferrum liquid: 3 [FeO]+SiC=3 [Fe]+(SiO2)+CO+Q (heat)
For [FeO] in slag: (FeO+SiC=[Fe]+[Si]+CO+Q (heat)
The fusing point of SiC is 2700 DEG C, non-fusible in ferrum liquid, by following reaction equation melting in ferrum liquid:
SiC+Fe → FeSi+C (non-equilibrium graphite) Si with Fe in SiC in above formula is combined, remaining C
It is exactly non-equilibrium graphite, as the core of Graphite Precipitation.Non-equilibrium graphite makes C uneven distribution in ferrum liquid,
Local C element is too high, and microcell there will be " carbon peak ".The graphite of this new life has the highest activity, it and carbon
Mismatch be zero, be therefore easy to absorb the carbon in ferrum liquid, pregnant effect is the most superior.Thus can see
Going out SiC is exactly the silica-based raw core agent of such a.
2, inoculation(effect) and long-lasting
The SiO that SiC inovulant particle surface generates2Film intercepts (or delaying) carbon, element silicon in liquation
Diffusion process, prevent self concentration too fast from homogenizing, reduce graphite decline, be very beneficial to long-acting breeding.With
The graphite nuclei calculation that SiC does obtained by inovulant is more than FeSi, on the one hand, " carbon " has directly done core；
On the other hand, rich Si microcell makes its neighbouring " carbon " supersaturation, with Graphite Precipitation.Core amounts many be subject to
SiO2Film is protected, and the liquid " enclosure wall " of rich Si, rich C blocks this three condition, it is sufficient to make it become long
Effect inovulant.
Based on above-mentioned action principle, the invention provides a kind of method improving and remaining magnesium amount in nodular iron casting,
I.e. by wire-feeding device comprising straightening wire-leading device, the core-spun yarn including carborundum is added in molten ductile iron.
Knowable to foregoing description, the beneficial effects of the present invention is: by adding carborundum in core-spun yarn,
Utilize the deoxidation of SiC, inoculation(effect) and long-lasting, effectively reduce the oxygen content in molten ductile iron,
Decrease the consumption of magnesium, thus improve the residual magnesium amount of nodular iron casting.
Further, after described carborundum first mixes with high magnesium alloy, refill in strip steel, produce cored
Line.
Further, after described carborundum first mixes with magnesium metal grain, ferrosilicon, rare earth silicon and silico-calcium, then fill out
Fill in strip steel, produce core-spun yarn.
Further, containing the composition of following weight portion in described core-spun yarn: carborundum 1-10 part, magnesium 20-45
Part, rare earth 0-10 part, calcium 2-10 part, other silicon 30-50 part outside de-carbon SiClx.
Further, the addition of described core-spun yarn is the 0.85% of molten ductile iron quality.
Embodiment 1
(1) after carborundum being mixed with high magnesium alloy, it is filled in strip steel and produces core-spun yarn, control cored
The component content of line is: carborundum 1-10wt%, magnesium 20-45wt%, rare earth 0-10wt%, calcium 2-10wt%,
Other silicon 30-50wt% outside de-carbon SiClx；
(2) adding in molten ductile iron by wire-feeding device comprising straightening wire-leading device by above-mentioned core-spun yarn, the addition of core-spun yarn is ball
The 0.85% of ferrum molten steel quality.
Embodiment 2
(1), after being mixed with magnesium metal grain, ferrosilicon, rare earth silicon and silico-calcium by carborundum, system it is filled in strip steel
Producing core-spun yarn, the component content controlling core-spun yarn is: carborundum 1-10wt%, magnesium 20-45wt%, rare earth
0-10wt%, calcium 2-10wt%, other silicon 30-50wt% outside de-carbon SiClx；
(2) adding in molten ductile iron by wire-feeding device comprising straightening wire-leading device by above-mentioned core-spun yarn, the addition of core-spun yarn is ball
The 0.85% of ferrum molten steel quality.
Comparative example
Adding in molten ductile iron by wire-feeding device comprising straightening wire-leading device by general core-spun yarn, the addition of core-spun yarn is ductile iron
The 0.85% of water quality.
The experimental result of above-described embodiment 1-2 is contrasted with the experimental result of comparative example, result such as table 1 below
Shown in.
Table 1
| Base iron sulfur content | Final-sulphur content | Residual magnesium amount | Core-spun yarn addition % | |
| Embodiment 1-2 | 0.016% | 0.010% | 0.043% | 0.85% |
| Comparative example | 0.015% | 0.011% | 0.038% | 0.85% |
Knowable to shown in above-mentioned table 1, the present invention, by adding carborundum in core-spun yarn, utilizes taking off of SiC
Oxygen, inoculation(effect) and long-lasting, effectively reduce the oxygen content in molten ductile iron, decrease disappearing of magnesium
Consumption, thus improve the residual magnesium amount of nodular iron casting.
The foregoing is only embodiments of the invention, not thereby limit the scope of the claims of the present invention, every profit
The equivalents made by description of the invention content, or directly or indirectly it is used in relevant technical field,
The most in like manner it is included in the scope of patent protection of the present invention.
Claims (1)
1. one kind is improved the method remaining magnesium amount in nodular iron casting, it is characterised in that: will by wire-feeding device comprising straightening wire-leading device
The core-spun yarn including carborundum adds in molten ductile iron；
The composition of described core-spun yarn is: carborundum 1 10 weight portion, magnesium 20 45 weight portion, rare earth 0 10 weight
Amount part, calcium 2 10 weight portion, other silicon 30 50 weight portions outside de-carbon SiClx；
The addition of described core-spun yarn is the 0.85% of molten ductile iron quality.
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| CN201410705920.3A CN104328331B (en) | 2014-11-28 | 2014-11-28 | A kind of improve the method remaining magnesium amount in nodular iron casting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106086306A (en) * | 2016-08-19 | 2016-11-09 | 三祥新材股份有限公司 | A kind of high magnesium core-spun yarn and preparation method thereof |
| JP6235178B1 (en) * | 2017-03-01 | 2017-11-22 | 石川ライト工業株式会社 | Control material and control material manufacturing method |
| CN109576432A (en) * | 2018-11-11 | 2019-04-05 | 三祥新材（宁夏）有限公司 | A kind of novel spheroidized core wire and preparation method |
| CN115612782A (en) * | 2022-10-27 | 2023-01-17 | 禹州市恒利来新材料股份有限公司 | Carbon composite cored wire |
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| DE19916235C2 (en) * | 1999-03-01 | 2001-03-08 | Odermath Stahlwerkstechnik | Cored wire for the treatment of melts by wire injection |
| CN1255568C (en) * | 2002-06-29 | 2006-05-10 | 包头文鑫实业有限公司 | Process for making core agent and core yarn of high magnesium alloy core-spun yarn |
| CN1580307A (en) * | 2003-08-05 | 2005-02-16 | 包头文鑫实业有限公司 | Process for manufacturing high silicon-magnesium-ratio alloy spheroidized core-spun yarn |
| CN2883391Y (en) * | 2006-01-26 | 2007-03-28 | 包头翌新冶金技术有限公司 | Mg cored wire |
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