CN105861915B - The preparation method of ferrite ductile cast iron - Google Patents
The preparation method of ferrite ductile cast iron Download PDFInfo
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- CN105861915B CN105861915B CN201610496177.4A CN201610496177A CN105861915B CN 105861915 B CN105861915 B CN 105861915B CN 201610496177 A CN201610496177 A CN 201610496177A CN 105861915 B CN105861915 B CN 105861915B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
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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
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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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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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 relates to spheroidal graphite cast-iron field, and in particular to a kind of preparation method of ferrite ductile cast iron, the mass percent of each element composition is in the ferrite ductile cast iron：Carbon 3.5% 3.8%, silicon 2.4% 2.7%, manganese 0.29% 0.35%, cerium 0.03% 0.04%, magnesium 0.045% 0.06%, yttrium 0.08% 0.1%, molybdenum 0.01% 0.02%, rhenium 0.02% 0.03%, phosphorus≤0.04%, sulphur≤0.018%, surplus are iron, and its preparation method specifically includes following steps：(1) raw material is melted with medium-frequency induction furnace, then carries out desulfurization process；(2) silicon carbide powder and magnesium-rare earth are poured into nodularization bag after mixing, covers the first inovulant above, carry out spheroidising and first time inoculation, then carry out second of inoculation, poured into a mould, obtain casting；(3) casting is heat-treated, obtains ferrite ductile cast iron, the ferrite ductile cast iron Oxygen potential in the present invention is high, has higher intensity and excellent toughness and impact plasticity, and preparation method is simply efficient.
Description
Technical field
The present invention relates to spheroidal graphite cast-iron field, and in particular to a kind of preparation method of ferrite ductile cast iron.
Background technology
China's spheroidal graphite cast-iron production starting very early, just succeed in developing and put into production, so far China's spheroidal graphite cast-iron by nineteen fifty
Annual output after the U.S., Japan, ranks the third of the world position up to 2,300,000 tons.It is adapted to grinding for the rare earth magnesium nodularizer of China's national situation
Work(is made, the production technology of the every field such as cast condition ductile iron and Austenite-Bainite Ductile Iron and research work are equal
Very high technical merit is reached.Ferrite ductile cast iron refers to ferrite content in matrix and is more than 80%, the remaining ball for pearlite
Black cast iron, has good impact plasticity and toughness, but intensity is relatively low.It is larger and bear to shake and rush that it is used to manufacturing stress
The part hit, is largely used to the departments such as automobile, agricultural machinery, ship, metallurgy, chemical industry, as important cast iron materials.
The principal element for influencing ferrite ductile cast iron plasticity is chemical composition, the size of graphite nodule and shape, remaining
Free cementite and field trash phase, ferritic grain size etc..103060671 A of Chinese patent CN disclose a kind of " ferrite
Spheroidal graphite cast-iron and preparation method thereof ", the invention adjust carbon, silicon, the content of manganese in molten iron, iron by selecting good raw material
Water is handled through deoxidizing purification, pretreatment, spheroidization and inoculation, obtains high-intensity and high-tenacity ferrite ductile cast iron, but for described
The intensity and toughness of ferritic spheroidal graphite casting can also further improve.
The content of the invention
The present invention provides a kind of preparation method of ferrite ductile cast iron, the ferrite ductile cast iron has higher
Intensity and excellent toughness and impact plasticity, and preparation method is simply efficient.
In order to achieve the above object, the present invention is achieved by the following technical programs：
A kind of ferrite ductile cast iron, the mass percent of each element component is in the ferrite ductile cast iron：Carbon
3.5%-3.8%, silicon 2.4%-2.7%, manganese 0.29%-0.35%, cerium 0.03%-0.04%, magnesium 0.045%-0.06%, yttrium
0.08%-0.1%, molybdenum 0.01%-0.02%, rhenium 0.02%-0.03%, phosphorus≤0.04%, sulphur≤0.018%, surplus are iron.
Preferably, the mass percent of each element component is in the ferrite ductile cast iron：Carbon 3.6%, silicon 2.5%,
Manganese 0.32%, cerium 0.035%, magnesium 0.05%, yttrium 0.09%, molybdenum 0.015%, rhenium 0.025%, phosphorus≤0.04%, sulphur≤
0.018%, surplus is iron.
