Flux-cored wire with high wear resistance

Abstract

The invention relates to a high-wear-resistance flux-cored wire, and belongs to the field of flux-cored wires. Comprising the powder and the outer skin, a plurality of auxiliaries are added in the powder, grains are refined, carbide form distribution is improved, the composition of the outer skin is improved, a double-layer structure is adopted, the dilution effect of the outer skin is reduced, and the wear-resistant powder has good hardness and toughness and good wear resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of high wear-resistant flux-cored wire, belong to flux-cored wire field. BACKGROUND

[0002] In the heavy industry field such as mining machinery, cement equipment, agricultural machinery, its key components (such as crushing roller, tooth, conveying pipeline) are subjected to high-strength abrasive wear for a long time, which leads to sharp reduction of equipment life and sharp increase of maintenance cost. Flux-cored wire has become the core material in the field of wear-resistant surfacing due to the flexible design of its core composition. By adding hard phase forming elements such as high-carbon chromium iron and tungsten carbide (WC) in the core, the hardness and wear resistance of the deposited metal can be significantly improved. As an economical and effective surface strengthening method, the core of surfacing technology is to significantly improve the wear resistance of the substrate by depositing a wear-resistant alloy layer. The size of the carbide generated in situ by alloy elements (Cr, V, Mo, etc.) is usually >5 μm and the distribution is uneven, which makes it difficult to break through the abrasive wear resistance and the limit of hard phase strengthening is low. Increasing the carbon content (>4%) can increase the proportion of hard phase, but it will cause the increase of weld brittleness and the sharp rise of cold crack sensitivity, resulting in the contradiction between toughness and hardness. Traditional carbide significantly softens above 600℃, which cannot meet the wear-resistant requirements of high-temperature working conditions (such as cement kiln preheater), and the high-temperature performance is insufficient.

[0003] The design of flux-cored wire formula is the main way to improve wear resistance, but industrial practice shows that the dilution effect of the sheath on the composition of the deposited metal has become an important factor restricting the wear resistance. After the traditional low-carbon steel sheath (C≤0.1%) is melted, it is mixed into the molten pool, which greatly reduces the measured concentration of key elements such as high-carbon and high-chromium in the core. Due to the dilution of the sheath, the actual composition is often below the threshold, which reduces the hard phase; the difference in flowability of the sheath molten metal easily causes the settlement or segregation of hard particles such as tungsten carbide in the molten pool, which reduces the uniformity of the abrasive phase distribution; poor sealing or composition fluctuation of the sheath can cause the oxidation of the flux powder, which causes the loss of alloy elements, further exacerbating the composition deviation. SUMMARY

[0004] According to the problems described in the background, the present application solves the problem of:

[0005] How to prepare a high wear-resistant flux-cored wire that takes into account toughness and reduces the dilution effect of the sheath.

[0006] To achieve the above purpose, the present application provides the following technical scheme:

[0007] A high wear-resistant flux-cored wire, the mass percentage of the flux powder formula is:

[0008] High-carbon chromium iron powder: 40%-55%

[0009] Tungsten carbide powder: 15%-25%

[0010] Molybdenum iron powder: 3%-6%

[0011] Vanadium iron powder: 2%-4%

[0012] Boron iron powder: 1.5%-3%

[0013] Silicon iron powder: 3%-5%

[0014] Manganese iron powder: 3%-5%

[0015] Aluminum powder: 0.5%-1.5%

[0016] Rutile: 4%-8%

[0017] Fluorite: 2%-4%

[0018] Feldspar: 1%-3%

[0019] Rare earth silicon iron: 0.5%-1.5%

[0020] Arc stabilizer: 0.5%-1.5%

[0021] The outer skin is a bimetallic outer skin, the outer layer is a conventional low-carbon steel strip, and the inner layer is a thin layer of nickel powder and high-carbon chromium iron.

[0022] Preferably, the welding method is MAG or self-protection, and the protective gas of the MAG is argon and carbon dioxide.

[0023] Preferably, the ratio of the argon and the carbon dioxide is 5:1.

[0024] Preferably, the mass percentage of the powder formula is: high-carbon chromium iron powder 50%, tungsten carbide powder 21%, molybdenum iron powder 5%, boron iron powder 2%, silicon iron powder 4%, manganese iron powder 4%, aluminum powder 1%, rutile 6%, fluorite 3%, feldspar 2%, rare earth silicon 1%, and arc stabilizer 1%.

[0025] Preferably, the arc stabilizer is lithium carbonate or potassium carbonate.

[0026] Preferably, the particle size of the powder is 250-300 mesh.

[0027] The high-carbon chromium iron powder provides a main Cr and C source, ensures that the Cr content of the deposited metal reaches 25-35%, and the C content reaches 3.5-5.0%; the molybdenum iron powder improves the hardenability, high-temperature strength, and refines the grains to form Mo2C; the vanadium iron powder forms extremely hard VC particles, refines the grains, and strongly resists wear; the boron iron powder significantly improves the hardenability, obtains a high-hardness martensite matrix, and forms borides; the rare earth silicon iron purifies the grain boundaries, refines the grains, improves the distribution of carbide morphology, and improves the comprehensive performance.

