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Temperature control method for rolled strip steel in ferrite area

A temperature control method and ferrite technology, applied in the direction of temperature control, metal rolling, etc., can solve the problems of difficult to arrange cooling equipment, long time for air cooling, long cooling swing time, etc. Effect of rolling pressure, improving strip structure and mechanical properties

Pending Publication Date: 2021-12-24
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when ferrite rolling is carried out on the existing traditional hot strip hot rolling production line, it is difficult to arrange due to the very short distance between the heat preservation cover or hot coil box and the shearing shears on the traditional hot strip hot rolling production line. The cooling equipment with a slightly longer cooling length makes the intermediate billet need to be air-cooled for a long time between the heat preservation cover or the hot coil box and the cutting shears, so that the strip billet can reach a suitable temperature before entering the finishing mill
However, when air cooling is used for cooling, there are defects such as inaccurate temperature control before finish rolling, high energy consumption, and large investment; in addition, the thicker intermediate billet is likely to cause uneven temperature of the strip billet, and the air cooling takes a long time (that is, rough rolling The cooling swing time between finishing rolling is too long), which also reduces the production efficiency

Method used

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  • Temperature control method for rolled strip steel in ferrite area
  • Temperature control method for rolled strip steel in ferrite area
  • Temperature control method for rolled strip steel in ferrite area

Examples

Experimental program
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Effect test

Embodiment 1

[0026] like figure 1 As shown, the embodiment is selected for the IF steel (ultra-low carbon) slab, the ferritic region rolling, the slab component is: c ≤ 0.01%, Si ≤ 0.03%, Mn ≤ 0.2%, P ≤ 0.02 by weight percent. %, S ≤ 0.015%, Al ≤ 0.06%, N ≤ 0.004%, Ti ≤ 0.12%, margin is Fe. In the cooling rate of 1 to 3 ° C / s, its ferrite phase change termination temperature AC 3f 860 ° C, Austenite AC 3 The temperature is 910 ° C; the annealing re-crystallization temperature after cold rolling is over 660 ° C. The stable rolling speed of the thick roller is 5.5m / s, the rough rolling mill is 1.3m / s, and the roll line speed of the front rough rolling mill is 1m / s. 2 .

[0027] In this embodiment, a hot roller box 5 is provided between the thick rolling mill 3 and the finishing mill portion of the hot rolling production line, and the first intermediate blank cooling device 4-1 is provided at the outlet of the thick rolling mill, at the exit of the hot cabinet 5. Set the second intermedia...

Embodiment 2

[0038] In this example, the 08Al low carbon steel slab is used for ferritic region rolling test. The slab component is: c ≤ 0.08%, Mn ≤ 0.40%, P ≤ 0.025%, s ≤ 0.02%, Al ≤ 0.04% by weight percent. The margin is Fe. At a cooling rate of 1 to 3 ° C / s, the phase change temperature AR3F is 820 ° C, the austenite AC3 temperature is 880 ° C, and the annealing re-crystallization temperature of 620 ° C after cold rolling.

[0039] like figure 2 As shown, the present embodiment replaces the thermal cabinet of the first embodiment to the insulation cover 6 to reduce the tail temperature difference of the blank blank. The stable rolling speed of the thick rolling mill is 5.5m / s, the end of the rough rolling mill is 1 m / s, the roll line speed of the front rough mill of the polishing machine is 1m / s 2 .

[0040] The temperature control method of rolling strip steel in the ferrite region of the present embodiment includes the following steps:

[0041] like figure 2 As shown, the first, s...

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Abstract

The invention relates to a temperature control method for rolled strip steel in a ferrite area. The temperature control method comprises the following steps: arranging a first intermediate billet cooling device at an outlet of a roughing mill, and arranging a second intermediate billet cooling device at an outlet of a hot coil box or a heat preservation cover; controlling the heating temperature of a steel billet to be 1050-1200 DEG C, controlling the temperature of an intermediate billet after rough rolling to be within the austenite temperature range of steel and to be 10-40 DEG C higher than the final temperature of austenite, and detecting the temperature of the intermediate billet in front of an inlet of a finishing mill group in real time; and fully opening a first cooling device, and making the second intermediate billet cooling device adjust the opening and closing combination and the cooling water flow of each pair of coolers in real time according to the temperature, so that the intermediate billet in front of the inlet of the finishing mill group is cooled to be 0 to 30 DEG C higher than the ferrite phase transformation final temperature. According to the temperature control method, the problems that in the prior art, before finish rolling, the temperature of the intermediate billet is not accurately controlled, the temperature of a strip billet is not uniform, and the cooling swing time between rough rolling and finish rolling is too long are solved.

Description

Technical field [0001] The present invention relates to a temperature control method of rolling strip steel in ferrite region, belonging to the field of metal processing technology. Background technique [0002] The ferritic rolling process (also known as a warm rolling, WARM ROLLING) is a research and development of the Belgian Steel Research Center in the late 1980s. It is a hot rolling that produces direct materials that can directly use or provide cold rolling production. plate. The heat-rolled steel production method of ferritic region has the characteristics of rolling process, easy to remove and has a higher elongation and high elongation and deep punching performance R value, which is advantageous for the production of thin specifications of hot rolling steel, Improve the quality of the steel surface. Compared to traditional austenite rolling processes, ferrite rolling processes can shorten the process flow, reduce roll loss, thereby reducing the heating temperature, redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/74B21B1/34
CPCB21B37/74B21B1/34
Inventor 夏小明裴新华徐国利汪明新方少华焦四海
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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