Standard sample for hardenability consistency detection and preparation method and detection method thereof

Abstract

The invention relates to a standard sample for hardenability consistency detection and a preparation method and a detection method thereof. The preparation method of the standard sample for hardenability consistency detection comprises the following steps that 20CrNiMo alloy is smelted in a non-vacuum induction heating and electroslag remelting mode, then normalizing treatment is conducted, and the cylindrical standard sample is obtained through machining and forming; the 20CrNiMo alloy is prepared from the following elements in percentage by mass: 0.22 percent to 0.23 percent of C, 0.30 percent to 0.35 percent of Si, 0.75 percent to 0.85 percent of Mn, 0 to 0.02 percent of P, 0 to 0.025 percent of S, 0.50 percent to 0.60 percent of Cr, 0.50 percent to 0.60 percent of Ni and 0.15 percent to 0.25 percent of Mo. When the standard sample prepared by the method is used as a standard sample for hardenability consistency detection, the accuracy of a hardenability consistency detection result can be improved.

Description

Technical Field

[0001] The present invention relates to the field of detection technology, and in particular to a standard sample for hardenability consistency detection and a preparation method and a detection method thereof. Background Art

[0002] Hardenability is an important parameter indicator of steel, which refers to the characteristics that determine the hardening depth and hardness distribution of steel under specified conditions.

[0003] The better the hardenability of steel, the better its mechanical properties. Specifically, the better the hardenability of steel, the deeper the hardened layer can be obtained after quenching, so that the parts have uniform high hardness and high strength across the entire cross-section. Parts with good hardenability can maintain a high hardness after surface wear, thereby improving the wear resistance of the parts. In addition, the hardenability index of steel can also affect the heat treatment process. Hardenability determines the cooling rate required for steel during quenching. Steel with good hardenability can be quenched at a slower cooling rate, thereby reducing the risk of quenching deformation and cracking. For large parts or parts with complex shapes, steel with good hardenability can ensure that the entire part can obtain a uniform quenching effect and improve the quality of heat treatment.

[0004] At present, there are two main methods for determining the hardenability of steel: the end quenching method and the critical diameter method. Among them, the end quenching method is a commonly used method for determining hardenability. It is to heat the standard sample to the austenitizing temperature, quench it in a specific quenching medium, and then measure the distance from the end of the sample to the point where the hardness changes, so as to indicate the hardenability of the steel. The critical diameter refers to the maximum diameter that the steel can be completely hardened in a certain quenching medium; by measuring the hardenability of steel bars of different diameters in a specific quenching medium, the critical diameter of the steel can be determined, thereby evaluating the hardenability of the steel.

[0005] The control of the "hardenability" of steel is a core technical indicator, and it is also an indicator that is difficult to control in the inspection technology. At present, there is often a problem that the data obtained by different laboratories for the same steel are very different. This is mainly because there are many links in the entire inspection process. The processing technology, heat treatment and other inspection links of the sample will have an impact on the test results; this also makes it impossible to directly judge the main reason for the difference, such as whether it is caused by the processing technology of the sample itself or the influence of various inspection links such as heat treatment. Therefore, the consistency of the test results obtained by different laboratories or different testing methods cannot be guaranteed, and the accuracy of the test cannot be judged. Summary of the invention

[0006] Based on this, it is necessary to provide a standard sample and its preparation method and detection method that can evaluate or detect the consistency of the hardenability of steel by different methods.

[0007] In a first aspect of the present application, a method for preparing a standard sample for hardenability consistency detection is provided, comprising the following steps:

[0008] The 20CrNiMo alloy was smelted by non-vacuum induction heating and electroslag remelting, and then normalized and processed to obtain a cylindrical standard sample.

[0009] Among them, 20CrNiMo alloy includes the following elements by mass percentage: 0.22%~0.23% C, 0.30%~0.35% Si, 0.75%~0.85% Mn, 0~0.02% P, 0~0.025% S, 0.50%~0.60% Cr, 0.50%~0.60% Ni, and 0.15%~0.25% Mo.

