Manufacturing method for areas with different hardness on surface of steel plate

Abstract

The invention discloses a method for manufacturing areas with different hardness on the surface of a steel plate, and relates to the technical field of steel hardness detection.The method comprises the steps that two steel samples with the same size are obtained; uniformly arranging a plurality of hard positioning points on the surface of each sample; and welding rods with different yield strengths are adopted for welding the hard positioning points one by one. According to the method, a plurality of hard positioning points are formed on the surface of the intercepted steel sample, welding rods with different yield strengths are welded at the corresponding hard positioning points, and then a plurality of areas with different hardness values can be formed on the surface of the steel sample after the sample is subjected to heat treatment; therefore, solid data support and reference basis are provided for an intelligent system for detecting the hard lumps on the surface of the steel plate.

Description

Technical Field

[0001] The invention relates to the technical field of steel hardness detection, and in particular to a method for manufacturing areas with different hardness on the surface of a steel plate. Background Art

[0002] With the rapid development of industry, the requirements for material performance are getting higher and higher. Especially in the fields of petroleum, chemical industry, mining, etc. In these fields, the surface hardness of steel plates has become one of the key indicators to measure their wear resistance and corrosion resistance. Although the traditional flame gun local heating method can improve the surface hardness of steel plates to a certain extent, it has many limitations, such as uneven heating and inaccurate hardness control, which makes it difficult to meet the needs of high-precision and high-consistency industrial testing.

[0003] Customers are increasingly demanding the full surface hardness of steel plates. In order to meet this market demand, it is particularly urgent to develop a production technology that can accurately control the hardness value of a certain area on the surface of a steel plate. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method for manufacturing areas with different hardness on the surface of a steel plate.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows: A method for manufacturing areas with different hardness on the surface of a steel plate, comprising: Obtain two steel specimens of the same size; Several hard positioning points are evenly opened on the surface of each specimen; The hard positioning points are welded one by one using welding rods with different yield strengths.

[0006] As a preferred solution of the method for making different hardness areas on the surface of the steel plate of the present invention, wherein: a plurality of the hard positioning points on the sample are arranged in a matrix; The diameters of the hard positioning points in any row are equal, and the diameters of the hard positioning points in different rows increase in sequence.

[0007] As a preferred solution of the method for manufacturing areas with different hardness on the surface of the steel plate of the present invention, the number of the welding rods is equal to the sum of the number of rows of the hard positioning points in the two specimens.

[0008] As a preferred solution of the method for manufacturing different hardness areas on the surface of the steel plate of the present invention, the step of welding the hard positioning points one by one using welding rods with different yield strengths comprises: Select any welding rod to perform welding on any row of hard positioning points in any sample; Use any unused welding rod to weld any unwelded row of hard positioning points in any sample; Repeat the previous step until all welding rods are welded to the hard positioning points.

[0009] As a preferred solution of the method for making different hardness areas on the surface of the steel plate described in the present invention, the number of rows and columns of the several hard positioning points in any sample is three, and in the two samples, the diameter of the hard positioning points in the row with the smallest diameter is 8.7 mm, the diameter of the hard positioning points in the row with the middle diameter is 10 mm, and the diameter of the hard positioning points in the row with the largest diameter is 14 mm.

[0010] As a preferred solution of the method for producing different hardness areas on the surface of the steel plate described in the present invention, the number of the welding rods is six, and the yield strengths of the six welding rods are 500MPa, 600MPa, 700MPa, 800MPa, 900MPa and 1000MPa respectively.

[0011] As a preferred solution of the method for making different hardness areas on the surface of the steel plate of the present invention, the step of obtaining two steel samples of the same size includes: Two steel samples of the same size are cut from the head and tail of the steel respectively.

[0012] As a preferred solution of the method for making areas with different hardness on the surface of the steel plate of the present invention, the length and width of any of the samples are both 120 mm.

[0013] The beneficial effects of the present invention are: The present invention opens a plurality of hard positioning points on the surface of the intercepted steel sample, and uses welding rods with different yield strengths to weld at the corresponding hard positioning points. After heat treatment of the sample, a plurality of areas with different hardness values ​​can be formed on the surface of the steel sample, thereby providing solid data support and reference basis for the intelligent system for surface hard block detection of steel plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0015] Figure 1 A schematic diagram of the process of the method for producing areas with different hardness on the surface of a steel plate provided by the present invention; Figure 2 is a schematic diagram of a steel sample; Figure 3 A schematic diagram of the hardness regions on the surface of a steel sample obtained by the method for producing different hardness regions on the surface of a steel plate provided by the present invention. DETAILED DESCRIPTION

[0016] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific implementation modes and in combination with the accompanying drawings.

[0017] The present application provides a method for manufacturing different hardness areas on the surface of a steel plate. Figure 1 , the method specifically comprises the following steps: Step S101: Obtain two steel samples of the same size.

[0018] Specifically, in this embodiment, the steel material is first obtained, and then a steel sample with a length of 120 mm and a width of 120 mm is cut from the head and tail of the steel material respectively.

[0019] Step S102: evenly opening a number of hard positioning points on the surface of each sample.

[0020] Specifically, the hard positioning points on each sample are arranged in a matrix. Meanwhile, the diameters of the hard positioning points in any row are equal, and the diameters of the hard positioning points in different rows increase in sequence.

