A flux-cored wire for hardfacing containing cubic boron nitride hard phase

Abstract

The application belongs to the field of welding materials, and particularly relates to a flux-cored wire containing cubic boron nitride hard phase for wear-resistant surfacing, and the flux-cored wire comprises the following components: cubic boron nitride 13.0%-16.0% loaded with Mn-Si-CaO-Y2O3, potassium feldspar powder 3.2%-4.5%, calcium fluoride powder 4.0%-6.5%, titanium white powder 5.0%-8.0%, aluminum powder 2.0%-4.0%, manganese powder 3.2%-4.8%, silicon powder 4.0%-6.0%, molybdenum powder 3.0%-5.0%, chromium powder 2.8%-4.0%, FeV60-C vanadium iron powder 3.0%-4.5%, and the balance is FHT40.37 reduced iron powder. In the application, the contact area between the liquid in the molten pool and the un-melted cubic boron nitride is pure, the non-spontaneous nucleation concentration is increased, the solidified metal grains are refined, the bonding force between the cubic boron nitride and the base body is increased, the cubic boron nitride is not easy to fall off, and the wear resistance of the deposited metal is effectively increased.

Description

Technical Field

[0001] This invention belongs to the field of welding materials technology, specifically a flux-cored welding wire containing a cubic boron nitride hard phase for wear-resistant surfacing welding. Background Technology

[0002] To improve the efficiency of repairing and remanufacturing wear-resistant parts and reduce production costs, the use of flux-cored welding wire to deposit a better wear-resistant layer on the surface of wear-resistant parts is a widely used technique.

[0003] To achieve higher hardness and better wear resistance in the weld overlay (fused metal layer), a hard phase can be added to the flux-cored wire powder, which is highly beneficial for improving the wear-resistant layer's performance. Currently, diamond and cubic boron nitride (cBN) are the hardest hard phases. However, diamond is prone to graphitization at the high temperature of the welding arc, making it unsuitable as a hard phase for addition to flux-cored wires. Therefore, cubic boron nitride (cBN) has become the preferred material for adding a hard phase to flux-cored wires used in wear-resistant weld overlays.

[0004] When using the above technology, the following problems exist: the bonding force between the cubic boron nitride (cBN) hard phase in the wear-resistant layer formed by the weld overlay metal after welding is poor and the weld overlay metal matrix is ​​poor. During production and application, the cubic boron nitride (cBN) hard phase is easy to fall off from the weld overlay alloy matrix, which greatly reduces the wear resistance of the workpiece.

[0005] Experiments show that the purer the contact area between the molten liquid in the weld pool and the cubic boron nitride solid (most of which does not melt) during welding (low sulfur, low phosphorus, low oxygen) and the greater the number of non-spontaneous nucleation sites (resulting in finer grain size of the deposited metal matrix after crystallization), the higher the degree of bonding between the alloy matrix and cubic boron nitride (cBN) after solidification. This makes it less likely for the cubic boron nitride (cBN) particles to detach from the deposited metal matrix, resulting in better wear resistance of the wear-resistant layer. Summary of the Invention

[0006] This invention provides a flux-cored welding wire containing a cubic boron nitride hard phase for wear-resistant surfacing, solving the following technical problem: how to ensure that the contact area between the liquid metal and the hard phase cubic boron carbide particles in the molten pool formed during welding is pure (with low sulfur, phosphorus, and oxygen content) and that the surrounding deposited metal grains are fine after crystallization.

[0007] The present invention adopts the following technical solution:

[0008] A wear-resistant surfacing flux-cored wire containing a cubic boron nitride hard phase includes a flux core and an outer sheath. The outer sheath is circular and wraps around the outside of the flux core. The outer sheath is made of DC04 cold-rolled steel strip with a thickness of 0.3-1.2 mm.

[0009] The chemical composition and amount of the core material, by mass fraction, are as follows: 13.0%-16.0% cubic boron nitride supported on Mn-Si-CaO-Y2O3, 3.2%-4.5% potassium feldspar powder, 4.0%-6.5% calcium fluoride powder, 5.0%-8.0% titanium dioxide, 2.0%-4.0% aluminum powder, 3.2%-4.8% manganese powder, 4.0%-6.0% silicon powder, 3.0%-5.0% molybdenum powder, 2.8%-4.0% chromium powder, 3.0%-4.5% FeV60-C vanadium iron powder, with the balance being FHT40·37 reduced iron powder.

