CN105861915A - Ferritic spheroidal graphite cast iron and preparation method thereof - Google Patents
Ferritic spheroidal graphite cast iron and preparation method thereof Download PDFInfo
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- CN105861915A CN105861915A CN201610496177.4A CN201610496177A CN105861915A CN 105861915 A CN105861915 A CN 105861915A CN 201610496177 A CN201610496177 A CN 201610496177A CN 105861915 A CN105861915 A CN 105861915A
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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
Abstract
The invention relates to the field of spheroidal graphite cast iron, in particular to ferritic spheroidal graphite cast iron and a preparation method thereof. The ferritic spheroidal graphite cast iron comprises, by mass, 3.5%-3.8% of carbon, 2.4%-2.7% of silicon, 0.29%-0.35% of manganese, 0.03%-0.04% of cerium, 0.045%-0.06% of magnesium, 0.08%-0.1% of yttrium, 0.01%-0.02% of molybdenum, 0.02%-0.03% of rhenium, not more than 0.04% of phosphorus, not more than 0.018% of sulphur and the balance iron. The preparation method particularly includes the steps of (1), melting raw materials by a medium-frequency induction furnace prior to desulfurization; (2), uniformly mixing silicon carbide powder with rare earth magnesium alloy, then pouring the mixture into a spheroidizing package, covering the spheroidizing package with a first inoculant for spheroidizing and primary inoculation treatment prior to secondary inoculation treatment, and casting so as to obtain a cast; (3), subjecting the cast to heat treatment so as to obtain the ferritic spheroidal graphite cast iron. The ferritic spheroidal graphite cast iron is high in spheroidizing ratio and strength and excellent in toughness and impact plasticity, and the preparation method is simple and efficient.
Description
Technical field
The present invention relates to spheroidal graphite cast-iron field, be specifically related to a kind of ferrite ductile cast iron and
Preparation method.
Background technology
China's spheroidal graphite cast-iron produces starting very early, and nineteen fifty just succeeds in developing and puts into production,
So far China's spheroidal graphite cast-iron annual production reaches 2,300,000 tons, after being positioned at the U.S., Japan, occupies generation
The 3rd, boundary.Succeeding in developing of the rare earth magnesium nodularizer of applicable China's national situation, as cast condition spheroidal graphite is cast
Production technology and the research work of the every field such as ferrum and Austenite-Bainite Ductile Iron are equal
Reach the highest technical merit.Ferrite ductile cast iron refers to that in matrix, ferrite content is more than
80%, the remaining spheroidal graphite cast-iron for pearlite, has good impact plasticity and toughness, but by force
Spend relatively low.It relatively greatly and bears vibrations and the part of impact, great Liang Yong for manufacturing stress
In departments such as automobile, agricultural machinery, boats and ships, metallurgy, chemical industry, become important cast iron materials.
Affect the principal element of ferrite ductile cast iron plasticity be chemical composition, graphite nodule big
Little and shape, the free cementite of residual and field trash phase, ferritic grain size etc..In
State's patent CN 103060671 A discloses one " ferrite ductile cast iron and preparation side thereof
Method ", this invention, by selecting the raw material of high-quality, adjusts carbon, silicon, the content of manganese in molten iron,
Molten iron processes through deoxidizing purification, pretreatment, spheroidization and inoculation, it is thus achieved that high-intensity high-tenacity ferrum element
Body spheroidal graphite cast-iron, but intensity and toughness for described ferritic spheroidal graphite foundry goods can also be done
Further improve.
Summary of the invention
The invention provides a kind of ferrite ductile cast iron and preparation method thereof, described ferrite
Spheroidal graphite cast-iron has toughness and the impact plasticity of higher intensity and excellence, and preparation method letter
Single efficient.
For realizing object above, the present invention is achieved by the following technical programs:
A kind of ferrite ductile cast iron, the matter of each elemental composition in described ferrite ductile cast iron
Amount percentage ratio is: 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%, sulfur≤0.018%, surplus is ferrum.
