Intermediate billet inclined jet flow cooling and shape control method

A technology of plate shape control and jet flow, applied in the field of steel rolling process, can solve the problem of limited cooling capacity of aerosol mist, and achieve the effect of large adjustment range, improved heat exchange efficiency and flexible layout.

Active Publication Date: 2017-01-11
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Patent Publication No. CN 101642780A discloses an intermediate billet cooling system and cooling control process. An air mist cooling device body is installed between the roughing mill and the finishing mill, and the intermediate billet is cooled by air mist t

Method used

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  • Intermediate billet inclined jet flow cooling and shape control method

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Embodiment 1

[0020] The size of the Q550-ZB-1 billet in this embodiment is 220mm*2150mm*2510mm, the size of the intermediate billet is 72.11mm*2666mm*6500mm, the size of the rolled steel plate is 40.25mm*2617mm*11393mm, and the method of cooling the intermediate billet with an inclined jet stream and controlling the shape of the plate is specific for:

[0021](1) The billet is discharged from the heating furnace 1, and the tapping temperature is 1199°C. After being descaled by the descaling box 2, it enters the rolling mill 5 for rough rolling. Adjust the line speed of the upper work roll to 105%-110% of the line speed of the lower work roll, and adjust the line speed of the upper work roll to 90%-95% of the line speed of the lower work roll to make the intermediate blank The shape is straight. The PDI (Primary Data Input) information of the intermediate billet (including the ID number of the intermediate billet, the steel type of the billet, the thickness of the intermediate billet, the ...

Embodiment 2

[0027] The size of the X70MO billet in this embodiment is 320mm*2100mm*3585mm, the size of the intermediate billet is 125mm*2160mm*9400mm, and the size of the rolled steel plate is 41.69mm*2152mm*28090mm.

[0028] (1) The billet is discharged from the heating furnace 1, and the tapping temperature is 1186°C. After being descaled by the descaling box 2, it enters the rolling mill 5 for rough rolling. Adjust the line speed of the upper work roll to 105%-110% of the line speed of the lower work roll, and adjust the line speed of the upper work roll to 90%-95% of the line speed of the lower work roll to make the intermediate blank The shape is straight. The PDI (Primary Data Input) information of the intermediate billet (including the ID number of the intermediate billet, the steel type of the billet, the thickness of the intermediate billet, the width of the intermediate billet, the length of the intermediate billet, the cooling speed, the final cooling temperature, etc.) 5 The ...

Embodiment 3

[0034] The size of the X70MO billet in this embodiment is 320mm*2100mm*3586mm, the size of the intermediate billet is 125mm*2160mm*9402mm, the size of the rolled steel plate is 41.72mm*2152mm*27869mm, the method of cooling the intermediate billet with inclined jet flow and controlling the plate shape is as follows:

[0035] (1) The billet is discharged from the heating furnace 1, and the tapping temperature is 1145°C. After being descaled by the descaling box 2, it enters the rolling mill 5 for rough rolling. Adjust the line speed of the upper work roll to 105%-110% of the line speed of the lower work roll, and adjust the line speed of the upper work roll to 90%-95% of the line speed of the lower work roll to make the intermediate blank The shape is straight. The PDI (Primary Data Input) information of the intermediate billet (including the ID number of the intermediate billet, the steel type of the billet, the thickness of the intermediate billet, the width of the intermediat...

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Abstract

The invention discloses an intermediate billet inclined jet flow cooling and shape control method. The billet with the tapping temperature being 1140-1200 DEG C is descaled by a descaling box and enters a rolling mill for rough rolling; the last three-pass speed loading balance coefficient of rough rolling of a rolled piece is adjusted to enable the strip shape of the intermediate billet with the thickness of 50-250 mm to be flat and straight; after the rough rolling, the intermediate billet enters an inclined jet flow cooling device through a pre-straightener for one-off through type cooling or forward and reverse reciprocating type cooling; gap jet nozzle and high-density jet nozzle typed cooling collectors are continuously opened or opened at intervals by taking 'forward ejection and reverse ejection' or 'forward ejection and forward ejection and reverse ejection' as units; setting of flow rates of a forward upward collector and a reverse upward collector gives consideration to the heat exchanging efficiency of cooling water and the intermediate billet, flow direction of scouring water and residual water, and the cooling strip shape of the intermediate billet. With adoption of the method, the temperature waiting time of the intermediate billet is shortened, the rolling efficiency is improved, and the structure property of variety steel is improved.

Description

technical field [0001] The invention belongs to the technical field of steel rolling technology, and relates to a method for cooling and shape control, in particular to a method for cooling an intermediate billet with an inclined jet flow and controlling the shape. Background technique [0002] At present, domestic single-frame or double-frame medium and heavy plate production lines have fewer cooling devices for intermediate blanks. In terms of single-stand production line, the intermediate billet is cooled by the laminar flow cooling device after the rolling mill. For a two-stand production line, the intermediate billet is cooled by a vapor-mist cooling device arranged between the roughing mill and the finishing mill. The laminar flow cooling or vapor mist cooling device adopts U-shaped tube or straight tube nozzle for cooling, and the upper and lower headers are asymmetrically cooled, the heat exchange efficiency is not high, and the cooling uniformity is poor. [0003]...

Claims

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Application Information

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IPC IPC(8): B21B45/02B21B37/44B21B37/74
CPCB21B37/44B21B37/74B21B45/0218
Inventor 郑东升廖仕军郭怀兵王玉姝宋斌
Owner NANJING IRON & STEEL CO LTD
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