Ejector valve seat material and preparation method thereof, ejector valve seat and ejector

Abstract

The invention relates to the technical field of engines, in particular to an ejector valve seat material, a preparation method thereof, an ejector valve seat and an ejector. The ejector valve seat material is prepared from the following components in percentage by mass: 13 percent to 24 percent of Cr, 0.3 percent to 2.2 percent of Mn, 0.2 percent to 1.2 percent of Si, 0.02 percent to 1.2 percent of C, 0 to 0.05 percent of P, 0 to 0.04 percent of S and the balance of Fe and inevitable impurity elements. The ejector valve seat is made of the ejector valve seat material. The wear resistance, methanol corrosion resistance and high-temperature hardness of the injector valve seat can be effectively improved, and the problems that a current methanol fuel injector valve seat is not resistant to corrosion and is prone to damage and failure in the using process can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to an injector valve seat material and a preparation method thereof, an injector valve seat and an injector. Background Art

[0002] Methanol has the characteristics of abundant raw materials, clean and environmentally friendly, and good power. With the continuous development of clean energy technology, methanol, as a renewable and environmentally friendly alternative fuel, is increasingly widely used in the field of transportation. Especially in heavy vehicles, ships and some specific industrial applications, methanol engines have received more attention for their advantages such as low emissions and high octane number. However, as one of the core components of methanol engines, the durability of methanol injectors directly affects the overall performance and service life of the engine. Since methanol is highly corrosive, long-term use will cause corrosion to the internal metal parts (such as needle valves, spray holes, etc.) of the injector (also known as the injector), resulting in decreased sealing and increased leakage. At the same time, impurities or incomplete combustion products in methanol may also aggravate wear. In addition, due to factors such as high operating temperature and high working pressure, the working conditions of direct injection injectors are more stringent. The valve seat of existing injectors is prone to irreversible damage after long-term operation, resulting in increased injector flow or even leakage.

[0003] In the related art, in order to alleviate the above-mentioned problem, the main method is to increase the strength of the valve seat material. However, the existing solutions have not shown ideal effects and are difficult to meet the requirements of the injector for the use of the valve seat material.

[0004] Therefore, in view of the problem that the valve seat of the current injector used for methanol fuel is not corrosion-resistant and easily damaged and fails during use, it is urgent to develop a new injector valve seat material to solve the above problems. Summary of the invention

[0005] In view of this, the present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, the present invention provides an injector valve seat material and a preparation method thereof, an injector valve seat and an injector, which can improve the wear resistance and methanol corrosion resistance of the injector valve seat, and effectively alleviate the problem that the valve seat of the current methanol fuel injector is not corrosion-resistant and is easily damaged and failed during use.

[0006] In order to solve the above technical problems, this application is implemented as follows:

[0007] According to one aspect of the present application, an embodiment of the present application provides an injector valve seat material, wherein the injector valve seat material includes the following components in percentage by mass:

[0008] Cr 13%~24%, Mn 0.3%~2.2%, Si 0.2%~1.2%, C 0.02%~1.2%, P 0~0.05%, S 0~0.04%, and the rest are Fe and unavoidable impurity elements.

[0009] In addition, the injector valve seat material according to the present application may also have the following additional technical features:

[0010] In some embodiments, the injector valve seat material includes the following components in mass percentage: Cr 16% to 22%, Mn 0.4% to 2%, Si 0.4% to 1%, C 0.03% to 1.08%, P 0.01% to 0.04%, S 0.01% to 0.03%, and the rest are Fe and unavoidable impurity elements.

[0011] In some embodiments, the injector valve seat material includes the following components in mass percentage: Cr 17% to 20%, Mn 0.8% to 1.5%, Si 0.5% to 0.9%, C 0.3% to 1%, P 0.01% to 0.04%, S 0.01% to 0.03%, and the rest are Fe and unavoidable impurity elements.

[0012] In some of the embodiments, the injector valve seat material further includes Mo; and the content of Mo is 0-4% by mass.

[0013] In some embodiments, the content of Mo is 0.01% to 3% by mass.

[0014] In some of the embodiments, the injector valve seat material further includes V; and the content of V is 0-0.4% by mass.

