RU2156809C1 - Method for making high strength cast iron - Google Patents
Method for making high strength cast iron Download PDFInfo
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- RU2156809C1 RU2156809C1 RU2000101373A RU2000101373A RU2156809C1 RU 2156809 C1 RU2156809 C1 RU 2156809C1 RU 2000101373 A RU2000101373 A RU 2000101373A RU 2000101373 A RU2000101373 A RU 2000101373A RU 2156809 C1 RU2156809 C1 RU 2156809C1
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- RU
- Russia
- Prior art keywords
- cast iron
- melt
- melting
- high strength
- ligature
- Prior art date
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- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000002844 melting Methods 0.000 claims abstract description 11
- 230000008018 melting Effects 0.000 claims abstract description 11
- 238000005266 casting Methods 0.000 claims abstract description 10
- 238000012986 modification Methods 0.000 claims abstract description 8
- 230000004048 modification Effects 0.000 claims abstract description 8
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 6
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 4
- 239000011593 sulfur Substances 0.000 claims abstract description 4
- 239000000155 melt Substances 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 238000012546 transfer Methods 0.000 claims description 5
- 230000006698 induction Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 2
- 230000032683 aging Effects 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 4
- 229910045601 alloy Inorganic materials 0.000 abstract description 3
- 239000000956 alloy Substances 0.000 abstract description 3
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000011159 matrix material Substances 0.000 abstract description 2
- 239000004411 aluminium Substances 0.000 abstract 1
- 235000011194 food seasoning agent Nutrition 0.000 abstract 1
- 238000011221 initial treatment Methods 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910001141 Ductile iron Inorganic materials 0.000 description 2
- 229910001338 liquidmetal Inorganic materials 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
Изобретение относится к области литейного производства и металлургии, а именно к способам получения высокопрочного чугуна с графитом вермикулярной и шаровидной формы, и может быть использовано при массовом производстве отливок. The invention relates to the field of foundry and metallurgy, and in particular to methods for producing high-strength cast iron with graphite of vermicular and spherical shape, and can be used in mass production of castings.
Существующий способ получения чугунов с шаровидным и вермикулярным графитом на базе исходного чугуна с высоким содержанием серы с использованием лигатур на базе редкоземельных металлов и кремния заключается в введении лигатуры в раздаточный ковш с обязательным вторичным модифицированием для устранения отбела 75% ферросилицием в количестве 0,5-0,8% от массы жидкого металла. The existing method of producing cast iron with spherical and vermicular graphite based on the source iron with high sulfur content using alloys based on rare-earth metals and silicon consists in introducing the ligature into the transfer ladle with obligatory secondary modification to eliminate bleached 75% ferrosilicon in an amount of 0.5-0 , 8% of the mass of liquid metal.
Недостатком этого процесса является перенасыщение феррита матрицы кремнием и получение в структуре части графита звездообразной формы, что не позволяет получить чугун с высокими механическими свойствами (см. книгу "Высококачественные чугуны для отливок" под редакцией Н.Н. Александрова. - М.: Машиностроение, 1982, с. 193)
Задачей, решаемой настоящим изобретением, является управление процессом структурообразования высокопрочного чугуна в процессе плавки и разливки.The disadvantage of this process is the supersaturation of the matrix ferrite with silicon and the formation of a star-shaped graphite part of the graphite, which does not allow to obtain cast iron with high mechanical properties (see the book "High-quality cast iron for castings" edited by NN Aleksandrov. - M .: Engineering, 1982, p. 193)
The problem solved by the present invention is to control the process of structure formation of ductile iron in the process of melting and casting.
Техническим результатом, достигаемым в результате использования изобретения, является стабильность и равномерность структуры и прочностных свойств чугуна в отливках массой от 0,5 до 30 кг при толщине стенки от 5 до 40 мм и уменьшение количества брака за счет возможности коррекции ошибок, допущенных при введении лигатуры в раздаточный ковш большой емкости. Разброс по содержанию химических элементов лигатуры в раздаточном ковше неизбежен, так как он зависит от многих факторов, например, температуры заливаемого металла, уровня заливки металла, который является чисто субъективным фактором, и т.д. The technical result achieved by using the invention is the stability and uniformity of the structure and strength properties of cast iron in castings weighing from 0.5 to 30 kg with a wall thickness of 5 to 40 mm and reducing the number of defects due to the possibility of correcting errors made during the introduction of the ligature into a large capacity transfer bucket. A scatter in the content of the chemical elements of the ligature in the transfer bucket is inevitable, since it depends on many factors, for example, the temperature of the metal being poured, the level of metal poured, which is a purely subjective factor, etc.
