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Nitrogen and boron alloying high tenacity hardfacing flux-cored wire

A technology of boron alloying and high toughness, which is applied in welding medium, welding equipment, metal processing equipment, etc., can solve the problems of short service life, high carbon equivalent, poor wear resistance, etc., to improve the performance of welding crack resistance, The effect of increasing the hardness of the surfacing layer and reducing the carbon equivalent

Active Publication Date: 2013-01-23
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional surfacing flux-cored wire has low hardness, poor wear resistance and short service life.
The current hardfacing alloy flux-cored wire materials are generally alloyed with carbon, which has high carbon equivalent, poor welding crack resistance, low plasticity, easy peeling, low high temperature stability, and poor corrosion resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] High carbon ferrochromium, chromium powder, ferroniobium, NaN 3 , BN, ferromolybdenum and rare earth oxides are evenly mixed in a certain proportion, so that the weight percentage of carbon, chromium, niobium, boron, nitrogen, molybdenum and rare earth elements in the core powder is: carbon 1.0%, chromium 35% %, niobium 1.0%, boron 3.0%, nitrogen 2.0%, molybdenum 1.0%, rare earth 1.0%, and the balance is iron or other impurities. Choose 12×0.2 (width 12mm, thickness 0.2mm) H08A cold-rolled steel strip. Roll it into a U shape first. The particle size of the powder obtained is such that it can pass through a 70-mesh sieve. Put the various powders taken into the powder mixer and mix for 40 minutes, then add the mixed powder into the H08A cold-rolled steel strip groove, the filling rate is 42%, close the U-shaped groove, and wrap the powder in it. Then use a wire drawing machine to draw and reduce the diameter one by one, and finally make the diameter reach 2.8mm. The f...

Embodiment 2

[0023] High carbon ferrochromium, chromium powder, ferroniobium, NaN 3 , BN, ferromolybdenum and rare earth oxides are uniformly mixed in a certain proportion, so that the weight percentage of carbon, chromium, niobium, boron, nitrogen, molybdenum and rare earth elements in the core powder is: carbon 1.5%, chromium 36 %, niobium 1.5%, boron 4.0%, nitrogen 3.0%, molybdenum 1.5%, rare earth 1.5%, and the balance is iron or other impurities. Choose 12×0.2 (width 12mm, thickness 0.2mm) H08A cold-rolled steel strip. Roll it into a U shape first. The particle size of the powder obtained is such that it can pass through a 70-mesh sieve. Put the various powders taken into the powder mixer and mix for 40 minutes, then put the mixed powder into the U-shaped H08A cold-rolled steel belt groove, the filling rate is 42%, close the U-shaped groove, and wrap the powder in it. Then use a wire drawing machine to draw and reduce the diameter one by one, and finally make the diameter reach 2.8...

Embodiment 3

[0025] High carbon ferrochromium, chromium powder, ferroniobium, NaN 3 , BN, ferromolybdenum and rare earth oxides are evenly mixed in a certain proportion, so that the weight percentage of carbon, chromium, niobium, boron, nitrogen, molybdenum and rare earth elements in the core powder is: carbon 1.5%, chromium 38 %, niobium 2.0%, boron 6.0%, nitrogen 5.0%, molybdenum 1.5%, rare earth 2.0%, and the balance is iron or other impurities. Choose 14×0.3 (width 14mm, thickness 0.3mm) H08A cold-rolled steel strip. Roll it into a U shape first. The particle size of the powder obtained is such that it can pass through a 70-mesh sieve. Put the various powders taken into the powder mixer and mix for 40 minutes, then put the mixed powder into the U-shaped H08A cold-rolled steel belt groove, the filling rate is 48%, close the U-shaped groove, and wrap the powder in it. Then use a wire drawing machine to draw and reduce the diameter one by one, and finally make the diameter reach 3.2 mm...

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PUM

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Abstract

The invention relates to a nitrogen and boron alloying high tenacity hardfacing flux-cored wire. The skin of the nitrogen and boron alloying high tenacity hardfacing flux-cored wire adopts a mild-carbon steel strip, and the core part is filled with alloy or mineral powder, and is pulled into a wire. The nitrogen and boron alloying high tenacity hardfacing flux-cored wire is characterized in that nitrogen and boron compounds, such as NaN3, BN and the like and a rear earth oxide are added into flux-cored powder to realize the surfacing metal nitrogen and boron alloying. The flux-cored wire comprises chemical components (weight percentage) including 1.0-3.0 % of carbon, 35-40% of chromium, 1.0-2.0% of niobium, 3.0-8.0% of boron, 2.0-5.0% of nitrogen, 1.0-2.0% of molybdenum, 1.0-2.5% of rare earth oxide, and the balance of iron or other impurities. Because the flux-cored wire adopts nitrogen and boron to replace part of carbon alloying surfacing metal, the hardness of a surfacing layer is high, and the highest hardness can reach HRC 66-69. The nitrogen and boron alloying high tenacity hardfacing flux-cored wire has the advantages of favorable toughness and outstanding wear resistance. The nitrogen and boron alloying high tenacity hardfacing flux-cored wire can be mainly used for the surfacing repair and the composite manufacturing of easily-damaged parts of ferrous metallurgy equipment, building machinery and the like.

Description

technical field [0001] The invention belongs to the technical field of welding wire materials, and in particular relates to a high-nitrogen and boron alloyed wear-resistant surfacing flux-cored welding wire, which is mainly used for surfacing welding repair and composite manufacturing of vulnerable parts such as iron and steel metallurgical equipment and construction machinery. Background technique [0002] At present, most wear-resistant surfacing materials are mainly high-chromium cast iron, which contains carbon, chromium, silicon, manganese and other alloying elements, and certain strong carbide-forming elements. The powder core material has strong practicability, higher hardness than general surfacing powder core materials, better wear resistance, and greatly improved machining performance. Surfacing flux-cored wire is favored by merchants because it can greatly improve the efficiency of surfacing repair or surfacing composite manufacturing, save time, and create more e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/368
Inventor 银锐明李静侯清麟
Owner HUNAN UNIV OF TECH
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