[0010] The chemical composition and amount of the core material, by mass fraction, are as follows: 14.0%-15.0% cubic boron nitride supported on Mn-Si-CaO-Y2O3, 3.5%-4.2% potassium feldspar powder, 4.5%-6.0% calcium fluoride powder, 6.0%-7.0% titanium dioxide, 2.5%-3.5% aluminum powder, 3.8%-4.2% manganese powder, 4.5%-5.5% silicon powder, 3.5%-4.5% molybdenum powder, 3.2%-3.6% chromium powder, 3.5%-4.0% FeV60-C vanadium iron powder, and the balance being FHT40·37 reduced iron powder.

[0011] The chemical composition and amount of the core material, by mass fraction, are as follows: 14.5% cubic boron nitride supported on Mn-Si-CaO-Y2O3, 3.6% potassium feldspar powder, 5.3% calcium fluoride powder, 6.5% titanium dioxide, 3.0% aluminum powder, 4% manganese powder, 5.0% silicon powder, 4.0% molybdenum powder, 3.4% chromium powder, 5.4% FeV60-C vanadium iron powder, and the balance being FHT40·37 reduced iron powder.

[0012] The cubic boron nitride loaded with Mn-Si-CaO-Y2O3 is cubic boron nitride with a particle size of 60μm-80μm loaded with nano-Mn particles, nano-Si particles with nickel plating, nano-CaO particles with nickel plating, and nano-Y2O3 particles with nickel plating.

[0013] The particle size of the nano-Mn particles is 50nm-70nm;

[0014] The nickel-plated nano-Si particles are particles with Si particles inside and a nickel plating layer on the outside. The particle size of the inner Si particles is 50nm-70nm, and the thickness of the outer nickel plating layer is 10nm-20nm.

[0015] The nickel-plated nano-CaO particles are particles with CaO particles inside and a nickel plating layer on the outside. The particle size of the inner CaO particles is 100nm-200nm, and the thickness of the outer nickel plating layer is 10nm-20nm.

[0016] The nickel-plated nano-Y2O3 particles are particles with Y2O3 particles inside and a nickel plating layer on the outside. The particle size of the internal Y2O3 particles is 40nm-60nm, and the thickness of the external nickel plating layer is 10nm-20nm.

[0017] The filling rate of the core is 25%-35%.

[0018] The potassium feldspar powder, calcium fluoride powder, titanium dioxide, aluminum powder, manganese powder, silicon powder, molybdenum powder, chromium powder, FeV60-C vanadium iron powder, and FHT40·37 reduced iron powder have an 80-mesh passing rate of 100%.

[0019] The diameter of the flux-cored welding wire is 2.0-8.0 mm.

[0020] The cubic boron nitride supported on Mn-Si-CaO-Y2O3 is prepared by the following method:

[0021] (1) H2O2 and concentrated H2SO4 were mixed in a volume ratio of 1:3 to obtain a liquid and transferred to a double-necked flask. Cubic boron nitride (cBN) with a particle size of 60μm-80μm, which was 10% of the mass of the liquid, was added and stirred with a polytetrafluoroethylene magnetic rotor for 15 min. After being transferred to a centrifuge tube, it was centrifuged at a centrifugation rate of 12000 r / min for 20 min to obtain solid 1. Solid 1 was ultrasonically dispersed and then washed. Then it was dried at 110℃-120℃ for 60 min to obtain cubic boron nitride with hydroxyl groups on the surface, with a mass of M.

[0022] (2) Prepare a solution with a volume ratio of H2O and anhydrous ethanol of 1:10, with a volume of V. Add 0.1V of cubic boron nitride with surface-loaded hydroxyl groups into the solution and disperse it by ultrasonication. Then add 1% (volume fraction) of γ-mercaptopropylmethyldimethoxysilane and 7% (volume fraction) of ammonia water. Stir at 25°C for 75 min and centrifuge at 10000r / min for 15 min to obtain solid 2.

[0023] (3) Solid 2 was ultrasonically dispersed into anhydrous ethanol of volume V. 3% M nano-manganese powder, 3% M nano-Si particles with nickel plating, 2% M nano-CaO particles with nickel plating, and 1.5% M nano-Y2O3 particles with nickel plating were added to the mixture. The mixture was stirred thoroughly for 60 min and centrifuged at 5000 r / min for 20 min to obtain solid 3, which is cubic boron nitride loaded with Mn-Si-CaO-Y2O3.

