CN103882279A - Method for smelting high-strength grey-iron cast - Google Patents
Method for smelting high-strength grey-iron cast Download PDFInfo
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- 229910001060 Gray iron Inorganic materials 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000003723 Smelting Methods 0.000 title abstract 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 93
- 229910052742 iron Inorganic materials 0.000 claims abstract description 37
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000005266 casting Methods 0.000 claims abstract description 16
- 230000006698 induction Effects 0.000 claims abstract description 14
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 12
- UVGLBOPDEUYYCS-UHFFFAOYSA-N silicon zirconium Chemical compound [Si].[Zr] UVGLBOPDEUYYCS-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 11
- 239000010959 steel Substances 0.000 claims abstract description 11
- 229910000805 Pig iron Inorganic materials 0.000 claims abstract description 10
- 239000002667 nucleating agent Substances 0.000 claims abstract description 10
- 229910000616 Ferromanganese Inorganic materials 0.000 claims abstract description 6
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 230000008018 melting Effects 0.000 claims description 48
- 238000002844 melting Methods 0.000 claims description 48
- 229910052710 silicon Inorganic materials 0.000 claims description 13
- 229910001018 Cast iron Inorganic materials 0.000 claims description 10
- 229910052748 manganese Inorganic materials 0.000 claims description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 239000000470 constituent Substances 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 229910052720 vanadium Inorganic materials 0.000 claims description 4
- GJEAMHAFPYZYDE-UHFFFAOYSA-N [C].[S] Chemical compound [C].[S] GJEAMHAFPYZYDE-UHFFFAOYSA-N 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 239000010439 graphite Substances 0.000 abstract description 12
- 229910002804 graphite Inorganic materials 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 5
- 238000011081 inoculation Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000002054 inoculum Substances 0.000 abstract 2
- 241001062472 Stokellia anisodon Species 0.000 abstract 1
- 238000011010 flushing procedure Methods 0.000 abstract 1
- 238000010792 warming Methods 0.000 abstract 1
- 230000005496 eutectics Effects 0.000 description 7
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 238000003556 assay Methods 0.000 description 3
- 229910001562 pearlite Inorganic materials 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 241001614291 Anoplistes Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a method for smelting high-strength grey-iron cast. A steel scrap, pig iron and foundry returns are taken as raw materials to carry out smelting of the grey-iron cast. The smelting method concretely comprises the following steps: firstly, adding ferromanganese iron and pig iron into a medium-frequency induction furnace, and then simultaneously adding a carburetant and the steel scrap; adding silicon carbide and simultaneously adding the foundry returns to smelt when smelting into 3/4 of the volume of molten iron in the induction furnace; warming up base iron to 1500-1520 DEG C, and then stewing for 5-10 minutes; flushing a silicon zirconium inoculant and the base iron into an iron bag; casting into a casting cavity after drossing the surface of the molten iron. By adopting the method disclosed by the invention, the manufacturing method is reduced, and management of the foundry returns is facilitated. The final strength of the cast is improved by adopting 60% of steel scrap, the molten iron is subjected to pretreatment by adopting the method for simultaneously smelting silicon carbide and furnace charge, and the pretreatment effect is ensured. The inoculation effect is ensured by adopting an efficient nucleating agent and the silicon zirconium inoculant, and over 80% of graphite A is obtained from a metallographic phase of a casting body.
Description
Technical field
The present invention relates to a kind of melting method of gray iron casting, relate in particular to a kind of melting method of high-strength gray cast iron part, belong to chemical melting field.
Background technology
The cocrystallizing type alloy that graphitic cast iron is made up of iron, carbon and silicon on substantially, wherein, carbon mainly exists with the form of graphite.Produce premium casting, form and the matrix metal tissue of controlling the graphite forming when cast iron solidified are vital.Inoculation is one of most important link in production technique.Good inoculation can make graphitic cast iron have satisfactory microstructure, thereby ensures mechanical property and the processing characteristics of foundry goods.In liquid cast, add nucleating agent, can form the micro-core in a large amount of Asias, impel eutectic cell to generate in liquid phase.While approaching eutectic solidification temperature, first raw core place forms tiny graphite flake, and grows into thus eutectic cell.The formation of each eutectic cell, all can peripherad liquid phase discharge a small amount of heat, and the eutectic cell of formation is more, and the solidification rate of cast iron is just lower.The reduction of solidification rate, just contributes to solidify by iron-graphite stable system, and can obtain A type graphite tissue.
