CN117144233A - As-cast wear-resistant spheroidal graphite cast iron - Google Patents
As-cast wear-resistant spheroidal graphite cast iron Download PDFInfo
- Publication number
- CN117144233A CN117144233A CN202311376188.5A CN202311376188A CN117144233A CN 117144233 A CN117144233 A CN 117144233A CN 202311376188 A CN202311376188 A CN 202311376188A CN 117144233 A CN117144233 A CN 117144233A
- Authority
- CN
- China
- Prior art keywords
- wear
- spheroidal graphite
- cast iron
- resistant
- graphite cast
- 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
- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 118
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 28
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 15
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 238000005266 casting Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 description 37
- 229910001037 White iron Inorganic materials 0.000 description 14
- 229910052758 niobium Inorganic materials 0.000 description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 12
- 230000000694 effects Effects 0.000 description 8
- 239000010439 graphite Substances 0.000 description 8
- 229910002804 graphite Inorganic materials 0.000 description 8
- 239000011777 magnesium Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000011572 manganese Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 238000005275 alloying Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000005087 graphitization Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- -1 mine Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- 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 wear-resistant spheroidal graphite cast iron, which comprises the following components: 3.3-3.8%, si:1.8-2.4%, mn:0.2-0.5%, W:0.3-0.6%, nb:0.1-0.4%, P is less than or equal to 0.05%, S is less than or equal to 0.05%, and the balance is Fe and unavoidable impurities; and C, W, nb content satisfies the following relationship: [C] 12=kx ([ W ]/184+ [ Nb ]/93), wherein k=45-88, [ C ], [ W ], [ Nb ] represent the percentage of C, W, nb in the as-cast wear-resistant spheroidal graphite cast iron, respectively, which is suitable for wear-resistant lining plates, grinding balls and other wear-resistant parts.
Description
Technical Field
The invention relates to an as-cast wear-resistant spheroidal graphite cast iron, which belongs to the technical field of cast iron, has wear resistance as the level of wear-resistant white cast iron, retains the toughness of spheroidal graphite cast iron and has the cost advantage, and can replace the wide application of wear-resistant white cast iron with high cost and insufficient toughness in wear-resistant parts.
Background
The wear-resistant material is widely applied in the fields of metallurgy, building materials, coal, mine, chemical industry and the like, and the wear-resistant white cast iron has outstanding wear resistance, so that the wear-resistant material becomes a main material applied to wear-resistant parts in the related fields. However, during use, wear-resistant white cast iron suffers from two major drawbacks: on one hand, the contents of Ni, cr and Mo are higher, for example, the content of Cr in BTMCr26 reaches 23-30%, the content of Mo reaches 3%, and the content of Ni reaches 2.5%, so that the wear-resistant white cast iron has high cost and high price; on the other hand, the wear-resistant white cast iron piece is poor in toughness and insufficient in impact resistance, for example, in the actual use process of the wear-resistant white cast iron piece as an abrasive lining plate, the problem that the wear-resistant white cast iron piece is broken and failed due to high impact on part caused by uneven hardness of a material to be ground often occurs, and the reliability of long-term work under severe working conditions is insufficient.
As the spheroidal graphite cast iron is used as an important material for replacing steel with iron, the material cost is much lower than that of abrasion-resistant white cast iron because of not containing a large amount of expensive Ni, cr and Mo elements, and the spheroidal graphite cast iron has excellent impact-resistant toughness, but the common abrasion resistance of the spheroidal graphite cast iron on the market is generally about 20HRC, and only about 30HRC can be obtained at most, so that the spheroidal graphite cast iron is far insufficient for adapting to the application requirements of abrasion-resistant working conditions.
Accordingly, the inventors have attempted to improve spheroidal graphite cast iron, while maintaining toughness thereof, and improving wear resistance thereof, in order to obtain spheroidal graphite cast iron having both toughness and wear resistance.
Disclosure of Invention
The invention provides an as-cast wear-resistant spheroidal graphite cast iron, which is prepared by improving conventional spheroidal graphite cast iron, reasonably adding alloying elements and controlling the content of the alloying elements, so that the spheroidal graphite cast iron with remarkably improved wear resistance is obtained, and the common high-toughness characteristics of the spheroidal graphite cast iron are maintained.
The technical purpose of the invention is realized by the following means.
