CN1043754A - Spheroidal graphite cast iron - Google Patents

Spheroidal graphite cast iron Download PDF

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Publication number
CN1043754A
CN1043754A CN 88108791 CN88108791A CN1043754A CN 1043754 A CN1043754 A CN 1043754A CN 88108791 CN88108791 CN 88108791 CN 88108791 A CN88108791 A CN 88108791A CN 1043754 A CN1043754 A CN 1043754A
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CN
China
Prior art keywords
cast iron
iron
molybdenum
copper
manganese
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Application number
CN 88108791
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Chinese (zh)
Inventor
尼古拉·尼凯蒂维奇·亚历山大罗夫
亚历克赛·伊凡诺维奇·贝尔亚克夫
利奥尼德·佩特罗维奇·格里辛
瓦西里·伊凡诺维奇·库利克夫
盖奇克·吉柯莫维奇·奥屋米安
艾戈·亚历山大罗维奇·斯特雷克晓夫
萨金·亚历山大罗维奇·基乌奇里
阿纳托里·德米特里维奇·彭金
埃琳娜·伊凡诺娜·阿奇彭科娃
米克海尔·米克海尔罗维奇·安尼凯夫
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机械制造工艺科学生产联合公司
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Priority to CN 88108791 priority Critical patent/CN1043754A/en
Publication of CN1043754A publication Critical patent/CN1043754A/en

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Abstract

Spheroidal graphite cast iron contains carbon, silicon, manganese, chromium, aluminium, copper, calcium, magnesium and iron, and this cast iron also contains molybdenum and nickel simultaneously, the ratio of each component following (weight %): carbon 3.0-3.5, silicon 1.5-3.0, manganese 1.5-2.0, chromium 0.5-1.0, copper 1.0-1.5, calcium 0.003-0.070, magnesium 0.04-0.10, aluminium 0.3-0.50, molybdenum 0.25-0.40, nickel 2.0-3.5, iron surplus.

Description

The present invention relates to Foundry Production, more precisely, relate to spheroidal graphite cast iron.
But the present invention's ride high ground is used for making and bears the high-wearing machine parts, for example makes the foundry goods of the exposed gear engagement that is used for grinding equipment, and in automobile making and other field distinctive heavy-duty machine part.
Known a kind of spheroidal graphite cast iron (Giessereitechnik, 1980, O.Liesenberg " Hochfestes Gusseiren mit Kugelgraphit aufder Grundlage Von Vergutung ", S.359-363) contain carbon, silicon, manganese, nickel, copper, molybdenum, phosphorus and iron.
This cast iron has following chemical components (weight %):
Carbon 2.9-3.7
Silicon 1.9-2.4
Manganese 0.2-0.45
Nickel 0.1-6.6
Copper 0.01-2.3
Molybdenum 0.40-0.75
Phosphorus 0.02-0.05
Iron surplus.
This cast iron is used for thickness less than 150 millimeters foundry goods.
But above-mentioned cast iron has low wear resistance at thickness in greater than 150 millimeters foundry goods, and reason is to have formed pearlitic structure.
Above-mentioned situation is interpreted as lacking chromium and aluminium in cast iron composition.
In addition, low manganese content can not guarantee to obtain bainite-austenite structure at thickness in greater than 150 millimeters foundry goods, and the existence of this tissue can improve the wear resistance of cast iron.
Using above-mentioned cast iron to obtain thickness is impossible greater than 150 millimeters foundry goods because along with forming the perlite part in greater than 150 millimeters foundry goods at thickness, thickness less than 150 millimeters foundry goods in formed bainite structure begin to decompose.This perlite has partly reduced the wear resistance greater than 150 millimeters foundry goods.
Known another kind of spheroidal graphite cast iron (SU, A, 432223) contains carbon, silicon, manganese, chromium, aluminium, copper, magnesium, calcium and iron.
This cast iron has following chemical components and ratio of component (weight %):
Carbon 2.8-4.0
Silicon 1.5-3.0
Manganese 0-0.6
Chromium 0.5-2.5
Aluminium 0.5-3.0
Copper 0.2-2.0
Calcium 0.01-0.1
Magnesium 0.01-0.1
Iron surplus.