[0015] In some of the embodiments, the V content is 0.01% to 0.2% by mass.

[0016] In some embodiments, the hardness of the injector valve seat material is ≥ 45 HBR.

[0017] In some of the embodiments, the wear spot diameter of the injector valve seat material is ≤0.38 mm.

[0018] According to another aspect of the present application, an embodiment of the present application provides a method for preparing the injector valve seat material as described above, the method comprising the following steps:

[0019] According to the chemical components of Cr, Mn, Si, C, P, S, Fe, optional Mo and optional V, corresponding raw materials are mixed and then smelted, cast and formed, heat treated, and cooled to obtain the injector valve seat material.

[0020] In some embodiments, the smelting temperature is 1400°C to 1500°C.

[0021] In some embodiments, the heat treatment includes: heating the cast blank to 850°C to 950°C, maintaining the temperature for 40min to 60min, and then cooling the blank to 720°C to 760°C for 3h to 4h, wherein the cooling rate is ≤20°C / h.

[0022] According to another aspect of the present application, an embodiment of the present application provides an injector valve seat, wherein the injector valve seat is made of the injector valve seat material as described above or the injector valve seat material obtained by the aforementioned method.

[0023] According to still another aspect of the present application, an embodiment of the present application provides an injector, wherein the injector includes the aforementioned injector valve seat.

[0024] Implementing the technical solution of the present invention has at least the following beneficial effects:

[0025] In the embodiment of the present application, the provided injector valve seat material includes the following components in mass percentage: Cr13%-24%, Mn 0.3%-2.2%, Si 0.2%-1.2%, C 0.02%-1.2%, P 0-0.05%, S 0-0.04%, and the rest are Fe and inevitable impurity elements. Thus, through the mutual cooperation of the selected elements, a more stable alloy material can be prepared, and the strength, hardness, corrosion resistance and wear resistance of the alloy material are improved. Furthermore, the injector valve seat with good wear resistance and excellent methanol corrosion resistance can be prepared by the injector valve seat material, and has good thermal stability and high temperature strength, which can effectively alleviate the problem of easy damage and failure of the injector valve seat during operation, and can not only improve the service life of the injector (especially the methanol injector) using the injector valve seat, but also reduce or avoid the methanol leakage phenomenon of the methanol injector, and improve the stability of the flow rate of the methanol injector.

[0026] Additional aspects and advantages of the present application will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 FIG. 1 is a schematic diagram of the structure of an injector provided by an embodiment of the present invention (the enlarged portion in the figure is a schematic diagram of the injector valve seat);

[0028] Figure 2 It is a schematic diagram showing the comparison of high temperature hardness of Examples 1-6 of the present invention and Comparative Examples 1-4;

[0029] Figure 3 Shown is a schematic diagram comparing the metal wear resistance of Examples 1-6 of the present invention and Comparative Examples 1-4;

[0030] Figure 4 It is a schematic diagram showing the comparison of methanol corrosion resistance of Examples 1-6 of the present invention and Comparative Examples 1-4;

[0031] Figure 5 Shown is a schematic diagram comparing the durable flow rate changes of the fuel injectors of Examples 1-6 of the present invention and Comparative Examples 1-4. DETAILED DESCRIPTION

[0032] The present application is further described below in conjunction with specific embodiments. It should be understood that these embodiments of the present application are only used to illustrate the present application and are not used to limit the scope of the present application.

[0033] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range or the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0034] If there is no special explanation, the "include" and "comprising" mentioned in this application are open-ended or closed-ended. For example, the "include" and "comprising" may mean that other components not listed may also be included or only the listed components may be included or only the listed components may be included.

[0035] The core of the present invention is to provide an injector valve seat material and a preparation method thereof, as well as an injector valve seat and an injector comprising the injector valve seat. The injector valve seat material can meet the use requirements of the valve seat for the methanol injector. By adopting the injector valve seat material, the problem that the valve seat of the existing methanol direct injection system injector is easily damaged and failed during use can be effectively alleviated, resulting in poor sealing of the injector and causing engine jitter, which in turn causes engine failure.

[0036] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with specific embodiments.