The invention provides an as-cast wear-resistant spheroidal graphite cast iron, which comprises the following components: 3.3-3.8%, si:1.8-2.4%, mn:0.2-0.5%, W:0.3-0.6%, nb:0.1-0.4%, P is less than or equal to 0.05%, S is less than or equal to 0.05%, and the balance is Fe and unavoidable impurities; and C, W, nb content satisfies the following relationship: [C] 12=k× ([ W ]/184+ [ Nb ]/93), wherein k=45-88, [ C ], [ W ], [ Nb ] represent the percentage of C, W, nb in the as-cast wear-resistant spheroidal graphite cast iron, respectively.
The basis for the design of the composition of the present invention is described below.
C: carbon is an element constituting graphite formation, which contributes to an improvement in graphitization degree. The strength of the ductile iron is improved by carbon, the performance of the ductile iron is deteriorated due to graphite segregation and floatation when the carbon is too high, the fluidity of the ductile iron molten iron is poor when the carbon is too low, casting defects are increased, and various mechanical properties are reduced. The content of C suitable for the invention is 3.3-3.8%.
Si: silicon is a strongly graphitizing element. In the spheroidal graphite cast iron, silicon not only can effectively reduce the tendency of white mouths and increase the ferrite quantity, but also has the functions of refining eutectic cells, improving the sphericity of graphite spheres and further improving the strength. If the Si content is too low, the graphitization effect and the strengthening effect of the spheroidal graphite cast iron are insufficient, and if the Si content is too high, the toughness of the spheroidal graphite cast iron is remarkably deteriorated, and the Si content is limited to 1.8-2.4%.
Mn: manganese can be combined with sulfur to generate MnS so as to reduce the deterioration of impurity sulfur on the performance of the spheroidal graphite cast iron, mn is favorable for stabilizing pearlite, a proper amount of Mn is favorable for ensuring the strength of the spheroidal graphite cast iron, the toughness of the spheroidal graphite cast iron is rapidly deteriorated due to too high Mn, and the desulfurization effect and the strengthening effect are insufficient due to too low Mn. The Mn content in the present invention is set to 0.2-0.5%.
W and Nb: compared with the conventional spheroidal graphite cast iron component, the inventor of the invention finds that the addition of a certain amount of W and Nb is very beneficial to obviously improving the wear resistance of the spheroidal graphite cast iron after long-term experimental exploration, and meanwhile, the inventor researches that the addition of W and Nb is not always capable of obtaining the spheroidal graphite cast iron with excellent wear resistance, and further fine control on the content of W, nb and the content relation of C and W, nb is required to obtain the spheroidal graphite cast iron with excellent wear resistance. Although the mechanism is not yet clear, the inventors have verified this through experimental results.
The inventors have made extensive experiments and summaries, and have determined that spheroidal graphite cast iron having excellent wear resistance can be obtained when 0.3-0.6% W, 0.1-0.4% Nb, and the content of C, W, nb is controlled to satisfy [ C ]/12=k× ([ W ]/184+ [ Nb ]/93) and k=45-88, and found that wear resistance is more excellent at k=62-75.
The inventors found that when the content of W and Nb is not too low, the effect of improving the wear resistance of spheroidal graphite cast iron is not significant, and when the content of W and Nb is too high, the toughness and wear resistance of spheroidal graphite cast iron are deteriorated.
In the present invention, as an unavoidable impurity element, P, S is not exhaustive, and the contents of both are defined as P: less than 0.05%, S: the lower the content of impurities below 0.05%, the better, but the higher the requirements for raw materials and smelting, the higher the cost, the specific P and S contents can be reasonably determined by combining the actual cost and performance conditions, but the content of both cannot exceed the limit value of 0.05%.
The spheroidal graphite cast iron of the present invention may further comprise Mg and RE elements on the basis of containing the above elements.
Mg: magnesium is an element that promotes spheroidization, O and S are impurities that hinder spheroidization of graphite, and Mg can react with O and S to promote spherulitic ink. If the Mg content is too low, the spheroidization promoting effect is not remarkable enough, and if the Mg content is too high, inclusions are easily formed or are separated out during crystallization, so that the ductile iron becomes brittle and the plasticity and toughness are reduced. The Mg content in the invention is set to 0.02-0.06%.
