CN106399811B - Molybdenum-iron spreads melting method and its application - Google Patents
Molybdenum-iron spreads melting method and its application Download PDFInfo
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- CN106399811B CN106399811B CN201610884240.1A CN201610884240A CN106399811B CN 106399811 B CN106399811 B CN 106399811B CN 201610884240 A CN201610884240 A CN 201610884240A CN 106399811 B CN106399811 B CN 106399811B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
- C21C1/105—Nodularising additive agents
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention provides a kind of molybdenum-irons to spread melting method, comprises the following steps：(1) molybdenum-iron is crushed to 3~10mm, then at 500~600 DEG C, is calcined, obtain pretreated molybdenum-iron；(2) in the built-in bag of casting ladle pit, nodulizer, inovulant and pretreated molybdenum-iron, the pretreated molybdenum-iron are successively added in successively and is covered in surface；(3) carry out pouring method spheroidising with 1400~1450 DEG C of molten iron, poured into a mould after taking off filter, be carried out at the same time secondary current-following inoculation.The present invention, which passes through molybdenum-iron, to be pre-processed, and is directly added in solid form, is made dystectic ferro-molybdenum that can be diffused melting at 1400 DEG C, has the advantages that smelting temperature is low in stove, and can be completed in 1min, and is spread uniform.Meanwhile without molybdenum-iron is melted jointly with molten iron, it can be scrapped to avoid the isolation of remaining molten iron in stove, save raw material.
Description
Technical field
The present invention relates to Cast Iron Melting Technique field more particularly to a kind of molybdenum-iron diffusion melting method and its applications.
Background technology
Molybdenum-iron is the ferroalloy of molybdenum and iron composition, generally containing molybdenum 50~60%, the alloy addition as steel-making.Add in steel
Entering molybdenum can make steel have uniform fine grained texture, and improve the quenching degree of steel, be conducive to eliminate temper brittleness.In high-speed steel,
Molybdenum can replace a part of tungsten.Molybdenum is combined together with other alloying elements is widely used in production stainless steel, heat resisting steel, acidproof
Steel and tool steel and the alloy with specific physical performance.Molybdenum, which is added in cast iron, can increase its intensity and wearability.
Wherein, silicon molybdenum nodular cast iron have higher intensity, good plasticity and stronger anti-oxidant, corrosion resistance, with
And the ability of high temperature creep-resisting, it has been widely used in mechanical manufacturing field.
In traditional Castiron Melting technique, because molybdenum-iron fusing point is higher, the Adding Way of molybdenum element is typically by alloy molybdenum
Furnace charge bottom is placed on, 1600 DEG C or more are heated to furnace charge, until fusing obtains molten iron, is then poured into a mould with this molten iron,
Referred to as melt method.This method is disadvantageous in that：Production all must add in molybdenum element according to the molten metal of whole stove every time, raw
During production, when especially new product small lot is manufactured experimently, the remaining molten iron in stove, which need to isolate, to be scrapped, and raw material is caused to be wasted,
Production cost increases；In production scheduling, containing molybdenum with cannot arrange production simultaneously without molybdenum product, it is unfavorable for scheduling of production.
But if molybdenum-iron adds in solid form, since fusing point is higher, then it is difficult to melt, causes diffusion very uneven.
The content of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of molybdenum-iron diffusion melting method and its application,
Molybdenum-iron can be prepared under lower temperature, and is spread uniform.
The present invention provides a kind of molybdenum-irons to spread melting method, comprises the following steps：
(1) molybdenum-iron is crushed to 3~10mm, then at 500~600 DEG C, is calcined, obtain pretreated molybdenum
Iron；
(2) in the built-in bag of casting ladle pit, nodulizer, inovulant and pretreated molybdenum-iron are successively added in successively, it is described pre-
Treated, and molybdenum-iron is covered in surface；
(3) carry out pouring method spheroidising with 1400~1450 DEG C of molten iron, poured into a mould, be carried out at the same time secondary after taking off filter
Current-following inoculation.
Preferably, the calcining is sublevel section calcining, is specially：
500~540 DEG C calcining 10~20min, 550~590 DEG C calcining 10~15min, then 600 DEG C calcining 10~
20min。
Preferably, the nodulizer is as mass fraction, composed of the following components：
Mg 11.0%~14.0%；
RE 1.5%~1.8%；
Si 50%~52%；
The iron of surplus.
Preferably, the RE is Ce and La.
Preferably, the dosage of the nodulizer is 1.0wt%~1.2wt% of molten iron.