[0037] In some embodiments, an injector valve seat material is provided, the injector valve seat material comprising the following components in percentage by mass:

[0038] Cr 13%~24%, Mn 0.3%~2.2%, Si 0.2%~1.2%, C 0.02%~1.2%, P 0~0.05%, S 0~0.04%, and the rest are Fe and unavoidable impurity elements.

[0039] The valve seat material provided in the embodiment of the present invention is an alloy material, which can meet the performance requirements of the valve seat for the methanol injector for its alloy material, and can alleviate the problem that the valve seat of the current methanol fuel injector is not corrosion-resistant and is easily damaged and failed during use. In detail:

[0040] The injector valve seat material contains Fe (iron), Cr (chromium), Mn (manganese), C (carbon), Si (silicon), and a small amount of S (sulfur), P (phosphorus) and other elements. Among them, the addition of Cr element will increase the amount of ferrite formed during smelting, and the combination of C (carbon) element can maintain the austenite structure formed by the alloy at high temperature and adjust the plasticity of the material; and the Cr element can form a stable chromium oxide film on the surface of the alloy, which can effectively inhibit the corrosion of methanol fuel. The auxiliary addition of a small amount of Mn and Si elements can make the alloy material's anti-oxidation and methanol corrosion inhibition effect better. In addition, the Mn element can also improve the material's hot processing ability and increase the material's strength. The Si element can also improve the mechanical properties and wear resistance of the alloy steel. The addition of C element can cooperate with Cr element to maintain the austenite structure formed by the alloy material at high temperature and adjust the plasticity of the material. The Fe element has a low production cost, helps to increase the mixing entropy of the material, reduce the order and segregation tendency of the alloy material during the cooling and solidification process, and form a more stable solid solution. In addition, the Cr element can form a continuous solid solution with Fe and other elements, which is beneficial to improve the mechanical properties of the alloy material, such as hardness, strength, and strong wear resistance. In addition, adding a small amount of P, S and other elements can refine the grains, reduce the material's overheating sensitivity and temper brittleness, and improve strength or corrosion resistance such as atmospheric corrosion. The combined use of Fe, Cr, Mn, C, Si and a small amount of S, P and other elements is conducive to the preparation of a more stable alloy material with good high temperature and high pressure performance and methanol corrosion resistance, which improves its comprehensive performance and can fundamentally solve the problem of easy damage to the injector valve seat during operation.

[0041] In some preferred embodiments, the injector valve seat material may also include a small amount of Mo (molybdenum) element and V (vanadium) element. By adding the Mo element, the high-temperature brittleness of the alloy material can be improved. By adding the V element, the toughness and wear resistance of the alloy material can be improved, or it can also refine the grains and improve the strength, toughness, corrosion resistance and other properties of the material.

[0042] The present invention can effectively control the content of each element in the alloy within a reasonable range according to the different roles played by each element in the injector valve seat. At the same time, the content of each element can be adjusted within a wider range according to the needs of actual use, which greatly facilitates the preparation process and facilitates processing and manufacturing. Through the role of each element and the synergistic effect between the elements, it has good corrosion resistance, wear resistance, high temperature performance and other properties, and can meet the application requirements of the methanol injector valve seat.

[0043] In the embodiment of the present application, the components of the injector valve seat are: Cr mass percentage range is 13% to 24%, Mn mass percentage range is 0.3% to 2.2%, Si mass percentage range is 0.2% to 1.2%, C mass percentage range is 0.02% to 1.2%, P 0 to 0.05%, S mass percentage range is 0 to 0.04%, and the rest are Fe and unavoidable impurity elements.

[0044] In some preferred embodiments, the injector valve seat material includes the following components, measured by mass percentage: Cr 16% to 22%, Mn 0.4% to 2%, Si 0.4% to 1%, C 0.03% to 1.08%, P 0.01% to 0.04%, S 0.01% to 0.03%, and the rest are Fe and unavoidable impurity elements.

[0045] In some preferred embodiments, the injector valve seat material includes the following components, measured by mass percentage: Cr 17% to 20%, Mn 0.8% to 1.5%, Si 0.5% to 0.9%, C 0.3% to 1%, P 0.01% to 0.04%, S 0.01% to 0.03%, and the rest are Fe and unavoidable impurity elements.

