A repair material, a repair coating, and a repair method for a sealed runway wear-resistant steel belt

Abstract

The application discloses a kind of repair material of sealing runway wear-resistant steel belt, repair coating, repair method, repair material is cobalt-based alloy powder, cobalt-based alloy powder includes the following mass percentage of component: C:0.8-1.2%, Cr:24.0-30.0%, W:1.0-3.0%, Ni:4-6%, Co:52-61%.The repair coating is prepared using the repair material.The repair method includes the following steps: the damaged annular sealing runway wear-resistant steel belt is made into a flat sheet;Sealing runway wear-resistant steel belt surface is washed;Repair material is baked;After baking, repair material is repaired in the damaged area of sealing runway wear-resistant steel belt using laser cladding;The sealing runway wear-resistant steel belt after repair is finished;The sealing runway wear-resistant steel belt after finishing is surface rolling treatment;The sealing runway wear-resistant steel belt after rolling treatment is welded into a ring, and the repair surface is used as the inner wall.The technical scheme provided by the application efficiently repairs the sealing runway wear-resistant steel belt, with stable quality and excellent performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wear-resistant coating, in particular to a repair material, a repair coating and a repair method for a sealing track wear-resistant steel belt. BACKGROUND

[0002] As a key component of the main bearing of the tunneling machine, the sealing track is lubricated by injecting grease during normal use. However, even with such lubrication, grooves will still be worn on the sealing track. When the sealing track is worn to a certain extent, water and sludge will enter the main bearing, causing the main bearing to wear out faster and fail prematurely.

[0003] To increase the wear resistance of the sealing track, quenched carbon steel is often used as the sealing track, which requires a surface hardness of 55-60HRC and uniform hardness. The sealing track of the main bearing of the tunneling machine has a large diameter, and it is difficult to meet the requirements with general quenching processes. Therefore, cobalt-based alloy with good wear resistance is selected to make the sealing track wear-resistant steel belt. However, cobalt resources are very scarce, with a content of about 20-30 ppm in the earth's crust, and the annual output is less than one-sixth of titanium, much less than iron, magnesium and other metals. Therefore, the cost of the sealing track wear-resistant steel belt made of cobalt alloy is also very high. If the sealing track wear-resistant steel belt made of cobalt alloy is discarded directly after damage, it not only causes great waste of resources, but also causes great economic loss.

[0004] With the development of science and technology in recent years, research on sealing track repair has gradually emerged. For example, a Chinese invention patent application with the application publication date of December 10, 2021 and the application publication number of CN 113774375 A discloses a remanufacturing coating for the sealing track of the main bearing of a shield tunneling machine and a preparation method thereof, which belongs to the technical field of repair of the sealing track of the main bearing of the shield tunneling machine. The high-entropy alloy powder includes the following atomic percentages: 8% Al, 19.4% Co, 19.4% Cr, 19.5% Fe, 19.5% Ni, and 19.5% Cu. The nickel-based alloy powder is used as the base layer of the remanufacturing coating, and the nickel-based alloy is a common laser cladding powder. The technical solution uses self-made high-entropy alloy powder and an optimized cladding process to prepare the remanufacturing coating. However, the repair method has complex material composition, complex repair process, low repair efficiency, and insufficient performance.

[0005] Therefore, it is necessary to design a repair material with simple composition, simple operation, high repair efficiency and excellent performance, as well as a repair coating and a repair method. SUMMARY

[0006] In view of the deficiencies in the above background art, the present application provides a repair material, a repair coating and a repair method for a sealing track wear-resistant steel belt, which solves the technical problems of complex material composition, complex repair process, low repair efficiency and insufficient performance of the existing remanufacturing coating for the sealing track of the main bearing of the shield tunneling machine and the preparation method thereof.

[0007] The technical scheme of the present application is:

[0008] A repair material for a sealed runway wear-resistant steel belt, the repair material is a cobalt-based alloy powder, the cobalt-based alloy powder comprises the following components in mass percentage: C: 0.8-1.2%, Cr: 24.0-30.0%, W: 1.0-3.0%, Ni: 4-6%, Co: 52-61%.

