CN100494446C - Ductile cast iron inoculator, method for preparing product and application as smelting cast iron - Google Patents
Ductile cast iron inoculator, method for preparing product and application as smelting cast iron Download PDFInfo
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- CN100494446C CN100494446C CNB2007100181967A CN200710018196A CN100494446C CN 100494446 C CN100494446 C CN 100494446C CN B2007100181967 A CNB2007100181967 A CN B2007100181967A CN 200710018196 A CN200710018196 A CN 200710018196A CN 100494446 C CN100494446 C CN 100494446C
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Abstract
The present invention discloses inoculant for nodular graphite cast iron and gray cast iron and its preparation process and application in smelting cast iron. The inoculant consists of ferrosilicon, ferromanganese and silicobarium or ferrochromium, and contains Si, B, Mn, Al, Ca, Fe or Cr, and trace elements. It is prepared through crushing ferrosilicon, ferromanganese and silicobarium or ferrochromium; and mixing in certain proportion. When it is applied in smelting nodular graphite cast iron and gray cast iron, the inoculant is added into molten iron in the molten iron/inoculant weight ratio of 1 to 0.03-0.07. The compound inoculant has high inoculation effect, and can make the cast iron possess high tensile strength and high toughness.
Description
Technical field
The present invention relates to produce spheroidal graphite cast iron nucleating agent and preparing product method and as the application of smelting cast iron.
Background technology
At present, the method of producing spheroidal graphite cast iron or graphitic cast iron is multifarious, the spheroidal graphite cast iron that most of manufacturers use ferrosilicon to produce as nucleating agent, graphitic cast iron all is difficult to reach the GB technical requirements with the trade mark, and since the molten steel preparation that breeds production with ferrosilicon finish after the per minute molten iron all failing, just cannot say for sure to demonstrate,prove its pregnant effect about 8 minutes, so foundry goods that each iron clad water waters, because casting is successively different, quality differs greatly, therefore, can only use secondary, breed for three times or various means such as mould cavity inoculation guarantee quality product, and ferrosilicon nucleating agent physical presence pregnant effect is poor, troublesome poeration, and quality is difficult to guarantee.
Summary of the invention
The object of the invention provides a kind of breeding mechanism and preventing molten steel preparation decline and the fusing point different according to each material of multiple material of adopting, and improves the ironcasting unit elongation and the spheroidal graphite cast iron nucleating agent of the different preparations of velocity of diffusion in molten iron.
Another purpose of the present invention is the application of nucleating agent as smelting cast iron.
In order to overcome the deficiencies in the prior art, technical scheme of the present invention is to solve like this: the marked improvement of spheroidal graphite cast iron nucleating agent is that nucleating agent is by ferrosilicon, ferromanganese, silicon barium is formed, press mass ratio, wherein ferrosilicon is 20 parts～30 parts, ferromanganese is 20 parts～30 parts, silicon barium is 40 parts～70 parts, described ferrosilicon, ferromanganese, contain 23 parts～45 parts silicon in the silicon barium respectively, 10 parts～26 parts barium, 10 parts～14 parts manganese, 2 parts～6 parts aluminium, 2 parts～6 parts calcium, 20 parts～24 parts iron, 2 parts～3 parts trace element, described trace element is meant carbon, phosphorus, sulphur adds a kind of or any two or three interpolation simultaneously wherein.
A kind of spheroidal graphite cast iron nucleating agent is as the application of smelting spheroidal graphite cast iron, its marked improvement is that the ratio of molten ductile cast iron and nucleating agent is 1: 0.04～0.08, the same with common production when smelting spheroidal graphite cast iron, only need after nodularization, when replenishing molten iron, the spheroidal graphite cast iron nucleating agent is added with molten iron stream, after molten iron stirred during molten iron will wrap after rolling, with heat preserving agent molten iron is covered, promptly pourable.
If every iron clad water actual weight is 1 ton hour, nucleating agent lumpiness maximum value is ferrosilicon 10～20mm, silicon barium 20～30mm, ferromanganese 10～20mm, ferrochrome 5～15mm.