RE: rare earth is an element that promotes spheroidization, which can react with O, S, ensures the spheroidization effect of graphite, and contributes to refinement of spherical graphite. Too low refines and ensures insufficient spheroidization effect, too high cost increases and increases the cost of the preparation process. The rare earth content in the invention is set to 0.01-0.03%.
The as-cast wear-resistant spheroidal graphite cast iron has greatly improved wear resistance, maintains the characteristic of excellent toughness of the spheroidal graphite cast iron, and has as-cast hardness of more than 46HRC and room temperature impact toughness KV 2 Is 50J or more. As is well known to those skilled in the art, the hardness and wear resistance of the material are positively correlated, and thus the wear resistance of the wear-resistant spheroidal graphite cast iron is characterized by rockwell Hardness (HRC) in the performance test and effect description of the present invention.
As the cast wear-resistant spheroidal graphite cast iron has toughness and wear resistance, the cast wear-resistant spheroidal graphite cast iron is suitable for various wear-resistant parts, can be used as a substitute of wear-resistant white iron, has very small addition amount of alloying elements, and has very outstanding cost advantages compared with the wear-resistant white iron. By way of non-limiting illustration, the as-cast wear-resistant spheroidal graphite cast iron of the present invention can be applied to components requiring high wear resistance and impact toughness, such as liners, balls, etc., of coal mills, ore mills.
The invention also provides a preparation method of the cast wear-resistant spheroidal graphite cast iron, which comprises the steps of smelting, spheroidizing, inoculating and casting.
In addition, the invention also provides the application of the cast wear-resistant spheroidal graphite cast iron in wear-resistant parts, such as lining plates, grinding balls and the like, as an exemplary description.
At the same time, the invention also provides a wear part comprising the as-cast wear-resistant spheroidal graphite cast iron as described above, which wear part may be a lining plate, a grinding ball, etc., as an exemplary description.
The beneficial effects of the invention are as follows.
The wear-resistant ductile iron alloy disclosed by the invention has the advantages that the components are improved on the basis of the traditional ductile iron, the wear-resistant characteristic of the ductile iron is obviously improved by adding a small amount of W and Nb and cooperatively controlling the content relation between C, W, nb, the toughness of the ductile iron is also at a higher level, the wear-resistant ductile iron which has wear resistance similar to that of the traditional wear-resistant white cast iron and has toughness far higher than that of the traditional wear-resistant white cast iron is obtained, meanwhile, the consumption of the alloy elements W and Nb of the wear-resistant ductile iron is very low, and the cost advantage of the wear-resistant ductile iron alloy is obvious compared with that of the wear-resistant white cast iron. The wear-resistant spheroidal graphite cast iron has excellent toughness and wear resistance matching under the as-cast condition, and is particularly suitable for wear-resistant parts with severe working conditions.
Detailed Description
In order to enable those skilled in the art to fully understand the technical scheme and the beneficial effects of the present invention, the following description is made with reference to specific test examples.
And (3) preparing spheroidal graphite cast iron according to the design components, wherein the P element of all spheroidal graphite cast iron is controlled to be qualified in the range of 0.03+/-0.005%, and the S element of all spheroidal graphite cast iron is controlled to be qualified in the range of 0.02+/-0.005%.
The chemical composition analysis is carried out on the spheroidal graphite cast iron obtained by casting, and the testing of the room temperature toughness and the hardness of the casting is carried out at the same time, and the testing of the room temperature toughness is referred to KV in GB/T229-2020 2 Hardness testing was performed with reference to the standard for HRC in GB/T230.1-2018. The composition of each spheroidal graphite cast iron is described in table 1, wherein k= ([ C)]/12)/([W]/184+[Nb]Each of the mechanical properties of the as-cast spheroidal graphite cast iron is shown in Table 2.
Table 1 the components (mass percent, balance Fe) of each ductile iron.
Table 2 properties of the respective spheroidal graphite cast iron.
As can be seen from tables 1 and 2, in the above test examples, the component contents of numbers 1 to 10 and the k value requirements meet the requirements of the present invention, and the test examples belong to the embodiments of the present invention, and particularly the k values of numbers 1, 3, 4, 9 and 10 are all within the range of 62 to 75, which are preferred by the present invention. Examples 1 to 10 can meet the requirements of the invention, and have the as-cast hardness of more than 46HRC and the as-cast room temperature impact toughness KV 2 Above 50J, particularly, for preferred embodiments 1, 3, 4, 9, 10, the k value satisfies the preferred 62-75 range of the present invention, and the as-cast hardness may reach above 50 HRC.