Preferably, the inovulant is as mass fraction, composed of the following components：
The inovulant of the secondary current-following inoculation is as mass fraction, composed of the following components：
Preferably, the dosage of the inovulant is 0.2wt%~0.4wt% of molten iron；The secondary current-following inoculation it is pregnant
Educate 0.2wt%~0.5wt% that agent dosage is molten iron.
Preferably, the dosage of the molybdenum-iron is 1wt%~2wt% of molten iron.
Preferably, the time for pouring method spheroidising is 0.5~1min.
The present invention also provides a kind of application of above-mentioned diffusion melting method in the production of silicon molybdenum nodular cast iron.
Compared with prior art, the present invention provides a kind of molybdenum-irons to spread melting method, comprises the following steps：(1) by molybdenum
Iron powder is broken to 3~10mm, then at 500~600 DEG C, is calcined, and obtains pretreated molybdenum-iron；(2) in casting ladle pit
Built-in bag successively adds in nodulizer, inovulant and pretreated molybdenum-iron, the pretreated molybdenum-iron and is covered in table successively
Face；(3) carry out pouring method spheroidising with 1400~1450 DEG C of molten iron, poured into a mould, be carried out at the same time secondary with stream after taking off filter
It breeds.The present invention by molybdenum-iron through pretreatment, directly add in solid form, make dystectic ferro-molybdenum at 1400 DEG C i.e.
Melting can be diffused, has the advantages that smelting temperature is low in stove, and can be completed in 1min, and is spread uniform.Meanwhile nothing
Molybdenum-iron with molten iron need to be melted jointly, can be scrapped to avoid the isolation of remaining molten iron in stove, save raw material；It and being capable of root
According to production spheroidal graphite cast-iron containing molybdenum and without molybdenum spheroidal graphite cast-iron, decide whether to place molybdenum-iron, and then be conducive to the quick of production scheduling
Switching, greatly reduces production cost.In the present invention, pretreated molybdenum-iron not only can completely, quickly melt, and be formed simultaneously
Certain crystallization nuclei has higher Oxygen potential, suitable for the production of cast silicone molybdenum nodular cast iron.
Description of the drawings
Fig. 1 is silicon molybdenum nodular cast iron inside metallographic figure prepared by the embodiment of the present invention 1.
Specific embodiment
The present invention provides a kind of molybdenum-irons to spread melting method, comprises the following steps：
(1) molybdenum-iron is crushed to 3~10mm, then at 500~600 DEG C, is calcined, obtain pretreated molybdenum
Iron；
(2) in the built-in bag of casting ladle pit, nodulizer, inovulant and pretreated molybdenum-iron are successively added in successively, it is described pre-
Treated, and molybdenum-iron is covered in surface；
(3) carry out pouring method spheroidising with 1400~1450 DEG C of molten iron, poured into a mould, be carried out at the same time secondary after taking off filter
Current-following inoculation.
Molybdenum-iron by pre-processing, is directly added in, makes dystectic ferro-molybdenum low in casting ladle by the present invention in solid form
Melting can be diffused under temperature, has the advantages that smelting temperature is low in stove, and can be completed in 1min, and is spread uniform.
Meanwhile without molybdenum-iron is melted jointly with molten iron, it can be scrapped to avoid the isolation of remaining molten iron in stove, save raw material；And
And it can decide whether to place molybdenum-iron, and then be conducive to production and adjust according to production spheroidal graphite cast-iron containing molybdenum and without molybdenum spheroidal graphite cast-iron
Being switched fast for degree, greatly reduces production cost.In the present invention, pretreated molybdenum-iron not only can completely, quickly melt,
Certain crystallization nuclei is formed simultaneously, there is higher Oxygen potential, suitable for the production of cast silicone molybdenum nodular cast iron.
The present invention first pre-processes molybdenum-iron, specifically, molybdenum-iron is crushed to 3~10mm, it is preferred that crushed
To 3~5mm, calcination processing is then carried out, the temperature of the calcining is preferably 500~600 DEG C.
Currently preferred, the calcining is sublevel section calcining, is specially：
500~540 DEG C calcining 10~20min, 550~590 DEG C calcining 10~15min, then 600 DEG C calcining 10~
20min。
In some embodiments of the invention, the calcining is 500 DEG C of calcining 20min, and 550 DEG C are calcined 15min, so
600 DEG C of calcining 20min afterwards.
The present invention is not particularly limited the method for above-mentioned crushing and calcining, can be side well known to those skilled in the art
Method.