[0024] Nickel plating on the surface of nano-Si particles is achieved using a chemical plating process.

[0025] Nickel plating on the surface of nano-CaO particles is achieved using magnetron sputtering.

[0026] Nickel plating on the surface of nano-Y2O3 particles is achieved using a chemical plating process.

[0027] By introducing hydroxyl groups onto the surface of cubic boron nitride (cBN) and then coupling thiol groups in the presence of a coupling agent, the thiol groups can coordinate with manganese and nickel (which contain silicon, calcium oxide, and yttrium oxide), thereby loading manganese and nickel (which contain silicon, calcium oxide, and yttrium oxide) onto the surface of cubic boron nitride.

[0028] The preparation process of flux-cored welding wire is as follows: ① Batching; ② Mixing powder; ③ Bending DC04 cold-rolled steel strip into a U-shape; ④ Adding the mixed flux-cored powder into the U-shaped groove of the steel strip; ⑤ Forming the U-shaped DC04 cold-rolled steel strip into a circle; ⑥ Drawing.

[0029] The present invention has the following beneficial technical effects:

[0030] During welding, the nanoscale manganese, silicon, calcium oxide, and yttrium oxide surrounding the hard cubic boron nitride particles exhibit high activity (nanoscale effect), resulting in strong desulfurization, dephosphorization, and deoxidation capabilities. This makes the contact area between the molten liquid (mainly iron) and the unmelted hard cubic boron nitride in the weld pool extremely pure, with very low sulfur, phosphorus, and oxygen content (especially the excellent dephosphorization effect of calcium oxide-yttrium oxide combined treatment, where the products of phosphorus reaction with calcium oxide and yttrium oxide overflow as scum). The remaining calcium oxide and yttrium oxide that did not participate in dephosphorization can act as secondary nucleation sites, increasing the concentration of non-spontaneous nucleation sites in this area and refining the solidified weld metal. The fine grains of the deposited metal formed by the solidification of the molten pool are firmly bonded to the hard cubic boron nitride phase, which greatly increases the bonding force between iron atoms and the hard cubic boron nitride phase. During operation, the cubic boron nitride is not easily detached, effectively increasing the wear resistance of the deposited metal. Its wear resistance is more than 2.1 times that of the deposited metal prepared by adding hard cubic boron nitride, nano manganese, nano silicon, nano calcium oxide, and nano yttrium oxide to the core powder in a normal mixing manner (nano manganese, nano silicon, nano calcium oxide, and nano yttrium oxide, if added to the core powder, tend to agglomerate into lumps in the formed deposited metal due to the nano-agglomeration effect, resulting in poor effect). Detailed Implementation

[0031] The principles and features of the present invention are described below with reference to embodiments and comparative examples. The embodiments and comparative examples listed are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0032] Example 1:

[0033] A wear-resistant surfacing flux-cored wire containing a cubic boron nitride hard phase includes a flux core and an outer sheath. The outer sheath is circular and wraps around the outside of the flux core. The outer sheath is made of DC04 cold-rolled steel strip with a thickness of 0.8 mm.

[0034] The chemical composition and amount of the core material, by mass fraction, are as follows: 14.5% cubic boron nitride supported on Mn-Si-CaO-Y2O3, 3.6% potassium feldspar powder, 5.3% calcium fluoride powder, 6.5% titanium dioxide, 3.0% aluminum powder, 4% manganese powder, 5.0% silicon powder, 4.0% molybdenum powder, 3.4% chromium powder, 5.4% FeV60-C vanadium iron powder, and the balance being FHT40·37 reduced iron powder.

[0035] Cubic boron nitride loaded with Mn-Si-CaO-Y2O3 consists of cubic boron nitride with a particle size of 60μm-80μm loaded with nano-Mn particles, nano-Si particles with nickel plating, nano-CaO particles with nickel plating, and nano-Y2O3 particles with nickel plating.

[0036] The particle size of the nano-Mn particles is 50nm-70nm;

[0037] The nickel-plated nano-Si particles are particles with Si particles inside and a nickel plating layer on the outside. The particle size of the inner Si particles is 50nm-70nm, and the thickness of the outer nickel plating layer is 10nm-20nm.

[0038] The nickel-plated nano-CaO particles are particles with CaO particles inside and a nickel plating layer on the outside. The particle size of the internal CaO particles is 100nm-200nm, and the thickness of the external nickel plating layer is 10nm-20nm.