General, good inoculation has following effect: (1) is eliminated or alleviated chilling tendency; (2) avoid occurring over-cooling structure; (3) alleviate the sectional sensitivity of ironcasting, make the difference of thin, the thick section microstructure of foundry goods little, difference in hardness is also little; (4) be conducive to the raw core of eutectic cell, Eutectic Cell Number is increased; (5) making the form of Graphite in Cast Iron is mainly tiny and equally distributed A type graphite, thereby improves the mechanical property of cast iron.Breed good cast iron mobility better, contraction minimizing, the processing characteristics of foundry goods improved, residual stress reduces.
When the traditional high trade mark gray iron casting of medium-frequency induction furnace melting, must add alloy element copper or tin, increase manufacturing cost.
Summary of the invention
The object of this invention is to provide a kind of melting method of high-strength gray cast iron part, to solve the difficult problem that above-mentioned manufacturing cost is high, and can obtain the A type graphite of higher yields.
The technical solution used in the present invention is: a kind of melting method of high-strength gray cast iron part, is characterized in that: taking trade mark Q235 as steel scrap, the trade mark carry out the melting of gray iron casting as the pig iron of Q10 and gray iron foundry returns as raw material; Described melting concrete steps are:
(1) pig iron that is first Q10 by 0.8～1% ferromanganese and 10% trade mark together adds in medium-frequency induction furnace, then adds the steel scrap that 2.5% carburelant and 60% trade mark are Q235 simultaneously, finally adds 30% gray iron foundry returns melting;
(2) at cast iron melting to 3/4 o'clock of induction furnace volume, carry out melting after adding 0.6～0.7% silicon carbide to add gray iron foundry returns full to stove simultaneously and form molten iron;
(3) by step 2 be heated to 1440～1460 DEG C time, use carbon sulphur instrument to measure C content in molten iron 3.00～3.10%;
(4) molten iron in step 3 is heated to after 1500～1520 DEG C, induction furnace is adjusted to keeping warm mode, molten iron leaves standstill 5～10 minutes and forms base iron;
(5) 0.5～0.6% silicon zirconium nucleating agent and base iron are together poured in the bag that taps a blast furnace and form whole molten iron, whole molten iron drossing pours into casting mold die cavity after clean subsequently, and setting pouring temperature is 1380～1410 DEG C, and pouring time is 1～2 minute.
Further, in the pig iron that in described step 1, the trade mark is Q10, the massfraction of each moiety is respectively C:4.45～4.50%, Si:0.75～0.80%, Mn:0.12～0.15%, P:0.023～0.027%, S:0.009～0.015%, Cr:0.033～0.040%, Ti:0.02～0.030%, V: 0.010～0.020%, surplus is Fe.
Further, in the steel scrap that in described step 1, the trade mark is Q235, the massfraction of each moiety is respectively C:0.23～0.30%, Si:0.15～0.18%, Mn:0.43～0.55 %, P:0.019～0.025%, S:0.021～0.030%, Cr:0.017～0.020%, Ti:0.001～0.003%, V:0.001～0.004%, surplus is Fe.
Further, in described step 1, each constituent mass mark of carburelant is respectively nitrogen :≤0.02%, and carbon: 98～100%, impurity 0～1.88%.
Further, in described step 2, the massfraction of silicon carbide is 88～90%, wherein silicon: 60～63%, and carbon: 27%, impurity 10～13%; Granularity 1～the 5mm of described silicon carbide.
Further, in described step 5, each constituent mass mark of silicon zirconium nucleating agent is respectively Si:73.1%, Zr:2.42%, and surplus is Fe.
Further, in described step 5, the granularity of silicon zirconium nucleating agent is 0.2～0.6mm.