The present invention is not particularly limited above-mentioned molybdenum-iron, can be molybdenum-iron well known to those skilled in the art, in the present invention
Some specific embodiments in, the molybdenum-iron be FeMo55-A.
After pretreatment, into luggage bag, the present invention is using with dimpled casting ladle.In the pit of above-mentioned casting ladle, successively by
Layer adds in nodulizer, inovulant and above-mentioned pretreated molybdenum-iron, the pretreated molybdenum-iron and is covered in surface.
In the present invention, the nodulizer as mass fraction, preferably includes：
11.0%~14.0% Mg, content are more preferably 12.0%~13.0%.
1.5%~1.8% RE, content are more preferably 1.6%~1.7%；The RE is preferably Ce and La, the Ce
Mass ratio with La is preferably 1：(1.5~1.8), more preferably 1：(1.6~1.7).
50%~52% Si, content are more preferably 50.5%~51.5%.
And the iron of surplus.
The dosage of the nodulizer is preferably 1.0wt%~1.2wt% of molten iron, and more preferably 1.05wt%~
1.1wt%.
The inovulant as mass fraction, preferably includes：
65%~68% Si, content are more preferably 66%~67%.
3%~5% Ca, content are more preferably 3.5%~4.5%.
3%~4% Al, content are more preferably 3.2%~3.8%.
4.2%~5% Ba, content are more preferably 4.5%~4.8%.
0.5%~2.5% S, content are more preferably 1%~2%.
The Ti of 0.1wt~0.3%, content are more preferably 0.15%~0.25%.
And the Mg of surplus.
The dosage of the inovulant is preferably 0.2wt%~0.4wt% of molten iron；More preferably 0.25wt%~
0.35wt%.
The dosage of the molybdenum-iron is preferably 1wt%~2wt% of molten iron, more preferably 1.4wt%~1.8wt%.
After the completion of dress bag, you can carried out pouring method spheroidising with 1400~1450 DEG C of molten iron, then carry out taking off filter, take off
It after clean slag, is poured into a mould, cast while carries out secondary current-following inoculation.
In the present invention, the time for pouring method spheroidising is preferably 0.5~1min.I.e. the present invention by molybdenum-iron into
Row pretreatment, and is aided with the inovulant and nodulizer of specific components, and molybdenum-iron can be made to be diffused melting at 1400 DEG C, and
Diffusion is completed within 1min to melt.
The inovulant of the secondary current-following inoculation as mass fraction, preferably includes：
65%~68% Si, content are more preferably 66%~67%.
3%~5% Ca, content are more preferably 3.5%~4.5%.
3%~4% Al, content are more preferably 3.2%~3.8%.
4.2%~5% Ba, content are more preferably 4.5%~4.8%.
0.5%~2.5% S, content are more preferably 1%~2%.
The Sr of 0.1wt~0.3%, content are more preferably 0.15%~0.25%.
And the Mg of surplus.
The dosage of the inovulant of the secondary current-following inoculation is preferably 0.2wt%~0.5wt% of molten iron, more preferably
0.3wt%~0.4wt%.
The present invention uses above-mentioned secondary current-following inoculation so that the tissue of ferro-molybdenum more dense uniform has better
Mechanical property.
The present invention also provides a kind of application of above-mentioned diffusion melting method in the production of silicon molybdenum nodular cast iron.
In order to further illustrate the present invention, molybdenum-iron provided by the invention is spread with reference to embodiment melting method and its
Using being described in detail.
Embodiment 1
Molybdenum-iron (FeMo55-A) is crushed, its granularity is made then to be calcined, specifically for 3~10mm：500 DEG C of calcinings
20min, 550 DEG C of calcining 15min, then calcines 20min for 600 DEG C.Obtain pretreated molybdenum-iron.
Using 400Kg casting ladles, in the built-in bag of casting ladle pit, the nodulizer of 1.1wt%, 0.3wt% are successively added in successively
The pretreated molybdenum-iron of inovulant and 1.5wt%, the pretreated molybdenum-iron are covered on casting ladle inner surface.Above-mentioned quality
Percentage is counted using molten iron as 100%.
The nodulizer component is (as mass fraction)：12.5% Mg, 0.64% Ce, 0.96% La, 52%
Si, the Fe of surplus.
The inovulant component is (as mass fraction)：67% Si, 3% Ca, 3.5% Al, 4.5% Ba,
1.5% S, 0.2% Ti and the Mg of surplus.
