Special flux-cored wire for surfacing repair of BD roller

A technology of flux-cored welding wire and flux core, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of amorphous products and poor quality, and achieve high resistance to cold and heat alternating thermal fatigue performance, Effect of improving roll life

Inactive Publication Date: 2010-08-18
邯郸市永固冶金备件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are not many varieties of surfacing flux-cored welding wires for repairing rolls at home and abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 21.5% high-carbon ferrochrome, 3% micro-carbon ferrochrome, 4% manganese metal, 7.9% ferromolybdenum, 5.1% ferro-tungsten, 6.5% ferro-vanadium, 3% ferro-titanium, 5% cryolite, 2% yttrium-based rare earth, Iron powder 42%.

[0020] The filling factor is 35+0.5%, and the average surface hardness of the BD roll after repair is HRC=56.7. Since 2009, the BD roll has been surfacing and repaired for Rizhao Steel Rolling Plant. The shape is complex and the volume is heavy, and the stress concentration of the roll is serious during the surfacing process. Cracks are easily generated at the deep root of the surfacing groove with the current commercially available flux-cored welding wire. , high crack resistance, can use lower temperature surfacing welding, can not produce cracks, simplifies the process, facilitates the operation of workers, and reduces the cost. The average surface hardness of the finished BD rolls after overlay welding is HRC=55.6.

[0021] According to the use...

Embodiment 2

[0023] 18% high-carbon ferrochrome, 5% manganese metal, 8% ferromolybdenum, 5.5% ferro-tungsten, 6% ferro-vanadium, 4.5% ferro-titanium, 6% cryolite, 46.8% iron powder, 0.2% ferro-niobium.

[0024] Filling factor = 39.5 ± 0.5% The average surface hardness of the BD roll after repairing is HRC = 52.3. This welding wire is used to repair the vertical roll of the No. 2 Rolling Mill of Anyang Iron and Steel Group. The amount of passing steel is more than 2.5 times that of the original base metal.

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Abstract

The invention discloses a special flux-cored wire for surfacing repair of a BD roller, which consists of a tube skin and a flux core, wherein the tube skin is an H08A steel strip, and the flux core comprises the following components by weight percent: 15-25% of high-carbon ferrochrome, 2-10% of micro-carbon ferrochrome, 5-7% of metal manganese, 6-12% of ferromolybdenum, 3-10% of ferrotungsten, 5-10% of ferrovanadium, 0.5-6% of ferrotitanium, 0.3-5% of yttrium-based rare-earth, 1-3% of ferrocolumbium, 4-10% of cryolite and 10-50% of ferrous powder, wherein the filling coefficient is 30-45%. The special flux-cored wire selects a Cr-Mo-W-V alloy system with optimal alloy matching and carries out Ti-Nb-Re micro-alloy grain refinement, thereby leading a surfacing repair layer to have the advantages of high hardness, high wear resistance, high toughness and high anti-cold and hot alternating thermal fatigue performance, and exponentially prolonging the service life of the BD roller after surfacing repair in comparison with the BD roller after the ordinary roller flux-cored wire repair.

Description

technical field [0001] The invention relates to a flux-cored welding wire, in particular to a flux-cored welding wire special for BD roller surfacing welding. It is applied to case hardening of BD rolls. Hard surface technology is one of the most important components of surface modification technology, and it is a high-tech industrial application technology widely used in the world. Hard surfacing is the biggest bright spot in hard surface technology. The surfacing flux-cored welding wire used in hard surface surfacing is the fourth generation of welding materials developed after welding rods, solid welding wires and gas shielded welding wires, and is a high-tech product. Among them, the part with the highest technical content is the formula design of surfacing flux cored wire. Background technique [0002] my country's steel production ranks first in the world for many years in a row. In 2009, the steel production was 567.8 million tons. It is reported that the annual c...

Claims

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Application Information

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IPC IPC(8): B23K35/30
Inventor 赵春祥
Owner 邯郸市永固冶金备件有限公司
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