When the cast iron of the above-mentioned chemical ingredients of cooling, wherein form ferrite-pearlite-cementite tissue.Because the hardness of structural constituent is low, has low wear resistance so have the cast iron of this tissue.
In addition, the chromium content in the cast iron surpasses 1% can cause forming stable carbide, and it can worsen the use properties of cast iron.
This known cast iron belongs to the thermostability cast iron with soft and wear resistance.It can be used to make the pressing mold of glasswork, part of furnace installation or the like, and in these occasions, ferrite-pearlite-cementite tissue is optimal.
But, it is unsuitable bearing the high-wearing mechanical component with the cast iron manufacturing with this material property, because the part by this cast iron manufacturing will be subjected to the intense attrition effect when working, polishing scratch can appear, and because they may adhere to mutually rapidly and bite.
In addition, the existence of cementite in this structure of cast iron can make and meet difficulty when instrument is processed into part with cutting (blade).
The salient features of this cast iron is as follows: Brinell hardness 280-320; Ultimate tension 300-350 MPa; Wear resistance 90-100 gram/rice 3Hour.
According to the present invention proposes the task of making spheroidal graphite cast iron, this spheroidal graphite cast iron has such chemical ingredients and such composition ratio, and they can improve its wear resistance by obtaining bainite structure in thickness reaches 300 millimeters foundry goods.
Above-mentioned task is to solve like this, and this spheroidal graphite cast iron contains carbon, silicon, and manganese, chromium, copper, aluminium, calcium, magnesium and iron also contain molybdenum and nickel simultaneously according to the present invention, the ratio of each component following (weight %):
Carbon 3.0-3.5,
Silicon 1.5-3.0,
Manganese 1.5-2.0,
Chromium 0.5-1.0,
Copper 1.0-1.5,
Calcium 0.003-0.070,
Magnesium 0.04-0.10,
Aluminium 0.3-0.5,
Molybdenum 0.25-0.40,
Nickel 2.0-3.5,
Iron surplus.
Press mentioned component and each component ratio, when foundry goods cools off, can obtain to have the cast iron of bainite-austenite structure.This tissue can guarantee to improve wear resistance, intensity and the use properties of cast iron.Under the whole situations of composition, when can avoiding cooling off cast iron at a slow speed, the existence of molybdenum and nickel forms pearlitic structure according to aforementioned proportion.
In addition, add molybdenum and nickel with same suitable component ratio, cast iron can be cooled to bainite transformation temperature and isothermal when leaving standstill, prevent to form perlite at thickness in greater than 150 millimeters foundry goods, and guaranteeing that austenite decomposes with the formation of bainite structure, the result has significantly improved the wear resistance of cast iron.
Be preferably in this spheroidal graphite cast iron, carbon, silicon, copper, the relative manganese of percentage total content of al and ni, the ratio of the percentage total content of chromium and molybdenum equals 3.9-4.2: 1.
This per-cent of said components hinders the formation of carbide, and the bainite that carbide then hinders in the structure of cast iron forms, even austenite is stable.
Might be in spheroidal graphite cast iron carbon, silicon, copper, the relative manganese of percentage total content of al and ni, chromium, the ratio of the percentage total content of molybdenum equals 3.9-4.0: 1, at this moment each component should adopt following ratio (weight %):
Carbon 3.0-3.5,
Silicon 1.5-2.7,
Manganese 1.5-1.75,
Chromium 0.5-0.9,
Copper 1.0-1.3,
Calcium 0.003-0.070,
Magnesium 0.04-0.10,
Aluminium 0.3-0.45,
Molybdenum 0.25-0.33,
Nickel 2.3-3.5,
Iron surplus.
Aforementioned proportion causes remained austenite content increase in the structure of cast iron, and the result has reduced the hardness of cast iron and improved the machinability of the part of being made by this cast iron, and does not reduce its wear resistance.
Be preferably in carbon in the spheroidal graphite cast iron, silicon, copper, the relative manganese of percentage total content of al and ni, chromium, the ratio of the percentage total content of molybdenum equals 4.0-4.2: 1, at this moment each component should adopt following ratio (weight %):
Carbon 3.1-3.5,
Silicon 2.5-3.0,
Manganese 1.5-2.0,
Chromium 0.5-0.6,
Copper 1.3-1.5,
Calcium 0.003-0.007,
Magnesium 0.04-0.10,
Aluminium 0.4-0.5,
Molybdenum 0.3-0.4,
Nickel 2.0-3.5,
Iron surplus.
