Overlay Welding Repair Technology of Large 70cr3mo Backup Roll

A back-up roll, large-scale technology, applied in welding equipment, manufacturing tools, welding media, etc., can solve the problems of difficult repair technology and high failure risk, back-up roll failure and scrapping, etc., to reduce the workload of surfacing welding, reduce cooling speed, Effect of Reducing Hardening Tendency

Active Publication Date: 2019-09-06
CITIC HEAVY INDUSTRIES CO LTD
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The back-up roll was severely damaged and scrapped, and the technical difficulty of repair and the risk of failure were very high

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Overlay Welding Repair Technology of Large 70cr3mo Backup Roll
  • Overlay Welding Repair Technology of Large 70cr3mo Backup Roll
  • Overlay Welding Repair Technology of Large 70cr3mo Backup Roll

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] The present invention will be further described below in conjunction with specific examples, so that those skilled in the art can better understand the present invention and implement it, but the given examples are not intended to limit the present invention.

[0025] The surfacing repair process of large 70Cr3Mo back-up rolls forms a large-thick surfacing repair layer after surfacing, and the surfacing repair layer follows the radial direction of the end face of the back-up roll from inside to outside in order of two layers of primer, two transition layers and several layers of work. Among them, flux I and flux II are both HJ260, and flux III is HJ107; the primer layer is formed by welding wire I and flux I to the surface of the back-up roller body, and the alloy composition of welding wire I is composed of the following elements by weight percentage: C 0.01~0.03%, Si 0.40~0.80%, Mn1.00~2.20%, Cr 0.70~1.50%, Ni 0.50~1.20%, Mo 0.40~1.00%, S≤0.025%, P≤0.03%, the balance i...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
lengthaaaaaaaaaa
widthaaaaaaaaaa
heightaaaaaaaaaa
Login to view more

Abstract

The invention discloses a large-thickness surfacing repairing layer for a large 70 Cr3Mo supporting roller and a repairing technology. The surfacing repairing layer is sequentially provided with two bottom layers, two transition layers and multiple work layers in the radial direction of the end face of the supporting roller from inside to outside. Study is conducted from the aspects of welding material selecting, surfacing technologies, surfacing process control and the like, a proper surfacing material and a rigid surfacing technology are determined so that the performance requirement and the surfacing quality of the surfacing layer can be ensured, and good technology equipment is designed and manufactured for ensuring implementation of technology measures. Finally, an abraded roller body is repaired to the original roller body size, the use performance is recovered, the service life exceeds the service life of the original roller body, and economical benefits are high. The large-thickness surfacing repairing layer can be used for the large supporting roller with the weight larger than 150 T, large-thickness surfacing layer with the thickness reaching 300 mm can be achieved, and the working layer hardness ranges from 50 HS to 60 HS; and the surfacing layer meets the ultrasonic flow detection JB / T4620 standard.

Description

technical field [0001] The invention relates to a large support roll, in particular to a surfacing repair process for a large 70Cr3Mo support roll. Background technique [0002] With the development of rolling mills in the direction of large-scale, high-speed and automation, the quality requirements for its back-up rolls are also getting higher and higher, and its market demand is also increasing. The large back-up roll is the main part of steel rolling, its quality is related to the quality and output of steel, and it is also the main consumption part of the rolling mill. With the wear and tear of each service cycle of the rolling mill, the roll diameter of the back-up roll is reduced to the limit size, or a small amount of working layer is lost due to partial peeling, and it cannot be used continuously. The direct scrapping of large back-up rolls will cause a huge waste of steel plant resources. For example, the back-up roll of Nanyang Hanye 3800 rolling mill has a weight...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/22B23K35/30B23K9/04
Inventor 王志平党朝阳李利霞赵朝辉曾令琴田治理
Owner CITIC HEAVY INDUSTRIES CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap