CN114411048A - As-cast ferrite nodular iron casting - Google Patents
As-cast ferrite nodular iron casting Download PDFInfo
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- CN114411048A CN114411048A CN202210079149.8A CN202210079149A CN114411048A CN 114411048 A CN114411048 A CN 114411048A CN 202210079149 A CN202210079149 A CN 202210079149A CN 114411048 A CN114411048 A CN 114411048A
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
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- 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
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- 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
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- 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
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention relates to an as-cast ferrite nodular cast iron casting, which comprises the following components: 3.4-3.9%, Si: 2.1-3.0%, Mn is less than or equal to 0.25%, P is less than or equal to 0.03%, S is less than or equal to 0.03%, RE: 0.045-0.07%, Mg: 0.055-0.09%, the rest is Fe and inevitable impurities, the spheroidization grade of the iron casting is 1-2 grade, the graphite size grade is 6-7 grade, and the quantity of cementite is not higher than 2%.
Description
Technical Field
The invention relates to an as-cast ferrite nodular iron casting, belonging to the technical field of nodular cast iron.
Background
The technological research on as-cast ferritic spheroidal graphite cast iron has been started abroad as early as around 70 in the 20 th century, and related research on as-cast ferritic spheroidal graphite cast iron has been started in China around 1990. The ferritic nodular cast iron has high attention due to excellent mechanical properties, and is widely applied to various mechanical parts, particularly parts working under low-temperature working conditions. On the other hand, the cast structure of a general spheroidal graphite cast iron is a ferrite structure and a pearlite structure, and further heat treatment of an ingot is required to obtain a full ferrite structure. Therefore, the economic advantages of producing the as-cast ferrite nodular cast iron are obvious, excellent mechanical properties can be obtained without heat treatment, the heat treatment process is omitted, the production efficiency is improved, the production cost is reduced, and the manpower, material resources and financial resources are saved.
Mg and RE are indispensable spheroidizing elements of the nodular cast iron, but are also anti-graphitization elements at the same time. Therefore, since no heat treatment is performed, the control of the contents of Mg and RE is particularly important in the production process of as-cast ferritic spheroidal graphite cast iron. If the content of RE and Mg is too large, the white cast iron (cementite) tends to be severe, the graphitization effect cannot be ensured, and if the content of RE and Mg is too small, the spheroidization effect of the nodular cast iron cannot be ensured.
In actual production, enterprises often choose to add low-content RE and Mg, so that the spheroidization effect and the graphitization effect are hardly considered, and the cast ferrite nodular iron casting is not excellent in mechanical property and limited in application.
Disclosure of Invention
The invention provides an as-cast ferrite nodular iron casting, which can obtain a nodular iron casting with excellent graphitization effect and spheroidization effect without heat treatment even under the condition of higher RE and Mg contents, thereby ensuring the excellent mechanical property of the iron casting.
Technical means for achieving the technical objects of the present invention are described in detail below.
The invention provides an as-cast ferrite nodular iron casting which comprises the following components: 3.4-3.9%, Si: 2.1-3.0%, Mn is less than or equal to 0.25%, P is less than or equal to 0.03%, S is less than or equal to 0.03%, RE: 0.045-0.07%, Mg: 0.055-0.09%, and the balance of Fe and inevitable impurities.
The spheroidization grade of the iron casting is 1-2 grade, the graphite size grade is 6-7 grade, and the quantity of cementite is not higher than 2 percent; preferably, the cast iron article has a spheroidization grade of grade 1, a graphite size grade of grade 7, and a cementite content of not more than 1% (including 0%, i.e., no cementite contained).
The iron casting with the components and the microstructure has the following mechanical properties: the tensile strength reaches more than 480MPa, the yield strength reaches more than 300MPa, the elongation reaches more than 19.5 percent, and the impact at minus 40 DEG CToughness of 18J/cm2The above.