Aforementioned proportion causes remained austenite content minimizing in the structure of cast iron, and the bainite amount increases, and the result has improved the hardness and the wear resistance of cast iron.
In induction furnace, carry out the Castiron Melting of above-mentioned chemical ingredients, in induction furnace, pack into: waste iron, conversion pig, ferromanganese, ferrochrome, nickel, copper, molybdenum-iron, steel scrap, silicocalcium, aluminium.
For obtaining globular graphite, inoculation of Gray Iron is handled in airtight jar and is carried out.With magnesium, sodium aluminum fluoride and ferrosilicon pack into this jar in, again the melts that is obtained after induction furnace melting is poured in the jar.Equal 1450-1480 ℃ by the cast iron temperature of coming out in the stove.The interaction of above-mentioned nucleating agent takes place in jar, and forms the cast iron that contains globular graphite and have the mentioned component ratio.
Then the melts in the jar is injected mold, it produces crystallization therein, and the formation bainite structure is followed in cooling, and obtains to have the antifriction cast iron of above-mentioned chemical ingredients and ratio of component.
Confirm that carbon content can cause forming cementite less than 3% in structure of cast iron, promptly reduced when cooling obtaining the necessary austenitic quantity of bainite structure, the result reduces the wear resistance and the use properties of this Cast Iron Products.It is unfavorable that carbon content is increased to greater than 3.5%.Because this can cause forming perlite-troostite part in structure of cast iron, the result causes its wear resistance to reduce equally.
Silicone content causes in structure of cast iron forming a large amount of cementites less than 1.5%, and silicone content is increased to greater than 3% causes occurring amount of ferrite and perlite in tissue, and the result reduces the hardness of cast iron.In addition, the increase of silicone content causes the fragility of cast iron.All these have reduced its use properties and wear resistance.
Verified, when manganese content is in the 1.5-2.0% scope in the cast iron composition, can guarantee in thickness reaches 300 millimeters foundry goods, to obtain bainite-austenite structure.Manganese content can not guarantee to obtain bainite structure less than 1.5%, but produce sizable perlitic range, the result has reduced the wear resistance of cast iron, manganese content is higher than 2.0% increase that then causes cementite in the structure of cast iron, the result causes forming the crack when with cutting tool this cast iron being processed into part, causes that simultaneously cast iron is along embrittlement of grain boundaries.
Manganese content can reduce the eutectoid transformation temperature in above-mentioned scope, and promotes the quick austenitizing of structure of cast iron whereby.
In addition, the increase of manganese content causes cast iron along embrittlement of grain boundaries, because this increase promotes to form big martensite belt along crystal boundary, this be since manganese at these grain boundary segregations and slowed down the speed of bainite transformation at this place, its reason is that the velocity of diffusion of carbon is slowed down and austenitic stability improves.
Confirm through us, less than 0.5% o'clock, can not guarantee in the foundry goods of thickness 150-300 millimeter, to obtain bainite structure at chromium content.In addition, form ferrite around globular graphite, the result has sharply reduced the wear resistance of cast iron.
Chromium content was increased to greater than 1.0% o'clock in the cast iron, caused that in its tissue the carburizing scale of construction significantly increases, and caused then that greater than 5% martensite volume significantly increases, and martensite causes cast iron hardness to increase, thereby produced difficulty when causing with cutting tool its mechanical workout.
The molybdenum that adds 0.25-0.40% can reduce the critical cooling velocity of cast iron, improves the hardening capacity of alloy, and this is essential condition for obtaining bainite structure.The add-on of molybdenum causes occurring perlite less than 0.25% in cast iron, the result reduces its hardness and wear resistance, and molybdenum content is higher than 0.4% and causes carbide occurring along crystal boundary, and the result has reduced the strength property of cast iron.
Confirm that the nickel that adds 2.0-3.5% can reduce the critical cooling velocity of cast iron and improve its hardening capacity, this just allows the cross section is that 300 millimeters foundry goods obtains bainite structure after the normalizing process.Nickel content was less than 2.0% o'clock in the cast iron, and the foundry goods of above-mentioned thickness is all can not guarantee to obtain bainite structure at as-cast condition or in as-heat-treated condition, and the nickel amount is increased to greater than 3.5% from considering it is irrational economically.
