CN102260818B - Manufacturing method of high-silicon anticorrosion cast iron - Google Patents
Manufacturing method of high-silicon anticorrosion cast iron Download PDFInfo
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- CN102260818B CN102260818B CN 201110205158 CN201110205158A CN102260818B CN 102260818 B CN102260818 B CN 102260818B CN 201110205158 CN201110205158 CN 201110205158 CN 201110205158 A CN201110205158 A CN 201110205158A CN 102260818 B CN102260818 B CN 102260818B
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Abstract
The invention discloses high-silicon anticorrosion cast iron, which comprises the following components in percentage by weight: 0.8 to 1.0 percent of C, 14.3 to 14.5 percent of Si, 1.0 to 1.5 percent of Mn, 1.5 to 2.0 percent of Cu, 1.2 to 2.2 percent of Cr, 0.4 to 0.5 percent of Mo, 0.05 to 0.1 percent of rare-earth element and the balance of Fe, wherein the content of P is within 0.1 percent, and the content of S is within 0.1 percent. The invention also relates to a manufacturing method for the cast iron.
Description
Technical field
The present invention relates to a kind of cast iron, particularly a kind of high silicon corrosiron.The invention still further relates to the manufacture method of this cast iron.
Background technology
At present, the scope of application of high silicon corrosiron is more and more wider, and its main application has whizzer, submersible pump, chemical industry equipment, valve, cock, tower tank, pipe fitting, low pressure vessel, supplementary anode foundry goods etc.Although traditional high silicon corrosiron can be worked in corrosive medium, it is high owing to silicon content, thereby often occurs the defectives such as pore, pine contracting in the cast iron; And the heat conductivility of this kind cast iron is poor, and shrinking percentage reaches, and easily produces cracking.These defectives all cause the work-ing life of high silicon corrosiron shorter.Simultaneously, mechanical property and the cutting ability of existing high silicon corrosiron are poor, can't satisfy modern work requirements.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the defective of the cast iron existence of prior art, a kind of high silicon corrosiron is provided, in the erosion resistance that guarantees cast iron, increase the work-ing life of cast iron.The technical problem that the present invention further will solve is: the manufacture method that this cast iron is provided.
In order to achieve the above object, the technical scheme of high silicon corrosiron employing of the present invention is:
High silicon corrosiron is characterized in that being comprised of following component by weight percentage: C:0.8-1.0%; Si:14.3-14.5%; Mn:1.0-1.5%; Cu:1.5-2.0%; Cr:1.2-2.2%; Mo:0.4-0.5%; Rare earth element: 0.05-0.1%; Surplus is Fe; Wherein, the content of P is in 0.1%, and the content of S is in 0.1%.
Impact on cast iron describes the below on the component in the cast iron and content range thereof:
When the content of Si:Si was lower than 14.3%, the intensity of cast iron can be increased, but erosion resistance can reduce; And the content of Si is when being higher than 14.5%, although the erosion resistance of cast iron is improved, the fragility of cast iron increases.
The content range of Mn:Mn in cast iron is subject to the restriction of the content of C.Be on the basis of 0.8-1.0% at C content, the content of Mn be set as 1.0-1.5%, can improve cast iron fragility at normal temperatures, when Mn content exceeds 1.5%, although the intensity of cast iron, hardness increase, but plasticity and toughness drop; When Mn content is lower than 1.0%, then substantially can not bring impact to cast iron.
S:S is harmful element in high silicon cast iron.Can reduce the intensity of cast iron, promote the contraction of cast iron, and cause that the really up to the mark and crackle of cast iron forms.The content of S should be controlled in 0.1%.
P:P also is harmful element in high silicon cast iron.Increasing the shrinkage cavity and porosity that can make cast iron and the tearing tendency of cast iron being increased of P content simultaneously, used Mo in the cast iron of the present invention, and this moment, the existence of P can cause P-Mo quaternary eutectic, increased the fragility of cast iron.Thereby the content of P should be controlled in 0.1%.
Cu: in cast iron, add Cu, can refinement and improve the even distribution of graphite, can reduce the chilling tendency of cast iron, can reduce the austenitic transformation critical temperature again, refinement and increase and advance perlite has Beneficial Effect to sensitivity profile.The content of Cu can not bring impact 1.5% when following substantially on cast iron, and the content of Cu is 2.0% when above, and the hardness of cast iron obviously reduces.
