CN104451020A - Technology for producing spheroidal graphite cast iron - Google Patents
Technology for producing spheroidal graphite cast iron Download PDFInfo
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- CN104451020A CN104451020A CN201310421673.XA CN201310421673A CN104451020A CN 104451020 A CN104451020 A CN 104451020A CN 201310421673 A CN201310421673 A CN 201310421673A CN 104451020 A CN104451020 A CN 104451020A
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- spheroidal graphite
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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 technology for producing spheroidal graphite cast iron, which is characterized in that by optimizing a casting mold technology, a proper filtering cast system is employed, a reasonable chemical component is selected, spheroidising and inoculating treatment can be controlled, high-quality ductile iron pig iron is selected, and the qualified castings of the spheroidal graphite cast iron with -40 DEG C low-temperature impact can be produced by a graphite pretreatment technology and the filtering cast technology. The technology comprises the steps of selecting the raw auxiliary materials of pig iron, waste steel, an inoculants and a nodulizer, melting in an electric furnace, spheroidising, tapping and inoculating, performing stream inoculation, pretreating graphite, filtering and casting, casting test block, performing shot blast cleaning, processing test block, performing a low-temperature impact tensile test, and performing UT, MT and RT flaw detection. The technology is suitable for producing the spheroidal graphite cast iron with -40 DEG C low-temperature impact.
Description
Technical field
The present invention relates to a kind of production technique of spheroidal graphite cast iron, especially relate to a kind of production technique of-40 DEG C of low-temperature impact spheroidal graphite cast iron.
Background technology
Big cross section high tenacity low-temperature impact spheroidal graphite cast iron obtains widespread use in wind-power electricity generation and Transit Equipment, needs low-temperature ball spheroidal graphite cast iron part 800,000 tons year.Foundry goods generally adopts European standard (EN-GJS-400-18U-LT, ENGJS-350-22U-LT), casting quality requires very strict, foundry goods service requirements: component working inclement condition, and reliability requirement is high, material performance requirement is high, and foundry goods will through UT, MT, RT nondestructive testing.
Summary of the invention
The object of the invention is to the problem for above-mentioned big cross section high tenacity low-temperature impact spheroidal graphite cast iron, provide a kind of design technology advanced, product strength is high, the production technique of good-40 DEG C of low-temperature impact spheroidal graphite cast iron of low temperature impact properties.
In order to achieve the above object, the production technique of-40 DEG C of low-temperature impact spheroidal graphite cast iron that the present invention adopts is: by optimizing foundry processing, adopt suitable filtration gating system, select rational chemical composition, control spheroidizing and inoculation, select the high-quality magnesium iron pig iron, Graphitic pretreatment technology, filter placingJi Shu, produce the castings of-40 DEG C of low-temperature impact spheroidal graphite cast iron.
Technical process of the present invention is:
Raw and auxiliary material-pig iron, steel scrap, nucleating agent, nodulizing agent-electrosmelting-spheroidizing (once covering inoculation)-tap a blast furnace breed, current-following inoculation, Graphitic pretreatment-(fresh sand, resin sand, solidifying agent-mulling-casting mold)-filtration cast-attached casting test block-impeller blasting-processing test block-low-temperature impact tension test-UT, MT, RT flaw detection.
(1) selection of raw and auxiliary material
In order to reach the requirement of low-temperature impact toughness, require that furnace charge must be pure, select the high-quality magnesium iron pig iron, the impurity such as the manganese in starting material, phosphorus, sulphur, titanium must control at minimum level, wherein trace wants below 10PPM without the content of plain BP, BI, SB, TE, and in steel scrap, impurity content controls at minimum level.
(2) electrosmelting
Adopt the fusing of 12T medium-frequency induction furnace, furnace charge is heated to 1500-1520 DEG C, through chemical examination, to 1450-1460 DEG C after adjusting component, teeming temperature controls at 1350 ± 10 DEG C
(3) spheroidizing
Spheriodization process thereof adopts spheroidizing treatment technology by rush-in method, and nodulizing agent adopts the nodulizing agent of the special wine made of broomcorn millet, and add-on controls at 1.2-1.5%, adopts three inoculation.
(4) Graphitic pretreatment technology
Adopt Graphitic pretreatment technology, because the nucleus pre-treatment of molten iron is very important, the density of material can be improved, reduce shrinkage cavity shrinkage porosity tendency, adopt Graphitic pretreatment method, can refinement graphite, improve the roundness of graphite.Concrete working method is: after adjustment chemical composition, because pretreating agent has carburetting effect, therefore molten iron carbon content will be made lower than target value 0.2%, after ladle desulfurisation, molten iron is refunded electric furnace, when electric furnace poured into by 1/4 molten iron, liquid level adds the agent of 0.2-0.25% Graphitic pretreatment, then residue molten iron is all refunded, heat up and stir 5MIN, until during tapping temperature 1450 ± 10 DEG C, tap a blast furnace and carry out spheroidization and inoculation process.
