Multi-mode energy-saving hot-rolled strip steel production line and using method thereof

A hot-rolled strip steel, energy-saving technology, applied in the direction of metal rolling, metal rolling, workpiece surface treatment equipment, etc., can solve the problems of full-line shutdown and high energy consumption per ton of steel, and achieve CO2 emission reduction, energy consumption reduction, Effect of reducing CO2 content

Active Publication Date: 2020-10-30
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem with this method is that once an accident or failure occurs in the rolling line, the entire line needs to be shut down, which will cause great losses
At present, there is no production line that can take into account both the single billet mode and the continuous rolling mode
[0005] In addition, the casting slabs of traditional hot rolling production lines are generally produced by cold charging, and the slabs need to be heated in a heating furnace for a long time before rolling, resulting in high energy consumption per ton of steel
The traditional thin slab technology,

Method used

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  • Multi-mode energy-saving hot-rolled strip steel production line and using method thereof
  • Multi-mode energy-saving hot-rolled strip steel production line and using method thereof
  • Multi-mode energy-saving hot-rolled strip steel production line and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0081] Example 1

[0082] The chemical composition and mass percentage of low carbon steel: C: 0.01%, Si: 0.52%, Mn: 0.31%, P: 0.012%, S: 0.002%, N: 0.005%, the rest is Fe and unavoidable of impurities.

[0083] Austenitic steel, using single billet rolling mode;

[0084] Production Process:

[0085] The thickness range of the continuous casting slab is 131mm, and the range of continuous casting casting speed is 6.8m / min; the first high-pressure water descaling is performed on the slab, and the pressure of the descaling water is 49MPa; the rough rolling mill 4 composed of 3 stands is used for descaling Rough rolling, the thickness of the intermediate billet outlet is 4mm; the single billet rolling mode is adopted: the billet is cut into short billets of 23 tons; in this mode, the mobile hot coil box 7 starts the lifting rod 28 of the lifting hydraulic device , so that the deflection roller 23, the forming roller 25, and the push roller 26 rise to a certain height, the lifti...

Example Embodiment

[0086] Example 2:

[0087] The chemical composition and mass percentage of low carbon steel: C: 0.07%, Si: 0.05%, Mn: 0.54%, P: 0.011%, S: 0.005%, N: 0.006%, the rest is Fe and unavoidable of impurities.

[0088] Austenitic steel, using continuous rolling mode;

[0089] Production Process:

[0090] The thickness range of the continuous casting slab is 147mm, and the continuous casting speed range is 8.1m / min; the first high-pressure water descaling is carried out on the slab, and the descaling water pressure is 52MPa; the rough rolling mill 4 composed of 3 stands is used to carry out Rough rolling, the thickness of the intermediate billet exit is 11mm; in this production mode, the mobile hot coil box 7 makes the deflection roller 23, the forming roller 25, and the pushing roller 26 fall to the other parts are on the same horizontal line ( figure 2dotted line position), the lifting hydraulic device stops running, and the strip is directly emptied through the mobile hot coi...

Example Embodiment

[0091] Example 3

[0092] The chemical composition and mass percentage of medium carbon steel: C: 0.27%, Si: 0.83%, Mn: 1.2%, P: 0.015%, S: 0.003%, N: 0.004%, the rest is Fe and unavoidable of impurities.

[0093] Ferritic steel, using single billet rolling mode;

[0094] Production Process:

[0095] The thickness range of the continuous casting slab is 152mm, and the range of continuous casting casting speed is 7.7m / min; the first high-pressure water descaling is performed on the slab, and the descaling water pressure is 50MPa; the rough rolling mill 4 composed of 2 stands is used for Rough rolling, the thickness of the intermediate billet outlet is 27mm; the single billet rolling mode is adopted: the cast billet is cut into short billets of 35 tons; in this mode, the mobile hot coil box 7 activates the lifting rod 28 of the lifting hydraulic device , so that the deflection roller 23, the forming roller 25, and the push roller 26 rise to a certain height, the lifting hydra...

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Abstract

The invention discloses a multi-mode energy-saving hot-rolled strip steel production line. The multi-mode energy-saving hot-rolled strip steel production line mainly involves a continuous casting tundish, a mold, a descaling machine 3, a roughing mill, a swing shear, an intermediate billet manipulator, a hot coil box, a rolling shear, a scrap steel removing device, a soaking pit furnace, an intermediate cooling device, a descaling machine 12, a finishing mill, a laminar cooling device, an induction soaking device, a flying shear and a recoiling machine, wherein the intermediate cooling deviceis arranged between the soaking pit furnace and the finishing mill, the scrap steel removing device is arranged behind the rolling shear, the scrap steel removing device do not communicate with the soaking pit furnace, the movable hot coil box is arranged between the intermediate billet manipulator and the rolling shear, and the induction soaking device is arranged between the laminar cooling device and the flying shear; and a using method comprises the following steps of smelting; casting into a blank; descaling for the first time; rough rolling; heating; cooling; descaling for the second time; finish rolling; cooling; electromagnetic induction heating; and coiling. The method not only has austenite rolling, but also can realize ferrite rolling, single-billet rolling and continuous rolling can be further achieved, and a product is uniform in mechanical property, low in comprehensive energy consumption and wide in thickness coverage range.

Description

technical field [0001] The invention relates to a hot-rolled steel strip production line and its use method, in particular to an energy-saving hot-rolled steel strip production line and its use method, in particular to a production line capable of rolling both austenitic steel and ferrite Both body steel and thin and thick strip steel can be produced, and a multi-mode short-flow hot-rolled strip steel production line implemented on the same production line and its use method. Background technique [0002] At present, the hot continuous rolling production lines widely used in the world mainly include conventional hot rolling production lines and thin slab continuous casting and rolling production lines. Due to the different layout of the production lines, the range of thickness of the products that can be produced by the two types of production lines is also different. [0003] Existing conventional hot rolling production lines cannot mass-produce thin-gauge hot-rolled produ...

Claims

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Application Information

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IPC IPC(8): B21B1/46B21B15/00B21B45/08
CPCB21B1/466B21B15/00B21B15/0007B21B45/08B21B2015/0057
Inventor 甘晓龙万响亮徐光赵刚刘升许耀文杨庚蔚鲍思前
Owner WUHAN UNIV OF SCI & TECH
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