CN106244911B - Automobile steering device shell solution strengthening ferrite ductile cast iron and its production method - Google Patents
Automobile steering device shell solution strengthening ferrite ductile cast iron and its production method Download PDFInfo
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- CN106244911B CN106244911B CN201610755473.1A CN201610755473A CN106244911B CN 106244911 B CN106244911 B CN 106244911B CN 201610755473 A CN201610755473 A CN 201610755473A CN 106244911 B CN106244911 B CN 106244911B
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- Prior art keywords
- solution strengthening
- iron
- automobile steering
- steering device
- device shell
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Classifications
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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
-
- 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
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
- C22C33/12—Making cast-iron alloys including procedures for adding magnesium by fluidised injection
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Abstract
The invention discloses a kind of automobile steering device shell solution strengthening ferrite ductile cast irons, its chemical composition is by weight percentage are as follows: carbon C 3.10~3.50%, silicon Si 3.20~3.70%, manganese Mn≤0.50%, phosphorus P≤0.05%, sulphur S≤0.015%, rare earth RE≤0.03%, magnesium Mg0.03~0.06%, surplus are iron Fe.Its solution strengthening production method includes: the processes such as electro-smelting operation, original soup processing requirement, molten iron processing method, late inoculation, casting, molten iron obtains satisfactory automobile steering device shell solution strengthening ferrite ductile cast iron by programs such as mulling, coremaking, moulding, knockout, cleaning, inspection, protection, storages after casting.It does not need to add the pearlite alloy such as the metals such as copper, tin and manganese iron again in production process of the present invention, by using silicon solution strengthening ferrite, by being met the service performance of material and the needs of processing performance by the ferrite after solution strengthening, reach reduction production cost simultaneously, to meet the needs in market and enterprise.
Description
Technical field:
The present invention relates to a kind of production methods of spheroidal graphite cast-iron, strong with solid solution more particularly to a kind of automobile steering device shell
Change ferrite ductile cast iron and its solution strengthening production method.
Background technique:
With the development of Domestic Automotive Industry, automobile steering device shell, valve body piece want the comprehensive performance of spheroidal graphite cast-iron
It asks higher and higher, there is high-strength tenacity, good anti-fatigue performance, excellent machinability to have become domestic outdoor main unit
And the target that original equipment manufacturer is pursued.
Summary of the invention:
The technical problems to be solved by the present invention are: providing a kind of automobile steering device shell solution strengthening ferritic spheroidal graphite
Cast iron and its solution strengthening production method have overturned and traditional guaranteed content of pearlite in alloy by alloying and pass through content of pearlite in alloy
Percentage adjustment come meet different trade mark magnesium iron hardness and other mechanical properties material melting production technology, using silicon
Solution strengthening ferrite, by being met the service performance of material and the needs of processing performance by the ferrite after solution strengthening,
Reach reduction production cost simultaneously, to meet the needs in market and enterprise.
The present invention is adopted the technical scheme that in order to solve the technical problem:
A kind of automobile steering device shell solution strengthening ferrite ductile cast iron, chemical composition is by weight percentage
Are as follows: carbon C 3.10~3.50%, silicon Si3.20~3.70%, manganese Mn≤0.50%, phosphorus P≤0.05%, sulphur S≤0.015%, rare earth RE
≤ 0.03%, magnesium Mg0.03~0.06%, surplus is iron Fe；
The automobile steering device shell is in solution strengthening ferrite ductile cast iron:
Matrix is based on ferrite, cementite < 1%；
Ontology mechanical property: meet solution strengthening ferritic spheroidal graphite cast iron Europe DIN EN 1563--2012 standard.