[0009] Further, the average particle size of the cobalt-based alloy powder is 10-30 μm.

[0010] Further, the mass percentage of C is 0.8%, the mass percentage of Cr is 24.0%, the mass percentage of W is 1.0%, the mass percentage of Ni is 6.0%, and the mass percentage of Co is 61%.

[0011] Alternatively, the mass percentage of C is 1.0%, the mass percentage of Cr is 26.0%, the mass percentage of W is 2.0%, the mass percentage of Ni is 5.0%, and the mass percentage of Co is 59%.

[0012] Alternatively, the mass percentage of C is 1.2%, the mass percentage of Cr is 30.0%, the mass percentage of W is 3.0%, the mass percentage of Ni is 4.0%, and the mass percentage of Co is 52%.

[0013] A repair coating for a sealed runway wear-resistant steel belt is prepared using the repair material described above.

[0014] Further, the preparation method is: first, baking the repair material in an oven, and then applying the repair material to the damaged area of the sealed runway wear-resistant steel belt by laser cladding.

[0015] Further, after the repair material is applied to the damaged area of the sealed runway wear-resistant steel belt by laser cladding, the surface of the sealed runway wear-resistant steel belt is subjected to a rolling treatment.

[0016] A repair method for a sealed runway wear-resistant steel belt comprises the following steps:

[0017] S1: forming a damaged annular sealed runway wear-resistant steel belt into a flat sheet;

[0018] S2: cleaning the surface of the sealed runway wear-resistant steel belt;

[0019] S3: baking the repair material in an oven;

[0020] S4: adopting laser cladding to repair the damaged area of the sealing runway wear-resistant steel belt in step S3 after baking the repair material;

[0021] S5: finishing the repaired sealing runway wear-resistant steel belt;

[0022] S6: surface rolling treatment is performed on the finished sealing runway wear-resistant steel belt;

[0023] S7: the sealing runway wear-resistant steel belt after rolling treatment is welded into a ring, and the repaired surface is used as the inner wall of the sealing runway wear-resistant steel belt.

[0024] Further, in S1, the damaged annular sealing runway wear-resistant steel belt is cut once and is subjected to rolling treatment, so that the sealing runway wear-resistant steel belt becomes a flat sheet; in S2, the sealing runway wear-resistant steel belt is cleaned with acetone to remove impurities on the surface; in S3, the repair material is baked in a 120 DEG C oven for 30 min; in S4, the damaged area is repaired by laser cladding; in S5, the repaired wear-resistant steel belt is finished; and in S6, the finished wear-resistant steel belt is subjected to surface rolling treatment.

[0025] Further, in S4, the process parameters for repair are as follows: the laser power is 1500W-2500W, the scanning speed is 100mm / s-200mm / s, and the overlap rate is 50%-70%.

[0026] Compared with the prior art, the technical scheme of the present application has the following technical effects:

[0027] The present application provides a repair material, a repair coating and a repair method for repairing a sealing runway wear-resistant steel belt, which are efficient, stable in quality and excellent in performance.

[0028] In the technical scheme of the present application, the main drive sealing runway is repaired by laser cladding using cobalt-based alloy powder, the composition of the cobalt-based alloy powder is close to that of the sealing runway, the coating and the substrate are better in metallurgical bonding effect, the cobalt-based alloy is subjected to surface rolling treatment and changes in phase under the action of external force, and the performance becomes more excellent, and the repaired surface is used as the inner contact surface of the sealing runway, so that the service life is longer.