(5) placingJi Shu is filtered
Select ceramic foam filter, molten iron purification best results.Filtration can make the graphite refinement of spheroidal graphite cast iron, and ball number increases, and roundness improves, and in matrix, ferrite content increases, and either pearlite occurred reduces; Filtration improves the plasticity of spheroidal graphite cast iron and the effective way of toughness, and through filtering, extension and the cold impact value of low-temperature ball spheroidal graphite cast iron significantly improve.
The present invention compared with prior art, has following obvious advantage and innovation.(1) technique is advanced.The present invention adopts the high-quality iron ball pig iron, and Graphitic pretreatment and filtration placingJi Shu have novelty.(2) product performance intensity is high, and low temperature impact properties is good.Spheroidal graphite cast iron of the present invention is while guaranteeing mechanical property δ b >=400Mpa, the attached casting test block of 70mm-40 DEG C of low-temperature impact toughness mean value >=10J, be not only the material do not had in middle standard, simultaneously more than the performance requriements of EN-GJS-400-18U-LT, ENGJS-350-22U-LT.
The present invention is applicable to manufacture-40 DEG C of low-temperature impact spheroidal graphite cast iron.
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Accompanying drawing explanation
Accompanying drawing is production process route figure of the present invention
Embodiment
As shown in the figure, its technical process is:
(1) selection of raw and auxiliary material
In order to reach the requirement of low-temperature impact toughness, require that furnace charge must be pure, select the high-quality magnesium iron pig iron, the impurity such as the manganese in starting material, phosphorus, sulphur, titanium must control at minimum level, wherein trace wants below 10PPM without the content of plain BP, BI, SB, TE, and in steel scrap, impurity content controls at minimum level.
(2) electrosmelting
Adopt the fusing of 12T medium-frequency induction furnace, furnace charge is heated to 1500-1520 DEG C, through chemical examination, to 1450-1460 DEG C after adjusting component, teeming temperature controls at 1350 ± 10 DEG C
(3) spheroidizing
Spheriodization process thereof adopts spheroidizing treatment technology by rush-in method, and nodulizing agent adopts the nodulizing agent of the special wine made of broomcorn millet, and add-on controls at 1.2-1.5%, adopts three inoculation.
(4) Graphitic pretreatment technology
Adopt Graphitic pretreatment technology, because the nucleus pre-treatment of molten iron is very important, the density of material can be improved, reduce shrinkage cavity shrinkage porosity tendency, adopt Graphitic pretreatment method, can refinement graphite, improve the roundness of graphite.Concrete working method is: after adjustment chemical composition, because pretreating agent has carburetting effect, therefore molten iron carbon content will be made lower than target value 0.2%, after ladle desulfurisation, molten iron is refunded electric furnace, when electric furnace poured into by 1/4 molten iron, liquid level adds the agent of 0.2-0.25% Graphitic pretreatment, then residue molten iron is all refunded, heat up and stir 5MIN, until during tapping temperature 1450 ± 10 DEG C, tap a blast furnace and carry out spheroidization and inoculation process.
(5) placingJi Shu is filtered
Select ceramic foam filter, molten iron purification best results.Filtration can make the graphite refinement of spheroidal graphite cast iron, and ball number increases, and roundness improves, and in matrix, ferrite content increases, and either pearlite occurred reduces; Filtration improves the plasticity of spheroidal graphite cast iron and the effective way of toughness, and through filtering, extension and the cold impact value of low-temperature ball spheroidal graphite cast iron significantly improve.
The present invention is applicable to manufacture-40 DEG C of low-temperature impact spheroidal graphite cast iron.
Claims (6)
1. a production technique for spheroidal graphite cast iron, it is characterized in that raw and auxiliary material-pig iron, steel scrap, nucleating agent, nodulizing agent-electrosmelting-spheroidizing ,-secondary covering inoculation-tap a blast furnace breed, current-following inoculation, Graphitic pretreatment-(fresh sand, resin sand, solidifying agent-mulling-casting mold)-filtration cast-attached casting test block-impeller blasting-processing test block-low-temperature impact tension test-UT, MT, RT flaw detection.
2. the production technique of spheroidal graphite cast iron according to claim 1, it is characterized in that the selection of raw and auxiliary material, require that furnace charge must be pure, select the high-quality magnesium iron pig iron, the impurity such as the manganese in starting material, phosphorus, sulphur, titanium must control at minimum level, wherein trace wants below 10PPM without the content of plain BP, BI, SB, TE, and in steel scrap, impurity content controls at minimum level.
3. the production technique of spheroidal graphite cast iron according to claim 1, it is characterized in that electrosmelting adopts the fusing of 12T medium-frequency induction furnace, furnace charge is heated to 1500-1520 DEG C, through chemical examination, to 1450-1460 DEG C after adjusting component, teeming temperature controls at 1350 ± 10 DEG C.
4. the production technique of spheroidal graphite cast iron according to claim 1, it is characterized in that spheriodization process thereof adopts spheroidizing treatment technology by rush-in method, nodulizing agent adopts the nodulizing agent of the special wine made of broomcorn millet, and add-on controls at 1.2-1.5%, adopts three inoculation.
