CN104328331A - Method for improving residual magnesium amount in nodular iron casting - Google Patents
Method for improving residual magnesium amount in nodular iron casting Download PDFInfo
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- CN104328331A CN104328331A CN201410705920.3A CN201410705920A CN104328331A CN 104328331 A CN104328331 A CN 104328331A CN 201410705920 A CN201410705920 A CN 201410705920A CN 104328331 A CN104328331 A CN 104328331A
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- wire
- magnesium
- cored
- silicon carbide
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Abstract
The invention relates to a method for improving residual magnesium amount in a nodular iron casting. According to the method, core-spun yarns containing silicon carbide are added into molten iron of nodular iron through feeding equipment. Silicon carbide is added into the core-spun yarns, and deoxidation, inoculation and long residual action of SiC are utilized, so that the oxygen content in the molten iron of nodular iron is effectively reduced, and consumption of magnesium is reduced, therefore, the residual magnesium amount in the nodular iron casting is improved.
Description
Technical field
The present invention relates to cast iron materials technical field, is a kind of method improving residual magnesium amount in nodular iron casting specifically.
Background technology
Spheroidal graphite cast iron obtains globular graphite by nodularization and inoculation, effectively improves the mechanical property of cast iron, in particular improve plasticity and toughness, thus obtain the intensity also higher than carbon steel.Spheroidal graphite cast iron is 20th century a kind of meehanite cast iron materials of growing up of the fifties, and its over-all properties, close to steel, just based on the performance of its excellence, has been successfully used to cast some stressed complexity, and intensity, toughness, wear resistance require higher part.Spheroidal graphite cast iron developed rapidly for be only second to graphitic cast iron, application cast iron materials very widely.So-called " with iron for steel ", mainly refers to spheroidal graphite cast iron.
Cored-wire wire-feeding technique is a kind of furnace outer refining technology risen in recent years, be widely used in hello the silk technology of modern steel-making and spheroidal graphite cast iron nodularization, steel inclusion morphology can be purified, improve molten steel castability, improve the use properties of steel, and the recovery rate of alloy can be significantly improved, fall low alloy-consumption, reduce steel-making cost, remarkable in economical benefits.At present, be used for carrying out the cored-wire that molten ductile iron adds magnesium process and have three classes: namely with the cored-wire of pure magnesium for core agent, with the cored-wire of MAGNESIUM METAL+ferrosilicon for core agent, and with the cored-wire that multiple elements design height magnesium alloy is core agent.With the widest be high Mg alloy cored wine, carrying out adding magnesium process with cored-wire, to have alloy recovery high, and result is stablized, and can remove smoke on advantages such as the impacts of operating environment.There are data to show, as long as the alloy magnesium content of cored-wire reaches 25%, just can surpass economically and traditional pour method.Even if but adopt high Mg alloy cored wine to produce magnesium iron, that also can only carry out molten ductile iron adds magnesium process, and cannot reduce the consumption of magnesium in molten ductile iron, and the problem that in nodular iron casting, residual magnesium amount is low fails to be well solved always.
Summary of the invention
In order to overcome the defect of above-mentioned prior art, technical problem to be solved by this invention is to provide a kind of method improving residual magnesium amount in nodular iron casting.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
Improve a method for residual magnesium amount in nodular iron casting, by wire-feeding device comprising straightening wire-leading device, the cored-wire including silicon carbide is added in molten ductile iron.
Beneficial effect of the present invention is: by adding silicon carbide in cored-wire, utilizes the deoxidation of SiC, inoculation(effect) and long-lasting, effectively reduces the oxygen level in molten ductile iron, decrease the consumption of magnesium, thus improve the residual magnesium amount of nodular iron casting.
Embodiment
By describing technology contents of the present invention in detail, being realized object and effect, be explained below in conjunction with embodiment.