In cast iron, the content that makes by weight percentage the content of Cr reach 1.2-2.2%, Mo reaches 0.4-0.5%, and these two kinds of elements cooperate with Si, can improve the erosion resistance of cast iron; The rare earth element that in cast iron, adds 0.05-0.1, not only can eliminate the trace elements such as titanium in the cast iron, antimony, bismuth, arsenic, tin, lead to the detrimentally affect of nodularization, and obviously reduce the defectives such as magnesium iron shrinkage porosite, slag inclusion, subsurface porosity, and can also improve the mechanical property of cast iron, improve cutting ability.
In order to prepare this cast iron, the technical solution used in the present invention comprises following operation:
(1) preparation of raw material operation: configure by weight furnace charge, furnace charge comprises: 20-30 part Z14# pig iron, 50-60 part steel scrap, 17.5-21.5 part 75# ferrosilicon, 1.2-1.7 part manganeseirom, 3.0-4.0 part ferrochrome, 1.6-2.2 part fine copper, 0.4-0.5 part ferro-molybdenum, 0.08-0.15 part rare earth ferroalloy; Also configure by weight 0.5-1.0 part nucleating agent;
(2) melting, smelting procedure: at the melt in furnace furnace charge, raw material is adjusted elemental composition after all melting, and then is warming up to 1480-1500 ℃ and comes out of the stove;
(3) breed operation: after iron liquid is come out of the stove, the nucleating agent that configures is poured in the iron liquid, and left standstill 2-3 minute at iron liquid surface coverage perlite, namely can pour into a mould after breeding.
For overcoming high silicon corrosiron poor thermal conductivity, shrinking percentage is large, easily produces the defective of cracking, and a kind of preferred as the technical program in operation (3) afterwards, also has
(4) annealing operation: make the temperature of the foundry goods of cast be down to 720 ℃-770 ℃, foundry goods is taken out from sand mold, put into and be preheated to 770 ℃ heat treatment furnace, reheat to 850 ℃-900 ℃ insulations 2-4 hour, then be chilled to room temperature with the speed of 30 ℃/h and come out of the stove.
Embodiment
Below in conjunction with embodiment the high silicon corrosiron of the present invention is described further.In following examples, if no special instructions, all umbers and per-cent are all calculated by weight.
At first the component of the raw material that uses in following examples described, but the component of following raw material, content be not as limitation of the present invention:
The Z14# pig iron: C:4.19%; Si:1.46%; Mn:0.76%; P:0.04%; S:0.036%.
Steel scrap: C:0.15%; Si:0.35%; Mn:0.05%; P:0.05%; S:0.05%.
75# ferrosilicon: Si:75%, surplus is Fe.
Manganeseirom: Mn:65%, surplus is Fe.
Ferrochrome: Cr:50%, surplus is Fe.
Ferro-molybdenum: Mo:60%, surplus is Fe.
Rare earth ferroalloy: rare earth element 95%, surplus are Fe; Rare earth element wherein comprises: Ce:45%, La:17%, Pr:6%, Nd:27%.
In following examples, use the 75# ferrosilicon as nucleating agent.
Embodiment 1:
(1) configuration furnace charge, furnace charge comprises: 20 parts of Z14# pig iron, 50 parts of steel scraps, 17.5 parts of 75# ferrosilicon, 1.2 parts of manganeseiroms, 3.0 parts of ferrochromes, 1.6 parts of fine copper, 0.4 part of ferro-molybdenum, 0.08 part of rare earth ferroalloy; Also configure simultaneously 0.5 part of nucleating agent;
(2) at the melt in furnace furnace charge, raw material is adjusted elemental composition after all melting, and then is warming up to 1482 ℃ and comes out of the stove;
(3) after iron liquid is come out of the stove, the nucleating agent that configures is poured in the iron liquid, and left standstill 2 minutes at iron liquid surface coverage perlite, cast after breeding.
The cast iron that obtains thus is comprised of following component: C:0.8%; Si:14.3%; Mn:1.0%; Cu:1.5%; Cr:1.2%; Mo:0.4%; Rare earth element: 0.05%; Surplus is Fe; Wherein, the content of P is that the content of 0.03%, S is 0.01%.