5. the production technique of spheroidal graphite cast iron according to claim 1, it is characterized in that adopting Graphitic pretreatment technology, adopt Graphitic pretreatment method, can refinement graphite, improve the roundness of graphite, concrete working method is: after adjustment chemical composition, because pretreating agent has carburetting effect, therefore molten iron carbon content will be made lower than target value 0.2%, after ladle desulfurisation, molten iron is refunded electric furnace, when electric furnace poured into by 1/4 molten iron, liquid level adds the agent of 0.2-0.25% Graphitic pretreatment, then residue molten iron is all refunded, heat up and stir 5Min, until during tapping temperature 1450 ± 10 DEG C, tap a blast furnace and carry out spheroidization and inoculation process.
6. the production technique of spheroidal graphite cast iron according to claim 1, is characterized in that filtering placingJi Shu selects ceramic foam filter.
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| CN201310421673.XA CN104451020A (en) | 2013-09-12 | 2013-09-12 | Technology for producing spheroidal graphite cast iron |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106424572A (en) * | 2016-11-06 | 2017-02-22 | 薛献来 | Low-temperature ferrite ductile cast iron auxiliary casting test block preparation method |
| CN110016606A (en) * | 2019-05-17 | 2019-07-16 | 重庆银河铸锻有限责任公司 | A kind of electro-smelting method of high-strength cast iron part |
| CN110129660A (en) * | 2019-05-17 | 2019-08-16 | 重庆银河铸锻有限责任公司 | A kind of electro-smelting method of corrosion-resistant High-Hardness Cast Iron part |
| CN110257581A (en) * | 2019-06-06 | 2019-09-20 | 郑石竹 | A kind of spheroidal graphite casting production system and preparation process |
| CN111036859A (en) * | 2019-12-19 | 2020-04-21 | 唐山钢铁集团有限责任公司 | Spheroidizing inoculation treatment method for high-strength nodular cast iron roller |
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| CN101407884A (en) * | 2008-10-24 | 2009-04-15 | 常州卓润风能设备有限公司 | Smelting technique for cast of wind energy apparatus |
| CN101947636A (en) * | 2010-04-09 | 2011-01-19 | 温州开诚机械有限公司 | Composite molding process of alkaline phenol formaldehyde resin facing sand and ester-hardened sodium silicate backing sand |
| CN102260767A (en) * | 2010-05-24 | 2011-11-30 | 鹰潭晨宇重型机械有限公司 | Method for producing minus 40 DEG C low temperature casting-state nodular graphite cast iron with large cross section |
| CN102268506A (en) * | 2011-07-06 | 2011-12-07 | 华中科技大学 | Method for preparing nodular cast iron |
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- 2013-09-12 CN CN201310421673.XA patent/CN104451020A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101407884A (en) * | 2008-10-24 | 2009-04-15 | 常州卓润风能设备有限公司 | Smelting technique for cast of wind energy apparatus |
| CN101947636A (en) * | 2010-04-09 | 2011-01-19 | 温州开诚机械有限公司 | Composite molding process of alkaline phenol formaldehyde resin facing sand and ester-hardened sodium silicate backing sand |
| CN102260767A (en) * | 2010-05-24 | 2011-11-30 | 鹰潭晨宇重型机械有限公司 | Method for producing minus 40 DEG C low temperature casting-state nodular graphite cast iron with large cross section |
| CN102268506A (en) * | 2011-07-06 | 2011-12-07 | 华中科技大学 | Method for preparing nodular cast iron |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106424572A (en) * | 2016-11-06 | 2017-02-22 | 薛献来 | Low-temperature ferrite ductile cast iron auxiliary casting test block preparation method |
| CN106424572B (en) * | 2016-11-06 | 2019-04-09 | 亚新科国际铸造（山西）有限公司 | A kind of attached casting test block preparation method of low temperature ferrite ductile cast iron |
| CN110016606A (en) * | 2019-05-17 | 2019-07-16 | 重庆银河铸锻有限责任公司 | A kind of electro-smelting method of high-strength cast iron part |
| CN110129660A (en) * | 2019-05-17 | 2019-08-16 | 重庆银河铸锻有限责任公司 | A kind of electro-smelting method of corrosion-resistant High-Hardness Cast Iron part |
| CN110016606B (en) * | 2019-05-17 | 2022-01-25 | 重庆机床(集团)有限责任公司 | Electric furnace smelting method for high-strength iron castings |
| CN110257581A (en) * | 2019-06-06 | 2019-09-20 | 郑石竹 | A kind of spheroidal graphite casting production system and preparation process |
| CN111036859A (en) * | 2019-12-19 | 2020-04-21 | 唐山钢铁集团有限责任公司 | Spheroidizing inoculation treatment method for high-strength nodular cast iron roller |
| CN111036859B (en) * | 2019-12-19 | 2021-07-09 | 唐山钢铁集团有限责任公司 | Spheroidizing inoculation treatment method for high-strength nodular cast iron roller |
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Application publication date: 20150325 |