When making spheroidal graphite cast iron, the copper that adds 1.0-1.5% in above-mentioned scope can obtain bainite structure, separates out and makes the residual austenite stabilization owing to suppressed the carbide in the bainite structure, thereby improved intensity, hardness and the wear resistance of cast iron.In addition, add copper and can suppress the manganese segregation in cast iron composition, promptly can not form carbide along crystal boundary, the result has improved the hardness and the wear resistance of cast iron.
Copper content is reduced to less than 1.0% and can not guarantees to obtain bainite structure in cast iron, because reduced the hardening capacity of cast iron, copper content then causes forming quasiflake graphite greater than 1.5%, and the result causes that the strength property of cast iron reduces.
The add-on of aluminium and calcium is corresponding to 0.3% and 0.003% o'clock, under the situation of the chromium of maximum and manganese content, can not prevent to form primary cementite, aluminium content greater than 5% and calcium contents greater than 0.7%, then under the situation of above-mentioned chromium and manganese content, can be observed the ferrite and the perlite of formation, the result has reduced the wear resistance of cast iron.
In order to obtain globular graphite, the composition of cast iron should have the residue Mg content of following scope: 0.04-0.1%(weight).
Mg content in the cast iron causes globular graphite not only occurring in structure of cast iron, and vermiform or flake graphite occur during less than lower limit 0.04, and the result sharply reduces its intensity and use properties.Mg content too much causes magnesium supersaturation in the cast iron, the same negative effects that produces of result with Mg content deficiency in the cast iron, so Mg content should not surpass upper limit 0.1%(weight).
Carbon, silicon, copper, the relative manganese of percentage total content of al and ni, the ratio of the percentage total content of chromium and molybdenum is (3.9-4.0): 1, can guarantee cementite quantity minimum in the structure of cast iron, this just improves its use properties.
Above-mentioned chemical ingredients is formed and the spheroidal graphite cast iron of ratio for having of obtaining like this, and can improve its wear resistance owing to obtain bainite structure in thickness reaches the foundry goods of 150-300 millimeter.
In order to understand the present invention better, concrete scheme of the present invention is implemented in narration below.
Embodiment 1
In induction furnace, carry out the melting of above-mentioned chemical ingredients cast iron, the following raw materials according of in stove, packing into (weight %), waste iron 30%, conversion pig 50%, ferromanganese 1.4%, ferrochrome 0.7%, nickel 3.2%, copper 1.0%, molybdenum-iron 0.38%, steel scrap 11.17%, silicocalcium 1%, aluminium 0.35%.
Be to obtain globular graphite, carry out inoculation of Gray Iron and handle in airtight jar, together in the totally 0.3% and 0.5% ferrosilicon tank filling, the melts that will obtain after the melting in induction furnace is poured in the jar with magnesium and sodium aluminum fluoride.The interaction of above-mentioned nucleating agent takes place in jar, and the result forms spheroidal graphite cast iron.
Then the melts that will obtain carries out the crystallization and the cooling of cast iron there by injecting mold in the jar, follows the formation bainite structure.
The antifriction cast iron of Huo Deing has following chemical components and ratio of component (weight %) like this: carbon 3.0, silicon 1.5, manganese 1.5, chromium 0.5, copper 1.0, calcium 0.003, magnesium 0.04, aluminium 0.3, molybdenum 0.25, nickel 3.2, carbon wherein, silicon, copper, aluminium, the relative manganese of percentage total content of nickel, chromium, the ratio of the percentage total content of molybdenum is 4: 1.The cast iron that is obtained has following use properties: hardness HB388, wear resistance 8.89 gram/rice 3Hour.
Embodiment 2
In induction furnace, carry out the Castiron Melting of above-mentioned chemical ingredients, the following raw material (weight %) of in stove, packing into: waste iron 30%, conversion pig 61%, ferromanganese 1.35%, ferrochrome 0.8%, nickel 2.7%, copper 1.0%, molybdenum-iron 0.4%, silicocalcium 1.6%, aluminium 0.35%.