Embodiment 2:
(1) configuration furnace charge, furnace charge comprises: 25 parts of Z14# pig iron, 55 parts of steel scraps, 19.5 parts of 75# ferrosilicon, 1.3 parts of manganeseiroms, 3.4 parts of ferrochromes, 1.7 parts of fine copper, 0.46 part of ferro-molybdenum, 0.1 part of rare earth ferroalloy; Also configure simultaneously 0.6 part of nucleating agent;
(2) at the melt in furnace furnace charge, raw material is adjusted elemental composition after all melting, and then is warming up to 1490 ℃ and comes out of the stove;
(3) after iron liquid is come out of the stove, the nucleating agent that configures is poured in the iron liquid, and left standstill 2.5 minutes at iron liquid surface coverage perlite, cast after breeding.
The cast iron that obtains thus comprises following component: C:0.9%; Si:14.4%; Mn:1.3%; Cu:1.7%; Cr:1.8%; Mo:0.45%; Rare earth element: 0.08%; Surplus is Fe; Wherein, the content of P is that the content of 0.05%, S is controlled at 0.03%.
Embodiment 3:
(1) configuration furnace charge, furnace charge comprises: 30 parts of Z14# pig iron, 60 parts of steel scraps, 21.5 parts of 75# ferrosilicon, 1.7 parts of manganeseiroms, 4.0 parts of ferrochromes, 2.2 parts of fine copper, 0.5 part of ferro-molybdenum, 0.15 part of rare earth ferroalloy; Also configure simultaneously 1.0 parts of nucleating agents;
(2) at the melt in furnace furnace charge, raw material is adjusted elemental composition after all melting, and then is warming up to 1500 ℃ and comes out of the stove;
(3) after iron liquid is come out of the stove, the nucleating agent that configures is poured in the iron liquid, and left standstill 3 minutes at iron liquid surface coverage perlite, cast after breeding.
The cast iron that obtains thus is comprised of following component: C:1.0%; Si:14.5%; Mn:1.5%; Cu:2.0%; Cr:2.2%; Mo:0.5%; Rare earth element: 0.1%; Surplus is Fe; Wherein, the content of P is that the content of 0.08%, S is 0.09%.
In above embodiment, the content of impurity P, S must be controlled in 0.1%, eliminate the harmful effect that it brings cast iron.
The cast iron of above-described embodiment is detected according to GB/T 8491-1987 standard, obtains various technical indicators as follows:
Embodiment 1: bending strength: 195MP; Hardness: 350HBV; Amount of deflection: 0.66f/mm.
Embodiment 2: bending strength: 200MP; Hardness: 380HBV; Amount of deflection: 0.68f/mm.
Embodiment 2: bending strength: 210MP; Hardness: 400HBV; Amount of deflection: 0.72f/mm.
Can be learnt by above-mentioned data, cast iron of the present invention not only has very high corrosion resistance nature, and the life-span of ironcasting is also increased.
The above has done detailed explanation in conjunction with embodiment to the present invention, but the present invention is not limited to this.Any those skilled in the art under the prerequisite of aim of the present invention, can make various distortion and modification to the present invention in the ken that possesses.
Claims (5)
1. the manufacture method of a high silicon corrosiron is characterized in that: comprise by weight percentage following component: C:0.8-1.0%; Si:14.3-14.5%; Mn:1.0-1.5%; Cu:1.5-2.0%; Cr:1.2-2.2%; Mo:0.4-0.5%; Rare earth element: 0.05-0.1%; Surplus is Fe; Wherein, the content of P is in 0.1%, and the content of S comprises following operation in 0.1%:
(1) preparation of raw material operation: configure by weight furnace charge, furnace charge comprises: 20-30 part Z14# pig iron, 50-60 part steel scrap, 17.5-21.5 part 75# ferrosilicon, 1.2-1.7 part manganeseirom, 3.0-4.0 part ferrochrome, 1.6-2.2 part fine copper, 0.4-0.5 part ferro-molybdenum, 0.08-0.15 part rare earth ferroalloy; Also configure by weight 0.5-1.0 part nucleating agent;
(2) melting, smelting procedure: at the melt in furnace furnace charge, raw material is adjusted elemental composition after all melting, and then is warming up to 1480-1500 ℃ and comes out of the stove;
(3) breed operation: after iron liquid is come out of the stove, the nucleating agent that configures is poured in the iron liquid, and left standstill 2-3 minute at iron liquid surface coverage perlite, cast after breeding.