Указанный технический результат достигается тем, что в способе получения высокопрочного чугуна из исходного чугуна с содержанием серы свыше 0,4%, включающем расплавление шихты в плавильном агрегате, доводку температуры расплава до 1420-1450oC, обработку его лигатурой, содержащей 30-33% редкоземельных металлов, 43-44% кремния и 8-9% алюминия, в количестве 1,4-1,8% от массы расплава, вторичное модифицирование в разливочном ковше проводят той же лигатурой, что и предварительное, в количестве 0,1-0,5% от массы металла при температуре расплава от 1400 до 1300oC.The specified technical result is achieved by the fact that in the method for producing high-strength cast iron from initial cast iron with a sulfur content of more than 0.4%, including melting the charge in the melting unit, adjusting the melt temperature to 1420-1450 o C, treating it with a ligature containing 30-33% rare earth metals, 43-44% silicon and 8-9% aluminum, in the amount of 1.4-1.8% by weight of the melt, secondary modification in the casting ladle is carried out with the same ligature as the preliminary one, in the amount of 0.1-0 , 5% by weight of the metal at a melt temperature of from 1400 to 1300 o C.
Кроме того, первоначальную обработку расплава лигатурой ведут в раздаточном ковше. In addition, the initial processing of the melt by the ligature is carried out in the transfer bucket.
Кроме того, в качестве плавильного агрегата используют индукционную или дуговую печь. In addition, an induction or arc furnace is used as the melting unit.
Способ реализуется следующим образом. Чугун плавили в шеститонной индукционной печи и перегрели до температуры 1440oC. Химический состав исходного чугуна приведен в табл. 1. На дно разогретого раздаточного ковша засыпали лигатуру, содержащую 30-33% редкоземельных металлов, 43-44% кремния, 8-9% алюминия, остальное - железо, в количестве 1,7% от емкости ковша, накрывали лигатуру стальной вырубкой и заливали расплавом из печи. Жидкий металл выдерживали в течение 5 мин до прекращения обильного шлаковыделения. Периодически шлак снимали. Отливали детали типа серьга весом 700 г с толщиной стенки до 40 мм и стандартные разрывные образцы диаметром 20 мм. Заливку производили в земляные формы. Вторичное модифицирование проводили в разливочном ковше емкостью 30 кг, добавляя лигатуру в следующих количествах от емкости ковша: ковш N 1 - 0,10%; ковш N 2 - 0,25%; ковш N 3 - 0,50%
Металлографические исследования и химический анализ проводили на деталях, механические испытания на образцах. Химический состав приведен в табл. 1, структура и механические свойства в табл. 2.The method is implemented as follows. Cast iron was melted in a six-ton induction furnace and overheated to a temperature of 1440 o C. The chemical composition of the source cast iron is given in table. 1. A ligature containing 30-33% of rare-earth metals, 43-44% of silicon, 8-9% of aluminum, the rest is iron, in the amount of 1.7% of the capacity of the bucket, was covered with a ligature and poured onto the bottom of a heated dispensing bucket melt from the furnace. The liquid metal was kept for 5 min until the abundance of slag ceased. Periodically, the slag was removed. Molded parts such as earrings weighing 700 g with a wall thickness of up to 40 mm and standard tensile specimens with a diameter of 20 mm. Pouring made in earthen forms. Secondary modification was carried out in a casting ladle with a capacity of 30 kg, adding a ligature in the following quantities from the ladle capacity: ladle N 1 - 0.10%; bucket N 2 - 0.25%; bucket N 3 - 0.50%
Metallographic studies and chemical analysis were carried out on the details, mechanical tests on samples. The chemical composition is given in table. 1, structure and mechanical properties in table. 2.
