CN108060284A - A kind of vermicular cast iron creepage rate method - Google Patents
A kind of vermicular cast iron creepage rate method Download PDFInfo
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- CN108060284A CN108060284A CN201711380556.8A CN201711380556A CN108060284A CN 108060284 A CN108060284 A CN 108060284A CN 201711380556 A CN201711380556 A CN 201711380556A CN 108060284 A CN108060284 A CN 108060284A
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- vermiculizer
- iron
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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
- C21C1/08—Manufacture of cast-iron
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
A kind of vermicular cast iron creepage rate method of the present invention, solves the problems, such as to be to provide a kind of method for being capable of stability contorting vermicular cast iron nodulizing rate with common creepage rate bag and Chemical bath deposition instrument, the technical solution used for：The weight percent of addition vermiculizer is to be come with the content of element S in base iron definite, and improves an order of magnitude to specific add value, so as to solve the problems, such as vermicularizing pass percent of the vermicularizing treatment process, the present invention is widely used in vermicular cast iron technical field.
Description
Technical field
The present invention relates to cast iron process technical fields, and in particular to a kind of method of stability contorting vermicular cast iron nodulizing rate.
Background technology
Vermicular cast iron is a kind of novel high-performance engineering material, has the overall merit of magnesium iron and advanced gray cast iron concurrently, has
Unique purposes, is widely used in auto industry assembly and spare and accessory parts, in automobile engine, exhaust manifold, diesel engine cylinder cover, system
Dynamic parts etc. have obtained good effect.In recent years, vermicular cast iron has obtained significant progress, the world international and domestic
The prestige cars such as famous brand name Audi, BMW enterprise effectively increases the efficiency of automobile engine with compacted iron replacement alloy cast iron
And performance.
At present, domestic and international foundry industry, steadily to obtain defined nodulizing rate, is adopted when producing vermicular cast iron casting parts
Main method is：Automatic injection feeding technology, Xin Te Karst method.This method must use and invest big overall process computer control
System processed, using expensive on-line monitoring probe detection iron melt quality, operation automation feeding wire machine, use are compacted after computer is handled
Agent core-spun yarn does creepage rate.
Do not possess above-mentioned condition for those, only with the enterprise of common creepage rate bag and chemical constituent analyzer, it is difficult to
Stable nodulizing rate is obtained, because nodulizing rate is less than prescribed limit or the substantial amounts of waste product caused by being mutated into flake graphite.
The content of the invention
Present invention solves the technical problem that it is to provide a kind of common creepage rate bag and Chemical bath deposition instrument energy
The method of enough stability contorting vermicular cast iron nodulizing rates.
In order to solve the above-mentioned technical problem, the technical solution adopted in the present invention is：A kind of vermicular cast iron creepage rate side
Method, step are followed successively by furnace charge preparation, Smelting of iron, creepage rate and pouring cast part, during the creepage rate, add compactedization
The weight percent of agent be come with the content of element S in base iron it is definite, when S in the base iron content be 0.0120-
When 0.0140%, the additive amount of the vermiculizer is 0.210--0.230%；
When the content of S in the base iron is 0.0140--0.0160%, the additive amount of the vermiculizer is 0.230--
0.255%；
When the content of S in the base iron is 0.0160--0.0180%, the additive amount of the vermiculizer is 0.255--
0.285%；
When the content of S in the base iron is 0.0180--0.0200%, the additive amount of the vermiculizer is 0.285--
0.330%；
When the content of S in the base iron is 0.0200--0.0220%, the additive amount of the vermiculizer is 0.330--
0.385%；
When the content of S in the base iron is 0.0220--0.0240%, the additive amount of the vermiculizer is 0.385--
0.450%；
When the content of S in the base iron is 0.0240--0.0260%, the additive amount of the vermiculizer is 0.450--
0.525%；
The nodulizing rate that additive amount according to above-mentioned vermiculizer obtains is 55-75%, is added with the corresponding vermiculizer of above-mentioned sulfur content of hot metal
On the basis of dosage, nodulizing rate often increases 10%, and vermiculizer additive amount reduces 0.001%-0.01%；Nodulizing rate often reduces 10%, compactedization
Agent additive amount increases 0.001%-0.01%；
The weight percent content of each component is in the vermiculizer：Re 7-9%, Mg 3-5%, Ca 2-3%, Si 42-47%,
Yu Weitie.
In the Smelting of iron step, it is 3.4-3.8% to control C element content in base iron.