[0028] The beneficial effects of the present application are:

[0029] The application has good hardness and toughness and good wear resistance by adjusting the formula, refining the grain, improving the carbide morphology distribution, improving the skin composition and reducing the dilution effect of the skin. DETAILED DESCRIPTION

[0030] Example 1

[0031] A high wear-resistant flux-cored wire, the mass percentage of the flux powder formula is:

[0032] High-carbon chromium iron powder: 40%

[0033] Tungsten carbide powder: 23%

[0034] Molybdenum iron powder: 4%

[0035] Vanadium iron powder: 4%

[0036] Boron iron powder: 3%

[0037] Silicon iron powder: 4%

[0038] Manganese iron powder: 5%

[0039] Aluminum powder: 1%

[0040] Rutile: 6%

[0041] Fluorite: 4%

[0042] Feldspar: 3%

[0043] Rare earth silicon iron: 1.5%

[0044] Lithium carbonate: 1.5%

[0045] The skin thereof is a double-metal skin, the outer layer is a conventional low-carbon steel strip, and the inner layer is a thin layer of nickel powder and high-carbon chromium iron. The particle size of the flux powder is 250 mesh.

[0046] Example 2

[0047] A high wear-resistant flux-cored wire, the mass percentage of the flux powder formula is:

[0048] High-carbon chromium iron powder: 50%

[0049] Tungsten carbide powder: 25%

[0050] Molybdenum iron powder: 3%

[0051] Vanadium iron powder: 4%

[0052] Boron iron powder: 1.5%

[0053] Silicon iron powder: 3%

[0054] Manganese iron powder: 4%

[0055] Aluminum powder: 1.5%

[0056] Rutile: 4%

[0057] Fluorite: 2%

[0058] Feldspar: 1%

[0059] Rare earth ferrosilicon: 0.5%

[0060] Potassium carbonate: 0.5%

[0061] The outer skin is a double metal skin, the outer layer is a conventional low carbon steel strip, and the inner layer is a thin layer of nickel powder and high carbon chromium iron. The particle size of the powder is 300 mesh.

[0062] Example 3

[0063] A high wear-resistant flux-cored wire, the mass percentage of the powder formula is:

[0064] High carbon chromium iron powder: 55%

[0065] Tungsten carbide powder: 15%

[0066] Molybdenum iron powder: 4%

[0067] Vanadium iron powder: 2%

[0068] Boron iron powder: 1.5%

[0069] Silicon iron powder: 5%

[0070] Manganese iron powder: 3%

[0071] Aluminum powder: 0.5%

[0072] Rutile: 8%

[0073] Fluorite: 2%

[0074] Feldspar: 2%

[0075] Rare earth ferrosilicon: 1%

[0076] Lithium carbonate: 1%

[0077] The outer skin is a double metal skin, the outer layer is a conventional low carbon steel strip, and the inner layer is a thin layer of nickel powder and high carbon chromium iron. The particle size of the powder is 270 mesh.

[0078] Example 4

[0079] A high wear-resistant flux-cored wire, the mass percentage of the powder formula is:

[0080] High carbon chromium iron powder: 45%

[0081] Tungsten carbide powder: 20%

[0082] Molybdenum iron powder: 6%

[0083] Ferrovanadium powder: 3%

[0084] Boron iron powder: 2%

[0085] Ferrosilicon powder: 4%

[0086] Ferromanganese powder: 4%

[0087] Aluminum powder: 1%

[0088] Rutile: 8%

[0089] Fluorite: 3%

[0090] Feldspar: 2%

[0091] Rare earth ferrosilicon: 1%

[0092] Potassium carbonate: 1%

[0093] The outer layer is a bimetallic outer layer, which is a conventional low-carbon steel strip, and the inner layer is a thin layer of nickel powder and high-carbon ferrochrome. The powder particle size is 280 mesh.

[0094] Table 1 Performance test data of Examples 1-4

[0095]

Claims

1. A highly wear-resistant flux-cored welding wire, characterized in that: The mass percentage of the powder formula is: High carbon ferrochrome powder: 40%-55% Tungsten carbide powder: 15%-25% Ferromolybdenum powder: 3%-6% Ferrovanadium powder: 2%-4% Boron iron powder: 1.5%-3% Ferrosilicon powder: 3%-5% Ferromanganese powder: 3%-5% Aluminum powder: 0.5%-1.5% Rutile: 4%-8% Fluorite: 2%-4% Feldspar: 1%-3% Rare earth ferrosilicon: 0.5%-1.5% Arc stabilizer: 0.5%-1.5% Its outer skin is a bimetallic skin, the outer layer is a conventional low-carbon steel strip, and the inner layer is nickel powder and a thin layer of high-carbon ferrochrome.

2. A highly wear-resistant flux-cored welding wire according to claim 1, characterized in that: The welding method adopted is MAG or self-shielded, and the shielding gas of the MAG is argon and carbon dioxide.

3. The high wear-resistant flux-cored welding wire according to claim 2, characterized in that: The ratio of argon to carbon dioxide is 5:

1.

4. The high wear-resistant flux-cored welding wire according to claim 1, characterized in that: The powder formula comprises the following mass percentages: 50% high-carbon ferrochrome powder, 25% tungsten carbide powder, 3% ferromolybdenum powder, 4% ferrovanadium powder, 1.5% ferroboron powder, 3% ferrosilicon powder, 4% ferromanganese powder, 1.5% aluminum powder, 4% rutile, 2% fluorite, 1% feldspar, 0.5% rare earth silicon, and 0.5% arc stabilizer.

5. The high wear-resistant flux-cored welding wire according to claim 1, characterized in that: The arc stabilizer is lithium carbonate or potassium carbonate.

6. The high wear-resistant flux-cored welding wire according to claim 1, characterized in that: The particle size of the medicinal powder is 250-300 meshes.

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