Using 5T/H furnace cupola+3T electro-smelting molten iron, until 1400 DEG C.
It is carried out pouring method spheroidising 1min with above-mentioned molten iron, be poured into a mould after taking off clean filter residue, using 0.3wt%'s during cast
Inovulant carries out secondary current-following inoculation, and the inovulant component is (as mass fraction)：67% Si, 3% Ca, 3.5%
Al, 4.5% Ba, 1.5% S, 0.2% Sr and the Mg of surplus.
The silicon molybdenum nodular cast iron inside metallographic of preparation is detected, the result is shown in Figure 1, has Fig. 1 as it can be seen that the silicon prepared
Molybdenum spheroidal graphite cast-iron inside metallographic is uniform.
Embodiment 2
Molybdenum-iron (FeMo55-A) is crushed, its granularity is made then to be calcined, specifically for 3~10mm：500 DEG C of calcinings
10min, 550 DEG C of calcining 15min, then calcines 15min for 600 DEG C.Obtain pretreated molybdenum-iron.
Using 400Kg casting ladles, in the built-in bag of casting ladle pit, the nodulizer of 1.0wt%, 0.2wt% are successively added in successively
The pretreated molybdenum-iron of inovulant and 1.8wt%, the pretreated molybdenum-iron are covered on casting ladle inner surface.Above-mentioned quality
Percentage is counted using molten iron as 100%.
The nodulizer component is (as mass fraction)：14% Mg, 0.6% Ce, 1.1% La, 50.5%
Si, the Fe of surplus.
The inovulant component is (as mass fraction)：66% Si, 4.5% Ca, 3.8% Al, 4.8%
Ba, 0.5% S, 0.25% Ti and the Mg of surplus.
Using 5T/H furnace cupola+3T electro-smelting molten iron, until 1400 DEG C.
It is carried out pouring method spheroidising 0.5min with above-mentioned molten iron, be poured into a mould after taking off clean filter residue, 0.4wt% is used during cast
Inovulant carry out secondary current-following inoculation, the inovulant component is (as mass fraction)：66% Si, 4.5% Ca,
3.8% Al, 4.8% Ba, 0.5% S, 0.25% Sr and the Mg of surplus.
The silicon molybdenum nodular cast iron inside metallographic of preparation is detected, the results showed that, the silicon molybdenum nodular cast iron of preparation
Inside metallographic is uniform.
Comparative example 1
Using 400Kg casting ladles, in the built-in bag of casting ladle pit, the nodulizer of 1.0wt%, 0.2wt% are successively added in successively
The molybdenum-iron of inovulant and 1.8wt% (FeMo55-A), the molybdenum-iron is covered on casting ladle inner surface.Above-mentioned mass percent is with iron
Water is 100% meter.
The nodulizer component is (as mass fraction)：14% Mg, 0.6% Ce, 1.1% La, 50.5%
Si, the Fe of surplus.
The inovulant component is (as mass fraction)：66% Si, 4.5% Ca, 3.8% Al, 4.8%
Ba, 0.5% S, 0.25% Ti and the Mg of surplus.
Using 5T/H furnace cupola+3T electro-smelting molten iron, until 1400 DEG C.
It is carried out pouring method spheroidising 0.5min with above-mentioned molten iron, molybdenum-iron only melts sub-fraction, can not subsequently be grasped
Make.
Comparative example 2
Molybdenum-iron (FeMo55-A) is crushed, its granularity is made then to be calcined, specifically for 3~10mm：500 DEG C of calcinings
10min, 550 DEG C of calcining 15min, then calcines 15min for 600 DEG C.Obtain pretreated molybdenum-iron.
Using 400Kg casting ladles, in the built-in bag of casting ladle pit, the nodulizer of 1.4wt%, 0.6wt% are successively added in successively
The pretreated molybdenum-iron of inovulant and 1.5wt%, the pretreated molybdenum-iron are covered on casting ladle inner surface.Above-mentioned quality
Percentage is counted using molten iron as 100%.
The nodulizer component is (as mass fraction)：5% Mg, 0.8% Ce, 1.2% La, 43% Si.
The inovulant component is (as mass fraction)：74% Si, 2.5% Ca, 1.0% Al, 2.5%
Ba。
Using 5T/H furnace cupola+3T electro-smelting molten iron, until 1400 DEG C.
