Wear-resistant iron-based welding wire

Abstract

The wear-resistant iron-based welding wire comprises an outer skin and a powder core, the outer skin is made of stainless steel, and the powder core comprises metal nitride, cemented carbide particles, metal powder, a deoxidizing agent and other powder. The metal nitride is adopted in the powder core of the welding wire to provide nitrogen, the phase of a welding layer is stabilized to be austenite, nickel is replaced, and the welding layer of the welding wire has the non-magnetic characteristic and meanwhile has high abrasion resistance during welding.

Description

Technical Field

[0001] The invention relates to the technical field of welding, in particular to a wear-resistant iron-based welding wire. Background Art

[0002] In geological exploration or oil and gas drilling operations, the detection of the geomagnetic field is used to adjust the direction of the drill bit. The drill bit cannot be magnetized under the action of the geomagnetic field, so non-magnetic materials must be used. In the process of friction with the rock, the components supporting the drill bit, such as the drill collar, will be severely worn, thereby changing the direction of the drill bit and affecting the progress of drilling adjustment. In severe cases, the drill bit will break and fall off, causing a large amount of economic losses. Surfacing wear-resistant alloys on the surface of non-magnetic parts can effectively solve the problem of poor wear resistance, but in order not to affect the detection of the geomagnetic field, the wear-resistant alloy must also be non-magnetic (non-magnetic, not magnetized by the magnetic field). Face-centered cubic crystal structures such as austenite are the best materials. Considering the cost, austenitic iron-based materials are the most suitable wear-resistant non-magnetic alloys.

[0003] Existing wear-resistant austenitic non-magnetic alloys mainly rely on adding a large amount of Ni and Mn elements to improve the stability of austenite. However, Ni reserves in my country are small, the cost is high, and it is also a strategic scarce resource in my country.

[0004] Therefore, it is necessary to provide an iron-based welding wire for surfacing wear-resistant alloys on the surface of non-magnetic parts, which can provide a non-magnetic wear-resistant layer and reduce the use of nickel in the surfacing operation. Summary of the invention

[0005] The main technical problem solved by the present invention is to provide a wear-resistant iron-based welding wire, which can save nickel in the surfacing process and obtain a non-magnetic and wear-resistant metal welding layer.

[0006] To solve the above technical problems, the present invention provides a wear-resistant iron-based welding wire, including an outer skin and a powder core, the outer skin is stainless steel, and the powder core contains powders such as metal nitrides, hard carbide particles, alloy powders and deoxidizers.

[0007] The beneficial effect of the present invention is that the wear-resistant iron-based welding wire of the embodiment of the present invention uses metal nitrides to provide nitrogen in the powder core, replacing the use of nickel. During welding operations, the formation of the austenite structure of the weld layer is more stable, so that the weld layer has non-magnetic properties and can also improve wear resistance. DETAILED DESCRIPTION

[0008] The preferred embodiments of the present invention are described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0009] The wear-resistant iron-based welding wire of the embodiment of the present invention comprises an outer sheath and a powder core, the outer sheath is stainless steel, preferably 410 stainless steel (composition see GB / T 20878-2017, unified digital code: S41010, grade: 12Cr13).

[0010] The powder core includes powders such as metal nitride, hard carbide particles, alloy powder and deoxidizer. Metal nitride includes manganese nitride and chromium nitride. Hard carbide particles include at least one of tungsten carbide, chromium carbide and titanium carbide. Metal powder includes metal chromium, ferromolybdenum and metal molybdenum. Among them, manganese can increase the solubility of nitrogen in the metal nitride in the weld layer during welding, and chromium and molybdenum can increase the strength of the alloy. The deoxidizer is mainly 75# ferrosilicon (the mass percentage of Si is 75%, and the balance is Fe) and metal manganese. Manganese and silicon can be combined for deoxidation to reduce oxide inclusions in the weld.

[0011] The weight coefficient of the powder core in the wear-resistant iron-based welding wire of the embodiment of the present invention is 25%-30%.

[0012] In a specific embodiment of the present invention, the powder core of the wear-resistant iron-based welding wire comprises: chromium metal, 20%-45%; manganese nitride, 20%-50%; chromium nitride, 2%-15%; 75# ferrosilicon, 4%-8%; manganese metal, 5-15%; tungsten carbide, 6%-50%; chromium carbide, 0-30%; titanium carbide, 2%-20%; ferromolybdenum, 0%-10%; metal molybdenum, 0%-10%; iron, the remainder. The above percentages are mass percentages.

