CN110760740A - Silicon solid solution reinforced ferrite nodular cast iron and preparation method thereof - Google Patents
Silicon solid solution reinforced ferrite nodular cast iron and preparation method thereof Download PDFInfo
- Publication number
- CN110760740A CN110760740A CN201810831628.4A CN201810831628A CN110760740A CN 110760740 A CN110760740 A CN 110760740A CN 201810831628 A CN201810831628 A CN 201810831628A CN 110760740 A CN110760740 A CN 110760740A
- Authority
- CN
- China
- Prior art keywords
- percent
- content
- iron
- less
- equal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
- C21C1/105—Nodularising additive agents
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The silicon solid solution reinforced ferrite nodular cast iron comprises the following components in percentage by mass: 3.3 to 3.7 percent of C, 3.5 to 4.2 percent of Si, less than or equal to 0.25 percent of Mn, 0.04 to 0.06 percent of Mg, less than or equal to 0.035 percent of P, less than or equal to 0.015 percent of S, 0.042 to 0.058 percent of Ce, 0.008 to 0.012 percent of Sb, 0.012 to 0.016 percent of Bi, less than or equal to 0.05 percent of Ca and the balance of Fe. According to the invention, the size of graphite nodules is reduced by adding Bi, the nodularity of graphite is improved and the phenomenon of broken graphite is reduced by adding Ce, Sb and Bi elements and controlling the adding proportion, and the high strength, high elongation and good impact resistance of a large-section casting are realized by high-silicon solid solution strengthening of ferrite nodular cast iron; the technical scheme of the invention has the advantages of simple production process, low cost and easy realization of industrial production.
Description
Technical Field
The invention relates to the field of preparation of ferritic nodular cast iron, in particular to silicon solid solution strengthened ferritic nodular cast iron and a preparation method thereof.
Background
Due to the development of wind power technology, wind power generation projects are supported greatly all over the world. With the development of wind turbine projects around the world, the geographical conditions selected as wind farms become increasingly severe. As a core component in wind power projects: the parts such as the hub, the base, the shaft and the like are made of ferrite nodular cast iron materials which are selected along with the severe geographical conditions, and the performance requirements are higher.
Many wind power ferrite nodular cast iron parts are large in section (the wall thickness is larger than 60mm), however, due to slow cooling speed and long eutectic solidification time, the large-section nodular cast iron is easy to generate broken block-shaped graphite in the cooling process, which is shown in the fact that macroscopic gray spot fractures appear at the center of a thick-wall nodular iron part, the microstructure of the large-section nodular cast iron is the broken block-shaped graphite and a ferrite matrix, and the microstructure can obviously reduce the performances of the nodular iron such as tensile strength, elongation and impact power.
The invention patent CN 103710612A discloses a production method of an as-cast ferrite-based nodular cast iron QT600-10, and the invention patent CN104120332A discloses a high-strength high-toughness nodular cast iron 600-10 and a production process thereof, the elongation of the nodular cast iron produced by the technical schemes of the two patents is low, and the technical scheme does not provide a solution aiming at the strength and the elongation of a large-section casting.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide the silicon solid solution strengthened ferritic nodular cast iron and the preparation method thereof, so that the strength and the elongation of the prepared large-section ferritic nodular cast iron are improved, and the large-section ferritic nodular cast iron has good impact resistance.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the silicon solid solution strengthening ferritic nodular cast iron comprises the following elements in percentage by mass: 3.3 to 3.7 percent of C, 3.5 to 4.2 percent of Si, less than or equal to 0.25 percent of Mn, 0.04 to 0.06 percent of Mg, less than or equal to 0.035 percent of P, less than or equal to 0.015 percent of S, 0.042 to 0.058 percent of Ce, 0.008 to 0.012 percent of Sb, 0.012 to 0.016 percent of Bi, less than or equal to 0.05 percent of Ca and the balance of Fe.