The preparation method of ferrite ductile cast iron, specifically includes following steps：
(1) low-phosphorous, low-sulfur high duty pig iron and steel scrap are melted with medium-frequency induction furnace at 1450-1480 DEG C,
The content of each element in molten iron all is detected after fusing, and adjusts each element content to recipe requirements are met, then carries out desulfurization
Processing；
(2) magnesium-rare earth of silicon carbide powder and molten iron gross weight 1.3%-1.5% are poured into nodularization after mixing
In bag, consolidation, above uniform fold molten iron gross weight 0.4%-0.6% inovulant, pour 3/4ths of molten iron total amount, it is complete
Into after spheroidising and first time inoculation, a quarter of molten iron total amount is poured, by molten iron gross weight 0.2%-0.4%'s
Inovulant is poured with stream, completes second of inoculation, cast, obtains casting；
(3) casting is heated to 900-950 DEG C, keeps the temperature 2-4h, 550- is cooled to the speed of 10-12 DEG C/min
600 DEG C, then it is air-cooled to room temperature；Casting after will be air-cooled is heated to 700-750 DEG C, keeps the temperature 3-5h, is dropped with the speed of 2-4 DEG C/min
Temperature is to 550-600 DEG C, then is air-cooled to room temperature, obtains the ferrite ductile cast iron.
Preferably, the weight ratio of the pig iron and steel scrap is 8-9:2-3.
Preferably, in the step (2) carborundum addition be molten iron gross weight 0.35%-0.45%.
Preferably, the granularity of the magnesium-rare earth is 0.5-1.5mm.
Preferably, the mass percent of each element component is in the inovulant：Silicon 40%-50%, calcium 2%-2.5%,
Barium 0.4%-0.7%, manganese 2%-3%, molybdenum 0.1%-0.2%, rhenium 0.3-0.5%, surplus are iron.
Beneficial effects of the present invention are：The present invention uses after being sufficiently mixed carborundum and nodulizer, both act synergistically,
Number of graphite ball and ferrite content can be dramatically increased, is had well to improving Oxygen potential, reduction dendrite, reducing shrinkage porosite generation tendency
Effect.Molybdenum and rhenium are added in inovulant, the intensity and plasticity of spheroidal graphite cast-iron can be improved, ball can be increased by adding suitable bismuth
The quantity and Oxygen potential of ink, the inovulant in the present invention also have good pregnant effect in the case where addition is few.The present invention
In heat treatment process, heating-up temperature, soaking time, cooldown rate and mode are rationally set, make the strong of ferritic spheroidal graphite casting
Degree and toughness are greatly improved.Ferrite ductile cast iron Oxygen potential in the present invention is high, has higher intensity and excellent
Toughness and impact plasticity, preparation method is simply efficient.
Embodiment
The technical solution of the present invention is further illustrated with reference to specific embodiment, embodiment is not to be construed as pair
The limitation of technical solution.
Embodiment 1：
A kind of ferrite ductile cast iron, the mass percent of each element component is in the ferrite ductile cast iron：Carbon
3.6%, silicon 2.5%, manganese 0.32%, cerium 0.035%, magnesium 0.05%, yttrium 0.09%, molybdenum 0.015%, rhenium 0.025%, phosphorus≤
0.04%, sulphur≤0.018%, surplus is iron.
The preparation method of ferrite ductile cast iron, specifically includes following steps：
(1) low-phosphorous, low-sulfur high duty pig iron and steel scrap are melted with medium-frequency induction furnace at 1450 DEG C, it is all molten
The content of each element in molten iron is detected after change, and adjusts each element content to recipe requirements are met, then carries out desulfurization process；
(2) by the magnesium-rare earth of the silicon carbide powder of molten iron gross weight 0.45% and molten iron gross weight 1.3%, (granularity is
1.5mm) pour into after mixing in nodularization bag, consolidation, above uniform fold molten iron gross weight 0.4% inovulant, pour iron
3/4ths of water inventory, after completing spheroidising and first time inoculation, pour a quarter of molten iron total amount, by molten iron
The inovulant of gross weight 0.4% is poured with stream, completes second of inoculation, cast, obtains casting；
(3) casting is heated to 900 DEG C, keeps the temperature 4h, be cooled to 600 DEG C with the speed of 10 DEG C/min, then be air-cooled to
Room temperature；Casting after will be air-cooled is heated to 700 DEG C, keeps the temperature 5h, is cooled to 600 DEG C with the speed of 2 DEG C/min, then be air-cooled to room
Temperature, obtains the ferrite ductile cast iron.
The weight ratio of the pig iron and steel scrap is 8:3.
The mass percent of each element component is in the inovulant：Silicon 50%, calcium 2%, barium 0.7%, manganese 2%, molybdenum
0.2%, rhenium 0.3%, surplus is iron.