Preferably, in described ferrite ductile cast iron, the mass percent of each elemental composition is:
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%, sulfur≤0.018%, surplus is ferrum.
The preparation method of ferrite ductile cast iron, specifically includes following steps:
(1) by the high duty pig iron of low-phosphorous, low-sulfur with steel scrap medium-frequency induction furnace at 1450-
Melt at 1480 DEG C, all detect the content of each element in molten iron after fusing, and adjust
Each constituent content, to meeting recipe requirements, carries out desulfurization process subsequently；
(2) magnesium-rare earth of silicon carbide powder with molten iron gross weight 1.3%-1.5% is mixed
Pour in nodularization bag after Jun Yun, consolidation, above uniform fold molten iron gross weight 0.4%-0.6%
Inovulant, pour 3/4ths of molten iron total amount, complete spheroidising and breed for the first time
After process, pour 1/4th of molten iron total amount, pregnant by molten iron gross weight 0.2%-0.4%
Educate agent to pour with stream, complete second time inoculation, cast, obtain foundry goods；
(3) described foundry goods is heated to 900-950 DEG C, is incubated 2-4h, with 10-12 DEG C/min
Speed be cooled to 550-600 DEG C, then air cooling is to room temperature；Foundry goods after air cooling is heated to
700-750 DEG C, it is incubated 3-5h, is cooled to 550-600 DEG C with the speed of 2-4 DEG C/min, more empty
It is cooled to room temperature, obtains described ferrite ductile cast iron.
Preferably, the weight ratio of the described pig iron and steel scrap is 8-9:2-3.
Preferably, in described step (2), the addition of carborundum is molten iron gross weight
0.35%-0.45%.
Preferably, the granularity of described magnesium-rare earth is 0.5-1.5mm.
Preferably, in described inovulant, the mass percent of each elemental composition 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 ferrum.
The invention have the benefit that the present invention makes after carborundum and nodulizer being sufficiently mixed
With, both synergism, number of graphite ball and ferrite content can be dramatically increased, to improving ball
Rate, minimizing dendrite, reduction shrinkage porosite generation tendency have good effect.Inovulant adds
Entering molybdenum and rhenium, can improve intensity and the plasticity of spheroidal graphite cast-iron, adding appropriate bismuth can increase
Add quantity and the Oxygen potential of spheroidal graphite, the inovulant in the present invention in the case of addition is few also
There is good pregnant effect.The present invention in heat treatment process, rationally arrange heating-up temperature,
Temperature retention time, cooldown rate and mode, make the intensity of ferritic spheroidal graphite foundry goods and toughness have
The biggest raising.Ferrite ductile cast iron Oxygen potential in the present invention is high, has higher strong
The toughness of degree and excellence and impact plasticity, preparation method is the most efficient.
Detailed description of the invention
Further illustrate the technical solution of the present invention below in conjunction with specific embodiment, implement
Example is not to be construed as the restriction to technical solution.
Embodiment 1:
A kind of ferrite ductile cast iron, the matter of each elemental composition in described ferrite ductile cast iron
Amount percentage ratio is: 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%, sulfur≤0.018%, surplus is
Ferrum.
The preparation method of ferrite ductile cast iron, specifically includes following steps:
(1) by the high duty pig iron of low-phosphorous, low-sulfur with steel scrap medium-frequency induction furnace at 1450 DEG C
Under melt, all detect the content of each element in molten iron after fusing, and adjust each element
Content, to meeting recipe requirements, carries out desulfurization process subsequently；
(2) by the silicon carbide powder of molten iron gross weight 0.45% and molten iron gross weight 1.3%
Pour in nodularization bag after magnesium-rare earth (granularity is 1.5mm) mix homogeneously, consolidation, on
The inovulant of face uniform fold molten iron gross weight 0.4%, pours 3/4ths of molten iron total amount,
After completing spheroidising and first time inoculation, pour 1/4th of molten iron total amount, will
The inovulant of molten iron gross weight 0.4% pours with stream, completes second time inoculation, pours into a mould,
Obtain foundry goods；
(3) described foundry goods is heated to 900 DEG C, is incubated 4h, with the speed of 10 DEG C/min
It is cooled to 600 DEG C, then air cooling is to room temperature；Foundry goods after air cooling is heated to 700 DEG C, insulation
5h, is cooled to 600 DEG C with the speed of 2 DEG C/min, then air cooling is to room temperature, obtains described ferrite
Spheroidal graphite cast-iron.