It is carried out pouring method spheroidising 1min with above-mentioned molten iron, be poured into a mould after taking off clean filter residue, using 0.1wt%'s during cast
Inovulant carries out secondary current-following inoculation, and the inovulant component is (as mass fraction)：74% Si, 2.5% Ca,
1.0% Al, 2.5% Ba.
The silicon molybdenum nodular cast iron inside metallographic of preparation is detected, the results showed that, the silicon molybdenum nodular cast iron of preparation
Inside metallographic uniformity coefficient is slightly poor.
From above-described embodiment and comparative example, the present invention, can be at 1400 DEG C by being pre-processed to molybdenum-iron
Row diffusion melts, and spreads more uniform.
The explanation of above example is only intended to help to understand method and its core concept of the invention.It should be pointed out that pair
For those skilled in the art, without departing from the principle of the present invention, the present invention can also be carried out
Several improvement and modification, these improvement and modification are also fallen into the protection domain of the claims in the present invention.
Claims (10)
1. a kind of molybdenum-iron spreads melting method, which is characterized in that comprises the following steps：
(1) molybdenum-iron is crushed to 3~10mm, then at 500~600 DEG C, is calcined, obtain pretreated molybdenum-iron；
(2) in the built-in bag of casting ladle pit, nodulizer, inovulant and pretreated molybdenum-iron, the pretreatment are successively added in successively
Molybdenum-iron afterwards is covered in surface；
(3) carry out pouring method spheroidising with 1400~1450 DEG C of molten iron, poured into a mould, be carried out at the same time secondary with stream after taking off filter
It breeds.
2. diffusion melting method according to claim 1, which is characterized in that the calcining is sublevel section calcining, is specially：
Then 500~540 DEG C of calcinings 10~20min, 550~590 DEG C of 10~15min of calcining calcine 10~20min for 600 DEG C.
3. diffusion melting method according to claim 1, which is characterized in that the nodulizer as mass fraction, by with
The following group is grouped into：
Mg 11.0%~14.0%；
RE 1.5%~1.8%；
Si 50%~52%；
The iron of surplus.
4. diffusion melting method according to claim 3, which is characterized in that the RE is Ce and La.
5. diffusion melting method according to claim 1, which is characterized in that the dosage of the nodulizer is molten iron
1.0wt%~1.2wt%.
6. diffusion melting method according to claim 1, which is characterized in that the inovulant as mass fraction, by with
The following group is grouped into：
The inovulant of the secondary current-following inoculation is as mass fraction, composed of the following components：
7. diffusion melting method according to claim 1, which is characterized in that the dosage of the inovulant is molten iron
0.2wt%~0.4wt%；The inovulant dosage of the secondary current-following inoculation is 0.2wt%~0.5wt% of molten iron.
8. diffusion melting method according to claim 1, which is characterized in that the dosage of the molybdenum-iron is the 1wt% of molten iron
~2wt%.
9. diffusion melting method according to claim 1, which is characterized in that it is described pour method spheroidising time be
0.5~1min.
10. claim 1~9 any one of them spreads application of the melting method in silicon molybdenum nodular cast iron production.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1433483A (en) * | 2000-02-04 | 2003-07-30 | 特莱巴赫工业有限公司 | Porous agglomerates containning iron and at least one further element from groups 5 or 6 of the periodic table for use as alloying agent |
| CN101875126A (en) * | 2009-12-09 | 2010-11-03 | 金堆城钼业股份有限公司 | Ferromolybdenum granule treatment method |
| CN101935795A (en) * | 2010-08-17 | 2011-01-05 | 江铃汽车股份有限公司 | Diffusion and fusion method for ferromolybdenum and application thereof |
| CN104053799A (en) * | 2011-11-25 | 2014-09-17 | 法罗雷格林加股份公司 | Iron and molybdenum containing pellets |
-
2016
- 2016-10-10 CN CN201610884240.1A patent/CN106399811B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1433483A (en) * | 2000-02-04 | 2003-07-30 | 特莱巴赫工业有限公司 | Porous agglomerates containning iron and at least one further element from groups 5 or 6 of the periodic table for use as alloying agent |
| CN101875126A (en) * | 2009-12-09 | 2010-11-03 | 金堆城钼业股份有限公司 | Ferromolybdenum granule treatment method |
| CN101935795A (en) * | 2010-08-17 | 2011-01-05 | 江铃汽车股份有限公司 | Diffusion and fusion method for ferromolybdenum and application thereof |
| CN104053799A (en) * | 2011-11-25 | 2014-09-17 | 法罗雷格林加股份公司 | Iron and molybdenum containing pellets |
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