As can be seen from tables 1 and 2, at least one C, W, nb, k of the spheroidal graphite cast iron with the number of 11-22 does not meet the requirements of the present invention, belongs to the comparative example of the present invention, and the performance of the spheroidal graphite cast iron cannot simultaneously meet the requirements of the cast hardness of more than 46HRC and the cast room temperature impact toughness KV 2 Requirements above 50J.
The comparative examples of the present invention are further described by way of analysis with reference to the chemical compositions of Table 1 and the hardness and toughness of Table 2.
Comparative example 11 as comparative example of example 1, the content of W element was increased on the basis of the same other components, the increased W content exceeded the range required by the present invention, and the k value was still within the range of the invention although the W content was adjusted, but the higher W also resulted in the decrease in toughness of the spheroidal graphite cast iron due to the excessively high W content, and finally, the spheroidal graphite cast iron hardness and toughness of comparative example 11 could not meet the requirements of the present invention, indicating that the appropriate W content is a critical factor for ensuring the toughness and hardness of the spheroidal graphite cast iron.
Comparative example 12 as comparative example of example 5, the content of Nb element was increased on the basis of the same other components, the increased Nb content exceeded the range required by the present invention, and the k value was still within the range of the invention although the Nb element content was adjusted, but the hardness of spheroidal graphite cast iron was deteriorated due to the excessively high Nb content, and at the same time, the toughness of spheroidal graphite cast iron was also decreased due to the higher Nb, and finally, the hardness and toughness of spheroidal graphite cast iron of comparative example 12 were not satisfied with the requirements of the present invention, indicating that the proper Nb content was a critical factor for ensuring the toughness and hardness of spheroidal graphite cast iron.
Comparative example 13 as comparative example of example 4, the content of W element was reduced on the basis of the same other components, the reduced W content exceeded the range required by the present invention, and the k value was still within the range of the invention after adjusting the W element content, but the hardness of spheroidal graphite cast iron was insufficient due to the excessively low W content, and finally, the hardness of spheroidal graphite cast iron of comparative example 13 could not meet the requirement of the present invention, indicating that the appropriate W content was a critical factor for ensuring the hardness of spheroidal graphite cast iron.
Comparative example 14 as comparative example of example 3, the Nb element content was reduced on the basis of the other components being the same, the reduced Nb content was beyond the range required by the present invention, and the k value was still within the range of the invention after the Nb element content was adjusted, but the hardness of spheroidal graphite cast iron was insufficient due to the excessively low Nb content, and finally, the hardness of spheroidal graphite cast iron of comparative example 14 could not meet the requirement of the present invention, indicating that the appropriate Nb content was a critical factor for ensuring the hardness of spheroidal graphite cast iron.
Comparative example 15 as comparative example of example 7, the Nb element content was reduced based on the other components being the same, but the k value after the Nb element content was adjusted was not within the scope of the present invention, and the hardness of the spheroidal graphite cast iron was insufficient due to the k value not conforming to the inventive requirement, and finally, the spheroidal graphite cast iron hardness of comparative example 15 could not satisfy the inventive requirement, indicating that a proper k value is a critical factor for ensuring the hardness of the spheroidal graphite cast iron.
Comparative example 16 as comparative example of example 6, the content of W element was increased on the basis of the other components being the same, but the k value after the content of W element was adjusted was not within the scope of the present invention, and since the k value did not meet the requirements of the present invention, the hardness of spheroidal graphite cast iron was insufficient, and finally, the hardness of spheroidal graphite cast iron of comparative example 16 could not meet the requirements of the present invention, indicating that a proper k value is a critical factor for ensuring the hardness of spheroidal graphite cast iron.
Comparative example 17 as comparative example of example 2, the content of C element was increased on the basis of the same other components, the increased C content exceeded the range required by the present invention, and although the k value was still within the range of the invention after the adjustment of the C element content, graphite segregation and graphite floatation of spheroidal graphite cast iron were severe due to the excessive C content, so that the hardness and toughness of spheroidal graphite cast iron were remarkably deteriorated, and finally, the hardness and toughness of spheroidal graphite cast iron of comparative example 17 were not satisfied with the requirements of the present invention, indicating that the proper C content was a critical factor for ensuring the toughness and hardness of spheroidal graphite cast iron.