[0021] See also Figure 2 In this embodiment, the hard positioning points in each steel sample are arranged in a matrix, and the number of rows and columns of the hard positioning points are both three. In each steel sample, the diameter of the bottom row of hard positioning points is the smallest, the diameter of the top row of hard positioning points is the largest, and the diameter of the middle row of hard positioning points is in the middle. At the same time, in the two steel samples, the diameters of the hard positioning points in the corresponding rows are equal, that is, the diameters of the two bottom rows of hard positioning points are equal, the diameters of the two top rows of hard positioning points are equal, and the diameters of the two middle rows of hard positioning points are equal.

[0022] In this embodiment, in the two samples, the diameter of the smallest row of hard positioning points is 8.7 mm, the diameter of the middle row of hard positioning points is 10 mm, and the diameter of the largest row of hard positioning points is 14 mm. When the hard positioning points are set on the surface of each steel sample, three rows and three columns are evenly arranged at intervals of 30 mm, with a total of nine hard positioning points.

[0023] In this embodiment, the depth of all hard positioning points is 5 mm.

[0024] Step S103: welding the hard positioning points one by one using welding rods with different yield strengths, and performing standard heat treatment on the samples after welding.

[0025] Specifically, welding rods with different yield strengths are used to perform welding processing on each row of hard positioning points one by one. It should be noted that the number of welding rods is equal to the sum of the number of rows of hard positioning points in the two samples. That is, in this embodiment, the number of welding rods is six. Therefore, when welding rods with different yield strengths are used to perform welding processing on each row of hard positioning points one by one, the specific steps are as follows: Step S103a: Select any welding rod to perform welding processing on any row of hard positioning points in any sample; Step S103b: Select any unused welding rod to perform welding processing on any row of unwelded hard positioning points in any sample; Step S103c: Repeat step S103b until all welding rods are welded to the hard positioning points.

[0026] In this embodiment, the yield strengths of the six welding rods are 500 MPa, 600 MPa, 700 MPa, 800 MPa, 900 MPa and 1000 MPa, respectively.

[0027] After all the electrodes are welded to the corresponding rows of hard positioning points, the specimens are subjected to a standard heat treatment process to obtain different hardness values ​​in different areas of the surface, such as Figure 3 As shown, a steel plate surface hardness area with a hardness value between 225HV and 365HV is produced to meet specific industrial application requirements.

[0028] After the heat treatment process is completed, the sample surface is finely polished to ensure the accuracy of the test results. Subsequently, professional hardness testing equipment is used to measure the HV and HRC hardness values ​​at multiple preset test points on the sample. By systematically analyzing these data, the effect of this invention in producing different hardness values ​​can be scientifically evaluated, thereby providing solid data support and reference basis for the intelligent system for surface hard block detection of steel plates.

[0029] From this, it can be seen that the technical solution of the present application is to open multiple hard positioning points on the surface of the intercepted steel sample, and use welding rods with different yield strengths to weld at the corresponding hard positioning points. After that, after heat treatment of the sample, multiple areas with different hardness values ​​can be formed on the surface of the steel sample, thereby providing solid data support and reference basis for the intelligent system for surface hard block detection of steel plates.

[0030] In addition to the above embodiments, the present invention may also have other implementation modes; any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A method for producing areas of different hardness on the surface of a steel plate, characterized in that: include: Obtain two steel specimens of the same size; Several hard positioning points are evenly opened on the surface of each specimen; The hard positioning points are welded one by one using welding rods with different yield strengths.

2. The method for producing areas of different hardness on the surface of a steel plate according to claim 1, characterized in that: The plurality of hard positioning points on the sample are arranged in a matrix; The diameters of the hard positioning points in any row are equal, and the diameters of the hard positioning points in different rows increase successively.

3. The method for producing areas of different hardness on the surface of a steel plate according to claim 2, characterized in that: The number of the welding rods is equal to the sum of the number of rows of the hard positioning points in the two specimens.

4. The method for producing areas of different hardness on the surface of a steel plate according to claim 3, characterized in that: The welding process of welding the hard positioning points one by one using welding rods with different yield strengths includes: Select any welding rod to perform welding on any row of hard positioning points in any sample; Use any unused welding rod to weld any unwelded row of hard positioning points in any sample; Repeat the previous step until all welding rods are welded to the hard positioning points.

5. The method for producing areas of different hardness on the surface of a steel plate according to claim 1, characterized in that: The number of rows and columns of the hard positioning points in any sample is three. In the two samples, the diameter of the hard positioning points in the row with the smallest diameter is 8.7 mm, the diameter of the hard positioning points in the row with the middle diameter is 10 mm, and the diameter of the hard positioning points in the row with the largest diameter is 14 mm.

6. The method for producing areas of different hardness on the surface of a steel plate according to claim 5, characterized in that: The number of the welding rods is six, and the yield strengths of the six welding rods are 500MPa, 600MPa, 700MPa, 800MPa, 900MPa and 1000MPa respectively.

7. The method for producing areas of different hardness on the surface of a steel plate according to claim 1, characterized in that: The method of obtaining two steel samples of the same size comprises: Two steel samples of the same size are cut from the head and tail of the steel respectively.

8. The method for producing areas of different hardness on the surface of a steel plate according to claim 7, characterized in that: The length and width of any of the test specimens are both 120 mm.

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