Beneficial effect: method of the present invention must add alloy element copper or tin while having replaced traditional high trade mark gray iron casting of medium-frequency induction furnace melting, has reduced manufacturing cost, and is convenient to the management of foundry returns; Present method adopts the method for silicon carbide and furnace charge melting simultaneously to carry out pre-treatment to molten iron, has ensured pretreated effect; Adopt effective inoculation agent silicon zirconium nucleating agent to ensure the effect breeding, make to obtain more than 80% A type graphite in foundry goods body metallographic, foundry goods body tensile strength reaches between 270～300, body surface E type graphite≤20%, centre≤5%.
Brief description of the drawings
Fig. 1 is A type graphite distribution plan in the structure of body coupon of the present invention.
Fig. 2 is the perlite figure of body coupon of the present invention.
Embodiment
Implementation column below can make those skilled in the art more fully understand the present invention, but does not therefore limit the present invention among described scope of embodiments.
embodiment 1
A kind of melting method of high-strength gray cast iron part: steel scrap taking the trade mark as Q235, the trade mark carry out the melting of gray iron casting as the pig iron of Q10 and foundry returns as raw material; Melting concrete steps are:
(1) pig iron that is first Q10 by 0.8% ferromanganese and 10% trade mark together adds in medium-frequency induction furnace, then adds the steel scrap that 2.5% carburelant and 60% trade mark are Q235 simultaneously, finally adds 30% foundry returns melting;
(2) at cast iron melting to 3/4 o'clock of induction furnace volume, form molten iron to carry out melting after the silicon carbide that adds 0.6% in induction furnace adds gray iron foundry returns full to stove simultaneously;
(3) by step 2 be heated to 1440～1460 DEG C time, use carbon sulphur instrument to measure C content in molten iron 3.00～3.10%;
(4) base iron in step 2 is heated to after 1500～1520 DEG C, induction furnace is adjusted to keeping warm mode, molten iron leaves standstill 5～10 minutes and forms base iron;
(5) 0.5% silicon zirconium nucleating agent and base iron are together poured and tapped a blast furnace in bag, pour in casting mold die cavity simultaneously and cast again subsequently, it is 1380-1410 DEG C that pouring temperature is set, and pouring time is 1～2 minute.
According to the melting method of the present embodiment, the each component concentration of the base iron of melting meets: C:3.00-3.10%, Si:1.30-1.40%, Mn:0.6%-0.9%, P≤0.05%, S:0.08-0.010%;
The each component concentration of whole molten iron of melting meets: C:3.00-3.10%, Si:1.70-1.80%, Mn:0.6%-0.9%, P≤0.05%, S:0.08-0.010%.
The assay of the present embodiment melting gray iron casting is that tensile strength reaches 276, and surface hardness reaches 220, and content of pearlite in alloy is 98%.
embodiment 2
Be 0.9% by the ferromanganese amount adding, Silicon carbide addition is 0.65%, and silicon zirconium innoculant adding quantity is 0.55%, carries out melting according to the melting method described in embodiment 1.
According to the melting method of the present embodiment, the each component concentration of the base iron of melting meets: C:3.00-3.10%, Si:1.30-1.40%, Mn:0.6%-0.9%, P≤0.05%, S:0.08-0.010%;
The each component concentration of whole molten iron of melting meets: C:3.00-3.10%, Si:1.70-1.80%, Mn:0.6%-0.9%, P≤0.05%, S:0.08-0.010%.
The assay of the present embodiment melting gray iron casting is that tensile strength reaches 281, and surface hardness reaches 228, and content of pearlite in alloy is 98.5%.
embodiment 3
Be 1% by the ferromanganese amount adding, Silicon carbide addition is 0.7%, and silicon zirconium innoculant adding quantity is 0.6%, carries out melting according to the melting method described in embodiment 1.
According to the melting method of the present embodiment, the each component concentration of the base iron of melting meets: C:3.00-3.10%, Si:1.30-1.40%, Mn:0.6%-0.9%, P≤0.05%, S:0.08-0.010%;
The each component concentration of whole molten iron of melting meets: C:3.00-3.10%, Si:1.70-1.80%, Mn:0.6%-0.9%, P≤0.05%, S:0.08-0.010%.