It should be noted that, because both RE and Mg are elements promoting spheroidization, it is not difficult to obtain a high spheroidization grade and a high graphite size grade in an as-cast state for cast ferrite nodular iron castings with high RE and Mg contents, but both RE and Mg are strong anti-graphitization elements, and the presence of white texture (cementite) is directly caused by excessively high RE and Mg contents, so that it is very difficult to strictly control the RE and Mg contents in a normal as-cast ferrite nodular iron, and to ensure that no white texture (i.e. an extremely low cementite number, corresponding to an excellent graphitization effect) is present for cast ferrite nodular iron castings with high RE and Mg contents. That is, for as-cast ferritic spheroidal graphite cast iron, the spheroidization effect and the graphitization effect are often incompatible.
It is in recognition of the above problems that the present inventors have provided the above-mentioned cast ferritic spheroidal graphite cast iron member, which can achieve both spheroidization effect and graphitization effect, and can satisfy the technical requirements of spheroidization grade of 1-2, graphite grade of 6-7 and cementite amount of not more than 2% under the condition that the content of RE in the cast iron member reaches 0.045-0.07%, and the content of Mg reaches 0.055-0.09%, particularly, the content of RE is preferably 0.055-0.07%, and the content of Mg is preferably 0.065-0.09%.
The above spheroidizing effect and graphitization effect are obtained by the following recognition. The inventor of the invention finds that after the iron casting is poured, the longer the sand falling time is, the longer the heat preservation time of the iron casting is, the more sufficient the graphitization effect is, but the growth trend of the nodular graphite is obvious, and the size of the nodular graphite becomes uncontrollable in the sand falling process; the shorter the sand falling time is, the shorter the heat preservation time of the iron casting is, and although the spheroidizing effect is ensured, the graphitization effect is insufficient, and the graphitization cannot meet the requirements. Based on the above knowledge, the inventors found that controlling the wall thickness H and the relationship between the sand-falling time T of cast iron parts after casting and RE and Mg according to different iron parts can ensure both the spheroidizing effect and the graphitization effect at high RE and Mg contents. When high RE and Mg are added in the components in order to ensure the spheroidizing effect, the cast ferrite nodular iron casting with the spheroidizing effect and the graphitization effect meeting the requirements can still be produced.
That is, the present invention ensures the spheroidization effect by increasing the contents of RE and Mg, can ensure the spheroidization grade of 1 to 2 grade and the graphite size grade of 6 to 7 grade even in a long shakeout time, and then obtains an as-cast ferritic nodular iron casting having almost or no cementite (the amount of cementite is 2% or less, preferably 1% or 0%) by controlling an appropriate shakeout time, eliminating the white texture, and ensuring excellent graphitization effect, on the basis of ensuring the spheroidization grade and the graphite size grade. Thus, the iron casting excellent in graphitization effect, spheroidization effect, and mechanical properties as described earlier in the present invention is finally obtained.
As is well known to those skilled in the art, the preparation of as-cast ferritic spheroidal graphite iron castings necessarily involves a casting step. The invention finds that after the casting is finished, the control of the wall thickness H of the iron casting, the RE content, the Mg content and the sand falling time T to meet the following relational expression is crucial to the achievement of the excellent graphitization effect and the spheroidization effect, and the relational expression is as follows:
12.5H1/2×e10.5(0.55Mg+1.95RE)≥T≥12.5H1/2×e7.5(0.55Mg+1.95RE)；
in the formula: the wall thickness H of the iron casting is mm, and the sand falling time T is min.
The inventor finds that when the wall thickness, RE and Mg contents and the shakeout time of an iron casting meet the relationship, the cast ferrite nodular cast iron meeting the requirements of the spheroidization grade, the graphite size grade and the cementite quantity of the invention can be finally prepared, and further, the cast ferrite nodular cast iron with the tensile strength of more than 480MPa, the yield strength of more than 300MPa, the elongation of more than 19.5 percent and the impact toughness of 18J/cm at minus 40 ℃ can be obtained2The above excellent properties. The cast iron part has the advantages of mechanical property and cost, the production process of the cast iron part is simplified, the comprehensive performance of the cast iron part is improved, and the application range of the cast iron part is widened.
