CN108588353A - The method that annealing is concentrated in spheroidal graphite cast-iron production - Google Patents
The method that annealing is concentrated in spheroidal graphite cast-iron production Download PDFInfo
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- CN108588353A CN108588353A CN201810143145.5A CN201810143145A CN108588353A CN 108588353 A CN108588353 A CN 108588353A CN 201810143145 A CN201810143145 A CN 201810143145A CN 108588353 A CN108588353 A CN 108588353A
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- 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
- C21D5/00—Heat treatments of cast-iron
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
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Abstract
It is a kind of method that annealing is concentrated in spheroidal graphite cast-iron production the present invention relates to Cast Iron Production annealing process technical field, including inlet pipe holding mode and do not concentrate inlet pipe anneal mode.The method that annealing is concentrated in spheroidal graphite cast-iron production of the present invention, relative to existing annealing process, it can significantly reduce the annealing energy consumption of ductile iron pipe, so as to reduce the production cost of ductile iron pipe, the method that annealing is concentrated in making spheroidal graphite cast-iron of the present invention produce has extensive prospects for commercial application, especially for the manufacturing enterprise for being located in northern area, prospects for commercial application is more preferably.
Description
Technical field
It is the side that annealing is concentrated in a kind of spheroidal graphite cast-iron production the present invention relates to Cast Iron Production annealing process technical field
Method.
Background technology
The purpose of spheroidal graphite cast-iron annealing is the free cementite eliminated in as-cast structure or the eutectoid eliminated in matrix
Cementite, plasticity, toughness and improvement machinability etc. to improve casting, to meet requirement.Ductile iron pipe
Plasticity, toughness depend mainly on matrix, to obtain ferrite matrix, ball milling cast tube generally use double annealing mode.I.e.
In high-temperature area（900 DEG C to 950 DEG C）After keeping the temperature a period of time, temperature is dropped to about 720 DEG C, and keep the temperature at such a temperature,
Substantially obtain ferrite matrix.After two step annealings, it is finally decomposed to ferrite and graphite.Matrix is with ferrite
It is main, contain a small amount of pearlite.
But since water cooling centrifugal ductile cast iron pipes have higher cooling velocity, iron liquid during quick solidification,
There is the generation of 15%-25% eutectic cementites in metallographic structure, tube body section is in " air chill " state, therefore elongation is very low.To carry
High elongation rate, water cooling centrifugation ductile iron tubes need to carry out high temperature（920 DEG C of ＞）Annealing, high annealing can promote eutectic cementite
It decomposes.After the high temperature anneal, the cementite almost all in water cooling centrifugal ductile cast iron pipes metallographic structure is decomposed, ferrite
Ratio be 90% to 95%, pearlite is only 5% to 10%, have higher elongation.
Annealing curve is generally divided into four sections：Bringing-up section, soaking zone, rapid cooling section and slow cooling section.Eutectic is required to ooze in soaking zone
Carbon body is all decomposed, and into after slow cooling section, pearlite starts to decompose, and final matrix is based on ferrite, containing a small amount of
Pearlite.The main purpose of high annealing is the free cementite eliminated in the as-cast structure formed in primary crystallization（Needle
Shape, eutectic and blocky cementite）, in addition also partly play the role of non-uniform components and tissue.Free cementite is more than altogether
It is coarse to analyse cementite, therefore, it is difficult to decompose in low temperature, only can just be decomposed into austenite and graphite by high-temperature heating
Carbon.High-temperature carbonization annealing is made of Four processes：1. cementite resolves into austenite and carbon atom；2. carbon atom passes through
Austenite is to original spheroidal graphite surface aggregation；3. the iron atom at spheroidal graphite edge is migrated, out position is allowed；4. carbon atom inserts iron
The vacancy that atom is conceded, spheroidal graphite agglomeration.
Centrifugal ductile cast tube annealing process after being briefly described as centrifuge casting, initially enters annealing stove heat
Duan Shengwen reaches 920 DEG C or more and keeps the temperature a period of time in soaking zone, and cementite starts to decompose into austenite+graphite, by rapid cooling
After Duan Jiangwen, tube temperature is reduced to 720 DEG C or so, the pearlite decomposition after slow cooling section keeps the temperature a period of time.