The design of most critical of the present invention is: with can carburetting, increase silicon, the silicon carbide that can play again pre-inoculation(effect) to add in cored-wire and utilizes cored-wire wire-feeding technique to produce spheroidal graphite cast iron, utilize the deoxidation of SiC, inoculation(effect) and long-lasting, effectively reduce the oxygen level in molten ductile iron, decrease the consumption of magnesium, thus improve the residual magnesium amount of nodular iron casting.In addition, no matter temperature is low or high for SiC, the pregnant effect that all can reach.In iron liquid the dissolution phase of SiC be before Graphite Precipitation must through pilot process, for spheroidal graphite cast iron, silicon carbide breeds pre-treatment and then promotes to increase the number of graphite ball of cast iron, improves Oxygen potential, improves the roundness of graphite pebbles.
Concrete, SiC is as follows to solution 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, the SiO therefore formed
2overflow rapidly in this case, strengthen the dynamic conditions of reaction, the deoxidation process of this characteristic to molten ductile iron is helpful.
SiC carries out deoxygenation formula: Si+O
2=SiO
2, C+O
2=CO
2
[FeO] in iron liquid: 3 [FeO]+SiC=3 [Fe]+(SiO
2)+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 iron liquid, by following reaction formula melting in iron liquid:
Si and the Fe of SiC+Fe → FeSi+C (non-equilibrium graphite) in above formula in SiC combines, and remaining C is exactly non-equilibrium graphite, as the core of Graphite Precipitation.Non-equilibrium graphite makes C uneven distribution in iron liquid, and Local C element is too high, and microcell there will be " carbon peak ".The graphite of this new life has very high activity, and the mismatch of it and carbon is zero, and be therefore easy to absorb the carbon in iron liquid, pregnant effect is extremely superior.This shows that SiC is exactly a kind of so silica-based raw core agent.
2, inoculation(effect) and long-lasting
The SiO that SiC nucleating agent particle surface generates
2film intercepts (or delaying) carbon, element silicon diffusion process in liquation, prevents self concentration homogenize too fast, reduces graphite decline, is extremely beneficial to long-acting breeding.Do with SiC the graphite nuclei calculation that nucleating agent obtains more than FeSi, on the one hand, " carbon " has directly done core; On the other hand, rich Si microcell makes " carbon " supersaturation near it, with Graphite Precipitation.Core amounts many with by SiO
2film protect, and rich Si, rich C liquid " enclosure wall " block this three condition, be enough to make it become long-acting nucleating agent.
Based on above-mentioned action principle, the invention provides a kind of method improving residual magnesium amount in nodular iron casting, namely by wire-feeding device comprising straightening wire-leading device, the cored-wire including silicon carbide is added in molten ductile iron.
From foregoing description, beneficial effect of the present invention is: by adding silicon carbide in cored-wire, utilizes the deoxidation of SiC, inoculation(effect) and long-lasting, effectively reduces the oxygen level in molten ductile iron, decrease the consumption of magnesium, thus improve the residual magnesium amount of nodular iron casting.
Further, after described silicon carbide first mixes with high magnesium alloy, recharge and produce cored-wire in band steel.
Further, after described silicon carbide first mixes with metal magnesium granule, ferrosilicon, rare earth silicon and silico-calcium, recharge and produce cored-wire in band steel.
Further, the composition containing following weight part in described cored-wire: silicon carbide 1-10 part, magnesium 20-45 part, rare earth 0-10 part, calcium 2-10 part, other silicon 30-50 part except silicon carbide.
Further, the add-on of described cored-wire is 0.85% of molten ductile iron quality.
Embodiment 1
(1), after being mixed with high magnesium alloy by silicon carbide, be filled in band steel and produce cored-wire, the component content controlling cored-wire is: silicon carbide 1-10wt%, magnesium 20-45wt%, rare earth 0-10wt%, calcium 2-10wt%, other silicon 30-50wt% except silicon carbide;
(2) add in molten ductile iron by wire-feeding device comprising straightening wire-leading device by above-mentioned cored-wire, the add-on of cored-wire is 0.85% of molten ductile iron quality.