Embodiment 2：
A kind of ferrite ductile cast iron, the mass percent of each element component is in the ferrite ductile cast iron：Carbon
3.8%, silicon 2.4%, manganese 0.35%, cerium 0.03%, magnesium 0.045%, yttrium 0.08%, molybdenum 0.02%, rhenium 0.02%, phosphorus≤
0.04%, sulphur≤0.018%, surplus is iron.
The preparation method of ferrite ductile cast iron, specifically includes following steps：
(1) low-phosphorous, low-sulfur high duty pig iron and steel scrap are melted with medium-frequency induction furnace at 1480 DEG C, it is all molten
The content of each element in molten iron is detected after change, and adjusts each element content to recipe requirements are met, then carries out desulfurization process；
(2) by the magnesium-rare earth of the silicon carbide powder of molten iron gross weight 0.35% and molten iron gross weight 1.5%, (granularity is
0.5mm) pour into after mixing in nodularization bag, consolidation, above uniform fold molten iron gross weight 0.6% inovulant, pour iron
3/4ths of water inventory, after completing spheroidising and first time inoculation, pour a quarter of molten iron total amount, by molten iron
The inovulant of gross weight 0.2% is poured with stream, completes second of inoculation, cast, obtains casting；
(3) casting is heated to 950 DEG C, keeps the temperature 2h, be cooled to 550 DEG C with the speed of 12 DEG C/min, then be air-cooled to
Room temperature；Casting after will be air-cooled is heated to 750 DEG C, keeps the temperature 3h, is cooled to 550 DEG C with the speed of 4 DEG C/min, then be air-cooled to room
Temperature, obtains the ferrite ductile cast iron.
The weight ratio of the pig iron and steel scrap is 9:2.
The mass percent of each element component is in the inovulant：Silicon 40%, calcium 2.5%, barium 0.4%, manganese 3%, molybdenum
0.1%, rhenium 0.5%, surplus is iron.
Embodiment 3：
A kind of ferrite ductile cast iron, the mass percent of each element component is in the ferrite ductile cast iron：Carbon
3.5%, silicon 2.7%, manganese 0.29%, cerium 0.04%, magnesium 0.045%, yttrium 0.1%, molybdenum 0.01%, rhenium 0.03%, phosphorus≤
0.04%, sulphur≤0.018%, surplus is iron.
The preparation method of ferrite ductile cast iron, specifically includes following steps：
(1) low-phosphorous, low-sulfur high duty pig iron and steel scrap are melted with medium-frequency induction furnace at 1460 DEG C, it is all molten
The content of each element in molten iron is detected after change, and adjusts each element content to recipe requirements are met, then carries out desulfurization process；
(2) by the magnesium-rare earth of the silicon carbide powder of molten iron gross weight 0.4% and molten iron gross weight 1.4%, (granularity is
1mm) pour into after mixing in nodularization bag, consolidation, above uniform fold molten iron gross weight 0.5% inovulant, pour molten iron
3/4ths of total amount, after completing spheroidising and first time inoculation, pour a quarter of molten iron total amount, and molten iron is total
The inovulant of weight 0.3% is poured with stream, completes second of inoculation, cast, obtains casting；
(3) casting is heated to 950 DEG C, keeps the temperature 3h, be cooled to 580 DEG C with the speed of 12 DEG C/min, then be air-cooled to
Room temperature；Casting after will be air-cooled is heated to 750 DEG C, keeps the temperature 3h, is cooled to 580 DEG C with the speed of 3 DEG C/min, then be air-cooled to room
Temperature, obtains the ferrite ductile cast iron.
The weight ratio of the pig iron and steel scrap is 9:3.
The mass percent of each element component is in the inovulant：Silicon 45%, calcium 2%, barium 0.6%, manganese 2.5%, molybdenum
0.15%, rhenium 0.4%, surplus is iron.
Embodiment 4：
A kind of ferrite ductile cast iron, the mass percent of each element component is in the ferrite ductile cast iron：Carbon
3.8%, silicon 2.7%, manganese 0.29%, cerium 0.03%, magnesium 0.06%, yttrium 0.08%, molybdenum 0.02%, rhenium 0.02%, phosphorus≤
0.04%, sulphur≤0.018%, surplus is iron.