A preparation method of silicon solid solution reinforced ferritic nodular cast iron comprises the following steps:
(1) adding pig iron and scrap steel into a medium-frequency induction furnace, heating to 1420-1480 ℃ for melting, detecting the content of carbon in the molten iron after all the molten iron is melted, and adjusting the content of C to 3.3-3.7% to form original molten iron;
(2) spheroidizing the molten iron by using a flushing method, wherein the adding amount of a spheroidizing agent is 1.0-2.0% of the weight of the original molten iron, when the spheroidizing agent is tight during preparation of a spheroidizing bag, 75 ferrosilicon with the weight of 0.3-0.4% of the weight of the original molten iron and an inoculant a with the particle size of 3-8 mm are uniformly covered above the spheroidizing agent, and elements Ce and Sb are added during spheroidizing, so that the content of Ce after spheroidizing is 0.042-0.058%, the content of Sb is 0.008-0.012%, and the adding amount of the inoculant a is 0.5-0.8% of the weight of the original molten iron;
(3) stream inoculation is carried out during pouring, the adding amount of a stream inoculant b is 0.25-0.30 percent of the weight of the original molten iron, and the pouring temperature of the molten iron is 1360-1380 ℃;
(4) and cooling the molten iron to obtain the silicon solid solution strengthened ferrite nodular cast iron.
Furthermore, the P content of the pig iron is less than or equal to 0.03%, the S content is less than or equal to 0.015%, the P content of the waste iron is less than or equal to 0.035%, the S content is less than or equal to 0.015%, and the Mn content is less than or equal to 0.25%.
Further, the adding ratio of the pig iron to the scrap steel is (6-7) to (3-4).
Further, the nodulizer comprises 0.3-0.5% of Ce, 2.5-4.0% of Mg, 40.0-45.0% of Si, 0.5-0.8% of Ca and the balance of Fe.
Further, the inoculant a contains 65.0-75.0% of Si, 0.3-0.5% of Bi and the balance of iron; the content of Si in the inoculant b is 65.0-75.0%, the content of Bi is 0.3-0.5%, the balance is iron, and the particle size of the inoculant b is 1-2 mm.
Si is an element promoting graphite spheroidization, the content of silicon is increased in a proper range, and the silicon is dissolved in ferrite lattices in a solid mode, so that the tensile strength and the hardness of the nodular cast iron are effectively improved, and the toughness of the nodular cast iron is reduced, the content of Si is controlled to be 3.5-4.2% in the technical scheme, and the elongation, the strength and the impact resistance are favorably improved; the use of trace elements such as Cu, Ni, Sn, Mo, Cr and the like is reduced by high-silicon solid solution strengthening.
In order to inhibit the formation of the blocky graphite, Ce and Sb elements are added during spheroidization in the technical scheme, Sb is rare earth which interferes with the spheroidization of the graphite, and when magnesium alloy is selected as a spheroidizing agent, the content of Sb is 0.008-0.012%, the spheroidization effect is realized on a large-section casting instead, so that the number of graphite balls is increased. In addition, Sb and added Ce are easy to form a high-melting-point stable compound and further serve as a heterogeneous core of the nodular graphite, the number of graphite spheres is increased, and when the Sb content is higher than 0.012%, the phenomenon of broken graphite is increased and is increased along with the increase of the Sb content.
Magnesium is a nodulizer with good nodulizing effect, but the magnesium explosion phenomenon is easy to occur when a single magnesium nodulizer is used for nodulizing, particularly when a large-section casting is prepared. In order to protect the lasting spheroidization effect of the magnesium element in the spheroidization process, the Ce element is added when the spheroidizing agent is added, but the content of the Ce is not easy to be too high. In order to reduce the magnesium explosion phenomenon, an inoculant containing Bi is adopted to reduce the magnesium explosion problem by reducing the size of graphite nodules and promoting the formation of ferrite.
The beneficial effects of the invention include:
according to the invention, the size of graphite nodules is reduced by adding Bi, the nodularity of graphite is improved and the phenomenon of broken graphite is reduced by adding Ce, Sb and Bi elements and controlling the adding proportion, and the high strength, high elongation and good impact resistance of a large-section casting are realized by high-silicon solid solution strengthening ferrite nodular cast iron; the technical scheme of the invention has the advantages of simple production process, low cost and easy realization of industrial production.