[0010] The 20CrNiMo alloy with the above specific composition is used as the raw material of the standard sample, and it is smelted by non-vacuum induction heating and electroslag remelting to improve the component purity and organizational consistency of the 20CrNiMo alloy, and then normalized and processed to obtain a standard sample with higher component purity and organizational consistency. The obtained standard sample is used as the standard sample for hardenability consistency detection, which can improve the accuracy of the hardenability consistency detection result.

[0011] In some embodiments, the normalizing treatment is performed at a temperature of 900° C. to 920° C. and for a time of 80 minutes to 100 minutes.

[0012] In some of the embodiments, the 20CrNiMo alloy is a rod with a diameter of 35 mm.

[0013] In some embodiments, the cylindrical standard sample includes an end with a larger diameter and an end with a smaller diameter connected to each other, and the length of the end with the larger diameter is shorter than the length of the end with the smaller diameter.

[0014] In some embodiments, the diameter of the larger diameter end is 30 mm to 32 mm, the diameter of the smaller diameter end is 25 mm ± 0.3 mm, the length of the larger diameter end is 3 mm, and the length of the smaller diameter end is 100 mm ± 0.3 mm.

[0015] In a second aspect of the present application, a standard sample for hardenability consistency testing is provided, which is prepared by any of the preparation methods described above.

[0016] In a third aspect of the present application, a method for detecting hardenability consistency is provided, comprising the following steps:

[0017] Using a first method to perform a hardenability test on a first standard sample using an end quenching method to obtain a first hardness value of the first standard sample at a first position;

[0018] Using the second method to perform hardenability testing on the second standard sample using the end quenching method, and obtaining a second hardness value of the second standard sample at the first position; the first standard sample and the second standard sample are both the standard samples as described above, and have the same size and shape;

[0019] Determine whether the difference between the first hardness value and the second hardness value is within a preset range, and obtain the consistency test results of the first method and the second method for the hardenability of the steel according to the determination result;

[0020] If the difference between the first hardness value and the second hardness value is within the preset range, the first method and the second method are consistent in the hardenability test results of the steel; otherwise, they are inconsistent.

[0021] In some embodiments, the cylindrical standard sample includes an end with a larger diameter and an end with a smaller diameter connected to each other, the length of the end with a larger diameter is less than the length of the end with a smaller diameter, the end face of the end with a smaller diameter of the standard sample is a quenched end face, and the first position includes a plurality of positions where the distance between the side wall of the end with a smaller diameter of the standard sample and the quenched end face is 1.5 mm, 3 mm, 5 mm, 7 mm, 9 mm, 11 mm, 13 mm, 15 mm, 20 mm, 25 mm, and 30 mm;

[0022] Comparing the first hardness values ​​of the first standard sample at the plurality of positions with the second hardness values ​​of the second standard sample at the plurality of positions in a one-to-one correspondence manner, determining whether the differences between the first hardness values ​​and the second hardness values ​​at the plurality of positions are all within a preset range, and obtaining the consistency test results of the first method and the second method for the hardenability of the steel according to the determination result;

[0023] If the differences between the first hardness values ​​and the second hardness values ​​at the multiple positions are all within the preset range, the first method and the second method are consistent in the hardenability test results of the steel; otherwise, they are not consistent.

[0024] In some embodiments, the first hardness value and the second hardness value are both Rockwell hardness, and the preset range is within ±1HRC.

[0025] In some embodiments, using the first method to perform hardenability testing on the first standard sample using an end quenching method comprises the following steps:

[0026] The first standard sample is subjected to a heating treatment at a temperature of 880±5° C. for 65 minutes;

[0027] The first standard sample after the heating treatment is subjected to an end quenching test, wherein the water spraying time of the end quenching test is 10 minutes and the water temperature is controlled at 20±5°C;

[0028] Wherein, the time interval between taking out the first standard sample from the state of the heating treatment and starting the end quenching test is controlled to be no more than 5 seconds. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG1 is a schematic diagram of the structure of a standard sample according to an embodiment;

[0030] FIG2 is a schematic structural diagram of an end quenching device according to an embodiment;

[0031] FIG3 is a schematic diagram of the free height of a water jet in a water jet pipe in an end quenching device according to one embodiment;

[0032] FIG4 is a schematic structural diagram of a sampling position of a standard sample for hardenability testing using an end quenching method according to an embodiment of the present invention from a viewing angle;

[0033] FIG. 5 is a schematic structural diagram showing another perspective of the sampling position of the standard sample for hardness value of hardenability test using the end quenching method according to an embodiment.