The preparation method of ferrite ductile cast iron, specifically includes following steps：
(1) low-phosphorous, low-sulfur high duty pig iron and steel scrap are melted with medium-frequency induction furnace at 1480 DEG C, it is all molten
The content of each element in molten iron is detected after change, and adjusts each element content to recipe requirements are met, then carries out desulfurization process；
(2) by the magnesium-rare earth of the silicon carbide powder of molten iron gross weight 0.35% and molten iron gross weight 1.5%, (granularity is
0.5mm) pour into after mixing in nodularization bag, consolidation, above uniform fold molten iron gross weight 0.6% inovulant, pour iron
3/4ths of water inventory, after completing spheroidising and first time inoculation, pour a quarter of molten iron total amount, by molten iron
The inovulant of gross weight 0.4% is poured with stream, completes second of inoculation, cast, obtains casting；
(3) casting is heated to 900 DEG C, keeps the temperature 4h, be cooled to 600 DEG C with the speed of 11 DEG C/min, then be air-cooled to
Room temperature；Casting after will be air-cooled is heated to 700 DEG C, keeps the temperature 5h, is cooled to 600 DEG C with the speed of 3 DEG C/min, then be air-cooled to room
Temperature, obtains the ferrite ductile cast iron.
The weight ratio of the pig iron and steel scrap is 8:2.
The mass percent of each element component is in the inovulant：Silicon 50%, calcium 2.5%, barium 0.4%, manganese 2%, molybdenum
0.2%, rhenium 0.5%, surplus is iron.
Embodiment 5：
A kind of ferrite ductile cast iron, the mass percent of each element component is in the ferrite ductile cast iron：Carbon
3.7%, silicon 2.5%, manganese 0.33%, cerium 0.03%, magnesium 0.055%, yttrium 0.1%, molybdenum 0.01%, rhenium 0.025%, phosphorus≤
0.04%, sulphur≤0.018%, surplus is iron.
The preparation method of ferrite ductile cast iron, specifically includes following steps：
(1) low-phosphorous, low-sulfur high duty pig iron and steel scrap are melted with medium-frequency induction furnace at 1450 DEG C, it is all molten
The content of each element in molten iron is detected after change, and adjusts each element content to recipe requirements are met, then carries out desulfurization process；
(2) by the magnesium-rare earth of the silicon carbide powder of molten iron gross weight 0.35% and molten iron gross weight 1.3%, (granularity is
1.5mm) pour into after mixing in nodularization bag, consolidation, above uniform fold molten iron gross weight 0.4% inovulant, pour iron
3/4ths of water inventory, after completing spheroidising and first time inoculation, pour a quarter of molten iron total amount, by molten iron
The inovulant of gross weight 0.2% is poured with stream, completes second of inoculation, cast, obtains casting；
(3) casting is heated to 950 DEG C, keeps the temperature 2h, be cooled to 550 DEG C with the speed of 12 DEG C/min, then be air-cooled to
Room temperature；Casting after will be air-cooled is heated to 750 DEG C, keeps the temperature 4h, is cooled to 560 DEG C with the speed of 2.5 DEG C/min, then be air-cooled to room
Temperature, obtains the ferrite ductile cast iron.
The weight ratio of the pig iron and steel scrap is 8:3.
The mass percent of each element component is in the inovulant：Silicon 40%, calcium 2%, barium 0.7%, manganese 3%, molybdenum
0.1%, rhenium 0.3%, surplus is iron.
Performance test：To being tested for the property as the ferrite ductile cast iron obtained by embodiment 1-5, test result such as table
Shown in 1：
The performance test results of 1 ferrite ductile cast iron of table
From the test result of table 1, the ferrite ductile cast iron Oxygen potential in the present invention is high, have higher intensity and
Excellent toughness and impact plasticity.
Claims (6)
- A kind of 1. preparation method of ferrite ductile cast iron, it is characterised in that each element component in the ferrite ductile cast iron Mass percent be：Carbon 3.5%-3.8%, silicon 2.4%-2.7%, manganese 0.29%-0.35%, cerium 0.03%-0.04%, magnesium 0.045%-0.06%, yttrium 0.08%-0.1%, molybdenum 0.01%-0.02%, rhenium 0.02%-0.03%, phosphorus≤0.04%, sulphur≤ 0.018%, surplus is iron；Its preparation method specifically includes following steps：(1) low-phosphorous, low-sulfur high duty pig iron and steel scrap are melted with medium-frequency induction furnace at 1450-1480 DEG C, all The content of each element in molten iron is detected after fusing, and adjusts each element content to recipe requirements are met, then carries out desulfurization process；(2) magnesium-rare earth of silicon carbide powder and molten iron gross weight 1.3%-1.5% are poured into nodularization bag after mixing, Consolidation, above uniform fold molten iron gross weight 0.4%-0.6% inovulant, pour 3/4ths of molten iron total amount, complete ball After changing processing and first time inoculation, a quarter of molten iron total amount is poured, by breeding for molten iron gross weight 0.2%-0.4% Agent is poured with stream, completes second of inoculation, cast, obtains casting；(3) casting is heated to 900-950 DEG C, keeps the temperature 2-4h, 550-600 DEG C is cooled to the speed of 10-12 DEG C/min, Room temperature is air-cooled to again；Casting after will be air-cooled is heated to 700-750 DEG C, keeps the temperature 1-2h, is cooled to the speed of 2-4 DEG C/min 550-600 DEG C, then room temperature is air-cooled to, obtain the ferrite ductile cast iron.