[0029] Therefore, according to the technical scheme of the present application, efficient and high-quality repair of the large-size sealing runway wear-resistant steel belt of the heading machine main drive and the like can be realized. As a result, high-quality surface repair can be quickly obtained by using relatively simple materials and processes; the repaired cladding layer not only has high hardness, but also has good plasticity and toughness; the repaired area is applied to an area with a good working environment, so that the overall workpiece can have good use effect. DETAILED DESCRIPTION

[0030] The technical scheme of the present application will be described below in detail with reference to specific examples, comparative examples and test examples. Obviously, the described examples are only some of the embodiments of the present application, but not all the embodiments. Based on the core idea of the present application and the following examples, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0031] Example 1

[0032] A repair material for a sealing runway wear-resistant steel belt, the repair material is a cobalt-based alloy powder, the cobalt-based alloy powder comprises the following components in mass percentage: C: 0.8-1.2%, Cr: 24.0-30.0%, W: 1.0-3.0%, Ni: 4-6%, Co: 52-61%, and the balance is Fe, Si, Mn and Mo.

[0033] Example 2

[0034] A repair material for a sealing runway wear-resistant steel belt, the repair material is a cobalt-based alloy powder, the cobalt-based alloy powder comprises the following components in mass percentage: C: 0.8-1.2%, Cr: 24.0-30.0%, W: 1.0-3.0%, Ni: 4-6%, Co: 52-61%, and the balance is Fe, Si, Mn and Mo.

[0035] Further, the average particle size of the cobalt-based alloy powder is 10-30 μm.

[0036] Example 3

[0037] A repair material for a sealing runway wear-resistant steel belt, on the basis of example 1 or 2, the mass percentage of C is 0.8%, the mass percentage of Cr is 24.0%, the mass percentage of W is 1.0%, the mass percentage of Ni is 6.0%, the mass percentage of Co is 61%, and the balance is Fe, Si, Mn and Mo.

[0038] Example 4

[0039] A repair material of a sealed runway wear-resistant steel belt, based on the embodiments 1 or 2, the mass percentage of C is 1.0%, the mass percentage of Cr is 26.0%, the mass percentage of W is 2.0%, the mass percentage of Ni is 5.0%, the mass percentage of Co is 59%, and the balance is Fe, Si, Mn, Mo.

[0040] Embodiment 5

[0041] A repair material of a sealed runway wear-resistant steel belt, based on the embodiments 1 or 2, the mass percentage of C is 1.2%, the mass percentage of Cr is 30.0%, the mass percentage of W is 3.0%, the mass percentage of Ni is 4.0%, the mass percentage of Co is 52%, and the balance is Fe, Si, Mn, Mo.

[0042] Embodiment 6

[0043] A repair coating of a sealed runway wear-resistant steel belt, prepared by using the repair material of any one of the embodiments 1-5.

[0044] Further, the preparation method is that the repair material is first baked in an oven, and then is attached to the damaged area of the sealed runway wear-resistant steel belt by laser cladding.

[0045] Further, after the repair material is attached to the damaged area of the sealed runway wear-resistant steel belt by laser cladding, the surface of the sealed runway wear-resistant steel belt is subjected to rolling treatment.

[0046] Embodiment 7

[0047] A repair method of a sealed runway wear-resistant steel belt, comprising the following steps:

[0048] S1: making the damaged annular sealed runway wear-resistant steel belt into a flat sheet;

[0049] S2: cleaning the surface of the sealed runway wear-resistant steel belt;

[0050] S3: baking the repair material in an oven;

[0051] S4: repairing the repair material on the damaged area of the sealed runway wear-resistant steel belt by laser cladding after baking in step S3;

[0052] S5: finishing the repaired sealed runway wear-resistant steel belt;

[0053] S6: subjecting the finished sealed runway wear-resistant steel belt to surface rolling treatment;

[0054] S7: welding the rolling processed sealing runway wear-resistant steel belt into a ring, and taking the repaired surface as the inner wall of the sealing runway wear-resistant steel belt.