Как видно из результатов эксперимента, применение двойного модифицирования РЗМ лигатурой одинакового состава позволяет управлять процессом структурообразования высокопрочного чугуна в процессе плавки и разливки. As can be seen from the results of the experiment, the use of double modification of rare-earth metals with a ligature of the same composition allows you to control the process of structure formation of ductile iron in the process of melting and casting.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RU2000101373A RU2156809C1 (en) | 2000-01-21 | 2000-01-21 | Method for making high strength cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RU2000101373A RU2156809C1 (en) | 2000-01-21 | 2000-01-21 | Method for making high strength cast iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| RU2156809C1 true RU2156809C1 (en) | 2000-09-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| RU2000101373A RU2156809C1 (en) | 2000-01-21 | 2000-01-21 | Method for making high strength cast iron |
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| RU (1) | RU2156809C1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2188240C1 (en) * | 2001-04-19 | 2002-08-27 | Рушаник Борис Авсеевич | Method of high-strength cast iron production |
| RU2225885C2 (en) * | 2002-03-07 | 2004-03-20 | Открытое акционерное общество "Северсталь" | Method of production of graphitized conversion foundry pig iron |
| RU2315815C1 (en) * | 2006-04-07 | 2008-01-27 | Открытое акционерное общество "КАМАЗ-Металлургия" | Method for producing of vermiculate graphite cast-iron |
| RU2337973C2 (en) * | 2006-09-11 | 2008-11-10 | Открытое акционерное общество "КАМАЗ-Металлургия" | Control mode of process for manufacturing graphite and high-duty cast iron with globular and vermicular graphite for casting receiving |
| RU2341562C2 (en) * | 2006-12-15 | 2008-12-20 | Открытое акционерное общество "Косогорский металлургический завод" (ОАО "КМЗ") | Method of high-duty cast iron receiving |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1037518A (en) * | 1962-04-16 | 1966-07-27 | Combustion Eng | Method for producing cast iron resistant to heat growth |
| GB1126013A (en) * | 1966-05-24 | 1968-09-05 | Vanadium Corp Of America | Process for production of as-cast nodular iron |
| US3726670A (en) * | 1961-07-03 | 1973-04-10 | K Kusaka | Nodular graphite cast iron containing calcium,rare earth metals and magnesium and a method for its production |
| US3870512A (en) * | 1973-03-05 | 1975-03-11 | Deere & Co | Method of producing spheroidal graphite cast iron |
| SU465427A1 (en) * | 1973-01-16 | 1975-03-30 | Институт Проблем Литья Ан Украинской Сср | Complex modifier |
| EP0080590A2 (en) * | 1981-12-01 | 1983-06-08 | Goetze Ag | Wear-resistant cast iron containing spheroidal graphite, and process for its manufacture |
| EP0090654A2 (en) * | 1982-03-29 | 1983-10-05 | Elkem Metals Company | Alloy and process for producing ductile and compacted graphite cast irons |
| SU1475929A1 (en) * | 1987-01-08 | 1989-04-30 | Ростовский научно-исследовательский институт технологии машиностроения | Method of producing high-strength iron with spherical graphite |
| SU1638173A1 (en) * | 1988-07-29 | 1991-03-30 | Московское Производственное Объединение "Станколит" | Method of producing high-strength cast iron |
| RU2016079C1 (en) * | 1992-06-23 | 1994-07-15 | Акционерное общество "ГАЗ" | Method for production of high-strength cast iron |
-
2000
- 2000-01-21 RU RU2000101373A patent/RU2156809C1/en active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3726670A (en) * | 1961-07-03 | 1973-04-10 | K Kusaka | Nodular graphite cast iron containing calcium,rare earth metals and magnesium and a method for its production |
| GB1037518A (en) * | 1962-04-16 | 1966-07-27 | Combustion Eng | Method for producing cast iron resistant to heat growth |
| GB1126013A (en) * | 1966-05-24 | 1968-09-05 | Vanadium Corp Of America | Process for production of as-cast nodular iron |
| SU465427A1 (en) * | 1973-01-16 | 1975-03-30 | Институт Проблем Литья Ан Украинской Сср | Complex modifier |
| US3870512A (en) * | 1973-03-05 | 1975-03-11 | Deere & Co | Method of producing spheroidal graphite cast iron |
| EP0080590A2 (en) * | 1981-12-01 | 1983-06-08 | Goetze Ag | Wear-resistant cast iron containing spheroidal graphite, and process for its manufacture |
| EP0090654A2 (en) * | 1982-03-29 | 1983-10-05 | Elkem Metals Company | Alloy and process for producing ductile and compacted graphite cast irons |
| SU1475929A1 (en) * | 1987-01-08 | 1989-04-30 | Ростовский научно-исследовательский институт технологии машиностроения | Method of producing high-strength iron with spherical graphite |
| SU1638173A1 (en) * | 1988-07-29 | 1991-03-30 | Московское Производственное Объединение "Станколит" | Method of producing high-strength cast iron |
| RU2016079C1 (en) * | 1992-06-23 | 1994-07-15 | Акционерное общество "ГАЗ" | Method for production of high-strength cast iron |
Non-Patent Citations (1)
| Title |
|---|
| Высокопрочные чугуны для отливок /Под ред. д.т.н. Н.Н.Александрова. - М.: Машиностроение, 1982, с. 193. * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2188240C1 (en) * | 2001-04-19 | 2002-08-27 | Рушаник Борис Авсеевич | Method of high-strength cast iron production |
| RU2225885C2 (en) * | 2002-03-07 | 2004-03-20 | Открытое акционерное общество "Северсталь" | Method of production of graphitized conversion foundry pig iron |
| RU2315815C1 (en) * | 2006-04-07 | 2008-01-27 | Открытое акционерное общество "КАМАЗ-Металлургия" | Method for producing of vermiculate graphite cast-iron |
| RU2337973C2 (en) * | 2006-09-11 | 2008-11-10 | Открытое акционерное общество "КАМАЗ-Металлургия" | Control mode of process for manufacturing graphite and high-duty cast iron with globular and vermicular graphite for casting receiving |
| RU2341562C2 (en) * | 2006-12-15 | 2008-12-20 | Открытое акционерное общество "Косогорский металлургический завод" (ОАО "КМЗ") | Method of high-duty cast iron receiving |
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