Thermal treatment process for quick cutting steel composite roll

A composite roll and high-speed steel technology, which is applied in the heat treatment process of high-speed steel composite rolls, can solve the problems of difficult heat treatment temperature and holding time, and achieve the effects of improving machinability, small hardness drop, and preventing large residual stress.

Active Publication Date: 2009-04-08
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, high-speed steel composite rolls have strict requirements on hardness and hardness un

Method used

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  • Thermal treatment process for quick cutting steel composite roll
  • Thermal treatment process for quick cutting steel composite roll
  • Thermal treatment process for quick cutting steel composite roll

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The trade mark of the high-speed steel of the present embodiment is 1.8C-5Mo-4Cr-5V, according to the heat treatment process of the high-speed steel composite roll of the present invention, the high-speed steel composite roll is heat-treated, adopting the following process parameters:

[0025] (1) Annealing

[0026] Annealing heating rate: 20°C / h; annealing heating temperature: 630°C; annealing holding time: 10h, furnace cooling.

[0027] (2) Quenching

[0028] Heating rate in the initial stage of quenching: 15°C / h; primary holding temperature: 780°C; primary holding time: 5h; secondary heating rate in quenching: 60°C / h; austenitizing temperature: 1050°C; austenitizing time : 8h; quenching cooling method: air cooling; quenching furnace temperature: 420 ℃; furnace holding time: 6h.

[0029] (3) Tempering

[0030] Heating rate for two temperings: 15°C / h; two tempering temperatures: 520°C; two tempering holding times: 15h.

[0031] The effect of this embodiment:

[00...

Embodiment 2

[0034] The trade mark of the high-speed steel of the present embodiment is 2C-6Mo-4Cr-6V, according to the heat treatment process of the high-speed steel composite roll of the present invention, the high-speed steel composite roll is heat-treated, adopting the following process parameters:

[0035] (1) Annealing

[0036] Annealing heating rate: 30°C / h; annealing heating temperature: 680°C; annealing holding time: 12h.

[0037] (2) Quenching

[0038] Heating rate in the initial stage of quenching: 20°C / h; primary holding temperature: 850°C; primary holding time: 8h; secondary heating rate in quenching: 80°C / h; austenitizing temperature: 1100°C; austenitizing time : 3h; quenching cooling method: air cooling; quenching furnace temperature: 450 ℃; furnace holding time: 5h.

[0039] (3) Tempering

[0040] Heating rate of two temperings: 25°C / h; two tempering temperatures: 530°C; two tempering holding times: 20h.

[0041] The effect of this embodiment:

[0042] Annealing hardne...

Embodiment 3

[0044] The trade mark of the high-speed steel of the present embodiment is 2.2C-W-5Mo-5Cr-6V, according to the heat treatment process of the high-speed steel composite roll of the present invention, the high-speed steel composite roll is heat-treated, adopting the following process parameters:

[0045] (1) Annealing

[0046] Annealing heating rate: 50°C / h; annealing heating temperature: 730°C; annealing holding time: 16h.

[0047] (2) Quenching

[0048] Heating rate in the initial stage of quenching: 25°C / h; primary holding temperature: 920°C; primary holding time: 12h; secondary heating rate in quenching: 100°C / h; austenitizing temperature: 1150°C; austenitizing time : 3h; quenching cooling method: air cooling + air cooling; quenching furnace temperature: 500 ℃; furnace holding time: 3h.

[0049] (3) Tempering

[0050] Heating rate for two temperings: 25°C / h; two tempering temperatures: 550°C; two tempering holding times: 25h.

[0051] The effect of this embodiment:

[0...

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Abstract

The invention belongs to the rolled steel manufacturing field, in particular to a heat treatment technology of high-speed steel composite roll, which is applied in a strip rolling mill of the rolling steel industry. The heat treatment technology is divided into three stages of annealing, quenching and tempering and is applicable to the high-speed steel composite roll, wherein, the heating speed of the annealing is 10 to 60 DEG C/h, the heating temperature of the annealing is 600 to 750 DEG C, the temperature-holding time is 8 to 20h and the annealing cooling adopt furnace cooling. The invention is characterized by low annealing hardness, being beneficial to cutting and processing, high hardness of the high-speed steel roll, good uniformity of hardness, little radial hardness after quenching and tempering and the like.

Description

technical field [0001] The invention belongs to the field of steel rolling manufacturing, and in particular relates to a heat treatment process for high-speed steel composite rolls used in strip mills in the steel rolling industry. Background technique [0002] High-speed steel has good hardenability, red hardness and wear resistance, so it replaces high-chromium cast iron and becomes the preferred material for the front-end work roll of modern advanced hot continuous rolling mills. Because of the high production efficiency and low cost of the composite casting method, it is widely used in the production of high-speed steel rolls. The heat treatment of composite high-speed steel rolls is one of the difficulties in the roll manufacturing process. If the process is unreasonable, destructive failures such as cracks and broken rolls will often occur, or lead to performance failures such as low hardness, poor hardness uniformity, and large radial hardness drop. [0003] The wor...

Claims

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Application Information

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IPC IPC(8): C21D9/38C21D1/18
Inventor 栾义坤宋男男康秀红夏立军李殿中
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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