Detailed Description
The present invention will be further described with reference to examples, but the present invention is not limited to these examples.
Example 1
A2.5 MW wind power bearing end cover casting is selected for trial production, the base is 16 tons per unit weight, the main wall thickness is 80-120mm, and the preparation steps are as follows:
(1) adding pig iron and scrap steel into a medium-frequency induction furnace, heating to 1420 ℃ for melting, detecting the content of carbon in the molten iron after all the molten iron is melted, and adjusting the content of C to 3.3% to form original molten iron;
wherein the adding ratio of the pig iron to the scrap steel is 6:4,
wherein the P content of the pig iron is less than or equal to 0.03 percent, the S content is less than or equal to 0.015 percent, the P content of the waste iron is less than or equal to 0.035 percent, the S content is less than or equal to 0.015 percent, and the Mn content is less than or equal to 0.3 percent;
(2) spheroidizing the molten iron by using a flushing method, wherein the adding amount of a spheroidizing agent is 1.5 percent of the weight of the original molten iron, and when the spheroidizing agent is tight during preparation of a spheroidizing ladle, 75 ferrosilicon with the weight of 0.5 percent of the weight of the original molten iron and an inoculant a with the particle size of 3-4 mm are uniformly covered above the spheroidizing agent; adding Ce and Sb elements while spheroidizing to ensure that the content of Ce is 0.042 percent and the content of Sb is 0.01 percent after spheroidizing; the addition amount of the inoculant a is 0.8 percent of the weight of the original iron liquid;
wherein, the content of Ce in the nodulizer is 0.3 percent, the content of Mg is 3 percent, the content of Si is 45.0 percent, the content of Ca is 0.65 percent, and the rest is iron;
wherein the content of Si in the inoculant a is 70.0 percent, the content of Bi is 0.4 percent, and the balance is iron;
(3) stream inoculation is carried out during pouring, and the adding amount of the stream inoculant b is 0.25 percent of the weight of the original iron liquid; the pouring temperature of the molten iron is 1370 ℃;
wherein the content of Si in the inoculant b is 75.0 percent, the content of Bi is 0.3 percent, the balance is iron, and the grain diameter of the inoculant b is 1-2 mm;
(4) and cooling the molten iron to obtain the silicon solid solution strengthened ferrite nodular cast iron.
The silicon solid solution strengthened ferritic nodular cast iron prepared according to the steps comprises the following element components in percentage by mass: 3.3 percent of C, 3.8 percent of Si, less than or equal to 0.25 percent of Mn, 0.06 percent of Mg, less than or equal to 0.035 percent of P, less than or equal to 0.015 percent of S, 0.042 percent of Ce, 0.01 percent of Sb, 0.012 percent of Bi, less than or equal to 0.05 percent of Ca and the balance of Fe.
The performances of the single casting test block and the 70mm thick auxiliary casting test block at the position of 120mm of the wall thickness of the casting of the 2.5MW wind power bearing end cover casting prepared by the method of the embodiment are respectively as follows: the tensile strength is 615MPa and 567MPa, the yield strength is 489MPa and 460MPa, the elongation is 21.2 percent and 19.7 percent, the impact value at minus 20 ℃ is 14.7J and 15.6J, and the nodularity is 96 percent and 94 percent.
Example 2
A2.5 MW wind power bearing end cover casting is selected for trial production, the weight of the bearing end cover is 0.8 ton per unit, the main wall thickness is 100-220mm, and the preparation steps are as follows:
(1) adding pig iron and scrap steel into a medium-frequency induction furnace, heating to 1480 ℃ for melting, detecting the content of carbon in the molten iron after all the molten iron is melted, and adjusting the content of C to 3.5% to form original molten iron;
wherein the adding ratio of the pig iron to the scrap steel is 7:3,
wherein the P content of the pig iron is less than or equal to 0.03 percent, the S content is less than or equal to 0.015 percent, the P content of the waste iron is less than or equal to 0.035 percent, the S content is less than or equal to 0.015 percent, and the Mn content is less than or equal to 0.3 percent.
