CN100537786C - A kind of melting of ultra-large thick-wall spheroidal cast iron element and on-the-spot metamorphism treatment method - Google Patents
A kind of melting of ultra-large thick-wall spheroidal cast iron element and on-the-spot metamorphism treatment method Download PDFInfo
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- CN100537786C CN100537786C CNB2007101946519A CN200710194651A CN100537786C CN 100537786 C CN100537786 C CN 100537786C CN B2007101946519 A CNB2007101946519 A CN B2007101946519A CN 200710194651 A CN200710194651 A CN 200710194651A CN 100537786 C CN100537786 C CN 100537786C
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Abstract
The present invention relates to a kind of melting and on-the-spot metamorphism treatment method of nodular iron casting, especially the melting and the on-the-spot metamorphism treatment method that relate to a kind of ultra-large thick-wall spheroidal cast iron element, it is characterized in that it comprises the steps: the selecting for use of melting unit, reinforced fusing, insulation, nodularization, breeds and pours into a mould; Processing method uniqueness of the present invention, simple has successfully solved little tonnage induction furnace melting large-tonnage molten iron, the rotten processing that has solved large-tonnage spheroidal graphite cast iron effectively, the problems such as graphite segregation at decline problem and heavy wall place in the thick-walled casting type.
Description
Technical field
The present invention relates to a kind of melting and on-the-spot metamorphism treatment method of nodular iron casting, especially relate to a kind of melting and on-the-spot metamorphism treatment method of ultra-large thick-wall spheroidal cast iron element.
Background technology
The melting of spheroidal graphite cast iron and the rotten fusing and the spheroidization and inoculation that mainly refer to molten iron handled are handled.Nodularization is the effect by the nodulizing agent that adds in base iron, makes the graphite in the molten iron be spherical growth.Breed is by adding nucleating agent in base iron, to increase the forming core proton in the base iron, increasing core amounts.Improve casting compactness and performance index.
Induction furnace is mainly adopted in the melting of spheroidal graphite cast iron at present, and the induction melting electric furnace since the equipment and technology problem limit general capacity can be above 30 tons.At the foundry goods more than 50 tons, adopt electric arc furnace to melt for poured weights, but during the electric arc furnace fusing because local temperature is too high, can cause a large amount of forming core cores by scaling loss, may be melted into " ladle heel water ".In addition, the molten iron of a spheroidization and inoculation processing more than 50 tons, the decline of spheroidization and inoculation effect is difficult to control, and the yet very difficult control of decline does not also have the method that solves at present in the type of ultra-large thick-wall foundry goods.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of processing method uniqueness, simple is provided, successfully solved little tonnage induction furnace melting large-tonnage molten iron, solved the rotten processing of large-tonnage spheroidal graphite cast iron effectively, the melting and the on-the-spot metamorphism treatment method of a kind of ultra-large thick-wall spheroidal cast iron element of the problems such as graphite segregation at decline problem and heavy wall place in the thick-walled casting type.
In order to realize goal of the invention, the present invention realizes in the following way:
A kind of melting of ultra-large thick-wall spheroidal cast iron element and on-the-spot metamorphism treatment method is characterized in that it comprises the steps:
A. selecting for use of melting unit: select for use a cover electrical equipment to drive two respectively smaller or equal to 20 tons induction furnace;
B. reinforced fusing: melt in one of them above-mentioned induction furnace of earlier raw material being packed into, the melting process temperature remains on 1350～1390 ℃, after fusing is finished, temperature when carrying out composition detection and composition adjustment is less than 1470 ℃, be warming up to 1480～1520 ℃ overheated after the composition adjustment is qualified, under temperature of superheat, keep tapping a blast furnace after 3～10 minutes, start another above-mentioned induction furnace simultaneously and melt;
C. insulation: the above-mentioned earlier molten iron that fusing is good poured in the insulation bag be incubated, the molten iron of back fusing is poured in the heavy bag after adjusting composition and temperature, will be incubated more also to pour in heavy the bag after molten iron in the bag melts down heating;
D. nodularization: the above-mentioned molten iron that concentrates in the heavy bag is transported to the cast scene wraps to contracting out iron, molten iron goes out after about about 60% to stop, spheroidizing reacion begins, and reacts after about about 3 minutes more remaining molten iron have been gone out, after rolling from casting ladle bottom blown inert gas;
E. breed: when spheroidizing reacion proceeds to 2～3 minutes and goes out molten iron again, breed to special use and to add nucleating agent in the groove and breed, innoculant adding quantity is 0.5%～1.0% of a weight of molten iron;
F. cast: adopt heavy end leakage formula cast, open the casting ladle slide gate nozzle, after molten iron is full of mouth of a river basin, provokes the mouth of a river and block up static several seconds, open current-following inoculation device simultaneously, current-following inoculation agent add-on is 0.05～0.3% of a weight of molten iron;
The rate of temperature fall of the molten iron in the described insulation bag is less than 2 ℃/minute;
Described nodulizing agent is iridium based heavy rare earths nodulizing agent, rare earth magnesium nodularizer and Si-Mg alloy nodulizing agent, and its weight percent is 0.8%～1.4%:0.1%～0.3%:0.05%～0.25%;
Described nucleating agent is long-acting silicon titanate innoculant and silicon carbide nucleating agent, and its weight percentage is respectively 0.4%～0.8%, 0.1%～0.3%.