Production method of the automobile steering device shell recited above with solution strengthening ferrite ductile cast iron, concrete technology
Process is as follows:
A, electro-smelting operation: original soup are melted using 5 tons or 6 tons of intermediate frequency furnaces, skims and takes at 1400 DEG C or more after melting down
Sample, refining temperature are 1500 DEG C ± 10 DEG C, quiescence in high temperature 5 minutes or more；
B, original soup requirement: original soup ingredient is qualified, temperature is qualified and can be discharged after net slag, tapping temperature >=1420 DEG C；
C, molten iron is handled:
1. nodulizer: nodulizer select FeSiMg6RE2,10~25mm of granularity, additional amount be iron liquid weight 1.0%~
1.2%；
2. briquetting inovulant: briquetting inovulant selects FeSi75,5~25mm of granularity, and additional amount is the 0.6 of iron liquid weight
~1.0%；
3. nodularization packet: nodularization packet requires internal diameter d to meet with packet depth h: d/h=1:1.8 or so, bottom are dam-type nodularization room,
After nodularization packet is built, using ladle dryer drying, dries thoroughly, scald packet to 600 DEG C or more with original soup using preceding；
4. spheroidising: carrying out spheroidising using the method that pours, charging order is nodulizer, briquetting inovulant, is then needed
It shakeouts and appropriate compacting, leaving water temperature >=1420 DEG C, spheroidizing reacion time is 50s~80s, nodularization terminates after needing net slag, covering
It transports again；
D, late inoculation:
Molten iron will carry out late inoculation when ladle-to-ladle, and post inoculant selects FeSi75, and 2~3mm of granularity, additional amount is iron
The 0.2% of water weight；Net slag, thermometric are needed before casting and spectrum sample is taken to verify final hot metal composition；
E, it casting process: is poured using production line automatic pouring machine；
1. the duration of pouring:
Each nodularization packet duration of pouring control exists: calculating, is no more than 10 minutes since water outlet；Terminate to calculate from nodularization,
No more than 8 minutes；
2. pouring temperature: the first temperature of pouring temperature is according to the size of product and structure control at 1370~1420 DEG C；Casting temperature
Last box temperature degree is spent according to the size and structure control of product at 1320~1350 DEG C；
3. current-following inoculation: using the FeSi75 current-following inoculation of 0.2~0.8 mm of granularity in casting process, additional amount is with stream
The 0.08% of weight of molten iron；
F, other:
Molten iron is met by programs such as mulling, coremaking, moulding, knockout, cleaning, inspection, protection, storages after casting
It is required that automobile steering device shell solution strengthening ferrite ductile cast iron.
The positive effect of the present invention is as follows:
1, it using production method of the invention, does not need to add the pearly-lustres such as the metals such as copper, tin and manganese iron again in production process
Body alloy, that is, can be mass-produced automobile steering device shell and valve body, and casting cost is effectively reduced.
2, ball is effectively reduced by controlling the chemical component and tapping temperature of original soup using production method of the invention
It is excessive to Shrinkage Porosity and segregation to effectively reduce Mg and RE residual while reducing casting cost for the additional amount of agent
Deng adverse effect.
3, the automobile steering device shell solution strengthening ferrite ductile cast iron that the present invention is produced, with traditional ball
Iron (QT450-10, QT500-7, QT600-3) compares: 50% or more elongation percentage raising, and hardness fluctuations amplitude reduction 50~
75%, yield tensile ratio is promoted from 0.55~0.65 to 0.72~0.82, and product mechanical property and anti-fatigue performance are stablized, processing performance
It is excellent, in the spheroidal graphite cast-iron production that can be widely used for automobile steering device shell and valve body.
4, the automobile steering device shell solution strengthening ferrite ductile cast iron that the present invention is produced, mechanical property are excellent
Good, performance fully meets solution strengthening ferritic spheroidal graphite cast iron Europe DIN EN 1563--2012 standard.
Specific embodiment:
It is next combined with specific embodiments below that the present invention will be further explained and explanation:
Embodiment 1: a kind of automobile steering device shell solution strengthening ferrite ductile cast iron, chemical composition is by weight
Measure percentage are as follows: carbon C 3.10%, silicon Si 3.70%, manganese Mn 0.50%, phosphorus P 0.05%, sulphur S 0.015%, rare earth RE 0.03%,
0.03 % of magnesium Mg, surplus are iron Fe；
The automobile steering device shell is in solution strengthening ferrite ductile cast iron:
Matrix is based on ferrite, cementite < 1%；
Ontology mechanical property: meet solution strengthening ferritic spheroidal graphite cast iron Europe DIN EN 1563--2012 standard.