A kind of preparation method of described nucleating agent, carry out according to the following steps:
1), takes by weighing the various compositions of claim 1 or 2 described nucleating agents;
2), the ferrosilicon with above-mentioned, ferromanganese, silicon barium or ferrochrome carry out fragmentation, screening respectively, its screening lumpiness maximum value is ferrosilicon 10～20mm, silicon barium 20～30mm, ferromanganese 5～20mm, ferrochrome 1～15mm;
3), after the ferrosilicon with above-mentioned, ferromanganese, silicon barium or ferrochrome carry out fragmentation respectively, weigh in proportion mixing, packed for standby use;
Use when 4), the nucleating agent that mixes grating according to above-mentioned screening lumpiness with ferrosilicon, ferromanganese, silicon barium is used to smelt spheroidal graphite cast iron.
The present invention compared with prior art, this nucleating agent is that multiple to breed material formulated, according to multiple material to breed mechanism different with the fusing point of the effect that prevents molten steel preparation decline and every kind of material, the velocity of diffusion difference is formulated in molten iron, therefore improve pregnant effect greatly, thereby make cast iron as cast condition guarantee to show good toughness under the qualified situation of the tensile strength of its trade mark.Breed graphitic cast iron and use this nucleating agent, big refinement takes place in its pearlite matrix, and the HT300 matrix becomes superfine ball light body (sorbite tissue) by fine pearlite.Because the unit elongation of cast iron is greatly improved, and makes cast iron show good toughness, middle silicon spheroidal graphite cast iron RQTSi4 in generation in addition the quick-fried processing of water do not ftracture yet.Use this nucleating agent, factory can produce the cast condition ductile iron of the following various trades mark of QT700, and rate elongation increases substantially under normal production conditions.
As:
QT400-18 tensile strength 450Mpa, rate elongation is 24%
QT500-7 tensile strength 580Mpa, rate elongation is 15%
QT600-3 tensile strength 690Mpa, rate elongation is 10%
QT700-2 tensile strength 724Mpa, rate elongation is 6%
RQTSi4 tensile strength 600Mpa, rate elongation is 18.5%
Embodiment
Below in conjunction with embodiment this content is described further:
Embodiment 1
The spheroidal graphite cast iron nucleating agent is made up of ferrosilicon, ferromanganese, silicon barium, press mass ratio, wherein ferrosilicon is 20 parts～30 parts, ferromanganese is 20 parts～30 parts, silicon barium is 40 parts～70 parts, contain 23 parts～45 parts silicon in described ferrosilicon, ferromanganese, the silicon barium respectively, 10 parts～26 parts barium, 10 parts～14 parts manganese, 2 parts～6 parts aluminium, 2 parts～6 parts calcium, 20 parts～24 parts iron, 2 parts～3 parts trace element, described trace element is meant carbon, phosphorus, sulphur, adds a kind of or any two or three interpolation simultaneously wherein.
Embodiment 2
The spheroidal graphite cast iron nucleating agent is made up of ferrosilicon, ferromanganese, silicon barium, presses mass ratio, and wherein ferrosilicon is 26 parts～28 parts, ferromanganese is 27 parts～29 parts, 45 parts～65 parts of silicon barium contain 27 parts～43 parts silicon respectively, 15 parts～24 parts barium in described ferrosilicon, ferromanganese, the silicon barium, 11 parts～13 parts manganese, 3 parts～5 parts aluminium, 3 parts～5 parts calcium, 21 parts～23 parts iron, 2 parts～3 parts trace element, the interpolation of trace element is with embodiment 1.
Embodiment 3
The spheroidal graphite cast iron nucleating agent is made up of ferrosilicon, ferromanganese, silicon barium, press mass ratio, wherein ferrosilicon is 20 parts, 25 parts in ferromanganese, silicon barium is 50 parts, contain 23 parts～45 parts silicon in described ferrosilicon, ferromanganese, the silicon barium respectively, 25 parts barium, 14 parts manganese, 6 parts aluminium, 6 parts calcium, 24 parts iron, 2 parts carbon trace element.
Embodiment 4
The spheroidal graphite cast iron nucleating agent is made up of ferrosilicon, ferromanganese, silicon barium, press mass ratio, wherein ferrosilicon is 25 parts, 26 parts in ferromanganese, silicon barium is 45 parts, contain 27 parts～43 parts silicon in described ferrosilicon, ferromanganese, silicon barium, the ferrochrome respectively, 23 parts barium, 13 parts manganese, 5.5 the aluminium of part, 5.5 the calcium of part, 24 parts iron, 3 parts phosphorus trace element.