In closed tin, carry out the inoculation of Gray Iron processing for obtaining globular graphite.Magnesium and sodium aluminum fluoride totally 0.3% and 0.5% the ferrosilicon together of packing in this jar, the melts that will be obtained after the melting in induction furnace is poured in the jar.The interaction of above-mentioned nucleating agent takes place in jar, and the result forms spheroidal graphite cast iron.
Then the melts that will be obtained produces crystallization and cooling therein by injecting mold in the jar, follows the formation bainite structure.
The antifriction cast iron of Huo Deing has following chemical components and each ratio of component (weight %) like this: carbon 3.5, silicon 1.5, manganese 1.5, chromium 0.5, copper 1.0, calcium 0.005, magnesium 0.06, aluminium 0.3, molybdenum 0.25, nickel 2.7, carbon wherein, silicon, copper, the relative manganese of percentage total content of al and ni, chromium, the ratio of the percentage total content of molybdenum is 4: 1.The cast iron that is obtained has following use properties: hardness HB400, wear resistance 8.06 gram/rice 2Hour.
Embodiment 3
In induction furnace, carry out the Castiron Melting of above-mentioned chemical ingredients, the following raw material (weight %) of in stove, packing into: waste iron 30%, conversion pig 59%, ferromanganese 2%, ferrochrome 0.84%, nickel 3.0%, copper 1.5%, molybdenum-iron 0.46%, silicocalcium 2.0%, aluminium 0.4%.
In sealed can, carry out inoculation of Gray Iron and handle for obtaining globular graphite, with magnesium and sodium aluminum fluoride together totally 0.3% and 0.5% ferrosilicon pack in this jar, the melts that will be obtained after the melting in induction furnace is poured in the jar again.The interaction of above-mentioned nucleating agent takes place in jar.The result forms spheroidal graphite cast iron.
Then with the melts that obtained by injecting mold in the jar, produce the crystallization and the cooling of cast iron therein, follow the formation bainite structure.
The antifriction cast iron of Huo Deing has following chemical components and each ratio of component (weight %) like this: carbon 3.5, silicon 2.5, manganese 1.8, chromium 0.6, copper 1.5, calcium 0.008, magnesium 0.08, aluminium 0.4, molybdenum 0.3, nickel 3.0, carbon wherein, silicon, copper, the percentage total content of al and ni is with respect to manganese, chromium, and the ratio of the percentage total content of molybdenum is 4: 1.The cast iron that is obtained has following use properties: hardness HB388; Wear resistance 8.89 gram/rice 2Hour.
Embodiment 4
In induction furnace, carry out the Castiron Melting of above-mentioned chemical ingredients, following raw material is packed into (weight %) in the stove: waste iron 30%, conversion pig 59%, ferromanganese 1.3%, ferrochrome 0.7%, nickel 2.0%, copper 1.5%, molybdenum-iron 0.6%, steel scrap 1.75%, silicocalcium 1.8%, aluminium 0.55%.
In sealed can, carry out the inoculation of Gray Iron processing for obtaining globular graphite.With magnesium and sodium aluminum fluoride together totally 0.3% and 0.5% ferrosilicon pack in this jar, the melts that will be obtained after induction furnace melting is poured in this jar again.The interaction of above-mentioned nucleating agent takes place in jar.The result forms spheroidal graphite cast iron.
By injecting mold in the jar, carry out crystallization and cooling therein promptly and with the melts that obtained, follow the formation bainite structure.
The antifriction cast iron of Huo Deing has following chemical components and each ratio of component (weight %) like this: carbon 3.5, silicon 2.5, manganese 1.5, chromium 0.5, copper 1.5, calcium-0.070, magnesium-0.09, aluminium-0.5, molybdenum 0.4, nickel 2.0, carbon wherein, silicon, copper, the relative manganese of percentage total content of al and ni, chromium, the ratio of the percentage total content of molybdenum is 4.2: 1.The cast iron that is obtained has following use properties: hardness HB387, wear resistance 8.96 gram/rice 2Hour.
Embodiment 5
In induction furnace, carry out the Castiron Melting of above-mentioned chemical ingredients, the following raw materials according of in stove, packing into (weight %): waste iron 30%, conversion pig 60%, ferromanganese 1.3%, ferrochrome 1.47%, nickel 2.5%, copper 1.0%, molybdenum-iron 0.38%, silicocalcium 2.0%, aluminium 0.55%.