(2) Spheroidizing the molten iron by using a flushing method, wherein the adding amount of a spheroidizing agent is 1.0 percent of the weight of the original molten iron, and when the spheroidizing agent is tight during preparation of a spheroidizing ladle, 75 ferrosilicon with the weight of 0.3 percent of the weight of the original molten iron and an inoculant a with the particle size of 7-8 mm are uniformly covered above the spheroidizing agent; adding Ce and Sb elements during spheroidization to ensure that the content of Ce is 0.058 percent and the content of Sb is 0.008 percent after spheroidization; the addition amount of the inoculant a is 0.5 percent of the weight of the original iron liquid;
wherein, the nodulizer contains 0.4 percent of Ce, 4 percent of Mg, 42 percent of Si, 0.5 percent of Ca and the balance of Fe;
wherein the content of Si in the inoculant a is 75.0 percent, the content of Bi is 0.3 percent, and the balance is iron;
(3) stream inoculation is carried out during pouring, and the adding amount of the stream inoculant b is 0.28 percent of the weight of the original iron liquid; the casting temperature of the molten iron is 1380 ℃;
wherein the content of Si in the inoculant b is 65.0 percent, the content of Bi is 0.4 percent, the balance is iron, and the grain diameter of the inoculant b is 1-2 mm;
(4) and cooling the molten iron to obtain the silicon solid solution strengthened ferrite nodular cast iron.
The silicon solid solution strengthened ferritic nodular cast iron prepared according to the steps comprises the following element components in percentage by mass: 3.5 percent of C, 3.5 percent of Si, less than or equal to 0.25 percent of Mn, 0.04 percent of Mg, less than or equal to 0.035 percent of P, less than or equal to 0.015 percent of S, 0.058 percent of Ce, 0.008 percent of Sb, 0.014 percent of Bi, less than or equal to 0.05 percent of Ca and the balance of Fe.
The performances of the single casting test block and the 70mm thick attached casting test block at the 185mm position of the casting wall thickness of the 2.5MW wind power bearing end cover casting prepared by the method of the embodiment are respectively as follows: the tensile strength is 601MPa, 559MPa, the yield strength is 472MPa, 447MPa, the elongation is 20.2%, 19.3%, the impact value at minus 20 ℃ is 14.9J, 15.8J, and the nodularity is 95%, 96%.
Example 3
A2.5 MW wind power bearing end cover casting is selected for trial production, the weight of the bearing end cover is 0.8 ton per unit, the main wall thickness is 100-220mm, and the preparation steps are as follows:
(1) adding pig iron and scrap steel into a medium-frequency induction furnace, heating to 1460 ℃ for melting, detecting the content of carbon in the molten iron after all the molten iron is melted, and adjusting the content of C to 3.7% to form original molten iron;
wherein the adding ratio of the pig iron to the scrap steel is 6.5:3.5,
wherein the P content of the pig iron is less than or equal to 0.03 percent, the S content is less than or equal to 0.015 percent, the P content of the waste iron is less than or equal to 0.035 percent, the S content is less than or equal to 0.015 percent, and the Mn content is less than or equal to 0.3 percent.
(2) Spheroidizing the molten iron by using a flushing method, wherein the adding amount of a spheroidizing agent is 2.0 percent of the weight of the original molten iron, and when the spheroidizing agent is tight during preparation of a spheroidizing ladle, 75 ferrosilicon with the weight of 0.4 percent of the weight of the original molten iron and an inoculant a with the particle size of 5-6 mm are uniformly covered above the spheroidizing agent; adding Ce and Sb elements while spheroidizing to ensure that the content of Ce is 0.05 percent and the content of Sb is 0.012 percent after spheroidizing; the addition amount of the inoculant a is 0.65 percent of the weight of the original iron liquid;
wherein, the content of Ce in the nodulizer is 0.5 percent, the content of Mg is 2.5 percent, the content of Si is 40.0 percent, the content of Ca is 0.8 percent, and the rest is iron;
wherein the content of Si in the inoculant a is 65.0 percent, the content of Bi is 0.5 percent, and the balance is iron;
(3) stream inoculation is carried out during pouring, and the adding amount of the stream inoculant b is 0.30 percent of the weight of the original iron liquid; the pouring temperature of the molten iron is 1360 ℃;
wherein the content of Si in the inoculant b is 70%, the content of Bi is 0.5%, the balance is iron, and the grain diameter of the inoculant b is 1-2 mm;
(4) and cooling the molten iron to obtain the silicon solid solution strengthened ferrite nodular cast iron.