The present invention has following effect:
1) utilize cover 2 little tonnages of electrical equipment (X) induction furnace to melt〉the molten iron production ultra-large thick-wall spheroidal cast iron of 3X: in this invention, the general principle of fusing is exactly the alternately fusings fast of many stoves, reduce in the time of high-temperature residence, to prevent the scaling loss of forming core core as far as possible.
2) processing method uniqueness: the good molten iron of the present invention's fusing earlier will be poured in the insulation bag and be incubated, and the molten iron in the insulation bag will be controlled rate of temperature fall, and the cooling of per minute is less than 2 ℃/minute.The molten iron of back fusing is poured in the heavy bag after adjusting composition and temperature, to be incubated and also pour in the heavy bag after the interior molten iron of bag melts down heating, Bao Wen molten iron will increase core processing to remedy the core in the loss of insulation loitering phase when melting down simultaneously; Molten iron concentrates on and is transported to the cast scene in the heavy bag and wraps contracting out iron, molten iron goes out after about about 60% to stop, spheroidizing reacion begins, react after about about 3 minutes more remaining molten iron have been gone out, after rolling from reacting completely of making of casting ladle bottom blown inert gas, fully, when spheroidizing reacion proceeds to 2 ~ 3 minutes and goes out molten iron again, breed to special use and to add nucleating agent in the groove and breed.
3) strengthened the anti-ageing ability of moving back of iron liquid and reduce the thick large part of foundry goods and produce possibility of graphite segregation defective, effectively prevent the spheroidization and inoculation decline: nodulizing agent employing iridium based heavy rare earths nodulizing agent, rare earth magnesium nodularizer and Si-Mg alloy nodulizing agent are used in combination according to a certain percentage among the present invention, strengthened the anti-ageing ability of moving back of iron liquid and reduced the possibility that the thick large part of foundry goods produces graphite segregation defective, nucleating agent adopts long-acting silicon titanate innoculant and silicon carbide nucleating agent to be used in combination by proper proportion.And want strict control spheroidization and inoculation intact to the duration of pouring, and effectively prevent the spheroidization and inoculation decline, guarantee the effect of spheroidization and inoculation.
4) increase non-spontaneous nucleation core, strengthen the instant inoculation effect, the control molten iron is in the duration of pouring of calculating: the present invention's cast finishes and adopts heavy end leakage formula cast.Open the casting ladle slide gate nozzle, after molten iron is full of mouth of a river basin, static several seconds, be beneficial to bits come-up in the molten iron, provoke the mouth of a river and block up, open current-following inoculation device simultaneously, increase non-spontaneous nucleation core, strengthen the instant inoculation effect, the control molten iron is poured into a mould in the duration of pouring of calculating and is finished.
5) the objective of the invention is to utilize cover 2 little tonnages of electrical equipment (X) induction furnace to melt〉the molten iron production ultra-large thick-wall spheroidal cast iron of 3X.Smelting process of the present invention has successfully solved the melting of many stoves of large-tonnage spheroidal graphite cast iron; The on-the-spot spheroidization and inoculation technology of cast has successfully realized the nodularization and the inoculation of ultra-large thick-wall spheroidal cast iron, and has solved thick big spheroidization and inoculation decline problem well.
