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
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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

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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.

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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

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Application Information

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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
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