Embodiment 5
The spheroidal graphite cast iron nucleating agent is made up of ferrosilicon, ferromanganese, silicon barium, press mass ratio, wherein ferrosilicon is 27 parts, and ferromanganese is 28 parts, silicon barium is 55 parts, contain 30 parts silicon in described ferrosilicon, ferromanganese, the silicon barium, 24 parts barium, 12 parts manganese, 4.5 the aluminium of part, 4.5 the calcium of part, 22 parts iron, 3 parts sulphur trace element.
Embodiment 6
The spheroidal graphite cast iron nucleating agent is made up of ferrosilicon, ferromanganese, silicon barium, press mass ratio, wherein ferrosilicon is 29 parts, and ferromanganese is 24 parts, silicon barium is 57 parts, contain 40 parts silicon in described ferrosilicon, ferromanganese, the silicon barium, 17 parts barium, 11 parts manganese, 4 parts aluminium, 4.5 part calcium, 21 parts iron, the trace element of 2 parts of carbon, 0.5 phosphorus.
Embodiment 7
A kind of preparation method of described nucleating agent, carry out according to the following steps:
1), takes by weighing the various compositions of claim 1 or 2 or 3 or 4 described nucleating agents;
2), the ferrosilicon with above-mentioned, ferromanganese, silicon barium or ferrochrome carry out fragmentation, screening respectively, its screening lumpiness maximum value is ferrosilicon 10～20mm, silicon barium 20～30mm, ferromanganese 5～20mm, ferrochrome 1～15mm;
3), after the ferrosilicon with above-mentioned, ferromanganese, silicon barium or ferrochrome carry out fragmentation respectively, weigh in proportion mixing, packed for standby use;
Use when 4), the nucleating agent that mixes grating according to above-mentioned screening lumpiness with ferrosilicon, ferromanganese, silicon barium is used to smelt spheroidal graphite cast iron.
Embodiment 8
A kind of spheroidal graphite cast iron nucleating agent is as the application of smelting spheroidal graphite cast iron, the ratio of its molten ductile cast iron and nucleating agent is 1: 0.04～0.08, the same with common production when smelting spheroidal graphite cast iron, only need after nodularization, when replenishing molten iron, packaged spheroidal graphite cast iron nucleating agent is added with molten iron stream, after molten iron stirred during molten iron will wrap after rolling, with heat preserving agent molten iron is covered, promptly pourable, if every iron clad water actual weight is 1 ton hour, nucleating agent lumpiness maximum value is ferrosilicon 10～20mm, silicon barium 20～30mm, ferromanganese 10～20mm, ferrochrome 5～15mm.
Embodiment 9
The spheroidal graphite cast iron nucleating agent is as the application of smelting spheroidal graphite cast iron, the ratio of its molten ductile cast iron and nucleating agent is 1: 0.05～0.07, the same with common production when smelting spheroidal graphite cast iron, only need after nodularization, when replenishing molten iron, packaged spheroidal graphite cast iron nucleating agent is added with molten iron stream, after molten iron stirred during molten iron will wrap after rolling, with heat preserving agent molten iron is covered, promptly pourable, if every iron clad water actual weight is 1 ton hour, nucleating agent lumpiness maximum value is ferrosilicon 12～18mm, silicon barium 24～28mm, ferromanganese 12～18mm, ferrochrome 7～13mm.
Embodiment 10
The spheroidal graphite cast iron nucleating agent is as the application of smelting spheroidal graphite cast iron, the ratio of its molten ductile cast iron and nucleating agent is 1: 0.05, the same with common production when smelting spheroidal graphite cast iron, only need after nodularization, when replenishing molten iron, packaged spheroidal graphite cast iron nucleating agent is added with molten iron stream, after molten iron stirred during molten iron will wrap after rolling, with heat preserving agent molten iron is covered, promptly pourable, if every iron clad water actual weight is 1 ton hour, nucleating agent lumpiness maximum value is ferrosilicon 15mm, silicon barium 25mm, ferromanganese 15mm, ferrochrome 8mm.