For the iron casting according to the invention, it is preferable to select an iron casting with a uniform wall thickness, which may be 200mm or less, in order to ensure uniformity of the effect of the sand-falling time on the microstructure, preferably a thickness of 3 to 180mm, more preferably 5 to 150mm, particularly preferably 10 to 120mm, 15 to 100mm, 20 to 80 mm.
As a further description, the preparation process of the iron casting of the present invention also includes the steps of smelting, spheroidizing and inoculation before the step of casting.
By way of non-limiting illustration, the inoculation includes more than one inoculation. Multiple inoculation methods have proven to be critical to achieve excellent graphitization, such as a combination of inoculation with a nodulizer (primary inoculation), secondary inoculation in a ladle after nodulization (floating silicon inoculation), and tertiary inoculation during ladle pouring (stream inoculation), and the inoculant can be, but is not limited to, a 75SiFe inoculant, preferably with a particle size of 0.8-3.2mm, with a suitable inoculant particle size having a beneficial effect on inoculation.
In the spheroidizing step, a dam-type ladle is preferably adopted in the spheroidizing process, the teapot-type ladle is used for spheroidizing by a dam-type flushing method, a nodulizer is placed in the dam close to one side of the ladle, a part of inoculant (namely the inoculant for primary inoculation) is covered on the upper part of the dam, after the spheroidizing reaction is finished, part of the inoculant is placed on the surface of molten iron for secondary inoculation, and part of the inoculant is added for tertiary inoculation during pouring. Through the improvement of the spheroidizing process and the combination of various inoculation modes, the excellent spheroidizing effect and inoculation effect can be ensured, and the spheroidizing grade and the graphitization effect which meet the requirements are favorably obtained.
By way of non-limiting illustration, the nodularizer may be selected from FeSiMg8RE5, with a particle size of 6-12mm, and a suitable nodularizer particle size is important for the nodularization effect, which is advantageous for achieving a satisfactory nodularization grade, a graphite size grade.
Based on the total mass of molten iron: in the spheroidizing process, the dosage of a nodulizer is controlled to be 1.4-1.7%, the dosage of an inoculant covering the nodulizer is 0.4-0.7%, the dosage of an inoculant for secondary inoculation is 0.8-1.4%, and the dosage of an inoculant for tertiary inoculation, namely instantaneous inoculation is 0.2-0.5%, and the spheroidizing mode, the inoculation mode, the dosage of the nodulizer and the dosage of the inoculant are important for obtaining good spheroidizing grade and graphitization effect.
In the smelting process, a medium-frequency induction furnace is preferably adopted for smelting, the smelting temperature is 1525-1555 ℃, and the proper smelting temperature can fully diffuse graphite in molten iron, so that fine graphite is separated out by recrystallization during the solidification of the molten iron, and the graphitization effect is ensured.
The beneficial effects of the invention are as follows.
The cast ferrite nodular iron casting provided by the invention can give consideration to both the spheroidization effect and the graphitization effect, and can still meet the technical requirements that the spheroidization grade is 1-2 grade, the graphite size grade is 6-7 grade and the cementite quantity is not higher than 2% when the RE content in the iron casting reaches 0.045-0.07% and the Mg content reaches 0.055-0.09%; the mechanical properties are as follows: the tensile strength reaches more than 480MPa, the yield strength reaches more than 300MPa, the elongation reaches more than 19.5 percent, and the impact toughness at minus 40 ℃ is 18J/cm2The above. The cast iron part has the advantages of mechanical property and cost, the production process of the cast iron part is simplified, the comprehensive performance of the cast iron part is improved, and the application range of the cast iron part is widened. The area ratio of the ferrite of the as-cast ferrite nodular iron casting is 90-100%, and the preferable ratio is more than 95%.
Detailed Description
In order to make those skilled in the art fully understand the technical solutions and advantages of the present invention, the following embodiments are further described.
Selecting Q12 pig iron, scrap steel, scrap returns and the like as raw materials according to design components, and smelting by adopting a medium-frequency induction furnace at the smelting temperature of 1535 +/-5 ℃.