The silicon solid solution strengthened ferritic nodular cast iron prepared according to the steps comprises the following element components in percentage by mass: 3.7 percent of C, 4.2 percent of Si, less than or equal to 0.25 percent of Mn, 0.05 percent of Mg, less than or equal to 0.035 percent of P, less than or equal to 0.015 percent of S, 0.05 percent of Ce, 0.012 percent of Sb, 0.016 percent of Bi, less than or equal to 0.05 percent of Ca and the balance of Fe.
The performances of the single casting test block and the 70mm thick attached casting test block at the 185mm position of the casting wall thickness of the 2.5MW wind power bearing end cover casting prepared by the method of the embodiment are respectively as follows: the tensile strength is 598MPa and 556MPa, the yield strength is 469MPa and 442MPa, the elongation is 19.8 percent and 18.9 percent, the impact value at minus 20 ℃ is 15.2J and 16.0J, and the spheroidization rate is 95 percent and 96 percent.
Comparative example 1
The preparation method is the same as that of example 1, except that the addition amount of Ce and Sb elements is reduced, so that the Ce content after spheroidization is 0.02% and the Sb content is 0.004%.
The performance of the 70mm thick attached casting test block of the 2.5MW bearing cover plate casting block prepared by the method is as follows: the tensile strength is 524MPa, the yield strength is 395MPa, the elongation is 13.1 percent, the impact value at the temperature of minus 20 ℃ is 15.3J, and the spheroidization rate is 86 percent.
Comparative example 2
The preparation method is the same as that of example 1, except that the addition amount of the Ce element is increased to make the content of Ce after spheroidization 0.085%.
The performance of the 70mm thick attached casting test block of the 2.5MW bearing cover plate casting block prepared by the method is as follows: the tensile strength is 503MPa, the yield strength is 375MPa, the elongation is 11.9 percent, the impact value at the temperature of minus 20 ℃ is 14.5J, and the nodularity is 83 percent.
Comparative example 3
The preparation method is the same as that of example 1, except that the inoculant does not contain Bi and other components are the same.
The performance of the 70mm thick attached casting test block of the 2.5MW bearing cover plate casting block prepared by the method is as follows: tensile strength 498MPa, yield strength 369MPa, elongation 10.98%, impact value at minus 20 ℃ 14.2J and spheroidization rate 79%.
Comparative example 4
The preparation method is the same as that of example 1, except that after the inoculant is added, the addition amount of the Bi element is increased, so that the Bi content in the casting is 0.02%.
The performance of the 70mm thick attached casting test block of the 2.5MW bearing cover plate casting block prepared by the method is as follows: the tensile strength is 521MPa, the yield strength is 402MPa, the elongation is 14.7 percent, the impact value at the temperature of minus 20 ℃ is 15.3J, and the spheroidization rate is 90 percent.
Comparative example 5
The preparation method is the same as that of example 1, except that the particle size of the stream inoculant b is 4-6 mm.
The performance of the 70mm thick attached casting test block of the 2.5MW bearing cover plate casting block prepared by the method is as follows: tensile strength 476MPa, yield strength 358MPa, elongation 12.1%, impact value at-20 ℃ of 15.4J and spheroidization rate 87%.
