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A surfacing flux-cored wire for hot forging die repair

A technology of hot forging dies and welding flux, applied in welding medium, manufacturing tools, welding equipment, etc., can solve problems such as insufficient crack resistance, achieve arc stability, good surfacing welding processability, and meet repair needs

Inactive Publication Date: 2016-11-02
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of insufficient crack resistance of current surfacing materials, and at the same time have high thermal stability and hardness. After tempering at 550°C, the hardness can maintain 48-52HRC, which is better than traditional products.

Method used

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  • A surfacing flux-cored wire for hot forging die repair
  • A surfacing flux-cored wire for hot forging die repair
  • A surfacing flux-cored wire for hot forging die repair

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]Take 500g of sodium fluoride, 750g of calcium fluoride, 500g of rutile, 430g of quartz, 430g of high-carbon ferrochrome, 2480g of pure chromium powder, 600g of pure nickel powder, 150g of ferrotungsten powder, 510g of electrolytic manganese, 2730g of ferromolybdenum powder, and ferrosilicon powder 610g, vanadium iron powder 140g, reduced iron powder 170g. Add the obtained flux-cored powder into the U-shaped steel strip groove with a filling rate of 30%, close the U-shaped groove to obtain a surfacing flux-cored wire with a diameter of 2.4mm, and prepare the surfacing layer according to the above-mentioned process, and the obtained The alloy composition in the deposited metal is: C: 0.05wt.%; Cr: 8.5wt.%; Ni: 1wt.%; W: 0.2wt.%; Mn: 0.8wt.%; Mo: 4.3wt.%; : 0.6wt.%; V: 0.25wt.%; Fe: balance.

Embodiment 2

[0044] Take 200g of sodium fluoride, 550g of calcium fluoride, 350g of rutile, 100g of quartz, 1320g of high carbon ferrochrome, 3830g of pure chromium powder, 1130g of pure nickel powder, 350g of tungsten iron powder, 250g of electrolytic manganese, 1470g of molybdenum iron powder, ferrosilicon powder 360g, 20g of vanadium iron powder, 70g of reduced iron powder. Add the obtained flux-cored powder into the U-shaped steel strip groove with a filling rate of 30%, close the U-shaped groove to obtain a surfacing flux-cored wire with a diameter of 2.4mm, and prepare the surfacing layer according to the above-mentioned process, and the obtained The alloy composition in the deposited metal is: C: 0.25wt.%; Cr: 13.5wt.%; Ni: 2.6wt.%; W: 1.2wt.%; Mn: 0.45wt.%; Mo: 2.5wt.%; Si: 0.1wt.%; V: 0.05wt.%; Fe: balance.

Embodiment 3

[0046] Take 600g of sodium fluoride, 500g of calcium fluoride, 550g of rutile, 500g of quartz, 530g of high-carbon ferrochrome, 2580g of pure chromium powder, 650g of pure nickel powder, 200g of ferrotungsten powder, 460g of electrolytic manganese, 2630g of ferromolybdenum powder, and ferrosilicon powder 560g, vanadium iron powder 130g, reduced iron powder 110g. Add the obtained flux-cored powder into the U-shaped steel strip groove with a filling rate of 30%, close the U-shaped groove to obtain a surfacing flux-cored wire with a diameter of 2.4mm, and prepare the surfacing layer according to the above-mentioned process, and the obtained The alloy composition in the deposited metal is: C: 0.1wt.%; Cr: 9wt.%; Ni: 1.6wt.%; W: 0.3wt.%; Mn: 0.65wt.%; Mo: 4.1wt.%; : 0.5wt.%; V: 0.2wt.%; Fe: balance.

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Abstract

The invention discloses a surfacing flux-cored wire used for repairing a hot-forging die and belongs to the technical field of welding materials. Flux-cored powder is wrapped by adopting a carbon steel belt, and comprises the following substances in mass percentage content: 2-6 percent of sodium fluoride, 5-8 percent of calcium fluoride, 3-5.5 percent of rutile, 1-5 percent of quartz, 4.3-13.2 percent of high-carbon ferrochrome, 24.8-38.3 percent of pure chromium powder, 6-11.3 percent of nickel powder, 1.5-3.5 percent of Fe-W powder, 2.5-5.1 percent of electrolytic manganese, 14.7-27.3 percent of Fe-Mo powder, 3.6-6.1 percent of ferrosilicon powder, 0.2-1.4 percent of ferrovanadium powder and the balance of reduced iron powder. The filling rate of the flux-cored wire is 20-35 percent. Compared with traditional materials, the surfacing flux-cored wire disclosed by the invention has the advantages that (1) the thermal stability and the thermal fatigue resistance are very good, and the hardness range is 48-52HRC; (2) surfacing metal is high in crack resistance, so that preheating before welding or immediate heat treatment after welding is not needed; (3) the surfacing manufacturability is good, and the appearance of a weld is attractive.

Description

technical field [0001] The invention belongs to the field of welding materials for material processing, and in particular relates to a surfacing flux-cored welding wire used for repairing hot forging dies. Background technique [0002] The working conditions of the hot forging die are complex. During the hot forging process, the metal on the surface of the die cavity is heated so that its hardness and strength are significantly reduced, and thermal fatigue occurs under the action of repeated heat and cold. In addition, the metal surface of the die cavity is still under working conditions. There will be deformation, oxidation, wear, fracture and other failure forms, so that the product requirements cannot meet the process standards. Therefore, after the hot forging die is generally used for thousands of times, the mold cavity must be repaired, and the repaired die can reach or even exceed the service life before the repair. [0003] Repairing hot forging dies by surfacing we...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K9/04B23K35/308B23K35/368
Inventor 贺定勇郭泽策周正王曾洁蒋建敏王智慧
Owner BEIJING UNIV OF TECH
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