Heat treatment method after forging for forged steel bearing roller used for large heavy plate mill

A post-forging heat treatment and support roll technology, which is applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve the problems of difficult preparatory heat treatment, heavy weight, and large size of support rolls for large forged steel wide and thick plates, so as to reduce the preparatory heat treatment process , reduce stress, meet the effect of roll neck hardness

Active Publication Date: 2013-05-08
SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a post-forging heat treatment method for forged steel back-up rolls for large wide and thick plate mills, which can solve the difficulty of preparatory heat treatment for large forged steel wide and thick plate back-up rolls due to their large size and heavy weight

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  • Heat treatment method after forging for forged steel bearing roller used for large heavy plate mill
  • Heat treatment method after forging for forged steel bearing roller used for large heavy plate mill
  • Heat treatment method after forging for forged steel bearing roller used for large heavy plate mill

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Embodiment Construction

[0025] Such as figure 1 Shown is an embodiment of the post-forging heat treatment method for a forged steel back-up roll for a large-scale wide and thick plate rolling mill of the present invention, which is used to perform post-forging heat treatment on a forged steel back-up roll for a rolling mill with a plate width of more than 2500 mm, including the following steps:

[0026] The first step, complete annealing;

[0027] Put the workpiece with an initial temperature of 550-650°C into the furnace and keep it warm for 30-50 hours; then raise it to 900-980°C at a heating rate of ≤80°C / h for complete annealing, and keep it warm for 30-50 hours; then heat it at ≤20°C The cooling rate per hour is reduced to 550±20°C, and the temperature is kept for 30 to 50 hours;

[0028] The second step is spheroidizing annealing;

[0029] Raise the workpiece with a temperature of 550±20°C to 640±20°C at a heating rate of ≤50°C / h and keep it warm for 30-50 hours; then raise the temperature to...

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Abstract

The present invention discloses a heat treatment method after forging for forged steel bearing roller used for large heavy plate mill, which is used for heat treatment after forging of supporting rollers used for a rolling mill with a plate width of above 2500 mm. The method comprises the following steps of: first, fully annealing; second, spheroidizing annealing; third, normalizing; and fourth, tempering. The operation method of once heat treatment after forging is used for supporting rollers used for the rolling mill with the plate width of above 2500 mm, so that the roll neck stiffness and other mechanical properties of the workpiece meet technical requirements through a manner of normalizing blast cooling. A preheat treatment process is reduced, the production cycle is shortened, and the production cost is reduced. The large plate supporting roller after heat treatment after forging can acquire pearlitic structure and sorbite structure with good mechanical properties, so that the hardness of the roll neck is up to 30-40 HS. The mechanical properties meet the technical requirements. The structure preparation for subsequent heat treatment is made.

Description

technical field [0001] The invention relates to a heat treatment method for a backup roll, in particular to a post-forging heat treatment method for a forged steel backup roll for a large wide and thick plate mill. Background technique [0002] The backup roll is an essential part of the metal rolling equipment, used to support the work roll or intermediate roll to prevent the work roll from bending and deforming during rolling, which will affect the quality of the plate shape. The quality of the backup roll directly affects the output and quality of the rolled plate. With the improvement of rolling mill performance and the progress of rolling technology, the rapid development of roll materials and manufacturing technology has been promoted. Especially in the past ten years, with the development of high-speed and automatic rolling mills, the requirements for shape control accuracy have increased, and the rolling conditions have become more and more stringent. As a result, h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/38
Inventor 张智峰陆寅松胡志强
Owner SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD
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