Water quenching and cooling method and device for ultrahigh-strength strip steel

An ultra-high-strength, cooling device technology, used in quenching devices, furnaces, heat treatment equipment, etc., can solve the problem of not considering the elimination of strip thermal stress and phase transformation stress and uniform cooling, harmful furnace conditions and environment, and poor strip shape. It is easy to correct the shape of the board, the effect is good, and the effect of improving the shape of the board is achieved.

Active Publication Date: 2011-03-30
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of this patent are: ① Elimination of strip thermal stress and phase transformation stress and uniform cooling are not considered in the spray cooling section that mainly determines the shape of the strip, resulting in poor strip shape after water quenching, which makes it difficult to pass through the strip subsequently, and Determines the poor finished strip shape; ② High-temperature organic chemical media are used in the tank, which is not conducive to subsequent processing, and is very harmful to furnace conditions and the environment

Method used

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  • Water quenching and cooling method and device for ultrahigh-strength strip steel
  • Water quenching and cooling method and device for ultrahigh-strength strip steel
  • Water quenching and cooling method and device for ultrahigh-strength strip steel

Examples

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Effect test

example 1

[0049] Example 1, the steel strip to be cooled is 980Mpa dual-phase steel with a thickness of 0.8mm (martensite content is about 30%). When the high-temperature strip steel at about 650°C after soaking and slow cooling enters the water quenching cooling tank 5 of the present invention through the entrance tension roller 2, the gas sealing device 4, etc., the water quenching nozzle 8 sprays 0.7-0.8Mpa desalination at about 60°C. Water cools the strip quickly on the surface of the high-temperature strip in operation, and at the same time, controls the elongation of the tension leveling to about 3-5%, adopts the strip speed V=200mpm=3.3m / s, 8 pairs of high-pressure water-cooled nozzles 8 and two bends and one Straightening and straightening are all invested.

[0050] In this embodiment, by controlling the parameters of high-pressure water cooling, the steel plate is cooled to 320°C, and the warm straightening process is completed after the martensitic transformation occurs, and t...

example 2

[0051] Example 2, the strip steel to be cooled is 1470Mpa martensitic steel with a thickness of 1.2mm (martensite content is about 80%). When the high-temperature strip steel at about 700°C after soaking and slow cooling enters the water quenching cooling tank 5 of the present invention through the entrance tension roller 2, the gas sealing device 4, etc., the water quenching nozzle 8 sprays 0.8-0.9Mpa desalted water at about 40°C Quickly cool the strip steel on the surface of the high-temperature strip steel in operation, and control the elongation rate of tension leveling to about 4-6% at the same time, adopt a higher belt speed V=260mpm=4.3m / s, 8 pairs of high-pressure water-cooled nozzles and two bends and one Straightening and straightening are all invested.

[0052] In this embodiment, by controlling the parameters of high-pressure water cooling, the steel plate is cooled to 290°C, and the warm straightening process is completed after the martensitic transformation occur...

example 3

[0053] Example 3, the steel strip to be cooled is 1000Mpa multi-phase steel (containing about 40% martensite and bainite) with a thickness of 1.0mm. After soaking and slow cooling, the temperature of the strip steel is about 620°C, and the structure contains about 60% ferrite, 10% bainite and 30% austenite. When the strip steel passes through the entrance tension roller 2, gas sealing device 4, etc. When entering the water quenching cooling tank 5 of the present invention, the water quenching nozzle 8 sprays 0.7-0.8Mpa desalted water at about 65°C to the surface of the high-temperature strip steel in operation to rapidly cool the strip steel, and at the same time control the elongation rate of tension leveling by about 4-7% , using tape speed V=200mpm=3.3m / s, and 8 pairs of high-pressure water-cooled nozzles and two bends and one straightening are all put into use.

[0054] In this embodiment, by controlling the parameters of high-pressure water cooling, the steel plate is coo...

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Abstract

The invention has the purpose of providing a water quenching and cooling method and device for ultrahigh-strength strip steel. The device comprises an inlet tension roll (2), an outlet tension roll (16), and a water quenching and cooling tank (5), wherein water quenching nozzles (8) and a withdrawing and straightening machine (10) are arranged in the cooling tank; the cooling tank is connected with a gas sealing device (4), a gas circulating device (6), a water circulating device (9), a water sealing device (14), a drying device (15), a strip steel operating line centering device (3) and a tension control system (17); the multiple water quenching nozzles (8) in the front section of the water quenching and cooling tank eject high-pressure water to cool the strip steel when the strip steel to be cooled enters the water quenching and cooling tank (5) through the inlet tension roll (2); the steel plate passes through the withdrawing and straightening machine (10) arranged on the lower part of the water quenching and cooling tank (5) after being cooled to 250 to 350 DEG C; the shape of the strip steel plate is straightened by a mild straightening mode; the strip steel after being cooled and straightened is transferred out of the water quenching and cooling device through the outlet tension roll (16); and the rapid cooling can be realized and the ultrahigh-strength steel plate with a good shape can be obtained at the same time.

Description

technical field [0001] This patent relates to a water quenching cooling method and device for ultra-high-strength strip steel, which belongs to the technical category of continuous heat treatment after cold rolling of steel strip materials. Background technique [0002] Protecting the environment and realizing sustainable development have become the consensus of mankind in the 21st century. With the development of the modern automobile industry, weight reduction and energy saving have become the general trend. The results of automobile lightweight research show that in order to achieve the goal of "weight reduction, energy saving, and emission reduction", the automobile industry must use a large amount of high-strength steel. The research results of the ULSAB program funded by world-renowned steel companies show that in the C-class car, a new model representing the future development direction of automotive steel, phase-transformation-strengthened dual-phase steel has accou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/52C21D1/667C22C38/28C22C38/38
Inventor 梁轩朱立新王文广阳代军赵运堂黄学启
Owner SHOUGANG CORPORATION
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