Current all cast tube industry anneal capabilities are far longer than centrifuge casting ability, in current Environmental Protection Situation severe conditions
Under, cast tube is taken successively to change the synthetic cast iron mode of manufacture of steel scrap, since the pattern is using steel scrap as main material, is needed steel scrap
After molten iron, then with the molten iron production cast iron.It causes Cast Iron Production continuous due to changing steel scrap, and then cannot be guaranteed annealing furnace
Enter pipe annealing at full capacity, requires control at 920 DEG C or more when due to annealing furnace bringing-up section furnace temperature normarzing annealing, it is normal that there are annealing furnaces
Combustion problem, the annealing furnace sky stove time is longer, and energy waste is serious.
Bulb annealing process mainly has interruption annealing process and blowing out to collect together pipe annealing process at present.Both modes are deposited simultaneously
In the higher problem of energy consumption.
By taking the energy cast tube of Fukang as an example, synthetic cast iron mode of manufacture is used at present, is changed steel scrap and is caused production cannot be continuous, no
It can guarantee that annealing furnace enters pipe annealing at full capacity, the annealing furnace sky stove time is longer, and energy waste is serious.It is interrupted annealing process：With 24
300 tons of base powers measuring and calculating of hour annealing, 6000kw/h load electric stoves are with synthetic cast iron mode of manufacture bulb whole day production capacity 160
Ton, basic every sky stove 12 hours or so；When empty stove, gas consumption 5000m3/h wastes 60000m3 coal gas, according to mesh daily
Preceding ton coal gas production calculates, and wastes 15 tons of coal or more daily.
Blowing out collects together pipe annealing process i.e. when unannealed, stops annealing furnace, bulb collect together it is a certain amount of after restart annealing furnace and move back
The mode of fire, since the operating temperature of annealing furnace normarzing annealing is at 920 DEG C or more, there is heating and take in which（14 is small
When more than）, the heating consumption energy the problem of, and since the heating temperature difference is larger, especially northern low temp area can be to annealing furnace
Body damages, and shortens the service life of furnace body.
Invention content
The method of annealing is concentrated in being produced the present invention provides a kind of spheroidal graphite cast-iron, overcome the above-mentioned prior art no
Foot can effectively solve the problems, such as existing bulb annealing process there are energy consumptions and is higher.
The technical scheme is that realized by following measures：The side of annealing is concentrated in a kind of production of spheroidal graphite cast-iron
Method, including not inlet pipe holding mode and concentration inlet pipe anneal mode；Inlet pipe holding mode does not carry out as follows：By annealing furnace
Control for Kiln Temperature kept the temperature at 400 DEG C to 405 DEG C, during heat preservation, ductile iron pipe is carried out to collect together pipe；Inlet pipe is concentrated to move back
Fiery pattern carries out as follows：Ductile iron pipe feeding furnace temperature is reached and is annealed in 920 DEG C or more of annealing furnace；Work as spheroidal graphite
When collecting together pipe amount and reaching 200 tons or more of cast tube, by annealing furnace never inlet pipe holding mode to concentrating the switching of inlet pipe anneal mode, into
The furnace temperature of annealing furnace DEG C is risen to 920 DEG C or more by pipe holding mode to when concentrating the inlet pipe anneal mode to switch from 400 DEG C to 405；
After the completion of the ductile iron pipe annealing saved bit by bit, by annealing furnace from concentrating inlet pipe anneal mode to switch to not inlet pipe holding mode, collect
When middle inlet pipe anneal mode switches to not inlet pipe holding mode, the furnace temperature of annealing furnace is down to 400 DEG C to 405 from 920 DEG C or more
℃。
Here is the further optimization and/or improvements to foregoing invention technical solution：
Above-mentioned annealing furnace includes bringing-up section, soaking zone, rapid cooling section and slow cooling section；It, will after the completion of the ductile iron pipe annealing saved bit by bit
Annealing furnace is closed the burner of annealing furnace, is stopped to heating furnace from when inlet pipe anneal mode being concentrated to switch to not inlet pipe holding mode
Heating lights the burner of bringing-up section after the temperature of annealing furnace furnace body is less than 400 DEG C, makes annealing furnace from concentration inlet pipe annealing mould
Formula switches to not inlet pipe holding mode.
Concentrate the method for annealing that can be shown relative to existing annealing process in spheroidal graphite cast-iron production of the present invention
Writing reduces the annealing energy consumption of ductile iron pipe, so as to reduce the production cost of ductile iron pipe, spheroidal graphite of the present invention is made to cast
The method that annealing is concentrated in iron production has extensive prospects for commercial application, is looked forward to especially for the production for being located in northern area
Industry, prospects for commercial application is more preferably.