[0055] Embodiment 8

[0056] A repairing method of a sealing runway wear-resistant steel belt, comprising the following steps:

[0057] S1: making the damaged annular sealing runway wear-resistant steel belt into a flat sheet;

[0058] S2: cleaning the surface of the sealing runway wear-resistant steel belt;

[0059] S3: baking the repairing material in an oven;

[0060] S4: repairing the damaged area of the sealing runway wear-resistant steel belt by laser cladding after baking the repairing material in step S3;

[0061] S5: finishing the repaired sealing runway wear-resistant steel belt;

[0062] S6: surface rolling processing the finished sealing runway wear-resistant steel belt;

[0063] S7: welding the rolling processed sealing runway wear-resistant steel belt into a ring, and taking the repaired surface as the inner wall of the sealing runway wear-resistant steel belt.

[0064] Further, in S1, the damaged annular sealing runway wear-resistant steel belt is cut once and rolled to make the sealing runway wear-resistant steel belt into a flat sheet.

[0065] Further, in S2, the surface of the sealing runway wear-resistant steel belt is cleaned with acetone to remove impurities on the surface.

[0066] Further, in S3, the repairing material is baked in a 120 DEG C oven for 30 min.

[0067] Further, in S4, the damaged area is repaired by laser cladding.

[0068] Further, in S5, the repaired wear-resistant steel belt is finished; and in S6, the finished wear-resistant steel belt is surface rolling processed.

[0069] Embodiment 9

[0070] A repairing method of a sealing runway wear-resistant steel belt, comprising the following steps:

[0071] S1: making the damaged annular sealing runway wear-resistant steel belt into a flat sheet;

[0072] S2: cleaning the surface of the sealed runway wear-resistant steel belt;

[0073] S3: placing the repair material in an oven for baking;

[0074] S4: repairing the damaged area of the sealed runway wear-resistant steel belt with the repair material baked in step S3 by laser cladding;

[0075] S5: finishing the repaired sealed runway wear-resistant steel belt;

[0076] S6: surface rolling treatment of the finished sealed runway wear-resistant steel belt;

[0077] S7: welding the sealed runway wear-resistant steel belt after rolling treatment into a ring, with the repaired surface as the inner wall of the sealed runway wear-resistant steel belt.

[0078] Further, in S1, the damaged annular sealed runway wear-resistant steel belt is cut once and subjected to rolling treatment, so that the sealed runway wear-resistant steel belt becomes a flat sheet.

[0079] Further, in S2, the surface of the sealed runway wear-resistant steel belt is cleaned with acetone to remove impurities on the surface.

[0080] Further, in S3, the repair material is placed in a 120°C oven for baking for 30 minutes.

[0081] Further, in S4, the process parameters for repair are as follows: laser power is 1500W-2500W, scanning speed is 100mm / s-200mm / s, and overlap rate is 50%-70%.

[0082] Further, in S5, the repaired wear-resistant steel belt is finished; and in S6, the finished wear-resistant steel belt is subjected to surface rolling treatment.

[0083] Example 10

[0084] A repair coating for a sealed runway wear-resistant steel belt, wherein the repair coating is prepared from a cobalt-based alloy powder;

[0085] The cobalt-based alloy powder comprises the following components by mass percentage: C: 0.8%, Cr: 24.0%, W: 1.0%, Ni: 6%, Co: 61%, and the balance of Fe, Si, Mn, and Mo;

[0086] The average particle size of the cobalt-based alloy powder is 10μm;

[0087] The preparation method of the repair coating comprises the following steps:

[0088] S1: cutting the damaged ring-shaped sealing runway wear-resistant steel strip once and carrying out roll-pressing treatment to make it become a flat sheet;

[0089] S2: cleaning the surface of the sealing runway wear-resistant steel strip with acetone to remove oil stains, dust and other impurities;

[0090] S3: placing the cobalt-based alloy powder in a 120℃ oven for baking for 30min;

[0091] S4: repairing the damaged area by adopting laser cladding;

[0092] S5: finishing the repaired wear-resistant steel strip;

[0093] S6: carrying out surface roll-pressing treatment on the finished wear-resistant steel strip;

[0094] S7: welding the roll-pressing treated wear-resistant steel strip into a ring, and taking the repaired surface as the inner wall of the wear-resistant runway.