[0046] In the provided injector valve seat, the mass percentage of Cr ranges from 13% to 24%, preferably from 16% to 22%, and more preferably from 17% to 20%. As an example, the mass percentage of Cr can be any point value of 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, or a range value between any two of them. After research and analysis or in combination with price factors, by controlling the mass content of the Cr element within the above range, it can effectively increase the amount of ferrite formed during smelting, and the carbon element can maintain the austenite structure formed by the alloy at high temperature, and adjust the plasticity of the material. In addition, within the above content range, the Cr element can form a stable chromium oxide film on the surface of the alloy, effectively inhibiting the corrosion of methanol fuel, and helping to improve the comprehensive performance of the material.

[0047] In the provided injector valve seat, the mass percentage of Mn ranges from 0.3% to 2.2%, preferably from 0.4% to 2%, and more preferably from 0.8% to 1.5%. As an example, the mass percentage of Mn can be any point value of 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.2%, 1.4%, 1.5%, 1.6%, 1.8%, 2%, 2.2%, or any range value between two of them. After research and analysis or in combination with price factors, by controlling the mass content of the Mn element within the above range, the alloy material can be effectively made to have a better anti-oxidation and methanol corrosion inhibition effect, and it is more conducive to improving the thermal processing ability of the material, which is conducive to improving the comprehensive performance of the material.

[0048] In the provided injector valve seat, the mass percentage of Si ranges from 0.2% to 1.2%, preferably from 0.4% to 1%, and more preferably from 0.5% to 0.9%. As an example, the mass percentage of Si can be any point value of 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, or any range value between two of them. After research and analysis or in combination with price factors, by controlling the mass content of Si element within the above range, it can effectively play a role in making the alloy material more anti-oxidative and inhibiting methanol corrosion, and is more conducive to improving the mechanical properties and wear resistance of the alloy material.

[0049] In the provided injector valve seat, the mass percentage of C ranges from 0.02% to 1.2%, preferably from 0.03% to 1.08%, and more preferably from 0.3% to 1%. As an example, the mass percentage of C can be any point value or a range value between any two of 0.02%, 0.03%, 0.05%, 0.06%, 0.07%, 0.08%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.7%, 0.8%, 0.9%, 1%, 1.08%, 1.1%, and 1.2%. Through research and analysis, it is found that by controlling the mass content of the C element within the above range, it can be matched with the content of the Cr element, which is conducive to the C element and the Cr element to maintain the austenite structure formed by the alloy material at high temperature, adjust the plasticity of the material, and reduce the influence on other properties such as the strength of the material.

[0050] In the provided injector valve seat, the mass percentage of P ranges from 0% to 0.05%, preferably from 0.01% to 0.04%, and more preferably from 0.02% to 0.03%. As an example, the mass percentage of P can be any one of 0, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, or a range between any two of them. Through research and analysis, it is found that by controlling the mass content of the P element within the above range, it is beneficial to improve the strength of the alloy material, improve the hot working performance of the alloy material, and reduce the impact on the comprehensive performance of the material.

[0051] In the provided injector valve seat, the mass percentage of S ranges from 0% to 0.04%, preferably from 0.01% to 0.035%, and more preferably from 0.01% to 0.03%. As an example, the mass percentage of S can be any one of 0, 0.01%, 0.02%, 0.03%, 0.035%, 0.04%, or a range between any two of them. Through research and analysis, it is found that by controlling the mass content of the S element within the above range, it is beneficial to improve the strength of the alloy material, improve the hot working performance of the alloy material, and reduce the impact on the comprehensive performance of the material.

[0052] After the mass percentages of the above elements are determined, the remainder is Fe and unavoidable impurities.

[0053] It should be understood that the above are the main components and proportions of the alloy material. It should be noted that in practice, the alloy material will inevitably contain other impurities (the mass percentage of impurities is low, such as less than 0.1% or less than 0.05%).

[0054] Through the action of various elements and the synergistic effect between the elements, this alloy material has good cutting performance, corrosion resistance, hot and cold processing performance, as well as good resistance to stress corrosion and dezincification corrosion, and can meet the application requirements of refrigeration system valves.

