Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Heat treatment method for large high-speed steel cold-rolled work roll

A technology of cold-rolled work rolls and heat treatment methods, which is applied in the field of heat treatment, can solve the problems of restricting the production and popularization of large-scale high-speed steel cold rolls, affecting the safe production of large-scale forged high-speed steel rolls, and difficult to obtain high roll body hardness. The effect of avoiding destructive failure, outstanding roughness retention ability, and satisfactory surface quality

Active Publication Date: 2016-04-13
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
View PDF7 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Heat treatment is a difficult problem in the production of large-scale forged high-speed steel cold-rolled work rolls. Due to the high quenching temperature, interruption of the quenching process and heat treatment cracks were once a major hidden danger affecting the safe production of large-scale forged high-speed steel rolls. High hardness of the roll body, these two factors restrict the production and application of large high-speed steel cold rolls

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
  • Heat treatment method for large high-speed steel cold-rolled work roll

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A heat treatment method for large-scale high-speed steel cold-rolled work rolls, the requirements of the work rolls are as follows:

[0025] Roll diameter:

[0026] Roll body hardness requirement: 90~95HSD;

[0027] Working layer thickness requirement: ≥33mm;

[0028] Roll material: forged high-speed steel, using electric furnace + ladle refining + electroslag remelting to produce steel ingots, the steel ingots are heated and forged according to process requirements to make roll forging blanks.

[0029] The heat treatment method includes preliminary treatment, preheat treatment and final heat treatment, and the steps are as follows:

[0030] 1. Preparatory treatment: Preliminary treatment is carried out on the high-speed steel cold-roll forging billet according to the requirements, and it is machined to the required size according to the drawing requirements;

[0031] 2. Preheating treatment:

[0032] A. Overall low-temperature preheating: Preheat the pre-treated ...

Embodiment 2

[0040] The difference between this embodiment and Embodiment 1 is: the preheating and holding temperature in step A is 350°C, and the holding time is 20h.

Embodiment 3

[0042] The difference between this embodiment and Embodiment 1 is: in step B, the temperature of the roll exiting the induction coil is 750°C; the roll continues to move upwards, and air cools for 20 minutes after exiting the induction coil.

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
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a heat treatment method for a large high-speed steel cold-rolled work roll, and belongs to the technical field of heat treatment. The heat treatment method comprises pretreatment, preheat treatment and finish heat treatment. The preheat treatment comprises integral low-temperature preheat and continuous induction heating preheat. During continuous induction heating preheat, the temperature of the roll when the roll gets out of an induction coil is required to be 600-750 DEG C, the roll continues to move upwards, air cooling is conducted for 15-35 min after the roll gets out of the induction coil, and finish heat treatment is conducted. The heat treatment method is different from a conventional continuous induction quenching manner, the roll body continuous induction preheat treatment step is added on the basis of conventional integral preheat, and the heat treatment success rate of the large high-speed steel roll can be greatly increased. Meanwhile, cold treatment is added after first-time tempering of the roll is conducted, a roll body has hardness of 90 HSD or more after finish heat treatment of the high-speed steel cold-rolled work roll is conducted, and the technology requirement of a cold-rolled steel plate can be completely met.

Description

technical field [0001] The invention relates to a heat treatment method for a large-scale forged high-speed steel cold-rolled work roll, and belongs to the technical field of heat treatment. Background technique [0002] In order to realize the rolling of high-precision cold-rolled strip steel and improve the production efficiency of the rolling mill, the rolling speed of the rolling mill is getting faster and faster, the thickness of the rolled strip is getting thinner, and the deformation resistance of the rolled material is getting bigger and bigger. At present, the mainstream materials of cold-rolled work rolls are 3%Cr and 5%Cr. After the heat treatment of the workpiece, the roll body can obtain a high hardness above 90HSD, which can meet the surface quality requirements of cold-rolled steel sheets. However, due to the characteristics of the material itself, this high Hardness can only be guaranteed at a low tempering temperature, usually below 160°C. [0003] However,...

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 Applications(China)
IPC IPC(8): C21D9/38C21D1/18C21D1/42
CPCC21D1/18C21D1/42C21D9/38Y02P10/25
Inventor 杨昱东刘娣苗金平苏军新崔聪聪朱学刚闫红霞
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com