The contents expressed in the present invention are all mass contents.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention; those skilled in the art can make various changes, modifications and alterations without departing from the scope of the invention, and all equivalent changes, modifications and alterations to the disclosed technology are equivalent embodiments of the present invention; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (6)
1. The silicon solid solution strengthened ferritic nodular cast iron is characterized in that the silicon solid solution strengthened ferritic nodular cast iron comprises the following element components in percentage by mass: 3.3 to 3.7 percent of C, 3.5 to 4.2 percent of Si, less than or equal to 0.25 percent of Mn, 0.04 to 0.06 percent of Mg, less than or equal to 0.035 percent of P, less than or equal to 0.015 percent of S, 0.042 to 0.058 percent of Ce, 0.008 to 0.012 percent of Sb, 0.012 to 0.016 percent of Bi, less than or equal to 0.05 percent of Ca and the balance of Fe.
2. A preparation method of silicon solid solution reinforced ferritic nodular cast iron is characterized by comprising the following steps:
(1) adding pig iron and scrap steel into a medium-frequency induction furnace, heating to 1420-1480 ℃ for melting, detecting the content of carbon in the molten iron after all the molten iron is melted, and adjusting the content of C to 3.3-3.7% to form original molten iron;
(2) spheroidizing the molten iron by using a flushing method, wherein the adding amount of a spheroidizing agent is 1.0-2.0% of the weight of the original molten iron, when the spheroidizing agent is tight during preparation of a spheroidizing bag, 75 ferrosilicon with the weight of 0.3-0.4% of the weight of the original molten iron and an inoculant a with the particle size of 3-8 mm are uniformly covered above the spheroidizing agent, and elements Ce and Sb are added during spheroidizing, so that the content of Ce after spheroidizing is 0.042-0.058%, the content of Sb is 0.008-0.012%, and the adding amount of the inoculant a is 0.5-0.8% of the weight of the original molten iron;
(3) stream inoculation is carried out during pouring, the adding amount of a stream inoculant b is 0.25-0.30 percent of the weight of the original molten iron, and the pouring temperature of the molten iron is 1360-1380 ℃;
(4) and cooling the molten iron to obtain the silicon solid solution strengthened ferrite nodular cast iron.
3. The method of claim 2, wherein the pig iron has a P content of 0.03% or less, an S content of 0.015% or less, a P content of scrap iron of 0.035% or less, an S content of 0.015% or less, and an Mn content of 0.25% or less.
4. The method of claim 2, wherein the ratio of pig iron to scrap added is (6-7) to (3-4).
5. The method for preparing the silicon solid solution reinforced ferritic nodular cast iron as claimed in claim 2, wherein the nodulizer comprises 0.3-0.5% of Ce, 2.5-4.0% of Mg, 40.0-45.0% of Si, 0.5-0.8% of Ca, and the balance of Fe.
6. The method for preparing the silicon solid solution reinforced ferritic spheroidal graphite cast iron according to claim 2, characterized in that the inoculant a contains 65.0-75.0% of Si, 0.3-0.5% of Bi, and the balance of Fe; the content of Si in the inoculant b is 65.0-75.0%, the content of Bi is 0.3-0.5%, the balance is iron, and the particle size of the inoculant b is 1-2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810831628.4A CN110760740A (en) | 2018-07-26 | 2018-07-26 | Silicon solid solution reinforced ferrite nodular cast iron and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810831628.4A CN110760740A (en) | 2018-07-26 | 2018-07-26 | Silicon solid solution reinforced ferrite nodular cast iron and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110760740A true CN110760740A (en) | 2020-02-07 |
Family
ID=69328282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810831628.4A Pending CN110760740A (en) | 2018-07-26 | 2018-07-26 | Silicon solid solution reinforced ferrite nodular cast iron and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110760740A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113737085A (en) * | 2021-09-07 | 2021-12-03 | 襄阳金耐特机械股份有限公司 | Nodular cast iron axle housing and manufacturing method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1718819A (en) * | 2005-08-04 | 2006-01-11 | 郭成会 | Rare earth silicon cerium bismuth alloy and its production technology |