[0055] Further, in some embodiments, the provided injector valve seat material also includes Mo.

[0056] Further, in some embodiments, the provided injector valve seat material also includes V.

[0057] In the present application, the Mo element and the V element are optional elements in the injector valve seat material, that is, in some embodiments, the Mo element and / or the V element may be added; or, in other embodiments, the Mo element and / or the V element may not be added.

[0058] In the provided injector valve seat, the mass percentage of Mo ranges from 0% to 4%, preferably from 0.01% to 3%, and more preferably from 0.1% to 2%. As an example, the mass percentage of Mo can be any point value of 0, 0.01%, 0.02%, 0.04%, 0.05%, 0.1%, 0.2%, 0.4%, 0.5%, 0.6%, 0.75%, 0.8%, 0.9%, 1%, 1.2%, 1.5%, 2%, 2.5%, 3%, 4%, or any range value between two of them. Through research and analysis, it is found that by controlling the mass content of the Mo element within the above range, the high temperature brittleness of the alloy material can be better improved, which is beneficial to improving the comprehensive performance of the alloy material.

[0059] In the provided injector valve seat, the mass percentage of V ranges from 0% to 0.4%, preferably from 0.01% to 0.3%, and more preferably from 0.01% to 0.2%. As an example, the mass percentage of V can be any point value of 0, 0.01%, 0.02%, 0.04%, 0.05%, 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, or any range value between two of them. Through research and analysis, it is found that by controlling the mass content of the V element within the above range, the toughness and wear resistance of the alloy material can be better improved, or it can also refine the grains, improve the strength, toughness, corrosion resistance and other properties of the material, and help improve the comprehensive performance of the alloy material.

[0060] In some embodiments, the hardness of the injector valve seat material is ≥ 45 HBR. It should be noted that the hardness is a high temperature hardness obtained by testing at a high temperature (about 100° C.).

[0061] In some embodiments, the wear spot diameter of the injector valve seat material is ≤ 0.38 mm.

[0062] Therefore, the injector valve seat material provided by the embodiment of the present invention has higher high temperature hardness and good wear resistance.

[0063] In some embodiments, a method for preparing the injector valve seat material as described above is also provided, the method comprising:

[0064] According to the chemical components of Cr, Mn, Si, C, P, S, Fe, optional Mo and optional V, corresponding raw materials are mixed and then smelted, cast and formed, heat treated, and cooled to obtain the injector valve seat material.

[0065] It should be understood that the above-mentioned “optional Mo” and “optional V” mean that Mo and V are optional elements. For example, in some embodiments, Mo element and / or V element may be added; or, in other embodiments, Mo element and / or V element may not be added.

[0066] In the present application, the injector valve seat provided can be prepared by a conventional preparation method of alloy materials. The preparation method has simple process, convenient operation, easy control, strong feasibility, and easy to realize industrial application.

[0067] It should be understood that all the features and advantages described above for the “injector valve seat material” are also applicable to the “method for preparing the injector valve seat material” and will not be described in detail here.

[0068] In some embodiments, the smelting temperature is 1400°C to 1500°C; as an example, the smelting temperature may be 1400°C, 1410°C, 1420°C, 1460°C, 1480°C, 1500°C, etc.

[0069] In some embodiments, the heat treatment includes: heating the blank after casting to 850℃~950℃, maintaining for 40min~60min, and then cooling to 720℃~760℃ for 3h~4h, and the cooling rate is ≤20℃ / h. As an example, the blank after casting is heated to 850℃, 860℃, 870℃, 880℃, 890℃, 900℃, 910℃, 920℃, 950℃, etc., maintaining for 40min, 45min, 50min, 55min, 60min, etc., and then cooling to 720℃, 730℃, 740℃, 750℃, 760℃, etc. for 3h, 3.5h, 4h, etc., wherein the cooling needs to be slow, such as the cooling rate needs to not exceed 20℃ / h.

[0070] In some specific embodiments, the method for preparing the solid electrolyte comprises the following steps:

[0071] Using the vacuum melting process, the raw materials of each element are weighed according to the ratio and put into the melting furnace. The temperature in the furnace is controlled at 1400-1500℃ for melting to make the raw materials completely melt to form molten steel. Then, after the molten steel is evenly mixed, it is degassed, impurity-removed and temperature-controlled to remove impurities and gases in the molten steel.