6) ultra-large thick-wall spheroidal cast iron melting and rotten treatment process method, successfully solved little tonnage induction furnace melting large-tonnage molten iron, solved the rotten processing of large-tonnage spheroidal graphite cast iron effectively, the problems such as graphite segregation at decline problem and heavy wall place in the thick-walled casting type.The present invention has realized the production domesticization of ultra-large thick-wall spheroidal cast iron element, has improved the production technology and the product competitiveness of China's spheroidal graphite cast iron.
Embodiment
A kind of melting of ultra-large thick-wall spheroidal cast iron element and on-the-spot metamorphism treatment method is characterized in that it comprises the steps:
A. selecting for use of melting unit: select for use a cover electrical equipment to drive two respectively smaller or equal to 20 tons induction furnace;
B. reinforced fusing: melt in one of them above-mentioned induction furnace of earlier raw material being packed into, the melting process temperature remains on 1350～1390 ℃, after fusing is finished, temperature when carrying out composition detection and composition adjustment is less than 1470 ℃, be warming up to 1480～1520 ℃ overheated after the composition adjustment is qualified, under temperature of superheat, keep tapping a blast furnace after 3～10 minutes, start another above-mentioned induction furnace simultaneously and melt;
C. insulation: the above-mentioned earlier molten iron that fusing is good poured in the insulation bag be incubated, the molten iron of back fusing is poured in the heavy bag after adjusting composition and temperature, will be incubated more also to pour in heavy the bag after molten iron in the bag melts down heating;
D. nodularization: the above-mentioned molten iron that concentrates in the heavy bag is transported to the cast scene wraps to contracting out iron, molten iron goes out after about about 60% to stop, spheroidizing reacion begins, and reacts after about about 3 minutes more remaining molten iron have been gone out, after rolling from casting ladle bottom blown inert gas;
E. breed: when spheroidizing reacion proceeds to 2～3 minutes and goes out molten iron again, breed to special use and to add nucleating agent in the groove and breed, innoculant adding quantity is 0.5%～1.0% of a weight of molten iron;
F. cast: adopt heavy end leakage formula cast, open the casting ladle slide gate nozzle, after molten iron is full of mouth of a river basin, provokes the mouth of a river and block up static several seconds, open current-following inoculation device simultaneously, current-following inoculation agent add-on is 0.05～0.3% of a weight of molten iron;
The rate of temperature fall of the molten iron in the insulation bag is less than 2 ℃/minute.
Above-mentioned nodulizing agent is iridium based heavy rare earths nodulizing agent, rare earth magnesium nodularizer and Si-Mg alloy nodulizing agent, and its weight percent is 0.8%～1.4%:0.1%～0.3%:0.05%～0.25%.
Above-mentioned nucleating agent is long-acting silicon titanate innoculant and silicon carbide nucleating agent, and its weight percentage is respectively 0.4%～0.8%, 0.1%～0.3%.
Claims (4)
1. the melting of a ultra-large thick-wall spheroidal cast iron element and on-the-spot metamorphism treatment method is characterized in that it comprises the steps:
A. selecting for use of melting unit: select for use a cover electrical equipment to drive two respectively smaller or equal to 20 tons induction furnace;
B. reinforced fusing: melt in one of them above-mentioned induction furnace of earlier raw material being packed into, the melting process temperature remains on 1350～1390 ℃, after fusing is finished, temperature when carrying out composition detection and composition adjustment is less than 1470 ℃, be warming up to 1480～1520 ℃ overheated after the composition adjustment is qualified, under temperature of superheat, keep tapping a blast furnace after 3～10 minutes, start another above-mentioned induction furnace simultaneously and melt;
C. insulation: the above-mentioned earlier molten iron that fusing is good poured in the insulation bag be incubated, the molten iron of back fusing is poured in the heavy bag after adjusting composition and temperature, will be incubated more also to pour in heavy the bag after molten iron in the bag melts down heating;
D. nodularization: the above-mentioned molten iron that concentrates in the heavy bag is transported to the cast scene wraps contracting out iron, molten iron goes out after 60% to stop, and spheroidizing reacion begins, and reacts remaining molten iron have been gone out after 3 minutes, after rolling from casting ladle bottom blown inert gas again;
E. breed: when spheroidizing reacion proceeds to 2～3 minutes and goes out molten iron again, breed to special use and to add nucleating agent in the groove and breed, innoculant adding quantity is 0.5%～1.0% of a weight of molten iron;
F. cast: adopt heavy end leakage formula cast, open the casting ladle slide gate nozzle, after molten iron is full of mouth of a river basin, provokes the mouth of a river and block up static several seconds, open current-following inoculation device simultaneously, current-following inoculation agent add-on is 0.05～0.3% of a weight of molten iron.
