Wear-resistant iron-based welding wire

Abstract

A wear-resistant iron-based welding wire, comprising a sheath and a flux core, wherein the sheath is made of stainless steel, and the flux core comprises metal nitrides, hard carbide particles, metal powder and deoxidizer powder.

Description

Wear-resistant iron-based welding wire

[0001] Cross-reference to related applications

[0002] This disclosure claims priority to Chinese patent application No. 202411706522.3, filed on November 26, 2024, the entirety of which is incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of welding technology, and in particular to a wear-resistant iron-based welding wire. Background Technology

[0004] In geological exploration or oil and gas drilling operations, the geomagnetic field is detected to adjust the drill bit's trajectory. The drill bit cannot be magnetized under the influence of the geomagnetic field, therefore non-magnetic materials must be used. During continuous friction with the rock, components supporting the drill bit, such as drill collars, experience severe wear, altering the drill bit's direction and affecting the drilling adjustment progress. In severe cases, breakage can occur, causing the drill bit to fall off and resulting in significant economic losses. Overlaying wear-resistant alloys onto the surface of non-magnetic components can effectively solve the problem of poor wear resistance. However, to avoid interfering with geomagnetic field detection, the wear-resistant alloy must also be non-magnetic (non-magnetic and not magnetized by a magnetic field). Face-centered cubic crystal structures like austenitic materials are the best choice. Considering cost, austenitic iron-based materials are the most suitable wear-resistant non-magnetic alloys.

[0005] Existing wear-resistant austenitic non-magnetic alloys mainly rely on adding large amounts of Ni and Mn elements to improve the stability of austenite. However, Ni reserves in my country are limited, its cost is high, and it is also a strategically scarce resource in my country.

[0006] Therefore, it is necessary to provide an iron-based welding wire for overlaying wear-resistant alloys onto the surface of non-magnetic components, which can provide a non-magnetic wear-resistant layer and reduce the use of nickel during the overlaying operation. Summary of the Invention

[0007] The main technical problem addressed by this disclosure is to provide a wear-resistant iron-based welding wire that can save nickel during the welding process while obtaining a non-magnetic and wear-resistant metal weld layer.

[0008] To solve the above-mentioned technical problems, this disclosure provides a wear-resistant iron-based welding wire, including an outer sheath and a powder core. The outer sheath is made of stainless steel, and the powder core contains metal nitrides, hard carbide particles, alloy powder, and deoxidizer powder.

[0009] The beneficial effects of this disclosure are: the wear-resistant iron-based welding wire of this disclosure uses metal nitrides to provide nitrogen in the powder core, replacing the use of nickel. During welding operations, the formation of the austenitic structure of the weld layer is more stable, which can improve the wear resistance when the weld layer has non-magnetic properties. Detailed Implementation

[0010] The preferred embodiments of this disclosure are described in detail below so that the advantages and features of this disclosure can be more easily understood by those skilled in the art, thereby providing a clearer and more definite definition of the scope of protection of this disclosure.

[0011] The wear-resistant iron-based welding wire of this disclosure includes an outer sheath and a powder core. The outer sheath is made of stainless steel, preferably 410 stainless steel (composition see GB / T 20878-2017, unified digital code: S41010, grade: 12Cr13).

[0012] The core powder comprises metal nitrides, hard carbide particles, alloy powder, and deoxidizer powder. Metal nitrides include manganese nitride and chromium nitride. Hard carbide particles include at least one of tungsten carbide, chromium carbide, and titanium carbide. Metal powders include metallic chromium, ferromolybdenum, and metallic molybdenum. Manganese increases the solubility of nitrogen in the metal nitrides in the weld layer during welding, while chromium and molybdenum improve alloy strength. The deoxidizer is primarily 75# ferrosilicon (75% Si by mass, balance Fe) and metallic manganese; manganese and silicon work together to deoxidize and reduce oxide inclusions in the weld.

[0013] The weight coefficient of the powder core in the wear-resistant iron-based welding wire of this disclosure embodiment is 25%-30%.

[0014] In one specific embodiment of this disclosure, the core powder composition of the wear-resistant iron-based welding wire 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%; and iron, the balance. All percentages are by weight.

[0015] In another specific embodiment of this disclosure, the powder core of the wear-resistant iron-based welding wire comprises: 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%; and iron, balance. All percentages are by weight.

[0016] In another specific embodiment of this disclosure, the core composition of the wear-resistant iron-based welding wire 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, 18%-20%; metallic molybdenum, 3%-6%; and iron, the balance. All percentages are by weight.

[0017] In another specific embodiment of this disclosure, the core composition of the wear-resistant iron-based welding wire 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%; and iron, balance. All percentages are by weight.

[0018] The diameter of the wear-resistant iron-based welding wire is 1.2mm-1.6mm. The particle size of the powder in the core is 60-80 mesh.

[0019] The wear-resistant iron-based welding wire of this disclosure uses metal nitrides such as manganese nitride and chromium nitride as nitrogen sources, which is beneficial to the formation and stability of austenite structure in the weld layer, replacing the use of nickel and giving the weld layer a non-magnetic characteristic; at the same time, the hard carbide particles improve the overall wear resistance of the weld layer.

[0020] The above description is merely an embodiment of this disclosure and does not limit the patent scope of this disclosure. Any equivalent structural or procedural transformations made using the content of this disclosure, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this disclosure.

Claims

1. A wear-resistant iron-based welding wire, comprising an outer sheath and a powder core, wherein the outer sheath is stainless steel, characterized in that, The powder core contains metal nitrides, hard carbide particles, metal powder, and deoxidizer powder.

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, Hard 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 powder core's mass percentage composition 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%; and iron, balance.

5. The wear-resistant iron-based welding wire according to claim 1, characterized in that, The powder core's mass percentage composition 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%; and iron, balance.

6. The wear-resistant iron-based welding wire according to claim 1, characterized in that, The powder core's mass percentage composition 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%; and iron, balance.

7. The wear-resistant iron-based welding wire according to claim 3, characterized in that, The powder core's mass percentage composition 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%; and iron, balance.

8. The wear-resistant iron-based welding wire according to any one of claims 1-7, 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 any one of claims 1-7, characterized in that, The weight coefficient of the powder core is 25%-30%.