The weight ratio of the described pig iron and steel scrap is 8:3.
In described inovulant, the mass percent of each elemental composition is: silicon 50%, calcium 2%,
Barium 0.7%, manganese 2%, molybdenum 0.2%, rhenium 0.3%, surplus is ferrum.
Embodiment 2:
A kind of ferrite ductile cast iron, the matter of each elemental composition in described ferrite ductile cast iron
Amount percentage ratio is: 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%, sulfur≤0.018%, surplus is ferrum.
The preparation method of ferrite ductile cast iron, specifically includes following steps:
(1) by the high duty pig iron of low-phosphorous, low-sulfur with steel scrap medium-frequency induction furnace at 1480 DEG C
Under melt, all detect the content of each element in molten iron after fusing, and adjust each element
Content, to meeting recipe requirements, carries out desulfurization process subsequently；
(2) by the silicon carbide powder of molten iron gross weight 0.35% and molten iron gross weight 1.5%
Pour in nodularization bag after magnesium-rare earth (granularity is 0.5mm) mix homogeneously, consolidation, on
The inovulant of face uniform fold molten iron gross weight 0.6%, pours 3/4ths of molten iron total amount,
After completing spheroidising and first time inoculation, pour 1/4th of molten iron total amount, will
The inovulant of molten iron gross weight 0.2% pours with stream, completes second time inoculation, pours into a mould,
Obtain foundry goods；
(3) described foundry goods is heated to 950 DEG C, is incubated 2h, with the speed of 12 DEG C/min
It is cooled to 550 DEG C, then air cooling is to room temperature；Foundry goods after air cooling is heated to 750 DEG C, insulation
3h, is cooled to 550 DEG C with the speed of 4 DEG C/min, then air cooling is to room temperature, obtains described ferrite
Spheroidal graphite cast-iron.
The weight ratio of the described pig iron and steel scrap is 9:2.
In described inovulant, the mass percent of each elemental composition is: silicon 40%, calcium 2.5%,
Barium 0.4%, manganese 3%, molybdenum 0.1%, rhenium 0.5%, surplus is ferrum.
Embodiment 3:
A kind of ferrite ductile cast iron, the matter of each elemental composition in described ferrite ductile cast iron
Amount percentage ratio is: 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%, sulfur≤0.018%, surplus is ferrum.
The preparation method of ferrite ductile cast iron, specifically includes following steps:
(1) by the high duty pig iron of low-phosphorous, low-sulfur with steel scrap medium-frequency induction furnace at 1460 DEG C
Under melt, all detect the content of each element in molten iron after fusing, and adjust each element
Content, to meeting recipe requirements, carries out desulfurization process subsequently；
(2) dilute by the silicon carbide powder of molten iron gross weight 0.4% and molten iron gross weight 1.4%
Pour in nodularization bag after soil magnesium alloy (granularity is 1mm) mix homogeneously, consolidation, above all
The inovulant of even covering molten iron gross weight 0.5%, pours 3/4ths of molten iron total amount, completes
After spheroidising and for the first time inoculation, pour 1/4th of molten iron total amount, by molten iron
The inovulant of gross weight 0.3% pours with stream, completes second time inoculation, cast, obtains casting
Part；
(3) described foundry goods is heated to 950 DEG C, is incubated 3h, with the speed of 12 DEG C/min
It is cooled to 580 DEG C, then air cooling is to room temperature；Foundry goods after air cooling is heated to 750 DEG C, insulation
3h, is cooled to 580 DEG C with the speed of 3 DEG C/min, then air cooling is to room temperature, obtains described ferrite
Spheroidal graphite cast-iron.