[0039] The nickel-plated nano-Y2O3 particles are particles with Y2O3 particles inside and a nickel plating layer on the outside. The particle size of the internal Y2O3 particles is 40nm-60nm, and the thickness of the external nickel plating layer is 10nm-20nm.

[0040] The core filler rate is 30%.

[0041] The 80-mesh passing rate of potassium feldspar powder, calcium fluoride powder, titanium dioxide, aluminum powder, manganese powder, silicon powder, molybdenum powder, chromium powder, FeV60-C vanadium iron powder, and FHT40·37 reduced iron powder is 100%.

[0042] The diameter of the flux-cored welding wire is 5.0 mm.

[0043] The preparation method of cubic boron nitride supported on Mn-Si-CaO-Y2O3 is as follows:

[0044] (1) H2O2 and concentrated H2SO4 were mixed in a volume ratio of 1:3 to obtain a liquid and transferred to a double-necked flask. Cubic boron nitride (cBN) with a particle size of 60μm-80μm, which was 10% of the mass of the liquid, was added and stirred with a polytetrafluoroethylene magnetic rotor for 15 min. After being transferred to a centrifuge tube, it was centrifuged at a centrifugation rate of 12000 r / min for 20 min to obtain solid 1. Solid 1 was ultrasonically dispersed and then washed. Then it was dried at 110℃-120℃ for 60 min to obtain cubic boron nitride with hydroxyl groups on the surface, with a mass of M.

[0045] (2) Prepare a solution with a volume ratio of H2O and anhydrous ethanol of 1:10, with a volume of V. Add 0.1V of cubic boron nitride with surface-loaded hydroxyl groups into the solution and disperse it by ultrasonication. Then add 1% (volume fraction) of γ-mercaptopropylmethyldimethoxysilane and 7% (volume fraction) of ammonia water. Stir at 25°C for 75 min and centrifuge at 10000r / min for 15 min to obtain solid 2.

[0046] (3) Solid 2 was ultrasonically dispersed into anhydrous ethanol of volume V. 3% M nano-manganese powder, 3% M nano-Si particles with nickel plating, 2% M nano-CaO particles with nickel plating, and 1.5% M nano-Y2O3 particles with nickel plating were added to the mixture. The mixture was stirred thoroughly for 60 min and centrifuged at 5000 r / min for 20 min to obtain solid 3, which is cubic boron nitride loaded with Mn-Si-CaO-Y2O3.

[0047] Nickel plating on the surface of nano-Si particles is achieved using a chemical plating process.

[0048] Nickel plating on the surface of nano-CaO particles is achieved using magnetron sputtering.

[0049] Nickel plating on the surface of nano-Y2O3 particles is achieved using a chemical plating process.

[0050] By introducing hydroxyl groups onto the surface of cubic boron nitride (cBN) and then coupling thiol groups in the presence of a coupling agent, thiol groups can coordinate with manganese and nickel (with silicon, calcium oxide, and yttrium oxide inside), thereby loading manganese and nickel (with silicon, calcium oxide, and yttrium oxide inside) onto the surface of cubic boron nitride.

[0051] The preparation process of flux-cored welding wire is as follows: ① Batching; ② Mixing powder; ③ Bending DC04 cold-rolled steel strip into a U-shape; ④ Adding the mixed flux-cored powder into the U-shaped groove of the steel strip; ⑤ Forming the U-shaped DC04 cold-rolled steel strip into a circle; ⑥ Drawing.

[0052] Example 2:

[0053] It is basically the same as Example 1, except that:

[0054] 1) The outer skin is made of DC04 cold-rolled steel strip, and the thickness of DC04 cold-rolled steel strip is 1.2mm;

[0055] 2) The chemical composition and amount of the core material by mass fraction are as follows: 16.0% cubic boron nitride supported on Mn-Si-CaO-Y2O3, 4.5% potassium feldspar powder, 6.5% calcium fluoride powder, 8.0% titanium dioxide, 4.0% aluminum powder, 4.8% manganese powder, 6.0% silicon powder, 5.0% molybdenum powder, 4.0% chromium powder, 4.5% FeV60-C vanadium iron powder, and the balance is FHT40·37 reduced iron powder;

[0056] 3) The filling rate of the core is 35%;

[0057] 4) The diameter of the flux-cored welding wire is 8.0 mm.