Pouring molten iron into a teapot type ladle after smelting is finished, adopting a dam type ladle, carrying out spheroidization by using the teapot type ladle through a dam type pouring method, selecting FeSiMg8RE5 as a spheroidizing agent, wherein the granularity is 8-12mm, using 75SiFe inoculant with the granularity of 1.0-2.0mm as the inoculant, putting the spheroidizing agent accounting for 1.4-1.7% of the total amount of the molten iron into the dam close to one side of the ladle according to the specific Mg-RE content condition, covering the nucleating agent accounting for 0.5% of the total amount of the molten iron on the dam, covering a layer of clean scrap iron accounting for about 5mm on the dam, scattering perlite, starting initiation reaction boiling when the amount of the molten iron in the ladle reaches about 1/3 height, controlling the reaction time to be longer than the time of all molten iron pouring, stirring and slagging off after the reaction is finished, then putting 75SiFe inoculant accounting for 0.9% of the total amount of the molten iron into the surface of the poured molten iron for secondary inoculation, adding 0.25% of the total amount of the molten iron into the ladle for third inoculation, controlling the iron liquid to cast at 1410 +/-5 ℃.
5 iron castings are poured into each ladle of molten iron of the 1 st ladle to the 6 th ladle, and are respectively numbered as i-1, i-2, i-3, i-4 and i-5(i represents the ladle number, namely the same ladle has the same component), and 2 iron castings are poured into each ladle of molten iron of the 7 th ladle to the 10 th ladle, and are respectively numbered as i-1 and i-2(i represents the ladle number, namely the same ladle has the same component). And after the casting is finished, immediately performing water quenching to analyze chemical components after one of the iron castings is finished, controlling different sand falling time of the other iron castings according to the chemical components obtained by testing and the wall thickness of the iron castings, and performing mechanical property testing and microstructure observation after the iron castings are cooled. The analysis of chemical components, the test of room temperature strength and room temperature elongation, and the observation and analysis of microstructure are carried out according to the national standard GB/T1348-2009 and the cited standard requirements.
The analysis results of the chemical components of the as-cast ferrite nodular iron castings of ladle numbers 1-10 are shown in table 1.
Table 1 (the components are in percentage by mass, and the balance is Fe)
| Numbering | C | Si | Mn | RE | Mg | P | S |
| 1-1 | 3.47 | 2.87 | 0.13 | 0.068 | 0.057 | 0.012 | 0.010 |
| 2-1 | 3.51 | 2.71 | 0.14 | 0.056 | 0.066 | 0.013 | 0.009 |
| 3-1 | 3.59 | 2.59 | 0.15 | 0.049 | 0.074 | 0.012 | 0.009 |
| 4-1 | 3.67 | 2.40 | 0.13 | 0.065 | 0.085 | 0.009 | 0.008 |
| 5-1 | 3.75 | 2.18 | 0.11 | 0.054 | 0.086 | 0.009 | 0.010 |
| 6-1 | 3.88 | 2.82 | 0.12 | 0.060 | 0.062 | 0.008 | 0.008 |
| 7-1 | 3.54 | 2.77 | 0.12 | 0.084 | 0.058 | 0.008 | 0.006 |
| 8-1 | 3.72 | 2.65 | 0.14 | 0.032 | 0.064 | 0.012 | 0.011 |
| 9-1 | 3.68 | 2.71 | 0.11 | 0.053 | 0.121 | 0.007 | 0.004 |
| 10-1 | 3.79 | 2.66 | 0.13 | 0.058 | 0.046 | 0.011 | 0.011 |
After the chemical components are obtained, the sand falling time is set according to the wall thickness, the RE content and the Mg content of different iron castings, the mechanical property test and the microstructure observation are carried out after the iron castings are cooled, the results of the observation and analysis of the wall thickness, the sand falling time and the microstructure are shown in the table 2, and 12.5H is used for analyzing the wall thickness, the sand falling time and the microstructure1/2×e10.5(0.55Mg+1.95RE)Is marked as Tmax，12.5H1/2×e7.5(0.55Mg+1.95RE)Is marked as TminThe white texture condition is represented by the quantity of the cementite, so that the graphitization effect of the iron casting is reflected, the higher the quantity of the cementite is, the poorer the graphitization effect is, the lower the quantity of the cementite is, and the better the graphitization effect is. The mechanical properties are shown in table 3.