| CN104988381A (en) * | 2015-07-17 | 2015-10-21 | 江苏吉鑫风能科技股份有限公司 | Large-section cast ferrite nodular cast iron and preparation method thereof |
| CN106011607A (en) * | 2016-07-15 | 2016-10-12 | 江苏汽铸造股份有限公司 | Silicon solid melt reinforced ferrite nodular cast iron and preparation technique thereof |
-
2018
- 2018-07-26 CN CN201810831628.4A patent/CN110760740A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1718819A (en) * | 2005-08-04 | 2006-01-11 | 郭成会 | Rare earth silicon cerium bismuth alloy and its production technology |
| CN104988381A (en) * | 2015-07-17 | 2015-10-21 | 江苏吉鑫风能科技股份有限公司 | Large-section cast ferrite nodular cast iron and preparation method thereof |
| CN106011607A (en) * | 2016-07-15 | 2016-10-12 | 江苏汽铸造股份有限公司 | Silicon solid melt reinforced ferrite nodular cast iron and preparation technique thereof |
Non-Patent Citations (2)
| Title |
|---|
| 刘静华 张定铨 等编: "《钢铁热处理》", 31 May 1981, 陕西科学技术出版社 * |
| 叶定闽编著: "《铸态球墨铸铁》", 31 October 2016, 四川大学出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113737085A (en) * | 2021-09-07 | 2021-12-03 | 襄阳金耐特机械股份有限公司 | Nodular cast iron axle housing and manufacturing method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104988381B (en) | Large-section cast ferrite nodular cast iron and preparation method thereof | |
| CN102392178B (en) | Nodular cast iron and centrifugal composite casting roller | |
| CN108396219B (en) | Cast high-strength nodular cast iron for crankshaft and preparation method thereof | |
| CN100386462C (en) | Boron contg. multi-element low alloyed wearable cast steel and prepn. thereof | |
| CN105063467B (en) | A kind of control method of big cross section silicon solution strengthening ferrite ductile cast iron center portion graphite form | |
| CN102251164B (en) | Smelting method for wind generating set casting | |
| CN101363097A (en) | Low-temperature impact resistant as-cast ductile iron with big section and production method thereof | |
| CN101988174A (en) | Large-scale ball mill liner and heat treatment method thereof | |
| CN108004460A (en) | A kind of high-intensity and high-tenacity as cast condition QT800-5 spheroidal graphite cast-iron and its production method | |
| CN110894582B (en) | High-strength and high-heat-conductivity vermicular graphite cast iron and preparation method thereof | |
| CN109594010B (en) | Method for producing as-cast QT950-4 crankshaft by adopting all-steel scrap | |
| CN112962018B (en) | Chilling process manufacturing method of non-label QT600-7 nodular cast iron | |
| CN113025874B (en) | Hypereutectic high-chromium cast iron and inoculation modification treatment method thereof | |
| CN101550518A (en) | Boron-containing multi-element low alloy wear resistant cast steel and preparing method thereof | |
| CN112853025A (en) | Casting process of nodular iron casting for wind power | |
| CN112853190B (en) | High-entropy cast iron and preparation method thereof | |
| CN104532118A (en) | Special high-performance high-nickel austenite vermicular cast iron for piston mounting rings and preparation method thereof | |
| CN112680650A (en) | High-strength nodular cast iron and preparation method thereof | |
| CN111074171A (en) | ZG130Mn8Cr2VTiRe medium manganese wear-resistant steel and preparation method thereof | |
| CN104805368A (en) | Chromium-tungsten-manganese-rare-earth-based quasi bainitic steel and preparation method thereof | |
| CN102534090B (en) | Preparation method of-60 ℃ low-temperature impact nodular cast iron | |
| CN110280712A (en) | A kind of precision-investment casting spheroidal graphite cast-iron QT700-8 production method | |
| CN109355454A (en) | A kind of high-intensity and high-tenacity as cast condition QT700-8 nodular iron casting and its production technology | |
| CN110760740A (en) | Silicon solid solution reinforced ferrite nodular cast iron and preparation method thereof | |
| CN114369756B (en) | As-cast QT700-8 material and casting method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200207 |
|
| RJ01 | Rejection of invention patent application after publication |