[0034] Description of reference numerals:

[0035] 10. Standard sample; 11. Larger diameter end; 12. Smaller diameter end; 20. Sample positioning and centering device; 31. Water supply pipe; 32. Water spray pipe; 33. Quick switch valve; 34. Disc. DETAILED DESCRIPTION

[0036] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. It should be understood that the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0038] "Scope" disclosed in the present application can be limited in the form of lower limit and upper limit, and a given range is limited by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of a special range. The scope limited in this way can be including end values ​​or excluding end values, and any end value can be included or not included independently, and can be combined arbitrarily, that is, any lower limit can be combined with any upper limit to form a scope. For example, if the scope of 60-120 and 80-110 is listed for a specific parameter, it is understood that the scope of 60-110 and 80-120 is also expected. In addition, if the minimum range values ​​1 and 2 listed, and if the maximum range values ​​3,4 and 5 are also listed, the following scope can all be expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In the present application, unless otherwise specified, the numerical range "ab" represents the abbreviation of any real number combination between a and b, wherein a and b are real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" are listed in this document, and "0-5" is just an abbreviation of these numerical combinations. In addition, when a parameter is expressed as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc. For example, when a parameter is expressed as an integer selected from "2-10", it is equivalent to listing the integers 2, 3, 4, 5, 6, 7, 8, 9 and 10.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In the present application, "plurality", "multiple" and the like, unless otherwise specified, refer to a number greater than or equal to 2. For example, "one or more" means one or greater than or equal to two.

[0041] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0042] Those skilled in the art will appreciate that, in the methods of each embodiment or example, the order in which each step is written does not mean a strict order of execution and does not constitute any limitation on the implementation process, and the detailed order of execution of each step should be determined by its function and possible internal logic. If there is no special explanation, all steps of the present application can be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or steps (b) and (a) performed sequentially. For example, the method may also include step (c), indicating that step (c) can be added to the method in any order, for example, the method may include steps (a), (b) and (c), or steps (a), (c) and (b), or steps (c), (a) and (b), etc.

[0043] In this application, unless otherwise specified, A (such as B) means that B is a non-limiting example of A, and it can be understood that A is not limited to B.

[0044] In this application, "optionally", "optional", and "optional" mean optional, that is, any one of the two parallel schemes of "yes" or "no". If there are multiple "options" in a technical solution, unless otherwise specified and there is no contradiction or mutual restriction, each "option" is independent.

[0045] As mentioned above, the consistency of test results obtained by different laboratories or different test methods cannot be guaranteed, nor can the accuracy of the test be determined. The control of the "hardenability" of steel is a core technical indicator, so it is necessary to have a standard sample and its preparation and testing methods that can evaluate or test the consistency of the hardenability of steel by different methods. This can save the step of retesting each steel.

[0046] In a first aspect of the present application, a method for preparing a standard sample for hardenability consistency detection is provided, comprising the following steps:

[0047] S10, smelting the 20CrNiMo alloy by non-vacuum induction heating and electroslag remelting, and then normalizing it, and processing it into a cylindrical standard sample;

[0048] Among them, 20CrNiMo alloy includes the following elements by mass percentage: 0.22%~0.23% C, 0.30%~0.35% Si, 0.75%~0.85% Mn, 0~0.02% P, 0~0.025% S, 0.50%~0.60% Cr, 0.50%~0.60% Ni, and 0.15%~0.25% Mo.

[0049] The 20CrNiMo alloy with the above specific composition is used as the raw material of the standard sample, and it is smelted by non-vacuum induction heating and electroslag remelting to improve the component purity and organizational consistency of the 20CrNiMo alloy, and then normalized and processed to obtain a standard sample with higher component purity and organizational consistency. The obtained standard sample is used as the standard sample for hardenability consistency detection, which can improve the accuracy of the hardenability consistency detection result.