Include before the creepage rate step：Slag hitting is clean before sampling, and probe temperature is controlled at 1500 DEG C ± 10 DEG C；Heat point
The temperature of analyzer carbon determination silicon is at 1350-1400 DEG C；
Molten iron wants stewing process, 1550 DEG C of dwell temperature, power failure time of repose 5-8min before coming out of the stove；Timely slag hitting is wanted before standing；
Tapping temperature is controlled at 1500-1540 DEG C；
Nodularization bag and pouring ladle will be cleaned out before, it is impossible to and there is buildup accumulated slag situation, to be toasted before use and scald bag,
The control of bag temperature is scalded at 1550 DEG C；
Vermiculizer is laid in compactedization room bottom, then in uniform fold inovulant above；
Speed of tapping a blast furnace is controlled, 10-15s, which taps a blast furnace, to be finished.
The pouring cast part process is completed in 8min, controls first box temperature degree≤1430 DEG C, controls last box temperature degree >=1360
℃。
As described above, the present invention has an advantageous effect in that compared with prior art：The iron of compactedization can relatively be stablized
Water, the qualification rate of the compactedization cast iron improved.The cooperation sustained release compactedization method and the vermiculizer are further carrying
While high vermiculation effect, reduction nodulizing rate are differential, the reaction speed of vermiculizer and molten iron can also be controlled, it is delayed to fail
Journey, that reduces molten iron melts down rate.The vermicular cast iron chilling tendency that the present invention obtains is small, and the slenderness ratio of quasiflake graphite is smaller（I.e.
Quasiflake graphite seems thick）, plasticity and toughness are good.
The existing additive amount that vermiculizer is determined according to Sulfur Content in Hot Iron content, it is wider to the measurement range of sulfur content, usually
10-5The order of magnitude, and sulfur content is accurate to 10 by the present invention-6The order of magnitude can greatly improve the qualification rate of nodulizing rate, by
The 70%-75% of the prior art is increased to improved 99%；It is 50%-80% that nodulizing rate can be steadily produced by national standard, compactedization
Rate is more than 80% pieces of vermicular cast iron.Technical solution according to the invention can meet national standard GB/T 26655-2011 requirements.
Specific embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1
A kind of vermicular cast iron creepage rate method, step are followed successively by furnace charge preparation, Smelting of iron, creepage rate and pouring cast part,
During the creepage rate, the weight percent that adds vermiculizer is to be come with the content of element S in base iron definite, works as institute
When the content for stating S in base iron is 0.0125%, the additive amount of the vermiculizer is 0.180%, when the content of S in the base iron
For 0.0156% when, the additive amount of the vermiculizer is 0.249%, described when the content of S in the base iron is 0.0173%
The additive amount of vermiculizer is 0.279%, and when the content of S in the base iron is 0.0198%, the additive amount of the vermiculizer is
0.280%, when the content of S in the base iron is 0.0235%, the additive amount of the vermiculizer is 0.600%；
The weight percent content of each component is in the vermiculizer：Re 7-9%, Mg 3-5%, Ca 2-3%, Si 42-47%,
Yu Weitie.
In the creepage rate step, the compactedization time is 5-10 minutes.
In the Smelting of iron step, it is 3.5-3.7% to control C element content in base iron.
Include before the creepage rate step：Slag hitting is clean before sampling, and probe temperature is controlled at 1500 DEG C ± 10 DEG C；Heat point
The temperature of analyzer carbon determination silicon estimates conjunctiva at 1400 DEG C；
Molten iron wants stewing process, 1550 DEG C of dwell temperature, power failure time of repose 5-8min before coming out of the stove；Timely slag hitting is wanted before standing；
Tapping temperature is controlled at 1500-1530 DEG C；
Nodularization bag and pouring ladle will be cleaned out before, it is impossible to and there is buildup accumulated slag situation, to be toasted before use and scald bag,
The control of bag temperature is scalded at 1550 DEG C；
Vermiculizer is laid in compactedization room bottom, then in uniform fold inovulant above；
Speed of tapping a blast furnace is controlled, 10-15s, which taps a blast furnace, to be finished.
The pouring cast part process is completed in 8min, controls first box temperature degree≤1430 DEG C, controls last box temperature degree >=1360
℃。
Embodiment 2
A kind of vermicular cast iron creepage rate method, step are followed successively by furnace charge preparation, Smelting of iron, creepage rate and pouring cast part,
During the creepage rate, the weight percent that adds vermiculizer is to be come with the content of element S in base iron definite, works as institute
When the content for stating S in base iron is 0.0120%, the additive amount of the vermiculizer is 0.188%, when the content of S in the base iron
For 0.0160% when, the additive amount of the vermiculizer is 0.240%, described when the content of S in the base iron is 0.0173%
The additive amount of vermiculizer is 0.250%, and when the content of S in the base iron is 0.0198%, the additive amount of the vermiculizer is
0.300%, when the content of S in the base iron is 0.0245%, the additive amount of the vermiculizer is 0.660%；
The weight percent content of each component is in the vermiculizer：Re 7-9%, Mg 3-5%, Ca 2-3%, Si 42-47%,
Yu Weitie.
