Method and device for testing heat exchange coefficients of steel plate with different water film thickness

A heat transfer coefficient and water film thickness technology, applied in the field of hot rolling cooling, can solve the problem of not testing the heat transfer coefficient

Inactive Publication Date: 2012-09-12
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
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Problems solved by technology

[0007] Chinese patent CN 201464402U discloses a special steel plate sample for controlling the cooling surface heat transfer coefficient test. The main invention lies in t

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  • Method and device for testing heat exchange coefficients of steel plate with different water film thickness
  • Method and device for testing heat exchange coefficients of steel plate with different water film thickness
  • Method and device for testing heat exchange coefficients of steel plate with different water film thickness

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Embodiment Construction

[0067] see Figure 1 to Figure 5 In the present invention, a cylindrical steel sample with a thickness of 145 mm and a radius of 20 mm is used to drill embedded couple holes 4 at the positions of 10 mm (a1), 30 mm (a2), and 50 mm (a3) ​​from the surface, and three K-type thermoelectric tubes are embedded. Couple 5, thermocouple temperature range 0 ~ 1000 ℃, sampling frequency is 5. After the steel plate was heated to 900°C, it was taken out and sprayed with water for cooling, and the temperature data of the cooling process was recorded. The temperature acquisition device uses a multi-channel temperature recorder 8 and a data memory 9 .

[0068] The density of the steel sample is 7850kg / m 3 , the specific heat is 673.9J / (kg*K), the thermal conductivity is 31J / (s*m*K), and the water temperature Tw is 25°C. The height h of the water film cofferdam is 10mm, the length B of the water retaining plate is 50mm, and the thickness of the insulation layer b is 40mm.

[0069] At the b...

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Abstract

The invention provides a method and a device for testing heat exchange coefficients of steel plates with different water film thicknesses. A cylindrical water film cofferdam is welded on the surface of a cylindrical steel plate, the height h of a cofferdam is equal to the tested thickness of the water film; three temperature measuring points are set in a direction perpendicular to cylindrical steel plate at a distance interval x, holes are drilled on the side face of the cylindrical steel plate at positions which are x/2, x3/2 and x5/ away from the upper end face of the cylindrical steel plate, thermocouples are then placed in the holes, and the cold ends of the thermocouples are connected to a multi-channel data acquisition device; during experiment, a steel sample is placed in a heating furnace, then the data acquisition device is started to acquire the temperature; when the steel plate reaches an initial cooling temperature, the steel sample is taken out and placed in a heat-insulation tank which is placed under a spray nozzle, later the spray nozzle is opened to spray water onto the water film cofferdam and thus, and a water film is covered on the surface of the steel plate; and when the steel plate reaches a final cooling temperature, the temperature acquisition is stopped, and thus, the steel plate cooling curve T (t) based on different positions at the upper end face of the cylindrical steel plate is obtained. Therefore, the method and the device can test the heat exchange coefficient of the surface of the steel plates under a condition of different thicknesses of water films.

Description

technical field [0001] The invention belongs to the field of hot rolling cooling, and in particular relates to a method and device for testing the heat transfer coefficient of steel plates with different water film thicknesses, which are used for laminar flow cooling of hot rolling or quenching and cooling of thick plates under the action of surface water films of different thicknesses on hot steel plates The heat transfer coefficient test. Background technique [0002] Cooling technology is widely used in the field of iron and steel production, such as air cooling and furnace cooling in the heat treatment process, laminar flow cooling in the hot rolling field, quenching cooling in thick plate production, etc. According to the needs of the product, cooling methods with different cooling capacities can be obtained. steel properties. [0003] For simple cooling methods such as air cooling and furnace cooling, the heat transfer coefficient can obtain more accurate calculation ...

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Application Information

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IPC IPC(8): G01N25/20
Inventor 张庆峰王笑波焦四海吴建峰刘晔
Owner BAOSHAN IRON & STEEL CO LTD
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