- 2. the preparation method of ferrite ductile cast iron according to claim 1, it is characterised in that the ferritic spheroidal graphite casting The mass percent of each element component is in iron：Carbon 3.6%, silicon 2.5%, manganese 0.32%, cerium 0.035%, magnesium 0.05%, yttrium 0.09%, molybdenum 0.015%, rhenium 0.025%, phosphorus≤0.04%, sulphur≤0.018%, surplus is iron.
- 3. the preparation method of ferrite ductile cast iron according to claim 1, it is characterised in that the pig iron and steel scrap Weight ratio is 8-9:2-3.
- 4. the preparation method of ferrite ductile cast iron according to claim 1, it is characterised in that the addition of the carborundum Measure as the 0.35%-0.45% of molten iron gross weight.
- 5. the preparation method of ferrite ductile cast iron according to claim 1, it is characterised in that the magnesium-rare earth Granularity is 0.5-1.5mm.
- 6. the preparation method of ferrite ductile cast iron according to claim 1, it is characterised in that each member in the inovulant The mass percent of plain component is：Silicon 40%-50%, calcium 2%-2.5%, barium 0.4%-0.7%, manganese 2%-3%, molybdenum 0.1%- 0.2%, rhenium 0.3%-0.5%, surplus is iron.
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| CN108441752A (en) * | 2018-06-04 | 2018-08-24 | 含山县兴达球墨铸铁厂 | A kind of automobile brake disc spheroidal graphite cast-iron and preparation method thereof |
| CN108642370A (en) * | 2018-06-06 | 2018-10-12 | 含山县东山德雨球墨铸造厂 | A kind of antioxidant wear-resistant spheroidal graphite cast-iron and preparation method thereof |
| CN109136446A (en) * | 2018-08-01 | 2019-01-04 | 安徽信息工程学院 | A kind of refining spheroidal graphite cast-iron and preparation method thereof |
| CN109852874A (en) * | 2019-04-12 | 2019-06-07 | 荆州市巨鲸传动机械有限公司 | A kind of preparation method of optimizing components type QT600-3 spheroidal graphite cast-iron |
| CN110052589B (en) * | 2019-04-28 | 2021-11-09 | 河北恒工精密装备股份有限公司 | Isostatic pressing heat preservation furnace and method for horizontal continuous casting of nodular cast iron section |
| CN110157975B (en) * | 2019-06-28 | 2021-03-19 | 含山县兴达球墨铸铁厂 | Preparation method of high-strength thin-wall gray iron casting |
| CN114411048B (en) * | 2022-01-24 | 2022-09-23 | 襄阳金耐特机械股份有限公司 | As-cast ferrite nodular iron casting |
| CN114561523A (en) * | 2022-03-10 | 2022-05-31 | 锦州捷通铁路机械股份有限公司 | Method for controlling micro shrinkage porosity of nodular cast iron |
| CN115094300A (en) * | 2022-05-27 | 2022-09-23 | 刘锐 | Ferritic nodular cast iron and preparation method thereof |
| CN115125433A (en) * | 2022-06-27 | 2022-09-30 | 江苏天奇重工股份有限公司 | High-toughness ferritic nodular cast iron and preparation method thereof |
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| CN1022421C (en) * | 1989-04-26 | 1993-10-13 | 山东工业大学 | Process for casting nodular graphite cast iron with as-cast ferrite by metal mould |
| CN1900340A (en) * | 2006-07-21 | 2007-01-24 | 中国重型汽车集团有限公司 | Cast state high strength high extensibility nodular cast iron material |
| CN101497956B (en) * | 2009-03-09 | 2010-09-29 | 江苏一汽铸造股份有限公司 | Big section ferrite magnesium iron and preparation technique thereof |
| CN104480380B (en) * | 2015-01-23 | 2016-06-29 | 四川省川建管道有限公司 | A kind of moulding process being applicable to prepare water-cooling metal centrifugal ductile iron pipe |
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