[0095] The process parameters for repairing in step S4 are: laser power 1500W, scanning speed 100mm / s, and lap rate 50%;

[0096] The surface hardness of the repaired sealing runway wear-resistant steel strip is 400-600HV, and the elongation after fracture is >5%.

[0097] Embodiment 11

[0098] A repair coating for a sealing runway wear-resistant steel strip, wherein the repair coating is prepared from a cobalt-based alloy powder;

[0099] The cobalt-based alloy powder comprises the following components by mass percentage: C: 1.0%, Cr: 26.0%, W: 2.0%, Ni: 5%, Co: 59%, and the balance is Fe, Si, Mn and Mo;

[0100] The average particle size of the cobalt-based alloy powder is 20μm.

[0101] The preparation method of the repair coating, characterized by comprising the following steps:

[0102] S1: cutting the damaged ring-shaped sealing runway wear-resistant steel strip once and carrying out roll-pressing treatment to make it become a flat sheet;

[0103] S2: cleaning the surface of the sealing runway wear-resistant steel strip with acetone to remove oil stains, dust and other impurities;

[0104] S3: placing the cobalt-based alloy powder in an oven for baking treatment;

[0105] S4: repairing the damaged area by adopting laser cladding;

[0106] S5: Finishing the repaired wear-resistant steel strip;

[0107] S6: Surface rolling treatment of the finished wear-resistant steel strip;

[0108] S7: Welding the wear-resistant steel strip after rolling treatment into a ring, and repairing the surface as the inner wall of the wear-resistant runway.

[0109] The process parameters for repairing in step S4 are: laser power 2000W, scanning speed 150mm / s, and lap rate 60%.

[0110] The surface hardness of the repaired wear-resistant steel strip of the sealed runway is 420-620HV, and the elongation after fracture is >5%.

[0111] Example 12

[0112] A repair coating for a sealed runway wear-resistant steel strip, wherein the repair coating is prepared from a cobalt-based alloy powder;

[0113] The cobalt-based powder comprises the following components by mass percentage: C: 1.2%, Cr: 30.0%, W: 3.0%, Ni: 4%, Co: 52%, and the balance of Fe, Si, Mn, and Mo;

[0114] The average particle size of the cobalt-based alloy powder is 30μm;

[0115] The repair coating preparation method comprises the following steps:

[0116] S1: Cutting the damaged annular sealed runway wear-resistant steel strip once and performing rolling treatment to make it into a flat sheet;

[0117] S2: Cleaning the surface of the sealed runway wear-resistant steel strip with acetone to remove oil stains, dust and other impurities;

[0118] S3: Placing the cobalt-based alloy powder in a 120℃ oven for 30min;

[0119] S4: Repairing the damaged area by laser cladding;

[0120] S5: Finishing the repaired wear-resistant steel strip;

[0121] S6: Surface rolling treatment of the finished wear-resistant steel strip;

[0122] S7: Welding the wear-resistant steel strip after rolling treatment into a ring, and repairing the surface as the inner wall of the wear-resistant runway.

[0123] The process parameters for the step S4 repair are: laser power 2500W, scanning speed 200mm / s, and overlap rate 70%;

[0124] The surface hardness of the repaired sealing runway wear-resistant steel strip is 450-650HV, and the elongation after fracture is >4%.