The assay of the present embodiment melting gray iron casting is that tensile strength reaches 277, and surface hardness reaches 236, and content of pearlite in alloy is 98.9%.
Claims (7)
1. a melting method for high-strength gray cast iron part, is characterized in that: taking trade mark Q235 as steel scrap, the trade mark carry out the melting of gray iron casting as the pig iron of Q10 and gray iron foundry returns as raw material; Described melting concrete steps are:
(1) pig iron that is first Q10 by 0.8～1% ferromanganese and 10% trade mark together adds in medium-frequency induction furnace, then adds the steel scrap that 2.5% carburelant and 60% trade mark are Q235 simultaneously, finally adds 30% gray iron foundry returns melting;
(2) at cast iron melting to 3/4 o'clock of induction furnace volume, carry out melting after adding 0.6～0.7% silicon carbide to add gray iron foundry returns full to stove simultaneously and form molten iron;
(3) by step 2 be heated to 1440～1460 DEG C time, use carbon sulphur instrument to measure C content in molten iron 3.00～3.10%;
(4) molten iron in step 3 is heated to after 1500～1520 DEG C, induction furnace is adjusted to keeping warm mode, molten iron leaves standstill 5～10 minutes and forms base iron;
(5) 0.5～0.6% silicon zirconium nucleating agent and base iron are together poured and tapped a blast furnace in bag, form whole molten iron, pour into casting mold die cavity after whole molten iron drossing is clean, setting pouring temperature is 1380～1410 DEG C, and pouring time is 1～2 minute.
2. the melting method of high-strength gray cast iron part according to claim 1, it is characterized in that: in the pig iron that in described step 1, the trade mark is Q10, the massfraction of each moiety is respectively C:4.45～4.50%, Si:0.75～0.80%, Mn:0.12～0.15%, P:0.023～0.027%, S:0.009～0.015%, Cr:0.033～0.040%, Ti:0.02～0.030%, V: 0.010～0.020%, surplus is Fe.
3. the melting method of high-strength gray cast iron part according to claim 1, it is characterized in that: in the steel scrap that in described step 1, the trade mark is Q235, the massfraction of each moiety is respectively C:0.23～0.30%, Si:0.15～0.18%, Mn:0.43～0.55 %, P:0.019～0.025%, S:0.021～0.030%, Cr:0.017～0.020%, Ti:0.001～0.003%, V:0.001～0.004%, surplus is Fe.
4. the melting method of high-strength gray cast iron part according to claim 1, is characterized in that: in described step 1, each constituent mass mark of carburelant is respectively nitrogen :≤0.02%, and carbon: 98～100%, impurity 0～1.88%.
5. the melting method of high-strength gray cast iron part according to claim 1, is characterized in that: in described step 2, the massfraction of silicon carbide is 88～90%, wherein silicon: 60～63%, and carbon: 27%, impurity 10～13%; Granularity 1～the 5mm of described silicon carbide.
6. the melting method of high-strength gray cast iron part according to claim 1, is characterized in that: in described step 5, each constituent mass mark of silicon zirconium nucleating agent is respectively Si:73.1%, Zr:2.42%, and AL:0.82%, surplus is Fe.