[0072] After casting and forming, such as continuous casting and hot rolling, heat treatment is carried out. The heat treatment process includes: heating the steel billet to 850-950°C and keeping it for 40-60 minutes to eliminate internal stress; then, slowly lowering the temperature, keeping the cooling rate no higher than 20°C / h, cooling to 720-760°C and keeping it for 3-4 hours, cooling to room temperature to obtain the injector valve seat material.

[0073] In some embodiments, an injector valve seat is provided. The injector valve seat is made of the aforementioned injector valve seat material or the injector valve seat material made by the aforementioned method.

[0074] In some embodiments, an injector is provided. The injector includes the injector valve seat described above.

[0075] Since the injector and injector valve seat provided in the embodiment of the present invention adopt all the technical solutions of the above embodiments, they at least have all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0076] It should be understood that the specific shape and structure of the injector valve seat and the injector can refer to the relevant prior art, and the specific working principle is also known in the prior art, and the present application does not limit this.

[0077] In order to better understand the present invention, the specific implementation process of the present invention will be described in detail below in a specific implementation mode. The implementation methods described below are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application. If no specific technology or conditions are specified in the implementation method, the technology or conditions described in the literature in the field or the product specification shall be followed.

[0078] The present invention designs materials from aspects such as the thermal stability, high temperature strength, and methanol corrosion resistance of alloy materials, and uses the actual effect of a direct injection injector made of a metal material as a substrate after a single body durability test as a final evaluation basis.

[0079] Example 1

[0080] In terms of mass percentage, the injector valve seat material includes the following components:

[0081] Fe: 81.87%;

[0082] Cr: 16%;

[0083] Si: 1%;

[0084] Mn: 1%;

[0085] C: 0.07%;

[0086] P: 0.03%;

[0087] S: 0.03%.

[0088] Example 2

[0089] In terms of mass percentage, the injector valve seat material includes the following components:

[0090] Fe: 71.9%;

[0091] Cr: 22%;

[0092] Si: 1%;

[0093] Mn: 2%;

[0094] C: 0.03%;

[0095] P: 0.04%;

[0096] S: 0.03%;

[0097] Mo: 3%.

[0098] Example 3

[0099] In terms of mass percentage, the injector valve seat material includes the following components:

[0100] Fe: 78.24%;

[0101] Cr: 18%;

[0102] Si: 0.9%;

[0103] Mn: 0.8%;

[0104] C: 0.8%;

[0105] P: 0.03%;

[0106] S: 0.03%;

[0107] Mo: 1.2%.

[0108] Example 4

[0109] In terms of mass percentage, the injector valve seat material includes the following components:

[0110] Fe: 79.1%;

[0111] Cr: 17%;

[0112] Si: 1%;

[0113] Mn: 1%;

[0114] C: 1.08%;

[0115] P: 0.04%;

[0116] S: 0.03%;

[0117] Mo: 0.75%.

[0118] Example 5

[0119] In terms of mass percentage, the injector valve seat material includes the following components: Fe: 80.1%;

[0120] Cr: 17%;

[0121] Si: 0.4%;

[0122] Mn: 0.4%;

[0123] C: 0.4%;

[0124] Mo: 1.5%;

[0125] V: 0.2%.

[0126] Example 6

[0127] In terms of mass percentage, the injector valve seat material includes the following components: Fe: 84.04%;

[0128] Cr: 13%;

[0129] Si: 0.8%;

[0130] Mn: 1%;

[0131] C: 0.3%;

[0132] P: 0.03%;

[0133] S: 0.03%;

[0134] Mo: 0.8%.

[0135] Comparative Example 1

[0136] In terms of mass percentage, the injector valve seat material includes the following components: Fe: 96.32%;

[0137] Cr: 1.5%;

[0138] Si: 0.3%;

[0139] Mn: 0.5%;

[0140] C: 1.3%;

[0141] P: 0.035%;

[0142] S: 0.045%.