In sealed can, carry out inoculation of Gray Iron and handle for obtaining globular graphite, with magnesium and sodium aluminum fluoride together totally 0.3% and 5% ferrosilicon pack in this jar, the melts that will obtain after the melting in induction furnace is poured in this jar again.The interaction of above-mentioned nucleating agent takes place in jar, and the result forms spheroidal graphite cast iron.
Then with the melts that obtains by injecting mold in the jar, carry out crystallization and cooling therein, follow the formation bainite structure.
The antifriction cast iron of Huo Deing has following chemical ingredients and ratio of component (weight %) like this: carbon 3.5, silicon 3.0, manganese 1.5, chromium 1.0, copper 1.0, calcium 0.0070, magnesium 0.07, aluminium 0.5, molybdenum 0.25, nickel 2.5, carbon wherein, silicon, copper, the relative manganese of percentage total content of al and ni, chromium, the ratio of the percentage total content of molybdenum is 4: 1.Gained cast iron has following use properties: hardness HB421, wear resistance 6.62 gram/rice 2Hour.
Embodiment 6
In induction furnace, carry out the Castiron Melting of above-mentioned chemical ingredients, the following raw material (weight %) of in stove, packing into: waste iron 30%, conversion pig 51%, ferromanganese 2.4%, ferrochrome 0.7%, nickel 3.5%, copper 1.5%, molybdenum-iron 0.6%, steel scrap 7.45%, silicocalcium 1.5%, aluminium 0.55%.
In sealed can, carry out the inoculation of Gray Iron processing for obtaining globular graphite.With magnesium and sodium aluminum fluoride together totally 0.3% and 0.5% ferrosilicon pack in this jar, the melts that will obtain after the melting in induction furnace is poured in this jar again.The interaction of above-mentioned nucleating agent takes place in jar, and the result forms spheroidal graphite cast iron.
Then with the melts of gained by injecting mold in the jar, carry out crystallization and cooling therein, follow the formation bainite structure.
The antifriction cast iron of Huo Deing has following chemical components and ratio of component (weight %) like this: carbon 3.1, silicon 3.0, manganese 2.0, chromium 0.5, copper 1.5, calcium 0.050, magnesium 0.065, aluminium 0.5, molybdenum 0.40, nickel 3.5, carbon wherein, silicon, copper, the relative manganese of percentage total content of al and ni, chromium, the ratio of the percentage total content of molybdenum is 4: 1.Gained cast iron has following use properties: hardness HB355, wear resistance 11.2 gram/rice 2Hour.
Embodiment 7
In induction furnace, carry out the Castiron Melting of above-mentioned chemical ingredients, the following raw material (weight %) of in stove, packing into: waste iron 30%, conversion pig 58%, ferromanganese 1.3%, ferrochrome 1.47%, nickel 3.5%, copper 1.3%, molybdenum-iron 0.6%, steel scrap 0.68%, silicocalcium 1.9%, aluminium 0.45%.
In sealed can, carry out the inoculation of Gray Iron processing for obtaining globular graphite.With magnesium and sodium aluminum fluoride together totally 0.3% and 0.5% ferrosilicon pack in this jar, the melts that will be obtained after the melting in induction furnace is poured in this jar again.The interaction of above-mentioned nucleating agent takes place in jar.The result forms spheroidal graphite cast iron.
Then with the melts that obtained by injecting mold in the jar, carry out crystallization and cooling therein, follow the formation bainite structure.
The antifriction cast iron of Huo Deing has following chemical ingredients and ratio of component (weight %) like this: carbon 3.5, silicon 2.6, manganese 1.5, chromium 1.0, copper 1.3, calcium 0.070, magnesium 0.075, aluminium 0.4, molybdenum 0.4, nickel 3.5, carbon wherein, silicon, copper, the relative manganese of percentage total content of al and ni, chromium, the ratio of the percentage total content of molybdenum is that the cast iron that is obtained at 3.9: 1 has following use properties: hardness HB410, wear resistance 7.38 gram/rice 2Hour.
Embodiment 8
In induction furnace, carry out the Castiron Melting of above-mentioned chemical ingredients, the following raw materials according of in stove, packing into (weight %): waste iron 30%, conversion pig 58%, ferromanganese 2.0%, ferrochrome 1.0%, nickel 3.3%, copper 1.4%, molybdenum-iron 0.5%, steel scrap 0.85%, silicocalcium 1.7%, aluminium 0.45%.