Specific implementation mode
The present invention is not limited by following embodiments, can be determined according to the technique and scheme of the present invention with actual conditions specific
Embodiment.Room temperature, room temperature in the present invention refer generally to 15 DEG C to 25 DEG C of temperature, are commonly defined as 25 DEG C.
With reference to embodiment, the invention will be further described：
Embodiment 1：The method that annealing is concentrated in spheroidal graphite cast-iron production, including not inlet pipe holding mode and concentration inlet pipe annealing mould
Formula；Inlet pipe holding mode does not carry out as follows：The Control for Kiln Temperature of annealing furnace is kept the temperature at 400 DEG C to 405 DEG C, is being protected
In the process of temperature, ductile iron pipe is carried out to collect together pipe；Inlet pipe anneal mode is concentrated to carry out as follows：Ductile iron pipe is sent into stove
Temperature reaches anneals in 920 DEG C or more of annealing furnace；When ductile iron pipe is when collecting together pipe amount and reaching 200 tons or more, by annealing furnace
Never inlet pipe holding mode is to concentration inlet pipe anneal mode switching, when inlet pipe holding mode switches to concentration inlet pipe anneal mode,
The furnace temperature of annealing furnace DEG C is risen to 920 DEG C or more from 400 DEG C to 405；After the completion of the ductile iron pipe annealing saved bit by bit, by annealing furnace
From concentrating inlet pipe anneal mode to switch to not inlet pipe holding mode, inlet pipe anneal mode is concentrated to switch to not inlet pipe holding mode
When, the furnace temperature of annealing furnace is down to 400 DEG C to 405 DEG C from 920 DEG C or more.
The present embodiment 1 collects together pipe by using heat preservation and annealing process is concentrated to anneal, and can significantly reduce ductile iron pipe
Annealing energy consumption.
Pipe collection is collected together in the heat preservation that the present invention is respectively adopted in September, 2017, October with emerging cast tube Fukang limited energy company
The energy consumption data that pipe annealing process is collected together in middle annealing process and interruption annealing process in the prior art and blowing out illustrates,
The daytime on the 23rd of September in 2017 to night on the 27th is as shown in table 1 using the coal gas energy consumption data of interruption annealing process, in October, 2017
The coal gas energy consumption data that daytime on the 1st to night on the 3rd collects together pipe annealing process using blowing out is as shown in table 2, daytime on October 3rd, 2017
The coal gas energy consumption data for collecting together pipe annealing process using blowing out to daytime on the 5th is as shown in table 3.
By contrast table 1, table 2 and table 3 it is found that stage September interruption annealing unit consumption（1 ton of bulb annealing disappears to coal gas
Consumption）1387.5m³/t.100 tons of 1408.4 m3/t of unit consumption of pipe are collected together in two-stage blowing out, and it is few that this stage collects together pipe amount, and overhauls and stop
The stove time is long, and furnace temperature causes 99000 m3 of temperature-rise period gas consumption, it is higher to amortize unit consumption down to 60 DEG C.Three stages collected together pipe 200
Ton, unit consumption 1063.9m3/t, unit consumption reduces 323.6m3/t compared with a stage.
Embodiment 2：The method that annealing is concentrated in spheroidal graphite cast-iron production, including inlet pipe holding mode and concentration inlet pipe do not move back
Fiery pattern；Inlet pipe holding mode does not carry out as follows：The Control for Kiln Temperature of annealing furnace is kept the temperature in 400 DEG C or 405 DEG C,
During heat preservation, ductile iron pipe is carried out to collect together pipe；Inlet pipe anneal mode is concentrated to carry out as follows：Ductile iron pipe is sent
Enter furnace temperature and reach and anneals in 920 DEG C or more of annealing furnace；When ductile iron pipe collect together pipe amount reach meet continuous annealing 6 it is small when
When above, by annealing furnace never inlet pipe holding mode to concentrate inlet pipe anneal mode switching, inlet pipe holding mode to concentrate inlet pipe
When anneal mode switches, the furnace temperature of annealing furnace is risen to 920 DEG C or more from 400 DEG C or 405 DEG C；When the ductile iron pipe annealing saved bit by bit
After the completion, by annealing furnace from concentrate inlet pipe anneal mode to not inlet pipe holding mode switch, concentrate inlet pipe anneal mode to not into
When pipe holding mode switches, the furnace temperature of annealing furnace is down to 400 DEG C or 405 DEG C from 920 DEG C or more.