Embodiment 11
The spheroidal graphite cast iron nucleating agent is as the application of smelting spheroidal graphite cast iron, the ratio of its molten ductile cast iron and nucleating agent is 1: 0.06, the same with common production when smelting spheroidal graphite cast iron, only need after nodularization, when replenishing molten iron, packaged spheroidal graphite cast iron nucleating agent is added with molten iron stream, after molten iron stirred during molten iron will wrap after rolling, with heat preserving agent molten iron is covered, promptly pourable, if every iron clad water actual weight is 1 ton hour, nucleating agent lumpiness maximum value is ferrosilicon 18mm, silicon barium 28mm, ferromanganese 18mm, ferrochrome 13mm.
In sum, further specify the using method of this nucleating agent:
1, various grade nodular cast iron Chemical Composition terms of reference all can be by specialized range control in the cast iron handbook;
During 2 these nucleating agents of use, Chemical Composition control is to increase silicon 0.15%, increases manganese about 0.05%;
3 is the same with common production when smelting nodular iron casting, only needs after nodularization, when replenishing molten iron, nucleating agent added with molten iron stream, after molten iron stirred during molten iron will wrap after rolling, with heat preserving agent molten iron covered, promptly pourable; Here said heat preserving agent should be this area heat preserving agent commonly used.
4, this nucleating agent belongs to long-acting nucleating agent, can not produce decline in 20 minutes, so, in casting process, no longer carry out secondary, three times and mould cavity inoculation.
Middle silicon heat-resisting ductile iron RQTSi4, behind casting solidification, the instant heating open form is removed dead head, and loose core in general the production; Or stay slow cooling in the sand mold, big part was answered more than 24～28 hours; Or carry out artificial aging (50～300 ℃/6 hours → 300～600 ℃/2 hours → 600 ℃/3～5 hours → stove is chilled to 150 and comes out of the stove) immediately, production is restricted, waste energy again, the heat-resisting RQTSi4 of middle silicon that uses the present invention to produce, because its unit elongation is brought up to more than 18% by 6～8%,, even adopt " water is quick-fried " technology can not ftracture even under the red heat state, directly unpack, production efficiency is greatly improved, and has saved the energy.
The spheroidal graphite cast iron thick and large casting is the difficult problem in the casting always, producing spheroidal graphite cast iron generally speaking goes out molten iron temperature and carries out spheroidizing and breed at 1460 ℃～1520 ℃, need after breeding to pour into a mould as early as possible, not so can produce decaying spheroidisation, but teeming temperature is too high, can make molten iron setting time in die cavity long again, produce segregation, have multiple casting flaws such as composition is inhomogeneous, therefore, in composition control, be difficult to reach requirement, influence technical target of the product.Adopt nucleating agent of the present invention, when producing thick big nodular iron casting, because molten iron did not fail in 30 minutes, so just can after the molten iron pyroprocessing, molten iron be poured into a mould after " calmness ", because teeming temperature control is lower, molten steel solidification time weak point in the die cavity, Chemical Composition is even, and segregation significantly reduces, create good condition for thick big nodular iron casting casting technique, thereby can obtain the qualified ironcasting of performance.
Claims (5)
1, a kind of spheroidal graphite cast iron nucleating agent, it is characterized in that nucleating agent is made up of ferrosilicon, ferromanganese, silicon barium, press mass ratio, wherein ferrosilicon is 20 parts～30 parts, ferromanganese is 20 parts～30 parts, silicon barium is 40 parts～70 parts, contain 23 parts～45 parts silicon in described ferrosilicon, ferromanganese, the silicon barium respectively, 10 parts～26 parts barium, 10 parts～14 parts manganese, 2 parts～6 parts aluminium, 2 parts～6 parts calcium, 20 parts～24 parts iron, 2 parts～3 parts trace element, described trace element is meant carbon, phosphorus, sulphur, adds a kind of or any two or three interpolation simultaneously wherein.