[0058] Example 3:

[0059] It is basically the same as Example 1, except that:

[0060] 1) The outer skin is made of DC04 cold-rolled steel strip with a thickness of 0.3mm;

[0061] 2) The chemical composition and amount of the core material by mass fraction are as follows: 13.0% cubic boron nitride supported on Mn-Si-CaO-Y2O3, 3.2% potassium feldspar powder, 4.0% calcium fluoride powder, 5.0% titanium dioxide, 2.0% aluminum powder, 3.2% manganese powder, 4.0% silicon powder, 3.0% molybdenum powder, 2.8% chromium powder, 3.0% FeV60-C vanadium iron powder, and the balance is FHT40·37 reduced iron powder;

[0062] 3) The filling rate of the core is 25%;

[0063] 4) The diameter of the flux-cored welding wire is 2.0 mm.

[0064] Comparative Example 1:

[0065] The comparison example is essentially the same as Example 1, except that the core chemical composition does not contain "14.5% cubic boron nitride supported on Mn-Si-CaO-Y2O3". Comparative Example 2:

[0066] It is basically the same as Example 1, except that “14.5% cubic boron nitride loaded with Mn-Si-CaO-Y2O3” in the chemical composition of the core is changed to “14.5% cubic boron nitride with a particle size of 60μm-80μm”.

[0067] Comparative Example 3:

[0068] It is basically the same as Example 1, except that “14.5% cubic boron nitride loaded with Mn-Si-CaO-Y2O3” in the chemical composition of the core is changed to “14.5% cubic boron nitride with a particle size of 50nm-70nm”.

[0069] Comparative Example 4:

[0070] It is basically the same as Example 1, except that “14.5% cubic boron nitride loaded with Mn-Si-CaO-Y2O3” in the chemical composition of the core is changed to “14.5% cubic boron nitride loaded with Mn-Si-CaO”.

[0071] Comparative Example 5:

[0072] The composition is basically the same as in Example 1, except that "14.5% of cubic boron nitride loaded with Mn-Si-CaO-Y2O3" in the core chemical composition is changed to "13.0% of cubic boron nitride with a particle size of 60μm-80μm, 0.45% of nano Mn particles, 0.45% of nano Si particles with nickel plating, 0.3% of nano CaO particles with nickel plating, and 0.25% of nano Y2O3 particles with nickel plating".

[0073] test:

[0074] The flux-cored welding wires prepared in Examples 1-3 and Comparative Examples 1-5 were used to surface Q235 plates. Wear tests were performed on the deposited metal, and the time required for 0.5 mm of wear was measured. Eight experiments were conducted for each of Examples 1-3 and Comparative Examples 1-5, and the average of the eight results was taken.

[0075] The experimental results are shown in Table 1.

[0076] Table 1

[0077] Example 1 125 Example 2 129 Example 3 121 Comparative Example 1 42 Comparative Example 2 55 Comparative Example 3 63 Comparative Example 4 87 Comparative Example 5 57

[0078] As can be seen from the above embodiments and experimental examples:

[0079] A) As can be seen from Examples 1-3, the weld metal deposited after the flux-cored welding wire prepared by the technical solution of the present invention has good wear resistance. This is because cubic boron nitride is firmly bonded to the matrix and is not easy to fall off. As a hard phase, its presence effectively increases the wear resistance of the weld metal.

[0080] B) As can be seen from Comparative Example 1, if the chemical composition of the core does not contain "cubic boron nitride loaded with Mn-Si-CaO-Y2O3", that is, if there is no hard phase, the wear resistance of the deposited metal is the worst.

[0081] C) As can be seen from Comparative Example 2: If the cubic boron nitride in the chemical composition of the flux core is not surface modified, the cubic boron nitride in the weld metal after welding is easy to fall off, and the wear resistance of the weld metal is poor.

[0082] D) As can be seen from Comparative Example 3: When the surface-modified cubic boron nitride in the flux core chemical composition is replaced with nano-cubic boron nitride, due to the nano-size effect, a large number of positive and negative charges accumulate on the surface of the cubic boron nitride particles, resulting in high surface energy and an unstable energy state. This leads to obvious agglomeration of the nano-cubic boron nitride particles. During the powder mixing process of preparing the flux core welding wire (i.e., mixing the flux core powder evenly), the nano-cubic boron nitride particles are not easily dispersed. The welding process is a process of heat source movement, and the melting and solidification time of the molten pool is short, causing most of the nano-cubic boron nitride particles in the weld metal to agglomerate. The large agglomerated nano-cubic boron nitride is not firmly bonded to the weld metal matrix and is easy to fall off during the wear process, resulting in poor wear resistance of the weld metal.