The weight ratio of the described pig iron and steel scrap is 9:3.
In described inovulant, the mass percent of each elemental composition is: silicon 45%, calcium 2%,
Barium 0.6%, manganese 2.5%, molybdenum 0.15%, rhenium 0.4%, surplus is ferrum.
Embodiment 4:
A kind of ferrite ductile cast iron, the matter of each elemental composition in described ferrite ductile cast iron
Amount percentage ratio is: 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%, sulfur≤0.018%, surplus is ferrum.
The preparation method of ferrite ductile cast iron, specifically includes following steps:
(1) by the high duty pig iron of low-phosphorous, low-sulfur with steel scrap medium-frequency induction furnace at 1480 DEG C
Under melt, all detect the content of each element in molten iron after fusing, and adjust each element
Content, to meeting recipe requirements, carries out desulfurization process subsequently；
(2) by the silicon carbide powder of molten iron gross weight 0.35% and molten iron gross weight 1.5%
Pour in nodularization bag after magnesium-rare earth (granularity is 0.5mm) mix homogeneously, consolidation, on
The inovulant of face uniform fold molten iron gross weight 0.6%, pours 3/4ths of molten iron total amount,
After completing spheroidising and first time inoculation, pour 1/4th of molten iron total amount, will
The inovulant of molten iron gross weight 0.4% pours with stream, completes second time inoculation, pours into a mould,
Obtain foundry goods；
(3) described foundry goods is heated to 900 DEG C, is incubated 4h, with the speed of 11 DEG C/min
It is cooled to 600 DEG C, then air cooling is to room temperature；Foundry goods after air cooling is heated to 700 DEG C, insulation
5h, is cooled to 600 DEG C with the speed of 3 DEG C/min, then air cooling is to room temperature, obtains described ferrite
Spheroidal graphite cast-iron.
The weight ratio of the described pig iron and steel scrap is 8:2.
In described inovulant, the mass percent of each elemental composition is: silicon 50%, calcium 2.5%,
Barium 0.4%, manganese 2%, molybdenum 0.2%, rhenium 0.5%, surplus is ferrum.
Embodiment 5:
A kind of ferrite ductile cast iron, the matter of each elemental composition in described ferrite ductile cast iron
Amount percentage ratio is: 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%, sulfur≤0.018%, surplus is ferrum.
The preparation method of ferrite ductile cast iron, specifically includes following steps:
(1) by the high duty pig iron of low-phosphorous, low-sulfur with steel scrap medium-frequency induction furnace at 1450 DEG C
Under melt, all detect the content of each element in molten iron after fusing, and adjust each element
Content, to meeting recipe requirements, carries out desulfurization process subsequently；
(2) by the silicon carbide powder of molten iron gross weight 0.35% and molten iron gross weight 1.3%
Pour in nodularization bag after magnesium-rare earth (granularity is 1.5mm) mix homogeneously, consolidation, on
The inovulant of face uniform fold molten iron gross weight 0.4%, pours 3/4ths of molten iron total amount,
After completing spheroidising and first time inoculation, pour 1/4th of molten iron total amount, will
The inovulant of molten iron gross weight 0.2% pours with stream, completes second time inoculation, pours into a mould,
Obtain foundry goods；
(3) described foundry goods is heated to 950 DEG C, is incubated 2h, with the speed of 12 DEG C/min
It is cooled to 550 DEG C, then air cooling is to room temperature；Foundry goods after air cooling is heated to 750 DEG C, insulation
4h, is cooled to 560 DEG C with the speed of 2.5 DEG C/min, then air cooling is to room temperature, obtains described ferrum element
Body spheroidal graphite cast-iron.