2, spheroidal graphite cast iron nucleating agent according to claim 1, it is characterized in that nucleating agent is made up of ferrosilicon, ferromanganese, silicon barium, press mass ratio, wherein ferrosilicon is 26 parts～28 parts, ferromanganese is 27 parts～29 parts, 45 parts～65 parts of silicon barium, contain 27 parts～43 parts silicon in described ferrosilicon, ferromanganese, the silicon barium respectively, 15 parts～24 parts barium, 11 parts～13 parts manganese, 3 parts～5 parts aluminium, 3 parts～5 parts calcium, 21 parts～23 parts iron, 2 parts～3 parts trace element adds a kind of or any two or three interpolation simultaneously wherein.
3, the preparation method of a kind of claim 1 or 2 described nucleating agents, carry out according to the following steps:
1), takes by weighing the various compositions of claim 1 or 2 described nucleating agents;
2), the ferrosilicon with above-mentioned, ferromanganese, silicon barium or ferrochrome carry out fragmentation, screening respectively, its screening lumpiness maximum value is ferrosilicon 10～20mm, silicon barium 20～30mm, ferromanganese 5～20mm, ferrochrome 1～15mm;
3), after the ferrosilicon with above-mentioned, ferromanganese, silicon barium or ferrochrome carry out fragmentation respectively, weigh in proportion mixing, packed for standby use;
Use when 4), the nucleating agent that mixes grating according to above-mentioned screening lumpiness with ferrosilicon, ferromanganese, silicon barium is used to smelt spheroidal graphite cast iron.
4, a kind of claim 1 or 2 spheroidal graphite cast iron nucleating agents are as the application of smelting spheroidal graphite cast iron, the ratio that it is characterized in that molten ductile cast iron and nucleating agent is 1: 0.04～0.08, the same with common production when smelting spheroidal graphite cast iron, only need after nodularization, when replenishing molten iron, the spheroidal graphite cast iron nucleating agent is added with molten iron stream, after molten iron stirred during molten iron will wrap after rolling, with heat preserving agent molten iron is covered, promptly pourable.
5, spheroidal graphite cast iron nucleating agent according to claim 4 is as the application of smelting spheroidal graphite cast iron, the ratio that it is characterized in that molten ductile cast iron and nucleating agent is 1: 0.05～0.07, the same with common production when smelting spheroidal graphite cast iron, only need after nodularization, when replenishing molten iron, the spheroidal graphite cast iron nucleating agent is added with molten iron stream, after molten iron stirred during molten iron will wrap after rolling, with heat preserving agent molten iron is covered, promptly pourable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100181967A CN100494446C (en) | 2007-07-06 | 2007-07-06 | Ductile cast iron inoculator, method for preparing product and application as smelting cast iron |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100181967A CN100494446C (en) | 2007-07-06 | 2007-07-06 | Ductile cast iron inoculator, method for preparing product and application as smelting cast iron |
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| Publication Number | Publication Date |
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| CN101082096A CN101082096A (en) | 2007-12-05 |
| CN100494446C true CN100494446C (en) | 2009-06-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102392175B (en) * | 2011-10-20 | 2014-02-12 | 宁波康发铸造有限公司 | Inoculant |
| CN103394656A (en) * | 2013-08-15 | 2013-11-20 | 张传海 | Preparation method for combined nucleating agent used for casting |
| CN103722157A (en) * | 2014-01-02 | 2014-04-16 | 铜陵市大成轧辊有限责任公司 | Production method of ultra-strong wear-resisting double-alteration centrifugal composite roller |
| CN106048135B (en) * | 2016-07-12 | 2018-01-09 | 江苏捷帝机器人股份有限公司 | For improving the composition of liquid metal flows |
| CN110273041A (en) * | 2018-03-13 | 2019-09-24 | 溧阳市联华机械制造有限公司 | A kind of cast iron pretreating agent |
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Assignee: Xi'an China National Light Industry Paper Machinery Group Co., Ltd. Assignor: Yang Yonggang Contract fulfillment period: 2007.10.5 to 2027.7.6 contract change Contract record no.: 2009610000134 Denomination of invention: Ductile cast iron inoculator, method for preparing product and application as smelting cast iron Granted publication date: 20090603 License type: Exclusive license Record date: 2009.12.7 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2007.10.5 TO 2027.7.6; CHANGE OF CONTRACT Name of requester: CHINA NATIONAL LIGHT INDUSTRY PAPER MACHINERY GROU Effective date: 20091207 |
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