Production method of the automobile steering device shell recited above with solution strengthening ferrite ductile cast iron, concrete technology
Process is as follows:
A, electro-smelting operation: original soup are melted using 5 tons or 6 tons of intermediate frequency furnaces, skims and takes at 1400 DEG C or more after melting down
Sample, refining temperature are 1500 DEG C ± 10 DEG C, quiescence in high temperature 5 minutes or more；
B, original soup requirement: original soup ingredient is qualified, temperature is qualified and can be discharged after net slag, tapping temperature >=1420 DEG C；
C, molten iron is handled:
1. nodulizer: nodulizer select FeSiMg6RE2,10~25mm of granularity, additional amount be iron liquid weight 1.0%~
1.2%；
2. briquetting inovulant: briquetting inovulant selects FeSi75,5~25mm of granularity, and additional amount is the 0.6 of iron liquid weight
~1.0%；
3. nodularization packet: nodularization packet requires internal diameter d to meet with packet depth h: d/h=1:1.8 or so, bottom are dam-type nodularization room,
After nodularization packet is built, using ladle dryer drying, dries thoroughly, scald packet to 600 DEG C or more with original soup using preceding；
4. spheroidising: carrying out spheroidising using the method that pours, charging order is nodulizer, briquetting inovulant, is then needed
It shakeouts and appropriate compacting, leaving water temperature >=1420 DEG C, spheroidizing reacion time is 50s~80s, nodularization terminates after needing net slag, covering
It transports again；
D, late inoculation:
Molten iron will carry out late inoculation when ladle-to-ladle, and post inoculant selects FeSi75, and 2~3mm of granularity, additional amount is iron
The 0.2% of water weight；Net slag, thermometric are needed before casting and spectrum sample is taken to verify final hot metal composition；
E, it casting process: is poured using production line automatic pouring machine；
1. the duration of pouring:
Each nodularization packet duration of pouring control exists: calculating, is no more than 10 minutes since water outlet；Terminate to calculate from nodularization,
No more than 8 minutes；
2. pouring temperature: the first temperature of pouring temperature is according to the size of product and structure control at 1370~1420 DEG C；Casting temperature
Last box temperature degree is spent according to the size and structure control of product at 1320~1350 DEG C；
3. current-following inoculation: using the FeSi75 current-following inoculation of 0.2~0.8 mm of granularity in casting process, additional amount is with stream
The 0.08% of weight of molten iron；
F, other:
Molten iron is met by programs such as mulling, coremaking, moulding, knockout, cleaning, inspection, protection, storages after casting
It is required that automobile steering device shell solution strengthening ferrite ductile cast iron.
Embodiment 2: the production method and embodiment 1 of the present embodiment are essentially identical, and the same thing is not repeated, and difference exists
In: a kind of automobile steering device shell solution strengthening ferrite ductile cast iron, chemical composition is by weight percentage are as follows: carbon
C 3.50%, silicon Si 3.20%, manganese Mn 0.20%, phosphorus P 0.03%, sulphur S 0.010%, rare earth RE 0.01%, magnesium Mg 0.06% are remaining
Amount is iron Fe.
Embodiment 3: the production method and embodiment 1 of the present embodiment are essentially identical, and the same thing is not repeated, and difference exists
In: a kind of automobile steering device shell solution strengthening ferrite ductile cast iron, chemical composition is by weight percentage are as follows: carbon
C 3.20%, silicon Si 3.50%, manganese Mn 0.30%, phosphorus P 0.04%, sulphur S 0.005%, rare earth RE 0.02%, magnesium Mg 0.04% are remaining
Amount is iron Fe.
Embodiment 4: the production method and embodiment 1 of the present embodiment are essentially identical, and the same thing is not repeated, and difference exists
In: a kind of automobile steering device shell solution strengthening ferrite ductile cast iron, chemical composition is by weight percentage are as follows: carbon
C 3.45%, silicon Si 3.55%, manganese Mn 0.25%, phosphorus P 0.01%, sulphur S 0.012%, rare earth RE 0.025%, magnesium Mg 0.05%,
Surplus is iron Fe.