Table 2 shows the wall thickness, the shakeout time and the microstructure of each cast iron part.
TABLE 2
Further analysis is described below in conjunction with the chemical compositions of table 1 and the microstructures of table 2.
For a No. 1-6 foundry ladle, i-1 tests to obtain the components (i is 1-6) of each ladle of molten iron, and i-2-i-5 respectively tests the microstructure performance conditions under different shakeout time conditions aiming at the same components and the same wall thickness, so that the shakeout time of the iron casting numbered i-2 can not reach the lower limit of the requirement of the invention, although the spheroidization grade and the graphite size grade can meet the requirement of the invention, the sand shakeout time is short, the number of cementite in the microstructure exceeds the standard, the white structure is increased, the graphitization effect is poor, and the graphitization effect can not reach the requirement of the invention; the sand falling time of the iron casting with the number i-5 exceeds the upper limit of the requirement of the invention, the quantity of cementite in the microstructure is lower, the requirement of the invention can be met, but the sand falling time is too long, the spherical graphite is seriously deformed and the size becomes uncontrollable, so that the spheroidization grade or the graphite size grade cannot meet the requirement of the invention.
For a No. 7-10 foundry ladle, the components (i is 7-10) of molten iron in each ladle are obtained through i-1 inspection, i-2 respectively tests the microstructure performance condition under the condition of the sand falling time meeting the requirement of the formula aiming at the same components and the same wall thickness, but because the contents of RE and Mg are too high or too low, the microstructure performance condition is not in the invention requirement range, and even if the sand falling is carried out in the time range meeting the requirement of the formula, the iron casting meeting the microstructure requirement of the invention cannot be obtained.
In conclusion, it is shown that the control of the sand falling time by combining the wall thickness, the RE content and the Mg content is crucial to obtain the microstructure meeting the requirements of the invention.
Table 3 shows the mechanical properties of the individual iron castings.
TABLE 3
| Numbering | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) | -40 ℃ impact toughness (J/cm)2) |
| 1-2 | 435 | 251 | 18.6 | 16.3 |
| 1-3 | 501 | 325 | 20.3 | 18.5 |
| 1-4 | 492 | 318 | 20.6 | 18.7 |
| 1-5 | 414 | 241 | 17.3 | 17.6 |
| 2-2 | 422 | 243 | 19.0 | 17.1 |
| 2-3 | 498 | 321 | 20.8 | 19.2 |
| 2-4 | 486 | 310 | 21.3 | 19.8 |
| 2-5 | 408 | 237 | 17.2 | 17.4 |
| 3-2 | 444 | 258 | 18.4 | 16.1 |
| 3-3 | 512 | 329 | 19.9 | 18.3 |
| 3-4 | 510 | 325 | 20.2 | 18.6 |
| 3-5 | 425 | 244 | 17.3 | 17.7 |
| 4-2 | 431 | 255 | 18.5 | 16.5 |
| 4-3 | 505 | 328 | 20.1 | 18.5 |
| 4-4 | 499 | 317 | 20.4 | 18.8 |
| 4-5 | 428 | 240 | 17.5 | 17.2 |
| 5-2 | 451 | 261 | 17.8 | 17.9 |
| 5-3 | 518 | 331 | 19.8 | 18.3 |
| 5-4 | 505 | 324 | 20.3 | 18.7 |
| 5-5 | 430 | 242 | 17.4 | 16.9 |
| 6-2 | 462 | 268 | 17.1 | 16.5 |
| 6-3 | 531 | 352 | 19.6 | 18.0 |
| 6-4 | 524 | 241 | 19.9 | 18.4 |
| 6-5 | 457 | 260 | 17.6 | 17.5 |
| 7-2 | 386 | 215 | 14.6 | 15.2 |
| 8-2 | 471 | 289 | 20.3 | 18.8 |
| 9-2 | 359 | 202 | 14.9 | 15.7 |
| 10-2 | 477 | 296 | 19.8 | 18.2 |
It can be easily seen by combining tables 1, 2 and 3 that the mechanical properties of the iron castings with the microstructure which cannot meet the requirements of the invention, so that the control of the sand shakeout time by combining the wall thickness, the RE content and the Mg content is crucial to obtaining the microstructure which meets the requirements of the invention, and the microstructure of the as-cast ferrite nodular iron castings plays a decisive role in various mechanical properties of the iron castings.