Embodiment 3：As the optimization of above-described embodiment, annealing furnace includes bringing-up section, soaking zone, rapid cooling section and slow cooling section；
After the completion of the ductile iron pipe annealing saved bit by bit, when annealing furnace is switched from concentration inlet pipe anneal mode to not inlet pipe holding mode,
The burner of annealing furnace is closed, stops, to heating stove heat, after the temperature of annealing furnace furnace body is less than 400 DEG C, lighting bringing-up section
Burner makes annealing furnace switch from concentration inlet pipe anneal mode to not inlet pipe holding mode.
Bulb enters when being made annealing treatment in annealing furnace, is carried out according to conventional annealing flow, i.e., sequentially passes through bringing-up section, heat preservation
Section, rapid cooling section and slow cooling section.
In conclusion the method for concentrating annealing in spheroidal graphite cast-iron of the present invention production, relative to existing annealing process,
It can significantly reduce the annealing energy consumption of ductile iron pipe, so as to reduce the production cost of ductile iron pipe, make of the present invention
Spheroidal graphite cast-iron production in concentrate the method for annealing that there is extensive prospects for commercial application, especially for being located in northern area
Manufacturing enterprise, prospects for commercial application is more preferably.
The above technical characteristic constitutes the embodiment of the present invention, can basis with stronger adaptability and implementation result
Actual needs increases and decreases non-essential technical characteristic, to meet the needs of different situations.
Claims (2)
1. a kind of method for concentrating annealing in spheroidal graphite cast-iron production, it is characterised in that including not inlet pipe holding mode and concentrate inlet pipe
Anneal mode；Inlet pipe holding mode does not carry out as follows：The Control for Kiln Temperature of annealing furnace is protected at 400 DEG C to 405 DEG C
Temperature carries out ductile iron pipe to collect together pipe during heat preservation；Inlet pipe anneal mode is concentrated to carry out as follows：Spheroidal graphite is cast
Pipe is sent into furnace temperature and is reached anneals in 920 DEG C or more of annealing furnace；When ductile iron pipe is when collecting together pipe amount and reaching 200 tons or more,
By annealing furnace never inlet pipe holding mode to concentrate inlet pipe anneal mode switching, inlet pipe holding mode to concentrate inlet pipe anneal mode
When switching, the furnace temperature of annealing furnace DEG C is risen to 920 DEG C or more from 400 DEG C to 405；After the completion of the ductile iron pipe annealing saved bit by bit,
By annealing furnace from concentrating inlet pipe anneal mode to switch to not inlet pipe holding mode, inlet pipe anneal mode is concentrated to keep the temperature mould to not inlet pipe
When formula switches, the furnace temperature of annealing furnace is down to 400 DEG C to 405 DEG C from 920 DEG C or more.
2. the method for concentrating annealing in spheroidal graphite cast-iron production according to claim 1, it is characterised in that annealing furnace includes adding
Hot arc, soaking zone, rapid cooling section and slow cooling section；After the completion of the ductile iron pipe annealing saved bit by bit, annealing furnace is annealed from concentration inlet pipe
When pattern switches to not inlet pipe holding mode, the burner of annealing furnace is closed, is stopped to heating stove heat, when the temperature of annealing furnace furnace body
After degree is less than 400 DEG C, the burner of bringing-up section is lighted, annealing furnace is made to be cut from concentration inlet pipe anneal mode to not inlet pipe holding mode
It changes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810143145.5A CN108588353A (en) | 2018-02-11 | 2018-02-11 | The method that annealing is concentrated in spheroidal graphite cast-iron production |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810143145.5A CN108588353A (en) | 2018-02-11 | 2018-02-11 | The method that annealing is concentrated in spheroidal graphite cast-iron production |
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| CN108588353A true CN108588353A (en) | 2018-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810143145.5A Pending CN108588353A (en) | 2018-02-11 | 2018-02-11 | The method that annealing is concentrated in spheroidal graphite cast-iron production |
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2018
- 2018-02-11 CN CN201810143145.5A patent/CN108588353A/en active Pending
Non-Patent Citations (2)
| Title |
|---|
| 吴波: "球墨铸铁管退火炉节能措施浅析", 《山东冶金》 * |
| 胡玲艳 等: "国内离心球墨铸铁管生产线研究设计", 《冶金自动化》 * |
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