7. the melting method of high-strength gray cast iron part according to claim 1, is characterized in that: in described step 5, the granularity of silicon zirconium nucleating agent is 0.2～0.6mm.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104195412A (en) * | 2014-08-14 | 2014-12-10 | 芜湖国鼎机械制造有限公司 | High-strength gray cast iron and cast parts and preparation method thereof |
| CN104962801A (en) * | 2015-06-06 | 2015-10-07 | 朱瑞瑞 | Smelting method of high-strength gray cast iron |
| CN104988269A (en) * | 2015-06-06 | 2015-10-21 | 刘飞 | High-strength gray iron casting smelting method |
| CN105648305A (en) * | 2016-04-18 | 2016-06-08 | 宝鸡市晨瑞鑫铸造有限责任公司 | High-strength gray cast iron material and preparation method thereof |
| CN106011360A (en) * | 2016-07-01 | 2016-10-12 | 宁国市开源电力耐磨材料有限公司 | Smelting technology of high-strength low-stress gray pig iron |
| CN106077529A (en) * | 2016-07-01 | 2016-11-09 | 成都桐林铸造实业有限公司 | Promote the inovulant of pearlite, using method and use the cylinder body of this inovulant |
| CN106755700A (en) * | 2016-11-17 | 2017-05-31 | 石卫东 | Amorphous inovulant for gray cast iron and preparation method thereof and application method |
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| CN111270039A (en) * | 2020-04-02 | 2020-06-12 | 江苏力源金河铸造有限公司 | Smelting process for reducing D, E type graphite in surface matrix structure of gray iron piece |
| CN112589054A (en) * | 2020-12-20 | 2021-04-02 | 十堰市泰祥实业股份有限公司 | Sand-lined casting method for gray cast iron automobile engine main bearing cap iron mold |
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| CN104195412A (en) * | 2014-08-14 | 2014-12-10 | 芜湖国鼎机械制造有限公司 | High-strength gray cast iron and cast parts and preparation method thereof |
| CN104962801A (en) * | 2015-06-06 | 2015-10-07 | 朱瑞瑞 | Smelting method of high-strength gray cast iron |
| CN104988269A (en) * | 2015-06-06 | 2015-10-21 | 刘飞 | High-strength gray iron casting smelting method |
| CN105648305B (en) * | 2016-04-18 | 2017-12-01 | 宝鸡市晨瑞鑫铸造有限责任公司 | High-strength gray cast iron material and preparation method thereof |
| CN105648305A (en) * | 2016-04-18 | 2016-06-08 | 宝鸡市晨瑞鑫铸造有限责任公司 | High-strength gray cast iron material and preparation method thereof |
| CN106077529B (en) * | 2016-07-01 | 2018-07-24 | 成都桐林铸造实业有限公司 | Promote inovulant, application method and the cylinder body using the inovulant of pearlite |
| CN106077529A (en) * | 2016-07-01 | 2016-11-09 | 成都桐林铸造实业有限公司 | Promote the inovulant of pearlite, using method and use the cylinder body of this inovulant |
| CN106011360A (en) * | 2016-07-01 | 2016-10-12 | 宁国市开源电力耐磨材料有限公司 | Smelting technology of high-strength low-stress gray pig iron |
| CN106755700A (en) * | 2016-11-17 | 2017-05-31 | 石卫东 | Amorphous inovulant for gray cast iron and preparation method thereof and application method |
| CN110157975A (en) * | 2019-06-28 | 2019-08-23 | 含山县兴达球墨铸铁厂 | A kind of preparation method of high-strength thin-walled gray iron casting |
| CN110923554A (en) * | 2019-12-12 | 2020-03-27 | 中国第一汽车股份有限公司 | Method for smelting high-strength commercial vehicle cylinder body |
| CN111270039A (en) * | 2020-04-02 | 2020-06-12 | 江苏力源金河铸造有限公司 | Smelting process for reducing D, E type graphite in surface matrix structure of gray iron piece |
| CN111270039B (en) * | 2020-04-02 | 2021-10-26 | 江苏力源金河铸造有限公司 | Smelting process for reducing D, E type graphite in surface matrix structure of gray iron piece |
| CN112589054A (en) * | 2020-12-20 | 2021-04-02 | 十堰市泰祥实业股份有限公司 | Sand-lined casting method for gray cast iron automobile engine main bearing cap iron mold |
| CN117778871A (en) * | 2023-11-28 | 2024-03-29 | 肇庆精通机械有限公司 | Method for preparing high-performance gray cast iron by adding piston scrap iron |
| CN117778871B (en) * | 2023-11-28 | 2024-06-07 | 肇庆精通机械有限公司 | Method for preparing high-performance gray cast iron by adding piston scrap iron |
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| CN103882279B (en) | 2015-11-18 |
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