From the above data, it can be seen that the control of the required components and microstructure of the present invention is important to ensure the mechanical properties of iron castings, and the specific microstructure is prepared by matching the required components of the present invention with a specific preparation process.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. An as-cast ferritic nodular iron casting characterized in that: the components of the as-cast ferrite nodular iron casting are as follows: 3.4-3.9%, Si: 2.1-3.0%, Mn is less than or equal to 0.25%, P is less than or equal to 0.03%, S is less than or equal to 0.03%, RE: 0.045-0.07%, Mg: 0.055-0.09%, the rest is Fe and inevitable impurities, the spheroidization grade of the iron casting is 1-2 grade, the graphite size grade is 6-7 grade, and the quantity of cementite is not higher than 2%.
2. The as-cast ferritic nodular iron casting of claim 1 wherein the as-cast ferritic nodular iron casting has a tensile strength of 480MPa or more, a yield strength of 300MPa or more, an elongation of 19.5% or more, and an impact toughness of 18J/cm at-40 ℃, (c) an impact toughness of 18J/cm2The above.
3. The as-cast ferritic spheroidal graphite iron casting of claim 1, characterized in that the as-cast ferritic spheroidal graphite iron casting has a uniform wall thickness.
4. The as-cast ferritic spheroidal graphite iron casting according to claim 1, characterized in that the wall thickness is 200mm or less.
5. The as-cast ferritic nodular iron casting according to claims 1-4, characterized in that the preparation of the as-cast ferritic nodular iron casting comprises a casting step, after the casting is completed, controlling the wall thickness H and RE of the iron casting, the Mg content and the sand-falling time T to satisfy the following relation:
12.5H1/2×e10.5(0.55Mg+1.95RE)≥T≥12.5H1/2×e7.5(0.55Mg+1.95RE)；
in the formula: the wall thickness H of the iron casting is mm, and the sand falling time T is min.
6. The as-cast ferritic spheroidal graphite iron casting according to claims 1-5, characterized in that the casting step is preceded by a smelting, spheroidizing, inoculation step.
7. The as-cast ferritic spheroidal graphite iron casting according to claims 1-6, characterized in that the inoculation comprises more than one inoculation.
8. The as-cast ferritic spheroidal graphite iron casting according to claims 1-7, characterized in that the inoculation comprises an out-of-package inoculation.
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| CN114438399A (en) * | 2022-01-30 | 2022-05-06 | 襄阳金耐特机械股份有限公司 | Preparation method of as-cast ferrite nodular iron casting |
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| JPS5658945A (en) * | 1979-10-18 | 1981-05-22 | Hitachi Zosen Corp | High toughness nodular graphite cast iron |
| JPS6173859A (en) * | 1984-09-19 | 1986-04-16 | Ishikawajima Harima Heavy Ind Co Ltd | Ferritic spheroidal graphite cast iron having high toughness and oxidation resistance |
| CN105861915A (en) * | 2016-06-27 | 2016-08-17 | 含山县兴达球墨铸铁厂 | Ferritic spheroidal graphite cast iron and preparation method thereof |
| CN108103392A (en) * | 2018-01-12 | 2018-06-01 | 湖北星源科技有限公司 | A kind of high-strength ductile cast iron production method |
| WO2019238321A1 (en) * | 2018-06-11 | 2019-12-19 | Federal-Mogul Nürnberg GmbH | Piston for internal combustion engines, and use of a piston for internal combustion engines |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114438399A (en) * | 2022-01-30 | 2022-05-06 | 襄阳金耐特机械股份有限公司 | Preparation method of as-cast ferrite nodular iron casting |
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| CN114411048B (en) | 2022-09-23 |
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