Comparative example 18 as comparative example of example 4, the content of C element was reduced on the basis of the same other components, the reduced C content exceeded the range required by the present invention, and the k value was still within the range of the invention although the C content was adjusted, but the casting process of the spheroidal graphite cast iron had insufficient fluidity and more defects due to the excessively low C content, so that the hardness and toughness of the spheroidal graphite cast iron were remarkably deteriorated, and finally, the hardness and toughness of the spheroidal graphite cast iron of comparative example 18 were not satisfied with the requirements of the present invention, indicating that the appropriate C content was a critical factor for ensuring the toughness and hardness of the spheroidal graphite cast iron.
Comparative example 19 as comparative example of example 7, the content of C element was increased on the basis of the other components being the same, but the k value after the content of C element was adjusted was not within the scope of the present invention, and the hardness of spheroidal graphite cast iron was insufficient due to the k value not conforming to the inventive requirement, and finally, the hardness of spheroidal graphite cast iron of comparative example 19 was unable to satisfy the inventive requirement, indicating that a proper k value is a critical factor for ensuring the hardness of spheroidal graphite cast iron.
Comparative example 20 as comparative example of example 8, the same amount of W was used instead of Nb on the basis of the other components, and although the k value after substitution was still within the scope of the invention, the hardness of spheroidal graphite cast iron was insufficient and the toughness of spheroidal graphite cast iron was lowered due to the fact that the W and Nb contents were not in accordance with the invention requirements, and finally, the hardness and toughness of spheroidal graphite cast iron of comparative example 20 were not satisfied with the requirements of the invention, indicating that proper W content and Nb content were critical factors for ensuring the hardness and toughness of spheroidal graphite cast iron.
Comparative example 21 as comparative example of example 9, W was replaced with an equal amount of Nb based on the same other components, and although the k value after replacement was still within the scope of the invention, insufficient hardness of spheroidal graphite cast iron was caused by the fact that the contents of W and Nb were not in accordance with the requirements of the invention, and too high Nb also caused the decrease in toughness of spheroidal graphite cast iron, and finally, the hardness and toughness of spheroidal graphite cast iron of comparative example 21 were not satisfied with the requirements of the invention, indicating that proper W content and Nb content were critical factors for ensuring the hardness and toughness of spheroidal graphite cast iron.
Comparative example 22 as comparative example of example 10, on the basis of the other components being the same, W and Nb elements were not added, that is, the components were equivalent to those of the conventional spheroidal graphite cast iron, and it can be seen that although the room temperature toughness was still satisfactory, the hardness was greatly different from the hardness level required by the present invention, indicating that the addition of Nb and W and the control of k values are critical factors for obtaining the spheroidal graphite cast iron with high hardness.
By combining the above, the nodular cast iron of the invention finally obtains the cast wear-resistant nodular cast iron with excellent hardness and impact toughness by adding a small amount of W and Nb and cooperatively controlling the content relation of C, W, nb, and the nodular cast iron is suitable for various severe wear-resistant parts, and has the advantages of low alloy element content and obvious cost.
The above description of the embodiments is only for aiding in the understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
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 (10)
1. An as-cast wear-resistant spheroidal graphite cast iron, which is characterized by comprising the following components: 3.3-3.8%, si:1.8-2.4%, mn:0.2-0.5%, W:0.3-0.6%, nb:0.1-0.4%, P is less than or equal to 0.05%, S is less than or equal to 0.05%, and the balance is Fe and unavoidable impurities;
and C, W, nb content satisfies the following relationship: [C] 12=k× ([ W ]/184+ [ Nb ]/93), wherein k=45-88, [ C ], [ W ], [ Nb ] represent the percentage of C, W, nb in the as-cast wear-resistant spheroidal graphite cast iron, respectively.
2. The as-cast wear-resistant ductile iron according to claim 1 further comprising Mg:0.02-0.06%, RE:0.01-0.03%.
3. Root of Chinese characterThe as-cast wear-resistant spheroidal graphite cast iron according to claim 1, wherein the as-cast spheroidal graphite cast iron has an as-cast hardness of 46HRC or more and room-temperature impact toughness KV 2 Is 50J or more.