Embodiment 5: the production method and embodiment 1 of the present embodiment are essentially identical, and the same thing is not repeated, and difference exists
In: a kind of automobile steering device shell solution strengthening ferrite ductile cast iron, chemical composition is by weight percentage are as follows: carbon
C 3.30%, silicon Si 3.60%, manganese Mn 0.35%, phosphorus P 0.03%, sulphur S 0.008%, rare earth RE 0.015%, magnesium Mg 0.045%,
Surplus is iron Fe.
Embodiment 6: the production method and embodiment 1 of the present embodiment are essentially identical, and the same thing is not repeated, and difference exists
In: a kind of automobile steering device shell solution strengthening ferrite ductile cast iron, chemical composition is by weight percentage are as follows: carbon
C 3.35%, silicon Si 3.45%, manganese Mn≤0.25%, phosphorus P≤0.02%, sulphur S≤0.010%, rare earth RE≤0.015%, magnesium
Mg0.04%, surplus are iron Fe.
The above is all common instance of the present invention, is not that it is intended that the present invention is limited in any way, all
Any simple modification, equivalent change and modification to the above embodiments according to the technical essence of the invention still fall within this
Within the protection scope of inventive technique scheme.
Claims (1)
1. a kind of automobile steering device shell solution strengthening ferrite ductile cast iron, it is characterised in that: the automobile steering device shell
By weight percentage with the chemical composition of solution strengthening ferrite ductile cast iron are as follows: carbon C 3.10~3.50%, silicon Si3.20
~3.70%, manganese Mn≤0.50%, phosphorus P≤0.05%, sulphur S≤0.015%, rare earth RE≤0.03%, magnesium Mg0.03~0.06%, surplus
For iron Fe；
The production method of the above-mentioned automobile steering device shell solution strengthening ferrite ductile cast iron, concrete technology flow process is such as
Under:
A, electro-smelting operation: melting original soup using 5 tons or 6 tons of intermediate frequency furnaces, sampling of skimming after melting down at 1400 DEG C or more, essence
Refining temperature is 1500 DEG C ± 10 DEG C, quiescence in high temperature 5 minutes or more；
B, original soup requirement: original soup ingredient is qualified, temperature is qualified and can be discharged after net slag, tapping temperature >=1420 DEG C；
C, molten iron is handled:
1. nodulizer: nodulizer selects FeSiMg6RE2,10~25mm of granularity, and additional amount is the 1.0%~1.2% of iron liquid weight；
2. briquetting inovulant: briquetting inovulant select FeSi75,5~25mm of granularity, additional amount be iron liquid weight 0.6~
1.0%；
3. nodularization packet: nodularization packet requires internal diameter d to meet with packet depth h: d/h=1:1.8, bottom are dam-type nodularization room, and nodularization packet is built
After good, using ladle dryer drying, dry thoroughly, scald packet to 600 DEG C or more with original soup using preceding；
4. spheroidising: carrying out spheroidising using the method that pours, charging order is nodulizer, briquetting inovulant, then needs to shakeout
And appropriate compacting, leaving water temperature >=1420 DEG C, spheroidizing reacion time are 50s~80s, nodularization terminates to turn again after needing net slag, covering
Fortune；
D, late inoculation:
Molten iron will carry out late inoculation when ladle-to-ladle, and post inoculant selects FeSi75, and 2~3mm of granularity, additional amount is molten iron
The 0.2% of weight；Net slag, thermometric are needed before casting and spectrum sample is taken to verify final hot metal composition；
E, it casting process: is poured using production line automatic pouring machine；
1. the duration of pouring:
Each nodularization packet duration of pouring control exists: calculating, is no more than 10 minutes since water outlet；Terminate to calculate from nodularization, not surpass
Spend 8 minutes；
2. pouring temperature: the first temperature of pouring temperature is according to the size of product and structure control at 1370~1420 DEG C；
Pouring temperature end box temperature degree is according to the size and structure control of product at 1320~1350 DEG C；
3. current-following inoculation: using the FeSi75 current-following inoculation of 0.2~0.8 mm of granularity in casting process, additional amount is with stream molten iron
The 0.08% of weight；
F, other:
Molten iron passes through mulling, coremaking, moulding, knockout, cleaning, inspection, protection, storage after casting, obtains satisfactory automobile
Steering gear housing solution strengthening ferrite ductile cast iron；
The above-mentioned automobile steering device shell is in solution strengthening ferrite ductile cast iron:
Matrix is based on ferrite, cementite < 1%；
Ontology mechanical property: meet solution strengthening ferritic spheroidal graphite cast iron Europe DIN EN 1563--2012 standard.
