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Flux-cored wire for remanufacturing cold hardening resisting supporting roll through bead welding

A technology of flux-cored welding wire and cold work hardening, which is applied in the field of surfacing welding repair. It can solve the problems affecting the surface quality of rolled steel, the surface wear and peeling of work rolls, etc., so as to prevent cold work hardening, improve strength and corrosion resistance high resistance to cracking

Inactive Publication Date: 2016-02-03
ZHENJIANG HUAYING ROLLER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Excessive hardness of the back-up rolls will damage the work rolls, causing the surface of the work rolls to be severely worn or even peeled off, thereby affecting the surface quality of the rolled steel, and even causing accidents such as steel jamming, which seriously affects the normal steel rolling production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take C0.35kg, Si0.5kg, Mn2.0kg, Cr8.0kg, Ni0.8kg, Mo1.5kg, V0.3kg, La 2 o 3 1.9kg, Nb0.15kg, Fe84.5kg, first heat the above-mentioned ferrosilicon powder at 720°C for 1 hour, heat the above-mentioned ferrochromium powder at 550°C for 1 hour, and heat the above-mentioned ferromanganese powder at 300°C for 1 hour Put the various raw materials of the above-mentioned flux core into the mixing machine and mix for 24 hours, then fill the H08A strip steel with the above-mentioned uniformly mixed raw materials, and the flux core powder accounts for 25% of the welding wire material weight. Rolling was carried out to draw a flux-cored wire of φ4mm, and the flux-cored wire was dried at 100°C. Overlay welding is carried out on the Cr5 support roller. After overlay welding repair, the large support roller is tempered at 560°C for 48 hours, and the surface hardness of the tempered support roller is HSD55; after working for 10 days, the surface hardness of the support roller is HSD61...

Embodiment 2

[0026] Take C0.37kg, Si0.8kg, Mn2.5kg, Cr10.0kg, Ni1.0kg, Mo1.8kg, V0.4kg, La 2 o 3 1.6kg, Nb0.10kg, Fe81.43kg, first, heat the above-mentioned ferrosilicon powder at 730°C for 1 hour, heat the above-mentioned ferrochrome powder at 580°C for 1 hour, and heat the above-mentioned ferromanganese powder at 320°C for 1 hour Put the various raw materials of the above-mentioned flux core into the mixing machine and mix for 24 hours, then fill the H08A strip steel with the above-mentioned uniformly mixed raw materials, and the flux core powder accounts for 35% of the welding wire material weight. Rolling was carried out to draw a flux-cored wire of φ4mm, and the flux-cored wire was dried at 150°C. Overlay welding is carried out on the Cr5 support roller, and the large support roller repaired by surfacing is tempered at 560°C for 44 hours, and the surface hardness of the tempered support roller is HSD60; after 10 days of work, the surface hardness of the support roller is HSD65, preve...

Embodiment 3

[0028] Take C0.40kg, Si1.0kg, Mn3.0kg, Cr12.0kg, Ni1.2kg, Mo2.0kg, V0.6kg, La 2 o 3 1.3kg, Nb0.05kg, Fe78.75kg, first heat the above-mentioned ferrosilicon powder at 750°C for 1 hour, heat the above-mentioned ferrochromium powder at 600°C for 1 hour, and heat the above-mentioned ferromanganese powder at 350°C for 1 hour ; Put the various raw materials of the above-mentioned flux core into the mixing machine and mix for 24 hours, then fill the H08A strip steel with the above-mentioned uniformly mixed raw materials, and the flux core powder accounts for 40% of the welding wire material weight. Rolling was carried out to draw a flux-cored wire of φ4mm, and the flux-cored wire was dried at 200°C. Overlay welding is carried out on the Cr5 support roller, and the large support roller repaired by surfacing is tempered at 560°C for 40 hours, and the surface hardness of the tempered support roller is HSD65; after 10 days of work, the surface hardness of the support roller is HSD68, pr...

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Abstract

The invention provides a flux-cored wire for remanufacturing a cold hardening resisting supporting roll through bead welding. A flux core of the flux-cored wire comprises, by mass, 0.35-0.40% of C, 0.5-1.0% of Si, 2.0-3.0% of Mn, 8.0-12.0% of Cr, 0.8-1.2% of Ni, 1.5-2.0% of Mo, 0.3-0.6% of V, 0.05-0.15% of Nb, 1.3-1.9% of La2O3, and the balance Fe. Tempering treatment is conducted on the supporting roll subjected to bead welding and is kept at the temperature of 560 DEG C for 40-48 hours. The flux-cored wire is used for conducting bead welding remanufacturing on the large supporting roll, so that the toughness of metal of a bead weld layer is improved, the high anti-crack property of the supporting roll is guaranteed, the strength and corrosion resistance of the metal of the bead weld layer are further improved, and the cold hardening phenomenon generated in the metal of the bead weld layer is prevented.

Description

technical field [0001] The invention relates to a surfacing welding repair technology, in particular to a flux-cored welding wire. Background technique [0002] As a key component in steel rolling production, backup rolls support the work rolls and ensure that the work rolls roll out qualified steel. Back-up rolls are generally divided into hot-rolled back-up rolls and cold-rolled back-up rolls, especially cold-rolled back-up rolls, whose service conditions are more severe. Therefore, the quality of backup rolls not only directly affects the service life of work rolls, but also indirectly affects the quality and production efficiency of rolled steel. [0003] The back-up roller is subjected to mechanical load, thermal load and friction load during operation. After working for a period of time, the surface of the back-up roller is scrapped due to contact fatigue damage and transitional wear. [0004] At present, the chemical composition of flux-cored welding wire flux core ...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/40C22C38/58C21D1/18C21D9/38
CPCB23K35/3086B23K35/40C21D1/18C21D9/38C22C38/005C22C38/04C22C38/12C22C38/44C22C38/46C22C38/48C22C38/58
Inventor 杨庆祥包华玉
Owner ZHENJIANG HUAYING ROLLER CO LTD
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