[0050] In some embodiments, the temperature of the normalizing treatment is 900°C to 920°C, and the time is 80 minutes to 100 minutes. As an example, the temperature of the normalizing treatment may be 900°C, 910°C, 920°C, or within the range consisting of any two of the above point values ​​as end values, and similarly below. As an example, the time of the normalizing treatment may be 80 minutes, 90 minutes, 100 minutes, or within the range consisting of any two of the above point values ​​as end values. Further, the temperature of the normalizing treatment is 910°C ± 10°C, and the time is 90 minutes. As an example, the temperature of the normalizing treatment is 910°C, and the time is 90 minutes.

[0051] In some embodiments, the 20CrNiMo alloy is a rod with a diameter of 35 mm. Controlling its diameter can improve the density of the 20CrNiMo alloy structure, reduce the segregation of the structure, and improve the accuracy of the hardenability consistency test result.

[0052] Please refer to FIG. 1 . In some embodiments, the cylindrical standard sample 10 includes a larger diameter end 11 and a smaller diameter end 12 connected to each other. The length of the larger diameter end 11 is shorter than the length of the smaller diameter end 12 .

[0053] In some embodiments, the diameter of the larger diameter end 11 is 30 mm to 32 mm. In some embodiments, the diameter of the smaller diameter end 12 is 25 mm ± 0.3 mm. In some embodiments, the length of the larger diameter end 11 is 3 mm. In some embodiments, the length of the smaller diameter end 12 is 100 mm ± 0.3 mm.

[0054] In a second aspect of the present application, a standard sample for hardenability consistency testing is provided, which is prepared by any of the preparation methods described above.

[0055] The standard sample prepared by the above preparation method has high purity and structural consistency. The prepared standard sample is used as a standard sample for hardenability consistency detection, which can improve the accuracy of the hardenability consistency detection result.

[0056] In a third aspect of the present application, a method for detecting hardenability consistency is provided, comprising the following steps S21 to S23:

[0057] S21. Use a first method to perform a hardenability test on a first standard sample using an end quenching method to obtain a first hardness value of the first standard sample at a first position.

[0058] S22. Use the second method to perform hardenability test on the second standard sample using the end quenching method to obtain a second hardness value of the second standard sample at the first position; the first standard sample and the second standard sample are both the standard samples as described above and have the same size and shape.

[0059] S23. Determine whether the difference between the first hardness value and the second hardness value is within a preset range, and obtain consistency test results of the first method and the second method for the hardenability of the steel according to the determination result.

[0060] In step S23, if the difference between the first hardness value and the second hardness value is within a preset range, the first method and the second method are consistent in the hardenability test results of the steel; if the difference between the first hardness value and the second hardness value is not within the preset range, the first method and the second method are inconsistent in the hardenability test results of the steel.

[0061] It is understandable that both the first method and the second method above use the end quenching method to perform hardenability testing, but the testing parameters and process operations may be different, for example, different processes between different laboratories may lead to different operating details.

[0062] The above-mentioned hardenability consistency detection method of the present application eliminates the influence of the sample processing technology by unifying the standard samples, and then the consistency of the hardenability detection results between different methods can be judged according to the above-mentioned judgment results, and the detection method can improve the accuracy of the hardenability consistency detection results.

[0063] In some embodiments, the step S21 of performing hardenability testing on the first standard sample by using the end quenching method includes the following steps S211-S212:

[0064] S211, heat the standard sample at a temperature of 880±5°C for 65 minutes. Specifically, the heat treatment is performed in a box furnace.

[0065] S212, subjecting the standard sample after the heat treatment in step S211 to an end quenching test, wherein the water spraying time of the end quenching test is 10 minutes and the water temperature is controlled at 20±5°C.

[0066] Further, the time interval between the standard sample being taken out from the heating treatment state in step S211 and the start of the end quenching test is controlled to be no more than 5 seconds. Further, the end quenching test is carried out in an end quenching device. That is, the time interval between the standard sample being taken out from the box furnace and the end quenching test being carried out in the end quenching device is no more than 5 seconds.

[0067] In this way, the first hardness value obtained by the end quenching method of the first method using a specific process is used as the standard result, and compared with the second hardness value of the second method. Based on the comparison of the two, the accuracy of the test result of the second method can be judged more conveniently and accurately. If the difference between the two is within the preset range, the test result of the second method is considered to be consistent with the test structure of the first method, that is, the test result is accurate. Otherwise, it is inaccurate.