In the creepage rate step, the compactedization time is 5-10 minutes.
In the Smelting of iron step, it is 3.5-3.7% to control C element content in base iron.
Include before the creepage rate step：Slag hitting is clean before sampling, and probe temperature is controlled at 1500 DEG C ± 10 DEG C；Heat point
The temperature of analyzer carbon determination silicon estimates conjunctiva at 1400 DEG C；
Molten iron wants stewing process, 1550 DEG C of dwell temperature, power failure time of repose 5-8min before coming out of the stove；Timely slag hitting is wanted before standing；
Tapping temperature is controlled at 1500-1530 DEG C；
Nodularization bag and pouring ladle will be cleaned out before, it is impossible to and there is buildup accumulated slag situation, to be toasted before use and scald bag,
The control of bag temperature is scalded at 1550 DEG C；
Vermiculizer is laid in compactedization room bottom, then in uniform fold inovulant above；
Speed of tapping a blast furnace is controlled, 10-15s, which taps a blast furnace, to be finished.
The pouring cast part process is completed in 8min, controls first box temperature degree≤1430 DEG C, controls last box temperature degree >=1360
℃。
Embodiment 3
A kind of vermicular cast iron creepage rate method, step are followed successively by furnace charge preparation, Smelting of iron, creepage rate and pouring cast part,
During the creepage rate, the weight percent that adds vermiculizer is to be come with the content of element S in base iron definite, works as institute
When the content for stating S in base iron is 0.0140%, the additive amount of the vermiculizer is 0.180%, when the content of S in the base iron
For 0.0150% when, the additive amount of the vermiculizer is 0.249%, described when the content of S in the base iron is 0.0180%
The additive amount of vermiculizer is 0.250%, and when the content of S in the base iron is 0.0200%, the additive amount of the vermiculizer is
0.280%, when the content of S in the base iron is 0.0250%, the additive amount of the vermiculizer is 0.460%；
The weight percent content of each component is in the vermiculizer：Re 7-9%, Mg 3-5%, Ca 2-3%, Si 42-47%,
Yu Weitie.
In the creepage rate step, the compactedization time is 5-10 minutes.
In the Smelting of iron step, it is 3.5-3.7% to control C element content in base iron.
Include before the creepage rate step：Slag hitting is clean before sampling, and probe temperature is controlled at 1500 DEG C ± 10 DEG C；Heat point
The temperature of analyzer carbon determination silicon estimates conjunctiva at 1400 DEG C；
Molten iron wants stewing process, 1550 DEG C of dwell temperature, power failure time of repose 5-8min before coming out of the stove；Timely slag hitting is wanted before standing；
Tapping temperature is controlled at 1500-1530 DEG C；
Nodularization bag and pouring ladle will be cleaned out before, it is impossible to and there is buildup accumulated slag situation, to be toasted before use and scald bag,
The control of bag temperature is scalded at 1550 DEG C；
Vermiculizer is laid in compactedization room bottom, then in uniform fold inovulant above；
Speed of tapping a blast furnace is controlled, 10-15s, which taps a blast furnace, to be finished.
The pouring cast part process is completed in 8min, controls first box temperature degree≤1430 DEG C, controls last box temperature degree >=1360
℃。
Rejection rate is reduced to improved 4%-6% by the 30%-40% of the prior art.
Nodulizing rate is 50%-80%.
The above embodiment is merely exemplary to illustrate the principle of the present invention and its effect, and is not intended to limit the present invention.For
Person skilled in the art can all modify above-described embodiment or changed under the spirit and scope without prejudice to the present invention.Therefore,
It is all lift have in the technical field usually intellectual without departing from disclosed spirit with being completed under technological thought
All equivalent modifications or change, should by the present invention claim be covered.
Claims (4)
1. a kind of vermicular cast iron creepage rate method, step is followed successively by furnace charge preparation, Smelting of iron, creepage rate and cast casting
Part, it is characterised in that：During the creepage rate, the weight percent that adds vermiculizer is contained with element S in base iron
Measure what is determined, when the content of S in the base iron is 0.0120-0.0140%, the additive amount of the vermiculizer is
0.210--0.230%；
When the content of S in the base iron is 0.0140--0.0160%, the additive amount of the vermiculizer is 0.230--
0.255%；
When the content of S in the base iron is 0.0160--0.0180%, the additive amount of the vermiculizer is 0.255--
0.285%；
When the content of S in the base iron is 0.0180--0.0200%, the additive amount of the vermiculizer is 0.285--
0.330%；
When the content of S in the base iron is 0.0200--0.0220%, the additive amount of the vermiculizer is 0.330--
0.385%；
When the content of S in the base iron is 0.0220--0.0240%, the additive amount of the vermiculizer is 0.385--
0.450%；
When the content of S in the base iron is 0.0240--0.0260%, the additive amount of the vermiculizer is 0.450--
0.525%；
The nodulizing rate that additive amount according to above-mentioned vermiculizer obtains is 55-75%, is added with the corresponding vermiculizer of above-mentioned sulfur content of hot metal
On the basis of dosage, nodulizing rate often increases 10%, and vermiculizer additive amount reduces 0.001%-0.01%；Nodulizing rate often reduces 10%, compactedization
Agent additive amount increases 0.001%-0.01%；
The weight percent content of each component is in the vermiculizer：Re 7-9%, Mg 3-5%, Ca 2-3%, Si 42-47%,
Yu Weitie.
