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High-niobium high-chromium alloy cast ion self-protection flux-cored wire for grinding roller surfacing and preparation method thereof

A high-chromium alloy and flux-cored wire technology, which is applied in welding equipment, welding equipment, arc welding equipment, etc., can solve the problem of large fluctuations in the hardness of the deposited metal in the surfacing layer, unstable filling coefficient of welding wire powder, and reduction of the surfacing layer. Wear resistance and other issues, to achieve excellent welding process performance, improve moisture absorption ability, and good fluidity

Active Publication Date: 2016-02-10
CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After adding niobium in the high-chromium high-alloy cast iron system, the fluidity of the molten pool will deteriorate, which will deteriorate the forming quality of the weld; More, the fluidity of the powder is poor, it is easy to cause the filling coefficient of the welding wire powder to be unstable, and the hardness of the deposited metal of the surfacing layer fluctuates greatly, which reduces the wear resistance of the surfacing layer; It is also a process shortcoming that needs to be overcome urgently

Method used

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  • High-niobium high-chromium alloy cast ion self-protection flux-cored wire for grinding roller surfacing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Select a ferritic stainless steel strip with a thickness of 0.6mm and a width of 14mm, and roll it into a U shape; 420g of high-carbon ferrochrome powder, 130g of ferro-niobium, 45g of graphite, 15g of ferrosilicon, 20g of electrolytic manganese, and 15g of medium-carbon ferroboron , 10g aluminum-magnesium alloy, 5g cryolite, 5g fluorite, 10g lithium carbonate, 5g zircon sand, 10g potassium titanate, 15g sodium titanate, 295g iron powder, a total of 1000g powder, potassium titanate, sodium titanate Carry out granulation and pre-sintering, and pass graphite, cryolite, fluorite, lithium carbonate and high-carbon ferrochrome through an 80-mesh sieve, then mix with other powders and stir for 110 minutes, then add to the U-shaped tank, the filling rate is 28%; After the mouth is closed, it undergoes four consecutive drawing and diameter reductions of φ4.0mm, φ3.65mm, φ3.41mm, and φ3.15mm, and the final diameter of the finished welding wire is 3.2mm.

Embodiment 2

[0038]Select a ferritic stainless steel strip with a thickness of 0.6mm and a width of 14mm, and roll it into a U shape; 480g of high-carbon ferrochrome powder, 160g of ferro-niobium, 50g of graphite, 20g of ferrosilicon, 30g of electrolytic manganese, and 20g of medium-carbon ferroboron , 20g aluminum-magnesium alloy, 10g cryolite, 10g fluorite, 15g lithium carbonate, 10g zircon sand, 15g potassium titanate, 20g sodium titanate, 140g iron powder, a total of 1000g powder, potassium titanate, sodium titanate Carry out granulation and pre-sintering, and pass graphite, cryolite, fluorite, lithium carbonate and high-carbon ferrochrome through an 80-mesh sieve, then mix with other powders and stir for 130 minutes, then add to the U-shaped tank, the filling rate is 32%; After the mouth is closed, it undergoes four consecutive drawing and diameter reductions of φ4.0mm, φ3.65mm, φ3.41mm, and φ3.15mm, and the final diameter of the finished welding wire is 3.2mm.

Embodiment 3

[0040] Select a ferritic stainless steel strip with a thickness of 0.6mm and a width of 14mm, and roll it into a U shape; 450g of high-carbon ferrochrome powder, 140g of ferro-niobium, 48g of graphite, 17g of ferrosilicon, 25g of electrolytic manganese, and 18g of medium-carbon ferroboron , 16g aluminum-magnesium alloy, 8g cryolite, 8g fluorite, 12g lithium carbonate, 8g zircon sand, 12g potassium titanate, 18g sodium titanate, 220g iron powder, a total of 1000g powder, potassium titanate, sodium titanate Carry out granulation and pre-sintering, and pass graphite, cryolite, fluorite, lithium carbonate and high-carbon ferrochrome through an 80-mesh sieve, then mix with other powders and stir for 120 minutes, then add to the U-shaped tank, the filling rate is 30%; After the mouth is closed, it undergoes four consecutive drawing and diameter reductions of φ4.0mm, φ3.65mm, φ3.41mm, and φ3.15mm, and the final diameter of the finished welding wire is 3.2mm.

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Abstract

The invention discloses a high-niobium high-chromium alloy cast ion self-protection flux-cored wire for grinding roller surfacing and a preparation method thereof. The flux-cored wire is composed of a ferrite stainless steel band and flux powder wrapped with the ferrite stainless steel band. The flux powder is prepared from, by weight, 42.0-48.0% of high-carbon chromium iron, 13.0-16.0% of niobium iron, 4.5-5.0% of graphite, 1.5-2.0% of silicon iron, 2.0-3.0% of electrolytic manganese, 1.5-2.0% of medium-carbon ferroboron, 1.0-2.0% of aluminum-magnesium alloy, 0.5-1.0% of cryolite, 0.5-1.0% of fluorite, 1.0-1.5% of lithium carbonate, 0.5-1.0% of zircon sand, 1.0-1.5% of potassium titanate, 1.5-2.0% of sodium titanate and the balance iron powder. The preparation method includes the steps that the flux powder is added into a U-type tank after being preprocessed; and four times of continuous drawing and diameter reducing are sequentially carried out after the opening of the U-type tank is closed, and the flux-cored wire is obtained. The flux-cored wire has the advantages that the hardness of deposited metal of a surfacing layer is stable, welding spatter is little and high-stress abrasive wear resistance is good, and is particularly suitable for surfacing repair and remanufacturing of cement grinding rollers.

Description

technical field [0001] The invention relates to a high-niobium-high-chromium alloy cast iron self-shielding flux-cored wire for surfacing welding of grinding rollers and a preparation method thereof, belonging to the technical field of welding materials and processing. Background technique [0002] Grinding rollers are important spare parts in industries such as electric power and cement. They are repeatedly cut by materials during service, and require good abrasive wear resistance. In order to improve the service life of the grinding roller, it is necessary to surfacing high wear-resistant materials on the surface of the grinding roller. At present, high-chromium and high-alloy cast iron self-shielding flux cored wire is mostly used. The high-chromium high-alloy cast iron welding wire is Cr25C5 alloy system. The microstructure is a large amount of columnar or massive chromium carbide distributed on the ledeburite matrix. The hardness of the surfacing layer reaches HRC58-62....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/368B23K35/30B23K35/40B23K9/04
CPCB23K9/048B23K35/0266B23K35/3053B23K35/3086B23K35/368B23K35/406
Inventor 张迪聂祯华季天华王英杰王立志王清宝白波
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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