In sealed can, carry out the inoculation of Gray Iron processing for obtaining globular graphite.Magnesium and sodium aluminum fluoride together totally 0.3% and 0.5% ferrosilicon pack into this jar in, the melts that will be obtained after the melting in induction furnace is poured in this jar again.The interaction of above-mentioned nucleating agent takes place in jar.The result forms spheroidal graphite cast iron.
Then with the melts that obtained by injecting mold in the jar, carry out crystallization and cooling therein, follow the formation bainite structure.
The antifriction cast iron of Huo Deing has following chemical ingredients and ratio of component (weight %) like this: carbon 3.4, silicon 2.8, manganese 1.75, chromium 0.75, copper 1.4, calcium 0.055, magnesium 0.085, aluminium 0.45, molybdenum 0.33, nickel 3.3, carbon wherein, silicon, copper, aluminium, the relative manganese of percentage total content of nickel, chromium, the ratio of the percentage total content of molybdenum is 4: 1.The cast iron that is obtained has following use properties: hardness HB390, wear resistance 8.75 gram/rice 2Hour.
Embodiment 9
In induction furnace, carry out the Castiron Melting of above-mentioned chemical ingredients, the following raw material (weight %) of in stove, packing into: waste iron 30%, conversion pig 55%, ferromanganese 1.85, ferrochrome 0.70%, nickel 3.1%, copper 1.2%, molybdenum-iron 0.54%, steel scrap 4.8%, silicocalcium 1.6%, aluminium 0.4%.
In sealed can, carry out the inoculation of Gray Iron processing for obtaining globular graphite.Magnesium and sodium aluminum fluoride together totally 0.3% and 0.5% ferrosilicon pack into this jar in, the melts that will be obtained after the melting in induction furnace is poured in this jar again.The interaction of above-mentioned nucleating agent takes place in jar.The result forms spheroidal graphite cast iron.
Then with the melts that obtained by injecting mold in the jar, carry out crystallization and cooling therein, follow the formation bainite structure.
The antifriction cast iron of Huo Deing has following chemical ingredients and ratio of component (weight %) like this: carbon 3.2, silicon 2.0, manganese 1.6, chromium 0.5, copper 1.2, calcium 0.020, magnesium 0.09, aluminium 0.35, molybdenum 0.35, nickel 3.1, carbon wherein, silicon, copper, aluminium, the relative manganese of percentage total content of nickel, chromium, the ratio of the percentage total content of molybdenum is 41.The cast iron that is obtained has following use properties: hardness HB380, wear resistance 9.44 gram/rice 2Hour.
Embodiment 10
In induction furnace, carry out the Castiron Melting of above-mentioned chemical ingredients, the following raw material (weight %) of in stove, packing into: waste iron 30%, conversion pig 50%, ferromanganese 1.7%, ferrochrome 1.24%, nickel 2.3%, copper 1.15%, molybdenum-iron 0.31%, steel scrap 10.0%, silicocalcium 2.0%, aluminium 0.5%.
In sealed can, carry out the inoculation of Gray Iron processing for obtaining globular graphite.Magnesium and sodium aluminum fluoride together totally 0.3% and 0.5% ferrosilicon pack into this jar in, the melts that will be obtained after the melting in induction furnace is poured in this jar again.The interaction of above-mentioned nucleating agent takes place in jar.The result forms spheroidal graphite cast iron.
Then with the melts that obtained by injecting mold in the jar, carry out crystallization and cooling therein, follow the formation bainite structure.
The antifriction cast iron of Huo Deing has following chemical ingredients and ratio of component (weight %) like this: carbon 3.5, silicon 2.7, manganese 1.5, chromium 0.9, copper 1.15, calcium 0.070, magnesium 0.055, aluminium 0.45, molybdenum 0.25, nickel 2.3, carbon wherein, silicon, copper, aluminium, the relative manganese of percentage total content of nickel, chromium, the ratio of the percentage total content of molybdenum is 3.9: 1.The cast iron that is obtained has following use properties: hardness HB420, wear resistance 6.7 gram/rice 2Hour.
By the foregoing description as can be known, the cast iron that is obtained has high-wearing feature and high strength.

