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Hot-rolled board strip production line laminar cooling method

A laminar cooling, production line technology, applied in metal rolling, metal rolling, metal processing equipment and other directions, can solve the problems of poor cooling, poor targeting, long cycle, etc., to achieve good cooling, good control effect, The effect of stable improvement of comprehensive quality

Active Publication Date: 2013-09-11
CHONGQING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of control strategy is either one or the other, because there is no further subdivision, so the pertinence is not strong, the cooling performance is poor, the required cycle is very long, the control effect is often not ideal, and the preliminary performance pass rate is about 85.80%

Method used

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  • Hot-rolled board strip production line laminar cooling method
  • Hot-rolled board strip production line laminar cooling method
  • Hot-rolled board strip production line laminar cooling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A batch of strips (steel type: Q235B(c)) with a thickness of 2.5-4mm and a temperature of 875-890°C passed through the laminar cooling zone at a speed of 8m / s. The spray pressure of the nozzle above the laminar cooling area is 0.068MPa, and the total flow of spray water above is 5415m 3 / h; the water spray pressure of the nozzle below the laminar cooling area is 0.068MPa, and the total flow of water spray below is 6507.5m 3 / h. The spray pressure of the nozzles on both sides of the laminar cooling area is 0.95MPa, and the total flow rate of the side spray is 364.8m 3 / h. The jet pressure of the jet nozzle is 1MPa, and the total jet flow is 0.4nm 3 / h.

[0036] After cooling, the temperature sent to the coiler is 625-650°C, and its mechanical properties are as follows: Figure 2-5 As shown, from the histogram Figure 2-5 From the above, it conforms to the normal distribution, the difference between the sample value and the average value is small, the single value dia...

Embodiment 2

[0038] Roll a batch of strips (steel type: Q235B(c)) with a thickness of 4-6 mm and a temperature of 850-870 °C in the finishing rolling mill at a speed of 9 m / s through the laminar cooling zone; The water spray pressure of the nozzle is 0.07MPa, and the total flow of water sprayed above is 5700m 3 / h; the water spray pressure of the nozzle below the laminar cooling area is 0.07MPa, and the total flow of water spray below is 6850m 3 / h; the spray pressure of the nozzles on both sides of the laminar cooling area is 1MPa, and the total flow of side spray is 384m 3 / h; the jet pressure of the jet nozzle is 1MPa, and the total jet flow rate is 0.4nm 3 / h.

[0039] After cooling, the temperature sent to the coiler is 645-662°C, and its mechanical properties are as follows: Figure 6-9 As shown, from the histogram Figure 6-9 From the above, it conforms to the normal distribution, the difference between the sample value and the average value is small, the single value diagram of...

Embodiment 3

[0041] Roll a batch of strips (steel type: Q235B(c)) with a thickness of 6-8mm and a temperature of 870-890°C in the finishing rolling mill through the laminar cooling zone at a speed of 10m / s; The water spray pressure of the nozzle is 0.0735MPa, and the total flow of water sprayed above is 5985m 3 / h; the water spray pressure of the nozzle below the laminar cooling area is 0.0735MPa, and the total flow of water spray below is 7192.5m 3 / h; the water spray pressure of the nozzles on both sides of the laminar cooling area is 1.05MPa, and the total flow rate of the side spray is 403.2m 3 / h; the jet pressure of the jet nozzle is 1MPa, and the total jet flow rate is 0.4nm 3 / h.

[0042] After cooling, the temperature sent to the coiler is 655-680 °C, and its mechanical properties are as follows: Figure 10-13 As shown, from the histogram Figure 10-13 From the above, it conforms to the normal distribution, the difference between the sample value and the average value is small...

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Abstract

The invention discloses a hot-rolled board strip production line laminar cooling method. A laminar cooling area between a finishing mill set and a coiling machine is divided into a rapid cooling section I, a coarse adjusting section, an air cooling section, a rapid cooling section II and a fine adjusting section. A board strip with the thickness of 2.5-12mm and the temperature of 850-900 DEG C is made to pass through the laminar cooling area with the speed of 8-10m / s. Water spraying pressure of a nozzle above the laminar cooling area is 0.068Mpa to 0.0735MPa, water spraying pressure of a nozzle below the laminar cooling area is 0.068MPa to 0.0735MPa, water spraying pressure of nozzles at the two sides of the laminar cooling area is 0.95Mpa to 1.05MPa, and air jetting pressure of an air jetting nozzle is 1MPa. When strip steel is conveyed on the laminar cooling area, the strip steel is cooled through the nozzles arranged above, below and at the two sides of the laminar cooling area. Cooling performance is good, a controlling effect is better, qualified performance of steel coil products is ensured, comprehensive quality of steel coils is stably improved, and refining and rolling production cost of the steel coil products is greatly reduced.

Description

technical field [0001] The invention relates to a cooling method, in particular to a laminar flow cooling method for a hot-rolled strip production line. Background technique [0002] After the strip steel of the hot rolling production line is rolled out of the finishing mill, it must enter the coiler for coiling at the specified coiling temperature, so as to ensure its good microstructure and mechanical properties. Different cooling modes and coiling temperatures are used. Controlling the coiling temperature of the strip steel within the range determined by the internal metallographic structure of the steel is a key control measure for the quality of the strip steel. The purpose of coiling temperature control is to quickly cool the strip steel in different conditions (temperature, thickness, speed) from a relatively high final rolling temperature to the required coiling temperature through the dynamic adjustment of the length of the laminar cooling water section, so that T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B45/02
Inventor 张卿徐朝辉詹铁兵罗潇
Owner CHONGQING IRON & STEEL CO LTD
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