[0143] Comparative Example 2

[0144] In terms of mass percentage, the injector valve seat material includes the following components: Fe: 96.98%;

[0145] Cr: 1%;

[0146] Si: 0.3%;

[0147] Mn: 0.7%;

[0148] C: 0.45%;

[0149] P: 0.25%;

[0150] S: 0.02%;

[0151] Mo: 0.3%.

[0152] Comparative Example 3

[0153] In terms of mass percentage, the injector valve seat material includes the following components:

[0154] Fe: 88.54%;

[0155] Cr: 5.2%;

[0156] Si: 0.5%;

[0157] Mn: 0.1%;

[0158] C: 0.4%;

[0159] P: 0.03%;

[0160] S: 0.03%;

[0161] Mo: 4.2%;

[0162] V: 1%.

[0163] Comparative Example 4

[0164] In terms of mass percentage, the injector valve seat material includes the following components:

[0165] Fe: 71.36%;

[0166] Cr: 25%;

[0167] Si: 1.5%;

[0168] Mn: 2%;

[0169] C: 0.08%;

[0170] P: 0.03%;

[0171] S: 0.03%.

[0172] In the present application, the injector alloy materials of the above-mentioned embodiments 1-6 and comparative examples 1-4 can be prepared by the following method:

[0173] Using vacuum melting process, the raw materials of each element are weighed according to the proportion and then put into the melting furnace, and the temperature in the furnace is controlled at 1400-1500℃, and the raw materials are completely melted to form molten steel; then, after the molten steel is evenly mixed, it is degassed, impurity-removed, and temperature-adjusted to remove impurities and gases in the molten steel. Then, after casting and forming, such as continuous casting and hot rolling, heat treatment is carried out. The heat treatment process includes: heating the steel billet to 850-950℃, maintaining it for 40-60 minutes to eliminate internal stress; then, slowly reducing the temperature, maintaining the cooling rate no higher than 20℃ / h, cooling to 720-760℃ and keeping it warm for 3-4 hours, cooling to room temperature, and obtaining the injector valve seat material.

[0174] It should be understood that in the preparation process of the alloy materials of the above-mentioned embodiments and comparative examples, the main change is the raw material ratio or raw material type, while the operating conditions such as temperature and time can be the same. For example, the same conditions can be selected within the range of the above-mentioned time and temperature conditions for preparation, and this application does not limit this.

[0175] Effect Examples In order to strongly support the beneficial effects of the embodiments of the present application, the effect examples are provided as follows, which are used to evaluate the performance of the products provided by the embodiments of the present application.

[0176] The present invention synthesizes different alloy materials according to mass ratio, cuts the alloy materials into samples of different shapes for performance testing, first screens the materials through monomer tests including high temperature hardness test, wear resistance test, methanol corrosion resistance test, and finally passes the methanol direct injection injector test.

[0177] 1) The injector valve seat materials obtained in the above-mentioned embodiments and comparative examples were subjected to a high temperature hardness test.

[0178] High-temperature hardness test The high-temperature hardness tester indentation method was used to compare the hardness. The hardness of the samples of each embodiment and comparative example at 100° C. was tested using a high-temperature Rockwell hardness tester.

[0179] Test results such as Figure 2 shown.

[0180] 2) The injector valve seat materials obtained in the above-mentioned embodiments and comparative examples were subjected to a wear resistance test.

[0181] The wear resistance test was conducted in a methanol solution using a high-frequency reciprocating test machine. The wear scar width was compared. The smaller the wear scar, the higher the wear resistance. The methanol solution was industrial methanol (first-class product). The valve seat materials of each embodiment and comparative example were processed into friction bottom plates and tested under the conditions of a load of 2N, a frequency of 50Hz, and a time of 60min.

[0182] Test results such as Figure 3 shown.

[0183] 3) The injector valve seat materials obtained in the above embodiments and comparative examples were subjected to a methanol corrosion resistance test.

[0184] The methanol corrosion resistance test compares the corrosion resistance effect by the weight loss rate of the sample after immersion in a methanol solution containing formic acid and water. Among them, the immersion solution is prepared by weight ratio industrial methanol (first-class product): formic acid: water = 95:1:4 to obtain the immersion solution. The injector valve seat materials obtained in each embodiment and comparative example are immersed for 120 hours at 40°C, and the ratio of the mass loss of the sample after immersion to the initial weight is the weight loss rate.