4. An as-cast wear-resistant spheroidal graphite cast iron according to claim 1, wherein k=66-75 of the as-cast wear-resistant spheroidal graphite cast iron.
5. An as-cast wear-resistant ductile iron according to any one of claims 1 to 4 wherein said as-cast wear-resistant ductile iron is applied to wear-resistant parts.
6. The wear part of claim 5, wherein the wear part is a wear liner or a wear ball.
7. A method of producing an as-cast wear-resistant spheroidal graphite cast iron according to any one of claims 1 to 6, wherein the method comprises the steps of smelting, spheroidizing, inoculating, and casting.
8. Use of an as-cast wear-resistant spheroidal graphite cast iron according to any one of claims 1 to 7 in wear parts.
9. A wear part comprising the as-cast wear resistant ductile iron according to any one of claims 1 to 8.
10. A wear part according to claim 9, characterized in that the wear part is a wear lining or a grinding ball.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311376188.5A CN117144233A (en) | 2023-10-23 | 2023-10-23 | As-cast wear-resistant spheroidal graphite cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311376188.5A CN117144233A (en) | 2023-10-23 | 2023-10-23 | As-cast wear-resistant spheroidal graphite cast iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117144233A true CN117144233A (en) | 2023-12-01 |
Family
ID=88906334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311376188.5A Pending CN117144233A (en) | 2023-10-23 | 2023-10-23 | As-cast wear-resistant spheroidal graphite cast iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117144233A (en) |
-
2023
- 2023-10-23 CN CN202311376188.5A patent/CN117144233A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113025874A (en) | Hypereutectic high-chromium cast iron and inoculation modification treatment method thereof | |
| CN104087818A (en) | Low-chromium alloy wear-resisting ball and preparation method thereof | |
| CN109536664B (en) | Vermicular graphite cast iron vortex plate and production process thereof | |
| CN113897541A (en) | High-chromium wear-resistant steel ball and casting process thereof | |
| CN110423937B (en) | Alloyed gray cast iron resisting corrosion of high-temperature aluminum and zinc liquid and smelting process thereof | |
| CN109594007B (en) | Vermicular graphite cast iron and preparation process and application thereof | |
| CN115261713B (en) | Preparation method of high-hardness high-toughness wear-resistant high-chromium cast iron | |
| CN114231851B (en) | Nano carbide reinforced wear-resistant steel and preparation method and application thereof | |
| CN112680661B (en) | Alloy steel and preparation method thereof | |
| CN117144233A (en) | As-cast wear-resistant spheroidal graphite cast iron | |
| CN113737085B (en) | Nodular cast iron axle housing and manufacturing method thereof | |
| CN1425791A (en) | Wear resistant cast iron containing titanium-chromium and its heat treatment process | |
| CN117144232A (en) | Heat-treated hardened wear-resistant spheroidal graphite cast iron | |
| CN113337776A (en) | High-wear-resistance high-chromium white cast iron for pump and preparation method thereof | |
| KR102012428B1 (en) | C/V Griphite Cast Iron of Main Control Valve Housing | |
| CN113481425A (en) | High-wear-resistance high-chromium white cast iron and preparation method thereof | |
| CN115584430B (en) | High-pearlite-content gray cast iron with thick and large section and preparation method thereof | |
| CN111500923A (en) | Thick-wall nodular cast iron and preparation method thereof | |
| CN115287527B (en) | High-performance hypereutectic high-chromium cast iron without rare earth modifier and preparation method thereof | |
| CN111690867B (en) | Alloy cast iron and preparation method thereof | |
| CN114507807B (en) | Inoculant for increasing carbide amount and application method thereof in production of hypereutectic niobium-containing chromium 15 cast iron | |
| CN115747646B (en) | Lining plate and production method thereof | |
| Cheng et al. | Microstructure evolution and Wear resistance of Boron-Bearing HigH speed steel roll | |
| CN117210749A (en) | High-wear-resistance hypereutectic high-chromium white cast iron and preparation method and application thereof | |
| CN106119683A (en) | A kind of rigid high-abrasive material of high intensity |
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 |