[0068] Furthermore, when the end quenching method is used for hardenability testing, the end with a smaller diameter of the standard sample is used as the quenching end, and the end face of the end with a smaller diameter of the corresponding standard sample is the quenching end face.

[0069] Please refer to Figure 2. The end quenching equipment includes a sample positioning and centering device 20, a water supply pipe 31, a water spray pipe 32, a fast switch valve 33 and a disc 34. The water supply pipe 31 is connected to the water spray pipe 32. The water spray pipe 32 is located below the sample positioning and centering device 20. The fast switch valve 33 is arranged on the water supply pipe 31 to control the closing of the water spray. The standard sample 10 is installed on the sample positioning and centering device 20, and the end with a smaller diameter is arranged downward. The disc 34 is located between the sample positioning and centering device 20 and the water spray pipe 32. It can be understood that the disc 34 will open the avoidance position when the hardenability test is carried out, and it will not be located between the sample positioning and centering device 20 and the water spray pipe 32.

[0070] Furthermore, the standard sample 10 is fixed on the sample positioning and centering device 20 through the end with a larger diameter.

[0071] Further, after installation, there is a gap between the lower end of the standard sample 10 and the water spraying end of the water spraying pipe 32. The disc 34 is located between the gap between the standard sample 10 and the water spraying pipe 32.

[0072] Further, the distance between the lower end of the standard sample 10 and the water spraying end of the water spraying pipe 32 is 12.5 mm±0.5 mm.

[0073] Furthermore, the inner diameter of the water spray pipe 32 is 12.5 mm±0.5 mm.

[0074] Further, referring to FIG. 3 , the free height of the water jet of the water spray pipe 32 is controlled to be 60 mm±10 mm.

[0075] In some embodiments, in step S21, the first standard sample or the second standard sample is subjected to a hardenability test using an end quenching method. In steps S21 and S22, the first standard sample or the second standard sample is subjected to a hardenability test using an end quenching method to test the first hardness value or the second hardness value, and the sampling position is a side wall at the smaller diameter end with a depth of 0.4 mm to 0.5 mm, as shown in FIG. 4 .

[0076] In some of the embodiments, the same position refers to a position where the distance between the side wall of the smaller diameter end of the standard sample and the quenched end surface is the same.

[0077] Furthermore, hardness value tests can be performed on multiple positions of the standard sample at a distance of 1.5 mm, 3 mm, 5 mm, 7 mm, 9 mm, 11 mm, 13 mm, 15 mm, 20 mm, 25 mm, and 30 mm between the side wall of the smaller diameter end and the quenched end face, as shown in FIG. 5 .

[0078] In some embodiments, the first hardness value and the second hardness value are both Rockwell hardness, and the preset range is within ±1HRC.

[0079] Furthermore, if the difference between the first hardness value and the second hardness value at one or more positions at which the distances between the side wall of the smaller diameter end of the standard sample and the quenching end face are different is within the above-mentioned preset range; further, if the difference between the first hardness value and the second hardness value at multiple positions at which the distances between the side wall of the smaller diameter end of the standard sample and the quenching end face are all within the above-mentioned preset range, it means that the first method and the second method have better consistency in the hardenability test results of the steel.

[0080] Specifically, the first position includes multiple positions where the distance between the side wall of the smaller diameter end of the standard sample and the quenching end face is 1.5mm, 3mm, 5mm, 7mm, 9mm, 11mm, 13mm, 15mm, 20mm, 25mm, and 30mm. The first hardness values ​​of the first standard sample at multiple positions are compared with the second hardness values ​​of the second standard sample at the multiple positions one by one, and it is determined whether the difference between the first hardness value and the second hardness value at multiple positions is within the preset range. According to the judgment result, the first method and the second method are obtained for the consistency test results of the hardenability of the steel. If the difference between the first hardness value and the second hardness value at the multiple positions is within the preset range, the first method and the second method are consistent in the hardenability test results of the steel (that is, the consistency test results of the hardenability are accurate); otherwise, they are inconsistent (that is, the consistency test results of the hardenability are inaccurate). Further, the first hardness value and the second hardness value are both Rockwell hardness, and the preset range is within ±1HRC.

[0081] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0082] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims, and the description and drawings can be used to interpret the content of the claims.