[0185] Test results such as Figure 4 shown.

[0186] 4) The injector valve seat materials obtained from the above-mentioned embodiments and comparative examples were subjected to a methanol direct injection injector (durability test) test.

[0187] The comparison of the injector's durable stable operation time (injector's durable flow rate change) is used as the final material effect comparison.

[0188] Test results such as Figure 5 shown.

[0189] from Figures 2 to 5 It can be seen that the durability of the injector valve seat material in the injector is closely related to the high-temperature hardness, wear resistance and corrosion resistance, and the injector valve seat material provided in Examples 1-6 of the present invention improves the high-temperature hardness, wear resistance and methanol corrosion resistance of the material, extends the service life of the injector valve seat, and can fundamentally solve the problem that the injector valve seat is easily damaged during operation.

[0190] Parts of the present invention that are not described in detail are well known to those skilled in the art.

[0191] The basic principle of the present invention is described above in conjunction with specific embodiments. However, it should be pointed out that the advantages, strengths, effects, etc. mentioned in the present invention are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. must be possessed by each embodiment of the present invention. In addition, the specific details disclosed above are only for the purpose of illustration and facilitation of understanding, rather than limitation, and the above details do not limit the present invention to being implemented by adopting the above specific details.

[0192] It should be noted that the term "and / or" or " / " used in this document is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The singular forms of "a", "the" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0193] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An injector valve seat material, characterized in that: The injector valve seat material includes the following components in percentage by mass: Cr 13%~24%, Mn 0.3%~2.2%, Si 0.2%~1.2%, C 0.02%~1.2%, P 0~0.05%, S 0~0.04%, and the rest are Fe and unavoidable impurity elements.

2. The injector valve seat material according to claim 1, characterized in that: The injector valve seat material includes the following components in percentage by mass: Cr 16%~22%, Mn 0.4%~2%, Si 0.4%~1%, C 0.03%~1.08%, P 0.01%~0.04%, S 0.01%~0.03%, and the rest are Fe and unavoidable impurity elements.

3. The injector valve seat material according to claim 1, characterized in that: The injector valve seat material includes the following components in percentage by mass: Cr 17%~20%, Mn 0.8%~1.5%, Si 0.5%~0.9%, C 0.3%~1%, P 0.01%~0.04%, S 0.01%~0.03%, and the rest are Fe and unavoidable impurity elements.

4. The injector valve seat material according to any one of claims 1 to 3, characterized in that: The injector valve seat material also includes Mo; Calculated by mass percentage, the content of Mo is 0-4%; Preferably, the content of Mo is 0.01% to 3% by mass.

5. The injector valve seat material according to any one of claims 1 to 3, characterized in that: The injector valve seat material also includes V; Calculated by mass percentage, the content of V is 0-0.4%; Preferably, the V content is 0.01% to 0.2% by mass.

6. The injector valve seat material according to any one of claims 1 to 3, characterized in that: The hardness of the injector valve seat material is ≥45HBR; And / or, the wear spot diameter of the injector valve seat material is ≤0.38 mm.

7. The method for preparing the injector valve seat material according to any one of claims 1 to 6, characterized in that: The method comprises: According to the chemical components of Cr, Mn, Si, C, P, S, Fe, optional Mo and optional V, corresponding raw materials are mixed and then smelted, cast and formed, heat treated, and cooled to obtain the injector valve seat material.

8. The method for preparing the injector valve seat material according to claim 7, characterized in that: The smelting temperature is 1400°C to 1500°C; And / or, the heat treatment includes: heating the cast blank to 850°C-950°C, maintaining the temperature for 40min-60min, and then cooling the blank to 720°C-760°C and maintaining the temperature for 3h-4h, wherein the cooling rate is ≤20°C / h.

9. An injector valve seat, characterized in that: The injector valve seat is made of the injector valve seat material described in any one of claims 1 to 6 or the injector valve seat material obtained by the method described in any one of claims 7 to 8.

10. An ejector, characterized in that: The injector comprises the injector valve seat of claim 9 .

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