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Rolling method for preventing hot-rolled strip steel with thickness of 4mm or less from deviating

A hot-rolled strip and deviation technology, which is applied in metal rolling, temperature control, metal rolling, etc., can solve the problems of cumbersome operation and achieve the effects of simple operation, improved rolling mill operation rate, and reduced stacked steel

Active Publication Date: 2015-03-04
XINYU IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN 102107216A discloses "A Roll Shifting Method for Controlling Strip Deviation". The roll mode and roll shifting step value make the work rolls of adjacent racks wear and cross regularly, which has a certain deviation correction effect, but the roll shifting is required every 2 to 3 pieces of steel, and the operation is cumbersome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: The target material is 50 steel, and the product specification is 3.5mm×1250mm. According to the rolling plan arrangement, 4 pieces of transition material are arranged in a centralized manner, and Q345B steel with the same strength level is selected. The product specification is 4.5mm×1250mm and 4.0 mm×1250mm as the transition material successively Roll 2 pieces in sequence.

[0023] The size of the continuous casting slab is 230mm×1250mm, and the heating temperature control: the preheating period is 40min, the heating period is 80min, the soaking period is 60min, the total time in the furnace is 180min, and the furnace temperature is 1230℃.

[0024] Rough rolling process control: rapid rolling under high pressure is adopted, the exit temperature of rough rolling is controlled at 1070°C, and the thickness of the slab after rough rolling is 36mm.

[0025] Finish rolling process control: strip crown is controlled at 60μm, wedge shape is controlled at ≤20μm, th...

Embodiment 2

[0032] Example 2: The target material is SPHC steel, and the product specification is 2.0mm×1250mm. According to the rolling plan, 6 pieces of transition material are arranged in a centralized manner, and Q235B steel with the same strength level is selected. The products are 3 pieces in the order of 2.5mm×1250mm and 2.3 mm×1250mm. Rolled as transition material.

[0033] The size of the continuous casting slab is 230 mm×1250 mm, and the heating temperature is controlled: the preheating period is 50 minutes, the heating period is 90 minutes, the soaking period is 50 minutes, the total time in the furnace is 190 minutes, and the furnace temperature is 1243 °C.

[0034] Rough rolling process control: rapid rolling under high pressure is adopted, the exit temperature of rough rolling is controlled at 1090°C, and the thickness of the slab after rough rolling is 36mm.

[0035] Finish rolling process control: strip crown is controlled at 40μm, wedge shape is controlled at ≤20μm, th...

Embodiment 3

[0042] Example 3: The target material is Q235B steel, and the product specification is 1.5mm×1250mm. According to the rolling plan arrangement, 8 pieces of transition material are arranged in a centralized manner, and SPHC steel with the same strength level is selected. The products are 4 pieces in the order of 2.0mm×1250mm and 1.8mm×1250mm. Rolled as transition material.

[0043] The size of the continuous casting slab is 230 mm×1250 mm, and the heating temperature is controlled: the preheating period is 49 minutes, the heating period is 91 minutes, the soaking period is 55 minutes, the total time in the furnace is 195 minutes, and the furnace temperature is 1245 °C.

[0044] Rough rolling process control: rapid rolling under high pressure is adopted to prevent the temperature drop of the slab. In order to ensure the temperature, descaling is appropriately reduced. The exit temperature of the rough rolling is controlled at 1095°C, and the thickness of the slab after rough r...

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Abstract

The invention discloses a rolling method for preventing hot-rolled strip steel with the thickness of 4mm or less from deviating. The convexity of the strip steel is controlled to be 40-60 microns, the wedge is controlled to be smaller than or equal to 20 microns, the precision rolling temperature is 1,060-1,100 DEG C, and the finishing rolling temperature is controlled to be 890-910 DEG C; three front precision rolling machine frames F1, F2 and F3 are subjected to great rolling reduction, the rolling reduction rate is 33-56 percent, the tension of the strip steel is adjusted from conventional 5-9MPa to 8-16MPa, the rolling reduction rate of four rear machine frames F4, F5, F6 and F7 is 11-35 percent, and the tension of the strip steel is adjusted from conventional 8-13MPa to 14-23MPa. Technical parameters of a rolling process are optimized, the rolling method in which rolling force plays a leading role is changed, and the rolling method in which tension plays a leading role is innovated; the influences of non-uniform horizontal temperature, wedging and cambering in the rolling process of the strip steel are overcome by increasing the tension, the rolling method is easy to operate and has a convenient adjusting function, and the phenomenon of small specification deviation is greatly reduced, so that the success rate of small specification rolling is improved from 73 percent to 99 percent.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, in particular to a rolling method for preventing deviation of hot-rolled steel strips with a thickness not greater than 4mm. Background technique [0002] In the production process of hot continuous strip steel, due to the influence of uneven lateral temperature, wedge shape, and sickle bend in the strip rolling process, strip deviation often occurs, and the thinner the strip, the easier it is to deviate, especially when the rolling thickness is 1.2mm~ The 4.0mm thin-gauge steel strip has rapid temperature drop, high plastic deformation resistance, and more serious deviation phenomenon during the rolling process in the finishing rolling area. The deviation problem that often occurs in the conventional finishing rolling production process, if it is not dealt with in time, will cause production accidents such as stacking and jamming of steel in the finishing rolling area, reduce the rolling s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/28B21B37/50B21B37/74B21B37/68
CPCB21B37/28B21B37/50B21B37/68B21B37/74
Inventor 陈建华唐彬桂彭军明唐小勇吴洪王国文傅松林杨帆喻建林郭明清余小琴邹苏华
Owner XINYU IRON & STEEL CO LTD
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