Embodiment 2
(1) after silicon carbide being mixed with metal magnesium granule, ferrosilicon, rare earth silicon and silico-calcium, be filled in band steel and produce cored-wire, the component content controlling cored-wire is: silicon carbide 1-10wt%, magnesium 20-45wt%, rare earth 0-10wt%, calcium 2-10wt%, other silicon 30-50wt% except silicon carbide;
(2) add in molten ductile iron by wire-feeding device comprising straightening wire-leading device by above-mentioned cored-wire, the add-on of cored-wire is 0.85% of molten ductile iron quality.
Comparative example
Add in molten ductile iron by wire-feeding device comprising straightening wire-leading device by general cored-wire, the add-on of cored-wire is 0.85% of molten ductile iron quality.
The experimental result of above-described embodiment 1-2 and the experimental result of comparative example are contrasted, result is as shown in table 1 below.
Table 1
| Base iron sulphur content | Final-sulphur content | Residual magnesium amount | Cored-wire add-on % | |
| Embodiment 1-2 | 0.016％ | 0.010％ | 0.043％ | 0.85％ |
| Comparative example | 0.015％ | 0.011％ | 0.038％ | 0.85％ |
Shown in above-mentioned table 1, the present invention by adding silicon carbide in cored-wire, utilizes the deoxidation of SiC, inoculation(effect) and long-lasting, effectively reduces the oxygen level in molten ductile iron, decrease the consumption of magnesium, thus improve the residual magnesium amount of nodular iron casting.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every equivalents utilizing description of the present invention to do, or be directly or indirectly used in relevant technical field, be all in like manner included in scope of patent protection of the present invention.
Claims (5)
1. improve a method for residual magnesium amount in nodular iron casting, it is characterized in that: by wire-feeding device comprising straightening wire-leading device, the cored-wire including silicon carbide is added in molten ductile iron.
2. remain the method for magnesium amount in raising nodular iron casting according to claim 1, it is characterized in that: after described silicon carbide first mixes with high magnesium alloy, recharge and produce cored-wire in band steel.
3. remain the method for magnesium amount in raising nodular iron casting according to claim 1, it is characterized in that: after described silicon carbide first mixes with metal magnesium granule, ferrosilicon, rare earth silicon and silico-calcium, recharge and produce cored-wire in band steel.
4. in raising nodular iron casting according to claim 1, remain the method for magnesium amount, it is characterized in that: the composition containing following weight part in described cored-wire: silicon carbide 1-10 part, magnesium 20-45 part, rare earth 0-10 part, calcium 2-10 part, other silicon 30-50 part except silicon carbide.
5. remain the method for magnesium amount in raising nodular iron casting according to claim 1, it is characterized in that: the add-on of described cored-wire is 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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| CN104328331B CN104328331B (en) | 2017-01-04 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| TWI647205B (en) * | 2017-03-01 | 2019-01-11 | 日商石川硅石工業股份有限公司 | Control material and manufacturing method of control material |
| 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19916235A1 (en) * | 1999-03-01 | 2000-09-07 | Odermath Stahlwerkstechnik | Filled wire for treating melts, especially of cast iron to obtain a spheroidal graphite structure, comprises a metal sheathed magnesium or deformable magnesium alloy core wire |
| CN1465733A (en) * | 2002-06-29 | 2004-01-07 | 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 |
-
2014
- 2014-11-28 CN CN201410705920.3A patent/CN104328331B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19916235A1 (en) * | 1999-03-01 | 2000-09-07 | Odermath Stahlwerkstechnik | Filled wire for treating melts, especially of cast iron to obtain a spheroidal graphite structure, comprises a metal sheathed magnesium or deformable magnesium alloy core wire |
| CN1465733A (en) * | 2002-06-29 | 2004-01-07 | 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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| TWI647205B (en) * | 2017-03-01 | 2019-01-11 | 日商石川硅石工業股份有限公司 | Control material and manufacturing method of control material |
| 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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| Publication number | Publication date |
|---|---|
| CN104328331B (en) | 2017-01-04 |
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