[0013] In another specific embodiment of the present invention, the powder core of the wear-resistant iron-based welding wire comprises: chromium metal, 20%-28%; manganese nitride, 25%-38%; chromium nitride, 2%-5%; 75# ferrosilicon, 4%-6%; manganese metal, 8%-10%; tungsten carbide, 30%-45%; chromium carbide, 6%-10%; molybdenum metal, 3%-6%; iron, the remainder. The above percentages are mass percentages.

[0014] In another specific embodiment of the present invention, the powder core of the wear-resistant iron-based welding wire comprises: chromium metal, 20%-28%; manganese nitride, 25%-38%; chromium nitride, 2%-5%; 75# ferrosilicon, 4%-6%; manganese metal, 8-10%; tungsten carbide, 10%-15%; chromium carbide, 18%-20%; molybdenum metal, 3%-6%; iron, the remainder. The above percentages are mass percentages.

[0015] In another specific embodiment of the present invention, the powder core of the wear-resistant iron-based welding wire comprises: chromium metal, 20%-28%; manganese nitride, 25%-38%; chromium nitride, 2%-5%; 75# ferrosilicon, 4%-6%; manganese metal, 8%-10%; tungsten carbide, 10%-15%; chromium carbide, 10%-13%; titanium carbide, 8%-11%; molybdenum metal, 3%-6%; iron, the remainder. The above percentages are mass percentages.

[0016] The diameter of the wear-resistant iron-based welding wire is 1.2mm-1.6mm. The particle size of the powder in the powder core is 60-80 mesh.

[0017] The wear-resistant iron-based welding wire in the embodiment of the present invention uses metal nitrides such as manganese nitride and chromium nitride as nitrogen sources, which is beneficial to the formation and stabilization of the austenite structure in the weld layer, replaces the use of nickel, and makes the weld layer non-magnetic; at the same time, the wear resistance of the entire weld layer is improved through the hard carbide particles.

[0018] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A wear-resistant iron-based welding wire, comprising an outer skin and a powder core, wherein the outer skin is made of stainless steel, characterized in that: The powder core comprises powders such as metal nitride, hard carbide particles, metal powder and deoxidizer.

2. The wear-resistant iron-based welding wire according to claim 1, characterized in that: Metal nitrides include manganese nitride and chromium nitride.

3. The wear-resistant iron-based welding wire according to claim 2, characterized in that: Cemented carbide particles include tungsten carbide, chromium carbide, and titanium carbide.

4. The wear-resistant iron-based welding wire according to claim 3, characterized in that: The mass percentage composition of the powder core includes: metallic chromium, 20%-45%; manganese nitride, 20%-50%; chromium nitride, 2%-15%; 75# ferrosilicon, 4%-8%; metallic manganese, 5-15%; tungsten carbide, 6%-50%; chromium carbide, 0-30%; titanium carbide, 2%-20%; ferromolybdenum, 0%-10%; metallic molybdenum, 0%-10%; iron, the remainder.

5. The wear-resistant iron-based welding wire according to claim 3, characterized in that: The mass percentage composition of the powder core includes: metallic chromium, 20%-28%; manganese nitride, 25%-38%; chromium nitride, 2%-5%; 75# ferrosilicon, 4%-6%; metallic manganese, 8%-10%; tungsten carbide, 30%-45%; chromium carbide, 6%-10%; metallic molybdenum, 3%-6%; iron, the remainder. The above percentages are mass percentages.

6. The wear-resistant iron-based welding wire according to claim 3, characterized in that: The mass percentage composition of the powder core includes: metallic chromium, 20%-28%; manganese nitride, 5%-38%; chromium nitride, 2%-5%; 75# ferrosilicon, 4%-6%; metallic manganese, 8-10%; tungsten carbide, 10%-15%; chromium carbide, 18%-20%; metallic molybdenum, 3%-6%; iron, the balance.

7. The wear-resistant iron-based welding wire according to claim 3, characterized in that: The mass percentage composition of the powder core includes: metallic chromium, 20%-28%; manganese nitride, 25%-38%; chromium nitride, 2%-5%; 75# ferrosilicon, 4%-6%; metallic manganese, 8%-10%; tungsten carbide, 10%-15%; chromium carbide, 10%-13%; titanium carbide, 8%-11%; metallic molybdenum, 3%-6%; iron, the balance.

8. The wear-resistant iron-based welding wire according to claim 3, characterized in that: The diameter of wear-resistant iron-based welding wire is 1.2mm-1.6mm.

9. The wear-resistant iron-based welding wire according to claim 3, characterized in that: The weight coefficient of the powder core is 25%-30%.