Claims (4)

1, spheroidal graphite cast iron contains carbon, silicon, and manganese, chromium, aluminium, copper, calcium, magnesium and iron is characterized in that, it also contains molybdenum and nickel simultaneously, the ratio of each component following (weight %):
Carbon 3.0-3.5,
Silicon 1.5-3.0,
Manganese 1.5-2.0,
Chromium 0.5-1.0,
Copper 1.0-1.5,
Calcium 0.003-0.070,
Magnesium 0.04-0.10,
Aluminium 0.3-0.50,
Molybdenum 0.25-0.40,
Nickel 2.0-3.5,
Iron surplus.
2, according to the spheroidal graphite cast iron of claim 1, it is characterized in that, carbon, silicon, copper, the relative manganese of percentage total content of al and ni, the ratio of the percentage total content of chromium and molybdenum is 3.9-4.2: 1.
3, according to the spheroidal graphite cast iron of claim 1, it is characterized in that, carbon, silicon, copper, the relative manganese of the relative content of al and ni, the ratio of the percentage total content of chromium and molybdenum is
3.9-4.0: 1, this moment, each component adopted following ratio (weight %):
Carbon 3.0-3.5,
Silicon 1.5-2.7,
Manganese 1.5-1.75,
Chromium 0.5-0.9,
Copper 1.0-1.3,
Calcium 0.003-0.070,
Magnesium 0.04-0.10,
Aluminium 0.3-0.45,
Molybdenum 0.25-0.33,
Nickel 2.3-3.5,
Iron surplus.
4, according to the spheroidal graphite cast iron of claim 1, it is characterized in that, carbon, silicon, copper, the relative manganese of percentage total content of al and ni, chromium, the ratio of the percentage total content of molybdenum is
4.0-4.2: 1, this moment, each component adopted following ratio (weight %):
Carbon 3.1-3.5,
Silicon 2.5-3.0,
Manganese 1.5-2.0,
Chromium 0.5-0.6,
Copper 1.3-1.5,
Calcium 0.003-0.070,
Magnesium 0.04-0.10,
Aluminium 0.4-0.5,
Molybdenum 0.3-0.4,
Nickel 2.0-3.5,
Iron surplus.
CN 88108791 1988-12-21 1988-12-21 Spheroidal graphite cast iron CN1043754A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1053398C (en) * 1993-12-30 2000-06-14 北京科技大学 Process for rolling white iron blades of ball thrower
CN100340689C (en) * 2002-01-14 2007-10-03 乔治费希尔汽车技术有限公司 Nodular graphite iron alloy
CN100529135C (en) * 2004-11-22 2009-08-19 乔治·费希尔汽车股份公司 Spheroidal cast alloy and method for producing cast parts from said spheroidal cast alloy
CN102080178B (en) * 2004-02-08 2012-12-19 昆明理工大学 Quasi-casting high toughness bainitic low-carbon ductile iron and producing method thereof
CN102851574A (en) * 2012-09-24 2013-01-02 苏州东海玻璃模具有限公司 Heatproof alloy vermicular cast iron and method for preparing same
US10266927B2 (en) * 2012-07-23 2019-04-23 Ferry Capitain Alloy, corresponding part and manufacturing method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1053398C (en) * 1993-12-30 2000-06-14 北京科技大学 Process for rolling white iron blades of ball thrower
CN100340689C (en) * 2002-01-14 2007-10-03 乔治费希尔汽车技术有限公司 Nodular graphite iron alloy
CN102080178B (en) * 2004-02-08 2012-12-19 昆明理工大学 Quasi-casting high toughness bainitic low-carbon ductile iron and producing method thereof
CN100529135C (en) * 2004-11-22 2009-08-19 乔治·费希尔汽车股份公司 Spheroidal cast alloy and method for producing cast parts from said spheroidal cast alloy
US10266927B2 (en) * 2012-07-23 2019-04-23 Ferry Capitain Alloy, corresponding part and manufacturing method
CN102851574A (en) * 2012-09-24 2013-01-02 苏州东海玻璃模具有限公司 Heatproof alloy vermicular cast iron and method for preparing same
CN102851574B (en) * 2012-09-24 2014-07-23 苏州东海玻璃模具有限公司 Heatproof alloy vermicular cast iron and method for preparing same

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