2. the melting of a kind of ultra-large thick-wall spheroidal cast iron element as claimed in claim 1 and on-the-spot metamorphism treatment method is characterized in that: the rate of temperature fall of the molten iron in the described insulation bag is for less than 2 ℃/minute.
3. the melting of a kind of ultra-large thick-wall spheroidal cast iron element as claimed in claim 1 or 2 and on-the-spot metamorphism treatment method, it is characterized in that: nodulizing agent is iridium based heavy rare earths nodulizing agent, rare earth magnesium nodularizer and Si-Mg alloy nodulizing agent, and its weight percent is 0.8%～1.4%:0.1%～0.3%:0.05%～0.25%.
4. the melting of a kind of ultra-large thick-wall spheroidal cast iron element as claimed in claim 1 or 2 and on-the-spot metamorphism treatment method, it is characterized in that: described nucleating agent is long-acting silicon titanate innoculant and silicon carbide nucleating agent, its weight percentage is respectively 0.4%～0.8%, and 0.1%～0.3%.
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| CN101633033B (en) * | 2009-08-18 | 2011-05-18 | 太仓林飞铸造有限公司 | Casting method of thick and large castings |
| CN101921945B (en) * | 2010-08-31 | 2012-12-05 | 河北新兴铸管有限公司 | Liquid iron inoculation process for ductile iron pipes |
| CN102019351B (en) * | 2010-12-21 | 2012-11-14 | 宁夏共享集团有限责任公司 | Method for producing spheroidal graphite iron casting with high strength and thick and uniform wall |
| CN102399944A (en) * | 2011-12-29 | 2012-04-04 | 天津市万路科技有限公司 | Desulfurization treatment method for molten iron |
| CN105087847A (en) * | 2014-05-09 | 2015-11-25 | 镇江忆诺唯记忆合金有限公司 | Synthetic cast iron technology for producing high-strength grey cast iron |
| CN104561746A (en) * | 2014-12-29 | 2015-04-29 | 芜湖国鼎机械制造有限公司 | Large-section ductile cast irons, castings and preparation method thereof |
| CN105671235B (en) * | 2016-04-11 | 2017-11-03 | 佛山市旲桥科技有限公司 | A kind of casting iron pan and its casting technique |
| CN106755846A (en) * | 2016-12-16 | 2017-05-31 | 广西大学 | A kind of heat treatment method of cast iron bed piece |
| CN107447163A (en) * | 2017-09-08 | 2017-12-08 | 大连理工大学 | The apparatus and method that industry casts live ultrasonication molten iron |
| CN111304402B (en) * | 2020-04-17 | 2021-06-11 | 齐齐哈尔重型铸造有限责任公司 | Smelting method for large casting production |
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Assignee: NINGXIA CHANGCHENG XUQI MACHINE TOOL CASTING Co.,Ltd. Assignor: NINGXIA KOCEL GROUP Co.,Ltd. Contract fulfillment period: 2009.11.5 to 2015.11.5 Contract record no.: 2009640000002 Denomination of invention: Smelting for ultra-large thick-wall spheroidal cast iron element and on site metamorphism treatment method thereof Granted publication date: 20090909 License type: Exclusive license Record date: 20091221 |
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Address after: 750021, No. 199 Tongxin South Street, Yinchuan economic and Technological Development Zone, Ningxia Patentee after: NINGXIA KOCEL GROUP Co.,Ltd. Patentee after: KOCEL MACHINERY CO.,LTD. Address before: 750021 the Ningxia Hui Autonomous Region Yinchuan Tongxin economic and Technological Development Zone No. 199 South Street Patentee before: NINGXIA KOCEL GROUP Co.,Ltd. Patentee before: NINGXIA KOCEL MACHINERY Co.,Ltd. |
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