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Control method for eliminating finishing surface contusion of hot-rolled strip steel
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A finishing surface and control method technology, which is applied in the control field of eliminating hot-rolled strip finishing surface contusion, can solve the problems affecting the quality of strip steel, strip contusion defects, and reducing the leveling speed, etc., to achieve the elimination of contusion defects, practical Strong, quality-enhancing effect
Active Publication Date: 2014-07-30
武汉钢铁有限公司
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Problems solved by technology
After being coiled by hot strip steel, the temperature of the steel coil is naturally cooled from 500-700°C to below 50°C. The temperature change span is large, and the size of the strip will shrink to a certain extent, resulting in the gap between the layers of the coil. If there is a gap, when the cold strip is uncoiled and leveled, if the control method is improper, the relative slip between the strip layers will occur, and the surface of the strip will have contusion defects (such as figure 1 As shown), at present, the method of controlling surface contusion defects in the hot rolling production line is simply to adjust the tempering tension of the temperingmachine and reduce the tempering speed when the strip is tempered, and no other method has been seen.
However, the problem has not been fundamentally resolved, and contusion defects occur from time to time, seriously affecting the quality of the strip steel
Method used
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Embodiment 1
[0061] Produce thin gauge (h=1.4mm) Q235 and SPHC thin strip steel.
[0062] (1) Hot strip coiling process
[0063] ①Cooling of strip head:
[0064] Strip specification (mm)
[0065] ②Setting of bite tension coefficient:
[0066] Strip Thickness (mm)
[0067] ③Coiler reel pre-expansion value setting
[0068] Strip Thickness (mm)
[0069] (2) Leveling process parameters
[0070] ①Unwinding tension and coiling tension
[0071] Strip specification (mm)
[0072] After implementation, no defects of surface contusion were found through inspection.
Embodiment 2
[0074] Produce thin gauge (h=0.8mm) Q235 and SPHC thin strip steel.
[0075] (1) Hot strip coiling process
[0076] ①Cooling of strip head:
[0077] Strip specification (mm)
[0078] ②Setting of bite tension coefficient:
[0079] Strip Thickness (mm)
[0080] ③Coiler reel pre-expansion value setting
[0081] Strip Thickness (mm)
[0082] (2) Leveling process parameters
[0083] ①Unwinding tension and coiling tension
[0084] Strip specification (mm)
[0085] After implementation, no defects of surface contusion were found through inspection.
example 3
[0086] Example 3: Production of Q235B and Q345B of thin specification (h=1.8mm).
[0087] (1) Hot strip coiling process
[0088] ①Cooling of strip head:
[0089] Strip Thickness (mm)
[0090] ②Setting of bite tension coefficient:
[0091] Strip Thickness (mm)
[0092] ③Coiler reel pre-expansion value setting
[0093] Strip Thickness (mm)
[0094] (2) Leveling process parameters
[0095] ①Unwinding tension and coiling tension
[0096] Strip specification (mm)
[0097] After implementation, no defects of surface contusion were found through inspection.
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Abstract
The invention discloses a control method for eliminating the finishing surface contusion of hot-roller strip steel, and solves the problem about the finishing surface contusion of the conventional hot-rolled strip steel. The technical scheme is that the control method comprises the following processes: coiling and cooling hot strip steel, uncoiling cold strip steel, flattening and coiling; and controlling parameters of the temperature of the head of hot strip steel, the uncoiling tension and the coiling tension of the cold strip steel, and the like according to the different thicknesses of the strip steel so as to eliminate the finishing surface contusion of the hot-rolled strip steel. By adopting the control method, the finishing surface contusion of the hot-rolled strip steel is eliminated by the control of simple process conditions on the premise of not changing the conventional process flow and equipment of the hot-rolled strip steel; the effect is remarkable; the control method is applicable to the production of thin strip steel with various models and thicknesses.
Description
technical field [0001] The invention relates to a finishing method of hot-rolled strip steel, in particular to a control method for eliminating contusion on the finishing surface of hot-rolled strip steel. Background technique [0002] The shape quality of hot-rolled thin gauge (h<=2.0mm) steel strips cannot meet customer needs, and can only be used by customers after being leveled by a temperingmachine. The usual process is: after the hot-rolled strip is coiled by hot strip, cooled, and uncoiled, leveled and coiled by the cold strip, the finished thin strip is obtained. After being coiled by hot strip steel, the temperature of the steel coil is naturally cooled from 500-700°C to below 50°C. The temperature change span is large, and the size of the strip will shrink to a certain extent, resulting in the gap between the layers of the coil. If there is a gap, when the cold strip is uncoiled and leveled, if the control method is improper, the relative slip between the stri...
Claims
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Application Information
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