Claims

1. A method for preparing a standard sample for hardenability consistency detection, characterized in that: The steps include: The 20CrNiMo alloy was smelted by non-vacuum induction heating and electroslag remelting, and then normalized and processed to obtain a cylindrical standard sample. Among them, 20CrNiMo alloy includes the following elements by mass percentage: 0.22%~0.23% C, 0.30%~0.35% Si, 0.75%~0.85% Mn, 0~0.02% P, 0~0.025% S, 0.50%~0.60% Cr, 0.50%~0.60% Ni, and 0.15%~0.25% Mo.

2. The preparation method according to claim 1, characterized in that The normalizing treatment is performed at a temperature of 900° C. to 920° C. and for a time of 80 minutes to 100 minutes.

3. The preparation method according to claim 1, characterized in that: The 20CrNiMo alloy is a rod with a diameter of 35 mm.

4. The preparation method according to any one of claims 1 to 3, characterized in that: The cylindrical standard sample comprises an end with a larger diameter and an end with a smaller diameter connected to each other, and the length of the end with the larger diameter is shorter than the length of the end with the smaller diameter.

5. The preparation method according to claim 4, characterized in that: The diameter of the larger diameter end is 30 mm to 32 mm, the diameter of the smaller diameter end is 25 mm ± 0.3 mm, the length of the larger diameter end is 3 mm, and the length of the smaller diameter end is 100 mm ± 0.3 mm.

6. A standard sample for hardenability consistency detection, characterized in that: The method is prepared according to any one of claims 1 to 5.

7. A method for detecting hardenability consistency, characterized in that: The steps include: Using a first method to perform a hardenability test on a first standard sample using an end quenching method to obtain a first hardness value of the first standard sample at a first position; Using the second method to perform hardenability testing on the second standard sample using the end quenching method, and obtaining a second hardness value of the second standard sample at the first position; the first standard sample and the second standard sample are both the standard samples as claimed in claim 6, and have the same size and shape; Determine whether the difference between the first hardness value and the second hardness value is within the preset range, and obtain the consistency test results of the first method and the second method for the hardenability of the steel according to the determination result; If the difference between the first hardness value and the second hardness value is within a preset range, the first method and the second method are consistent in the hardenability test results of the steel; otherwise, they are inconsistent.

8. The method for detecting hardenability consistency according to claim 7, wherein: The cylindrical standard sample comprises an end with a larger diameter and an end with a smaller diameter connected to each other, the length of the end with a larger diameter is shorter than the length of the end with a smaller diameter, the end face of the end with a smaller diameter of the standard sample is a quenched end face, and the first position comprises a plurality of positions where the distance between the side wall of the end with a smaller diameter of the standard sample and the quenched end face is 1.5 mm, 3 mm, 5 mm, 7 mm, 9 mm, 11 mm, 13 mm, 15 mm, 20 mm, 25 mm, and 30 mm; Comparing the first hardness values ​​of the first standard sample at the plurality of positions with the second hardness values ​​of the second standard sample at the plurality of positions in a one-to-one correspondence manner, determining whether the differences between the first hardness values ​​and the second hardness values ​​at the plurality of positions are all within a preset range, and obtaining the consistency test results of the first method and the second method for the hardenability of the steel according to the determination result; If the differences between the first hardness values ​​and the second hardness values ​​at the multiple positions are all within the preset range, the first method and the second method are consistent in the hardenability test results of the steel; otherwise, they are not consistent.

9. The method for detecting hardenability consistency according to claim 7, wherein: The first hardness value and the second hardness value are both Rockwell hardness, and the preset range is within ±1HRC.

10. The method for detecting hardenability consistency according to any one of claims 7 to 9, characterized in that: The first method is used to perform hardenability testing on the first standard sample by the end quenching method, which includes the following steps: The first standard sample is subjected to a heating treatment at a temperature of 880±5° C. for 65 minutes; The first standard sample after the heating treatment is subjected to an end quenching test, wherein the water spraying time of the end quenching test is 10 minutes and the water temperature is controlled at 20±5°C; Wherein, the time interval between taking out the first standard sample from the state of the heating treatment and starting the end quenching test is controlled to be no more than 5 seconds.

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