[0125] Comparative Example 1

[0126] A repair coating for a sealing runway wear-resistant steel strip, wherein the repair coating is prepared from a cobalt-based alloy powder;

[0127] The cobalt-based powder comprises the following components by mass percentage: C: 1.5%, Cr: 31.0%, W: 2.0%, Ni: 3.0%, Co: 51.0%, and the balance of Fe, Si, Mn, and Mo;

[0128] The average particle size of the cobalt-based alloy powder is 30μm;

[0129] The repair coating preparation method comprises the following steps:

[0130] S1: cutting the damaged annular sealing runway wear-resistant steel strip once and performing roll pressing treatment to make it into a flat sheet;

[0131] S2: cleaning the surface of the sealing runway wear-resistant steel strip with acetone to remove oil stains, dust, and other impurities;

[0132] S3: placing the cobalt-based alloy powder in a 120℃ oven for 30min;

[0133] S4: repairing the damaged area by laser cladding;

[0134] S5: performing finishing processing on the repaired wear-resistant steel strip;

[0135] S6: performing surface roll pressing treatment on the finished wear-resistant steel strip;

[0136] S7: welding the roll-pressed wear-resistant steel strip into a ring, with the repaired surface as the inner wall of the wear-resistant runway;

[0137] The process parameters for the step S4 repair are: laser power 2500W, scanning speed 200mm / s, and overlap rate 70%;

[0138] The surface hardness of the repaired sealing runway wear-resistant steel strip is 500-580HV, and the elongation after fracture is <4%.

[0139] Comparative Example 2

[0140] A repair coating for a sealing runway wear-resistant steel strip, wherein the repair coating is prepared from a cobalt-based alloy powder;

[0141] The cobalt-based powder comprises the following components by mass percentage: C: 2.0%, Cr: 32.0%, W: 4.0%, Ni: 3%, Co: 51%, and the balance of Fe, Si, Mn, Mo;

[0142] The average particle size of the cobalt-based alloy powder is 30 μm;

[0143] The repair coating preparation method is characterized in that it comprises the following steps:

[0144] S1: One-time cutting is performed on the damaged annular sealing runway wear-resistant steel strip, and rolling treatment is performed to make it into a flat sheet;

[0145] S2: The surface of the sealing runway wear-resistant steel strip is cleaned with acetone to remove oil stains, dust and other impurities;

[0146] S3: The cobalt-based alloy powder is placed in a 120°C oven for 30 min;

[0147] S4: The damaged area is repaired by laser cladding;

[0148] S5: The repaired wear-resistant steel strip is finished;

[0149] S6: The finished wear-resistant steel strip is subjected to surface rolling treatment;

[0150] S7: The wear-resistant steel strip after rolling treatment is welded into a ring, and the repair surface is used as the inner wall of the wear-resistant runway;

[0151] The process parameters for repairing in step S4 are: laser power 2500 W, scanning speed 200 mm / s, and overlap rate 70%;

[0152] The surface hardness of the repaired sealing runway wear-resistant steel strip is 550-700 HV, and the elongation after fracture is less than 4%.

[0153] Test Example 1

[0154] The alloy powder used in Example 10, Example 11, Example 12, and Comparative Example 1 and Comparative Example 2 is subjected to sealing runway wear-resistant steel strip repair using the same process as described in the above examples, and the performance of the repaired sealing runway wear-resistant steel strip is tested. The measured performance data is shown in Table 1.

[0155] Table 1 Comparison of repair performance of Examples 10, 11, 12 and Comparative Examples 1, 2

[0156]

[0157] The above examples and comparative examples show that when the components and contents of the repairing powder are not suitable, the abrasion loss increases, the abrasion performance deteriorates, the elongation after fracture is low, and the material toughness is poor.

[0158] It should be noted that the core of the innovation of the present application is to give the components and contents of the repairing powder, to reasonably select C, Cr, W, Ni and Co, to optimize each component to a suitable range, and to make each element synergistic through a reasonable processing process, so as to realize high-quality repair of the main driving sealing runway wear-resistant steel belt.

[0159] The above performance tests all use the same test method, i.e., the test method for effect comparison of example 10, example 11, example 12, comparative example 1 and comparative example 2 is provided. The hardness, elongation after fracture and abrasion loss of the sealing runway wear-resistant steel belt repaired are tested. The measurement method of the above parameters is as follows:

[0160] The hardness is measured by HV-1000Z microhardness tester, the loading load is 2.94N, the load holding time is 10s, and 5 points are measured;

[0161] The elongation after fracture is measured by UTM535X-30T universal testing machine, the tensile rate is 0.6mm / min, and 5 samples are measured.