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| CN201610755473.1A CN106244911B (en) | 2016-08-30 | 2016-08-30 | Automobile steering device shell solution strengthening ferrite ductile cast iron and its production method |
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|---|---|---|---|
| CN201610755473.1A CN106244911B (en) | 2016-08-30 | 2016-08-30 | Automobile steering device shell solution strengthening ferrite ductile cast iron and its production method |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107686936A (en) * | 2017-08-23 | 2018-02-13 | 广东中天创展球铁有限公司 | A kind of gooseneck material kettle cast iron and preparation method thereof |
| CN109402495A (en) * | 2018-11-28 | 2019-03-01 | 精诚工科汽车系统有限公司 | Alloying element addition method for determination of amount and ductile cast iron casting and its casting and mold in ductile cast iron casting with uniform wall thickness |
| CN110093555A (en) * | 2019-04-25 | 2019-08-06 | 河南广瑞汽车部件股份有限公司 | High-performing car steering gear housing solution strengthening ferritic spheroidal graphite cast iron and production method |
| CN110578084A (en) * | 2019-10-19 | 2019-12-17 | 锦州捷通铁路机械股份有限公司 | Production process of as-cast full-ferrite nodular cast iron material |
| CN112111688B (en) * | 2020-09-16 | 2021-12-10 | 河南广瑞汽车部件股份有限公司 | Nodular cast iron capable of effectively reducing shrinkage cavity and shrinkage porosity tendency and production method thereof |
| CN112126845A (en) * | 2020-09-16 | 2020-12-25 | 河南广瑞汽车部件股份有限公司 | QT500-14 solid solution strengthening ferrite ductile iron for automobile steering gear shell and production method thereof |
| CN114480954B (en) * | 2021-11-29 | 2023-04-07 | 武汉市科发铁合金有限公司 | Three-body composite casting wear-resistant lining plate and manufacturing method thereof |
| CN116479317A (en) * | 2023-04-25 | 2023-07-25 | 中国第一汽车股份有限公司 | QT600-10 lifting ring and production method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102367537A (en) * | 2011-07-11 | 2012-03-07 | 山东汇金股份有限公司 | High strength and toughness as-cast nodular cast iron and its production method |
| CN103422009A (en) * | 2013-08-14 | 2013-12-04 | 辉县市汽车配件有限责任公司 | Nodular cast iron for rear axle housing of lorry and production method of nodular cast iron |
| CN103952622A (en) * | 2014-05-26 | 2014-07-30 | 四川省富邦钒钛制动鼓有限公司 | Vanadium-titanium ferrite ductile iron automobile hub and production process thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1826288B1 (en) * | 2006-02-23 | 2012-04-04 | Daido Tokushuko Kabushiki Kaisha | Ferritic stainless steel cast iron, cast part using the ferritic stainless steel cast iron, and process for producing the cast part |
| JP5366666B2 (en) * | 2009-06-05 | 2013-12-11 | 日野自動車株式会社 | Ferritic CV graphite cast iron |
-
2016
- 2016-08-30 CN CN201610755473.1A patent/CN106244911B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102367537A (en) * | 2011-07-11 | 2012-03-07 | 山东汇金股份有限公司 | High strength and toughness as-cast nodular cast iron and its production method |
| CN103422009A (en) * | 2013-08-14 | 2013-12-04 | 辉县市汽车配件有限责任公司 | Nodular cast iron for rear axle housing of lorry and production method of nodular cast iron |
| CN103952622A (en) * | 2014-05-26 | 2014-07-30 | 四川省富邦钒钛制动鼓有限公司 | Vanadium-titanium ferrite ductile iron automobile hub and production process thereof |
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