Flux-cored wire for repair cold-rolling support roll operational layer and preparation method thereof

A technology of working layer and support roll, which is applied in welding equipment, metal processing equipment, welding medium, etc., can solve the problems of toughness not meeting the requirements, poor fatigue resistance, falling blocks and cracks, etc., so that it is not easy to fall blocks and cracks , Good fatigue resistance, good crack resistance

Inactive Publication Date: 2009-03-25
PANGANG GROUP RESEARCH INSTITUTE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cold-rolled back-up rolls are subject to high rolling pressure and fatigue stress during use, requiring good hardness, strength and fatigue resistance. Currently, the existing working welding wires that can be used for cold-rolled back-up roll repair The hardness can meet the requirements, but the toughness cannot meet the requirements, the fatigue resistance is poor during use, and it is easy to produce blocks and cracks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Ferromanganese, ferrochrome, ferromolybdenum, ferrovanadium, ferroniobium, ferrotungsten, ferrotitanium, metallic nickel, ferrosilicon, rare earth, and iron powder are taken according to a certain proportion, and evenly mixed and packed on the tube wire sheathed steel belt. Tubular flux-cored wire, whose composition is controlled at: C 0.30%, Si0.50%, Mn 0.70%, Cr 2.5%, Ni 0.4%, Mo 0.5%, V 0.30%, Nb 0.03%, Ti 0.01%, W 0.80% , Re 0.05%, S ≤ 0.035%, P ≤ 0.035%, the balance is Fe, all of the above are weight percentages, and the sum of percentages is 100%. Put the powder mixture in the above ratio into the steel belt trough, and then draw it into a Φ4.0mm welding wire, which is used for the submerged arc welding machine to surfacing the working layer of the cold rolling back-up roll.

[0023] Using this welding wire for surfacing, the hardness of the surfacing layer metal is greater than HRC46. The hardness and toughness can meet the requirements, and the anti-fatigue abi...

Embodiment 2

[0025] Ferromanganese, ferrochrome, ferromolybdenum, ferrovanadium, ferroniobium, ferrotungsten, ferrotitanium, ferronickel, ferrosilicon, rare earth, and iron powder are taken in a certain proportion, and evenly mixed and packed on the tube wire sheathed steel belt. Tubular flux-cored wire, whose composition is controlled at: C 0.35%, Si0.75%, Mn 0.80%, Cr 3.0%, Ni 0.70%, Mo 1.0%, V 0.40%, Nb 0.06%, Ti 0.015%, W 1.3% , Re 0.25%, S ≤ 0.035%, P ≤ 0.035%, the balance is Fe, all of the above are weight percentages, and the sum of the percentages is 100%. Put the powder mixture in the above ratio into the steel belt trough, and then draw it into a Φ4.0mm welding wire, which is used for the submerged arc welding machine to surfacing the working layer of the cold rolling back-up roll.

[0026] Using this welding wire for surfacing, the hardness of the surfacing layer metal is greater than HRC47. The hardness and toughness can meet the requirements, and the anti-fatigue ability is g...

Embodiment 3

[0028] Ferromanganese, ferrochrome, ferromolybdenum, ferrovanadium, ferroniobium, ferrotungsten, ferrotitanium, ferronickel, ferrosilicon, rare earth, and iron powder are taken in a certain proportion, and evenly mixed and packed on the tube wire sheathed steel belt. Tubular flux-cored wire, whose composition is controlled at: C 0.40%, Si1.0%, Mn 1.0%, Cr 3.5%, Ni 1.0%, Mo 1.7%, V 0.60%, Nb 0.10%, Ti 0.025%, W 1.9% , Re 0.50%, S ≤ 0.035%, P ≤ 0.035%, the balance is Fe, all of the above are weight percentages, and the sum of the percentages is 100%. Put the powder mixture in the above ratio into the steel belt trough, and then draw it into a Φ4.0mm welding wire, which is used for the submerged arc welding machine to surfacing the working layer of the cold rolling back-up roll.

[0029] Using this welding wire for surfacing, the hardness of the surfacing layer metal is greater than HRC48. The hardness and toughness can meet the requirements, and the anti-fatigue ability is good...

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Abstract

The invention belongs to the welding material field, in particular relates to a flux-cored welding wire used in the restoration of the operation layer of a cold roll bearing roller and a preparation method thereof. The technical problem to be solved is to provide a welding material used for repairing the operation layer of a cold roll bearing roller. The weld overlay metal is of high hardness, and good wear resistance, crack resistance and anti-fatigue and anti-destructiveness performance. The core of the flux-cored welding wire is composed of the following component by weight percentage: C 0.30-0.40%, Si 0.50-1.0%, Mn 0.70-1.0%, Cr 2.5-3.5%, Ni 0.4-1.0%, Mo 0.5-1.7%, V 0.30-0.60%, Nb 0.03-0.10%, Ti 0.01-0.025%, W 0.80-1.9%, Re 0.05- 0.50%, S <= 0.035%, P<=0.035%, and a remnant amount of Fe. The application of the welding wire in the cold roll bearing roller welding achieves the requirements of the weld surfacing restoration.

Description

technical field [0001] The invention belongs to the field of welding materials, and in particular relates to a flux-cored welding wire for repairing the working layer of a cold-rolled back-up roll and a preparation method thereof. Background technique [0002] The cold-rolled backup roll is a key part of the parts required for the production of cold-rolled steel plates. It bears a large alternating stress during work, and the hardness of the roll body reaches HRC46-50. It also requires better anti-stripping ability. Manufacturers generally use high-carbon low-alloy steel such as 9Cr3Mo through forging and complicated heat treatment processes, which are expensive. The annual consumption of cold-rolled back-up rolls in the country is very large, and because of the difficulty of repairing, they are almost scrapped without repairing, resulting in huge economic losses. [0003] The repair of cold-rolled back-up rolls mainly adopts surfacing technology, which includes pre-welding...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B21C1/00
Inventor 林剑东何藩黄平陈建平周三保熊旭姜庆波
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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