Overlaying-combining-remanufacturing substrate material for Cr4 and Cr5 series of hot rolling work rolls and back-up rolls

A technology of working rolls and backup rolls, which is applied in the direction of welding/cutting media/materials, manufacturing tools, welding media, etc., can solve the problems of micro cracks and layered tearing off of the original roll and surfacing materials, and achieve improved crack resistance Diffusion ability, no surfacing defects, good bonding effect

Inactive Publication Date: 2012-07-04
CHINA JINGYE ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main problem in the current surfacing and remanufacturing roll technology is that the original roll and the surfacing material are prone to micro-cracks and layered tearing defects d

Method used

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  • Overlaying-combining-remanufacturing substrate material for Cr4 and Cr5 series of hot rolling work rolls and back-up rolls
  • Overlaying-combining-remanufacturing substrate material for Cr4 and Cr5 series of hot rolling work rolls and back-up rolls
  • Overlaying-combining-remanufacturing substrate material for Cr4 and Cr5 series of hot rolling work rolls and back-up rolls

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0066] Embodiment 1 Preparation of primer material

[0067] (1) The composition of Cr4 and Cr5 series hot-rolled work rolls and back-up rolls for composite remanufacturing primer materials 1 and 2 are shown in Table 2:

[0068] Table 2 Mass percentage of deposited metal (wt%)

[0069]

[0070] (2) The preparation process of materials 1 and 2 is as follows:

[0071] A. According to the ratio shown in Table 2, the powder of each component is mixed uniformly in the powder mixer;

[0072] B. Slitting the cold-rolled steel strip into a 12-16mm wide steel strip with a slitting machine, rolling the steel strip into a U-shaped cross-section on the wire rolling machine, and filling the mixed U-shaped groove of the steel strip Primer material powder, and then roll the U-shaped steel strip into a Φ3-5mm welding wire blank tube;

[0073] C. Use a multi-connected linear wire drawing machine to draw the welding wire blank tube to the finished product size Φ2.4~4.0mm, and then use a la...

Example Embodiment

[0074] Example 2 Surfacing repair and performance test of support roller

[0075] (1) Support roller surfacing repair

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PUM

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Abstract

The invention relates to an overlaying-combining-remanufacturing substrate material for Cr4 and Cr5 series of hot rolling work rolls and back-up rolls. The material comprises the following ingredients by proportioning: 0.02-0.10% of C, 0.8-1.8% of Mn, 0.2-0.5% of Si, 4.0-8.0% of Ni, 0.4-1.4% of Ti, 0.1-0.2% of V and the balance of Fe. The substrate material can be well combined with a roll surface and has excellent physical and chemical properties, and can effectively overcome the defects of small cracks and shedding caused by lamellar tearing in the using process of original rolls and overlaying materials.

Description

technical field [0001] The invention relates to the technical field of surfacing welding, in particular to a base material for remanufacturing of hot-rolled work rolls and support rolls by surfacing welding. Background technique [0002] Large-scale metallurgical rolls are the main spare parts in steel rolling production. During the working process, the rolls roll high-temperature metal plates at about 1000 °C. The surface of the rolls is cooled by air mist cooling, and the interior is cooled by inner circumferential water. Surface defects such as cracks and peeling appear on the work roll, causing the roll to be scrapped. Usually when the roll is scrapped, its metal loss is only about 15% of the total weight. At present, most of the scrapped work rolls and back-up rolls in China are used as raw materials for smelting, resulting in a huge waste of resources and energy. In order to meet the needs of the market, remanufacturing the existing large metallurgical rolls is one o...

Claims

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Application Information

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IPC IPC(8): B23K9/04B23K35/24
Inventor 王清宝眭向荣刘景凤白波王立志汤春天肖静沈亚威
Owner CHINA JINGYE ENG
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