[0083] E) As can be seen from Comparative Example 4, when the cubic boron nitride in the core chemical composition is surface modified, if there is no nano Y2O3, its dephosphorization effect is poor and the wear resistance of the deposited metal decreases, indicating that the combined dephosphorization effect of CaO-Y2O3 in this invention is good.

[0084] F) As can be seen from Comparative Example 5: the cubic boron nitride in the core chemical composition was not surface modified, but nano aluminum powder, nano manganese powder and nano silicon powder with nickel plating were added to the core. However, the cleanliness around the cubic boron nitride was poor, and the desulfurization, dephosphorization and deoxidation capabilities were weakened, so the wear resistance of the deposited metal was poor.

[0085] Based on the above-described preferred embodiments of the present invention, any technical solutions involving various changes and modifications made according to the above description should be covered within the scope of protection of the present invention.

Claims

1. A flux-cored welding wire containing a cubic boron nitride hard phase for wear-resistant surfacing, comprising a flux core and an outer sheath, wherein the outer sheath is circular and wraps around the outside of the flux core, characterized in that: The outer skin is made of DC04 cold-rolled steel strip; The chemical composition and amount of the core material, by mass fraction, are as follows: cubic boron nitride supported on Mn-Si-CaO-Y2O3 13.0%-16.0%, potassium feldspar powder 3.2%-4.5%, calcium fluoride powder 4.0%-6.5%, titanium dioxide 5.0%-8.0%, aluminum powder 2.0%-4.0%, manganese powder 3.2%-4.8%, silicon powder 4.0%-6.0%, molybdenum powder 3.0%-5.0%, chromium powder 2.8%-4.0%, FeV60-C vanadium iron powder 3.0%-4.5%, with the balance being FHT40·37 reduced iron powder; The cubic boron nitride loaded with Mn-Si-CaO-Y2O3 is cubic boron nitride with a particle size of 60μm-80μm loaded with nano-Mn particles, nano-Si particles with nickel plating, nano-CaO particles with nickel plating, and nano-Y2O3 particles with nickel plating. The particle size of the nano-Mn particles is 50nm-70nm; The nickel-plated nano-Si particles are particles with Si particles inside and a nickel plating layer on the outside. The particle size of the inner Si particles is 50nm-70nm, and the thickness of the outer nickel plating layer is 10nm-20nm. The nickel-plated nano-CaO particles are particles with CaO particles inside and a nickel plating layer on the outside. The particle size of the inner CaO particles is 100nm-200nm, and the thickness of the outer nickel plating layer is 10nm-20nm. The nickel-plated nano-Y2O3 particles are particles with Y2O3 particles inside and a nickel plating layer on the outside. The particle size of the internal Y2O3 particles is 40nm-60nm, and the thickness of the external nickel plating layer is 10nm-20nm. The filling rate of the core is 25%-35%.

2. The wear-resistant surfacing flux-cored wire containing a cubic boron nitride hard phase according to claim 1, characterized in that: the chemical composition and amount of the flux core, by mass fraction, are: 14.0%-15.0% cubic boron nitride loaded with Mn-Si-CaO-Y2O3, 3.5%-4.2% potassium feldspar powder, 4.5%-6.0% calcium fluoride powder, 6.0%-7.0% titanium dioxide, 2.5%-3.5% aluminum powder, 3.8%-4.2% manganese powder, 4.5%-5.5% silicon powder, 3.5%-4.5% molybdenum powder, 3.2%-3.6% chromium powder, 3.5%-4.0% FeV60-C vanadium iron powder, and the balance being FHT40·37 reduced iron powder.

3. The flux-cored welding wire containing cubic boron nitride hard phase for wear-resistant surfacing according to claim 1, characterized in that, The potassium feldspar powder, calcium fluoride powder, titanium dioxide, aluminum powder, manganese powder, silicon powder, molybdenum powder, chromium powder, FeV60-C vanadium iron powder, and FHT40·37 reduced iron powder have an 80-mesh passing rate of 100%.

4. The flux-cored welding wire containing cubic boron nitride hard phase for wear-resistant surfacing according to claim 1, characterized in that, The thickness of the DC04 cold-rolled steel strip is 0.3-1.2 mm.

5. The flux-cored welding wire containing a cubic boron nitride hard phase for wear-resistant surfacing according to claim 1, characterized in that, The diameter of the flux-cored welding wire is 2.0-8.0 mm.