2. a kind of vermicular cast iron creepage rate method according to claim 1, it is characterised in that：The Smelting of iron step
In, it is 3.4-3.8% to control C element content in base iron.
3. a kind of vermicular cast iron creepage rate method according to claim 1, it is characterised in that：The creepage rate step
Before include：Slag hitting is clean before sampling, and probe temperature is controlled at 1500 DEG C ± 10 DEG C；The temperature of thermal analyzer carbon determination silicon is in 1350-
1400℃；
Molten iron wants stewing process, 1550 DEG C of dwell temperature, power failure time of repose 5-8min before coming out of the stove；Timely slag hitting is wanted before standing；
Tapping temperature is controlled at 1500-1540 DEG C；
Nodularization bag and pouring ladle will be cleaned out before, it is impossible to and there is buildup accumulated slag situation, to be toasted before use and scald bag,
The control of bag temperature is scalded at 1550 DEG C；
Vermiculizer is laid in compactedization room bottom, then in uniform fold inovulant above；
Speed of tapping a blast furnace is controlled, 10-15s, which taps a blast furnace, to be finished.
4. a kind of vermicular cast iron creepage rate method according to claim 1, it is characterised in that：The pouring cast part process
It is completed in 8min, controls first box temperature degree≤1430 DEG C, control last box temperature degree >=1360 DEG C.
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| CN201711380556.8A CN108060284A (en) | 2017-12-20 | 2017-12-20 | A kind of vermicular cast iron creepage rate method |
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| CN201711380556.8A CN108060284A (en) | 2017-12-20 | 2017-12-20 | A kind of vermicular cast iron creepage rate method |
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Family
ID=62139736
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110564915A (en) * | 2019-10-12 | 2019-12-13 | 中国重汽集团济南动力有限公司 | Magnesium core-spun yarn for vermicular treatment and use method thereof |
| CN111187973A (en) * | 2020-03-02 | 2020-05-22 | 锦州捷通铁路机械股份有限公司 | High-elongation RuT400 vermicular graphite cast iron and production process thereof |
| CN114318119A (en) * | 2021-11-29 | 2022-04-12 | 四川共享铸造有限公司 | High-strength vermicular graphite cast iron and production method thereof |
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| CN101555565A (en) * | 2008-04-11 | 2009-10-14 | 广西玉柴机器股份有限公司 | Process for producing vermicular cast iron by cupola-line frequency furnace duplex melting |
| CN102605134A (en) * | 2012-04-12 | 2012-07-25 | 日月重工股份有限公司 | Manufacture method of vermicular cast iron steam cylinder cover |
| CN102808060A (en) * | 2012-08-29 | 2012-12-05 | 福建省建阳市杜氏铸造有限公司 | Vermicular agent and preparation method thereof |
| CN103131942A (en) * | 2011-11-30 | 2013-06-05 | 山东省源通机械股份有限公司 | Vermicular graphite cast iron with high percent of vermiculation of combustion motor cylinder body and cylinder cover and preparation method |
| CN105483508A (en) * | 2014-09-29 | 2016-04-13 | 常州朗锐铸造有限公司 | Alloy vermicular graphite cast iron for railway vehicle brake disc and smelting method of alloy vermicular graphite cast iron |
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Patent Citations (5)
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| CN101555565A (en) * | 2008-04-11 | 2009-10-14 | 广西玉柴机器股份有限公司 | Process for producing vermicular cast iron by cupola-line frequency furnace duplex melting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110564915A (en) * | 2019-10-12 | 2019-12-13 | 中国重汽集团济南动力有限公司 | Magnesium core-spun yarn for vermicular treatment and use method thereof |
| CN111187973A (en) * | 2020-03-02 | 2020-05-22 | 锦州捷通铁路机械股份有限公司 | High-elongation RuT400 vermicular graphite cast iron and production process thereof |
| CN114318119A (en) * | 2021-11-29 | 2022-04-12 | 四川共享铸造有限公司 | High-strength vermicular graphite cast iron and production method thereof |
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Application publication date: 20180522 |
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