[0162] The abrasion loss is measured by MLGS-225C dry and wet sand rubber wheel type abrasion tester, the load is 175N, the rotation speed is 200rmp, the abrasion time is 150min, 5 samples are measured, and the average value of 5 times is taken.

[0163] The details of the present application are all conventional technical means known to those skilled in the art.

[0164] The above content shows and describes the basic principles, main features and beneficial effects of the present application. The above description is only the preferred embodiment of the present application and does not limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A repair coating for a sealed track wear steel belt, characterized by: The repair material is prepared from a cobalt-based alloy powder, which comprises the following components in mass percentage: C: 0.8-1.2%, Cr: 24.0-30.0%, W: 1.0-3.0%, Ni: 4-6%, Co: 52-61%; the preparation method is that the repair material is baked in an oven first, and then is attached to the damaged area of the sealed track wear-resistant steel strip by laser cladding.

2. The repair coating for a sealed track wear steel belt of claim 1, wherein: After the repair material is attached to the damaged area of the sealed track wear-resistant steel strip by laser cladding, the surface of the sealed track wear-resistant steel strip is subjected to rolling treatment.

3. A repair coating for a sealed track wear steel belt according to claim 1 or 2 or said, characterized by: The average particle size of the cobalt-based alloy powder is 10-30 μm.

4. The repair coating for a sealed track wear steel belt of claim 3, wherein: The mass percentage of C is 0.8%, the mass percentage of Cr is 24.0%, the mass percentage of W is 1.0%, the mass percentage of Ni is 6.0%, and the mass percentage of Co is 61%.

5. The repair coating for a sealed track wear steel belt of claim 3, wherein: The mass percentage of C is 1.0%, the mass percentage of Cr is 26.0%, the mass percentage of W is 2.0%, the mass percentage of Ni is 5.0%, and the mass percentage of Co is 59%.

6. The repair coating for a sealed track wear steel belt of claim 3, wherein: The mass percentage of C is 1.2%, the mass percentage of Cr is 30.0%, the mass percentage of W is 3.0%, the mass percentage of Ni is 4.0%, and the mass percentage of Co is 52%.

7. A method of repairing a sealed racetrack wear strip steel belt characterized by: The repair material in any one of claims 1-6 is used to perform the following steps: S1: the damaged annular sealed track wear-resistant steel strip is made into a flat sheet; S2: the surface of the sealed track wear-resistant steel strip is cleaned; S3: the repair material is baked in an oven; S4: the repair material after baking in step S3 is repaired on the damaged area of the sealed track wear-resistant steel strip by laser cladding; S5: the repaired sealed track wear-resistant steel strip is finished; S6: the finished sealed track wear-resistant steel strip is subjected to surface rolling treatment; S7: the sealed track wear-resistant steel strip after rolling treatment is welded into a ring, and the repaired surface is used as the inner wall of the sealed track wear-resistant steel strip.

8. The method of repairing a sealed racetrack wear-resistant steel strip according to claim 7, characterized in that: In S1, the damaged annular sealed track wear-resistant steel strip is cut once and is subjected to rolling treatment, so that the sealed track wear-resistant steel strip becomes a flat sheet; in S2, the surface of the sealed track wear-resistant steel strip is cleaned with acetone to remove impurities on the surface; in S3, the repair material is baked in a 120°C oven for 30 min; in S5, the repaired wear-resistant steel strip is finished; and in S6, the finished wear-resistant steel strip is subjected to surface rolling treatment.

9. The method of repairing a sealed racetrack wear-resistant steel strip according to claim 7 or 8, characterized in that: In S4, the process parameters for repair are as follows: laser power is 1500-2500 W, scanning speed is 100-200 mm / s, and overlap rate is 50-70%.

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