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A kind of quenching method of thin gauge steel plate

A thin-gauge, steel plate technology, applied in the field of heat treatment, can solve problems such as warping and deformation of thin-gauge steel plates, and achieve the effect of enhancing security capabilities, expanding the range of specifications and sizes, and promoting development and production.

Active Publication Date: 2021-03-26
冀南钢铁集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a quenching method for thin-gauge steel plates, which solves the problem of warping and deformation of thin-gauge steel plates during quenching, and makes the quenching flatness of thin-gauge steel plates stable and controllable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment is a further improvement of the overall quenching method:

[0034] The equipment used in the heating stage is a quenching and normalizing furnace. The quenching and normalizing furnace is a continuous roller hearth type with nitrogen in the furnace. It uses radiant tubes for heating. The radiant tubes are arranged symmetrically in two rows along the hearth of the quenching and normalizing furnace. Automatic combustion is controlled; before the steel plate enters the furnace, the surface of the steel plate is shot blasted to remove the iron scale, so as to prevent the hearth roller from being brought into the furnace to cause nodules, and at the same time ensure that the fluctuation of the furnace temperature is less than 5°C.

[0035] The medium used in the water spray cooling stage is circulating cooling water, the water temperature of the circulating cooling water is less than 35°C, and a filtering device is installed during the circulating cooling wate...

Embodiment 2

[0039] This embodiment is a further detailed operation process on the basis of Embodiment 1:

[0040] A thin-gauge steel plate with a thickness of 12 mm is selected. The equipment used in the heating stage is a quenching and normalizing furnace. The quenching and normalizing furnace is a continuous roller hearth type with nitrogen in the furnace. It uses radiant tubes for heating. The radiant tubes are arranged symmetrically in two rows along the hearth of the quenching and normalizing furnace. Automatic combustion is controlled; before the steel plate enters the furnace, the surface of the steel plate must be shot blasted to remove the iron scale, so as to prevent the hearth roller from being brought into the furnace to cause nodules; at the same time, the fluctuation of the furnace temperature is guaranteed to be less than 5°C.

[0041] The equipment used in the water spray cooling stage is a quenching machine. The working mode of the quenching machine is rolling continuous ...

Embodiment 3

[0045]This embodiment is a further detailed operation process on the basis of Embodiment 1:

[0046] A thin-gauge steel plate with a thickness of 9 mm is selected. The equipment used in the heating stage is a quenching and normalizing furnace. The quenching and normalizing furnace is a continuous roller hearth type with nitrogen in the furnace. It uses radiant tubes for heating. The radiant tubes are arranged symmetrically in two rows along the hearth of the quenching and normalizing furnace. Automatic combustion is controlled; before the steel plate enters the furnace, the surface of the steel plate must be shot blasted to remove the iron scale, so as to prevent the hearth roller from being brought into the furnace to cause nodules; at the same time, the fluctuation of the furnace temperature is guaranteed to be less than 5°C.

[0047] The equipment used in the water spray cooling stage is a quenching machine. The working mode of the quenching machine is continuous quenching ...

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Abstract

The invention relates to a quenching method of a thin steel plate. The thickness of the steel plate is 4-80 mm. The quenching method comprises the production steps of the heating stage and the water spray cooling stage, wherein a quenching normalizing furnace is adopted at the heating stage; the quenching normalizing furnace adopts a continuous roller hearth type; nitrogen is introduced into the furnace, the heating temperature of the quenching normalizing furnace is 890-910 DEG C, the quenching normalizing furnace conducts heating through upper and lower rows of radiant tubes, and the furnacetemperature fluctuation amplitude of the quenching normalizing furnace is less than 5 DEG C; at the water spray cooling stage, a quenching machine is adopted and is internally provided with pressingrollers in an up-down mode, and the quenching machine operates in a continuous rolled quenching mode; the water spray cooling stage is divided into a winter quenching mode and a summer quenching mode;a medium adopted at the water spray cooling stage belongs to circulating cooling water, and the water temperature of the circulating cooling water is less than 35 DEG C. Through the quenching method,the problem that buckling deformation occurs to the thin steel plate in the quenching process is solved, and the thin steel plate is stable and controllable in quenching straightness.

Description

technical field [0001] The invention relates to a quenching method for thin-gauge steel plates, belonging to the technical field of heat treatment. Background technique [0002] Thin-gauge quenched steel plates are mainly used in the construction machinery industry. As an important part of my country's equipment industry, construction machinery is related to the survival and development of seven major industries including construction, water conservancy, electric power, roads, mines, ports, and national defense. In recent years, with the development of large-scale, high-performance and lightweight equipment, the steel used in construction machinery has developed to today's Q890 and Q960 grades, of which high-strength steel plates Q550 and Q690 account for about 70% of the total steel plate consumption. Compared with ordinary strength steel plates, high-strength steel plates refer to the yield strength ≥ 550Mpa, that is, Q550, Q690, Q890, Q960 and other series products, among...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/46C21D1/18
CPCC21D1/18C21D9/46
Inventor 李延芝王亚兵刘文波郝华为秦彦强刘彦祥赵子荣彭红其赵博谭二庆秦利超王金星李向涛程海燕刘永
Owner 冀南钢铁集团有限公司
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