2. method according to claim 1, it is characterized in that: in operation (3), perlitic add-on is the 1-2% according to the weight percent of iron liquid.
3. method according to claim 1 is characterized in that: in operation (3) afterwards, also have
(4) annealing operation: make the temperature of the foundry goods of cast be down to 720 ℃-770 ℃, foundry goods is taken out from sand mold, put into and be preheated to 770 ℃ heat treatment furnace, reheat to 850 ℃-900 ℃ insulations 2-4 hour, then be chilled to room temperature with the speed of 30 ℃/h and come out of the stove.
4. each described method according to claim 1-3 is characterized in that: the smelting furnace that described method adopts is medium-frequency induction furnace.
5. method according to claim 4 is characterized in that: in operation (2), add successively from the bottom up first the Z14# pig iron, steel scrap in electric furnace; With 40% power blow-on, afterwards furnace power was risen to 90% in 5 minutes first; In the furnace charge melting process, constantly add steel scrap, 75# ferrosilicon, manganeseirom, ferrochrome, fine copper, ferro-molybdenum, rare earth ferroalloy, the furnace charge that configures is all melted.
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| CN 201110205158 CN102260818B (en) | 2011-07-21 | 2011-07-21 | Manufacturing method of high-silicon anticorrosion cast iron |
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| CN 201110205158 CN102260818B (en) | 2011-07-21 | 2011-07-21 | Manufacturing method of high-silicon anticorrosion cast iron |
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| CN102260818B true CN102260818B (en) | 2013-01-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102744378A (en) * | 2012-06-08 | 2012-10-24 | 安徽省繁昌县皖南阀门铸造有限公司 | Casting method of valve core of butterfly valve |
| CN102965566A (en) * | 2012-09-11 | 2013-03-13 | 青岛和德隆机械有限公司 | Raw material composition of marine knife gate valve ductile iron casting and its production method |
| CN102864368B (en) * | 2012-10-15 | 2014-03-19 | 南京信息工程大学 | Inoculated cast iron and preparation method thereof |
| CN102888552A (en) * | 2012-11-02 | 2013-01-23 | 青岛和德隆机械有限公司 | Raw material composition and production method for plate type precision valve cast |
| CN102912063B (en) * | 2012-11-05 | 2016-02-24 | 青岛和德隆机械有限公司 | The feedstock composition of high-silicon cast iron liquid alkali valve cast and production method thereof |
| CN103146989A (en) * | 2013-03-18 | 2013-06-12 | 青岛有畅防腐防雷材料有限公司 | Centrifugal casting method of chromium-containing high silicon cast iron anode tube |
| CN104480367A (en) * | 2014-11-28 | 2015-04-01 | 周正英 | Multifunctional submersible pump |
| CN104493504A (en) * | 2014-11-28 | 2015-04-08 | 周正英 | Sliding seat |
| CN104492553A (en) * | 2014-11-28 | 2015-04-08 | 周正英 | Closed sand mill |
| CN105112769A (en) * | 2015-09-02 | 2015-12-02 | 新绛县祥和机械有限公司 | Raw material formula and pouring technology of gray cast iron |
| CN105536932A (en) * | 2015-12-08 | 2016-05-04 | 四川金欣机械有限公司 | High-chromium bimetal liquid composite hammer and preparation method thereof |
| CN108588321A (en) * | 2018-05-04 | 2018-09-28 | 合肥东凌铸件工业有限公司 | A kind of production technology of spheroidal graphite cast-iron |
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| KR100400905B1 (en) * | 2001-05-25 | 2003-10-08 | 주식회사 우진 | High silicon cast iron with improved acid-resistance, and manufacturing method thereof |
| CN1291055C (en) * | 2003-12-29 | 2006-12-20 | 北京科技大学 | Process for preparing high silicon anti-corrosion cast iron |
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