The weight ratio of the described pig iron and steel scrap is 8:3.
In described inovulant, the mass percent of each elemental composition is: silicon 40%, calcium 2%,
Barium 0.7%, manganese 3%, molybdenum 0.1%, rhenium 0.3%, surplus is ferrum.
Performance test: carry out performance to by the ferrite ductile cast iron obtained by embodiment 1-5
Test, test result is as shown in table 1:
The performance test results of table 1 ferrite ductile cast iron
From the test result of table 1, the ferrite ductile cast iron Oxygen potential in the present invention is high,
There is toughness and the impact plasticity of higher intensity and excellence.
Claims (7)
1. a ferrite ductile cast iron, it is characterised in that in described ferrite ductile cast iron
The mass percent of each elemental composition is: 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%, sulfur≤0.018%, surplus is
Ferrum.
Ferrite ductile cast iron the most according to claim 1, it is characterised in that described
In ferrite ductile cast iron, the mass percent of each elemental composition is: 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%, sulfur≤0.018%, surplus is ferrum.
The preparation method of ferrite ductile cast iron the most according to claim 1 and 2, its
It is characterised by, specifically includes following steps:
(1) by the high duty pig iron of low-phosphorous, low-sulfur with steel scrap medium-frequency induction furnace at 1450-
Melt at 1480 DEG C, all detect the content of each element in molten iron after fusing, and adjust
Each constituent content, to meeting recipe requirements, carries out desulfurization process subsequently；
(2) magnesium-rare earth of silicon carbide powder with molten iron gross weight 1.3%-1.5% is mixed
Pour in nodularization bag after Jun Yun, consolidation, above uniform fold molten iron gross weight 0.4%-0.6%
Inovulant, pour 3/4ths of molten iron total amount, complete spheroidising and breed for the first time
After process, pour 1/4th of molten iron total amount, pregnant by molten iron gross weight 0.2%-0.4%
Educate agent to pour with stream, complete second time inoculation, cast, obtain foundry goods；
(3) described foundry goods is heated to 900-950 DEG C, is incubated 2-4h, with 10-12 DEG C/min
Speed be cooled to 550-600 DEG C, then air cooling is to room temperature；Foundry goods after air cooling is heated to
700-750 DEG C, it is incubated 1-2h, is cooled to 550-600 DEG C with the speed of 2-4 DEG C/min, more empty
It is cooled to room temperature, obtains described ferrite ductile cast iron.
The preparation method of ferrite ductile cast iron the most according to claim 3, its feature
Being, the weight ratio of the described pig iron and steel scrap is 8-9:2-3.
The preparation method of ferrite ductile cast iron the most according to claim 3, its feature
Being, the addition of described carborundum is the 0.35%-0.45% of molten iron gross weight.
The preparation method of ferrite ductile cast iron the most according to claim 3, its feature
Being, the granularity of described middle rare earth magnesium alloy is 0.5-1.5mm.
The preparation method of ferrite ductile cast iron the most according to claim 3, its feature
Being, in described inovulant, the mass percent of each elemental composition 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 ferrum.
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Cited By (10)
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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 |
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| 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 |
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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 |
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| 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 |
| CN114411048A (en) * | 2022-01-24 | 2022-04-29 | 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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Denomination of invention: Preparation method of ferrite nodular cast iron Effective date of registration: 20191216 Granted publication date: 20180424 Pledgee: Hanshan Tongda Financing Guarantee Co., Ltd Pledgor: Spheroidal graphite cast-iron factory of Hanshan County Xingda Registration number: Y2019980001069 |
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Date of cancellation: 20211227 Granted publication date: 20180424 Pledgee: Hanshan Tongda Financing Guarantee Co.,Ltd. Pledgor: HANSHAN COUNTY XINGDA DUCTILE IRON FACTORY Registration number: Y2019980001069 |