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A production method for controlling grainy defects on the surface of continuous annealed dc01 strip steel
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A production method and technology of DC01, applied in metal rolling and other directions, can solve the problem that pickling affects the surface quality of finished strip steel, and achieve the effect of solving the problem of surface dense grain defects, improving cleaning effect and improving surface quality.
Active Publication Date: 2018-08-31
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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Problems solved by technology
In the process of cold rolling, incomplete pickling, emulsion purging, etc. will also affect the surface quality of the finished strip steel
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Embodiment 1
[0022] Utilize the method involved in the present invention and control measure to produce DC01 steel strip in certain 1450 hot-rolling unit, 1420 cold-rolling unit, continuous annealing unit successively, totally 28 volumes, finished product specification 1.88mm * 1270mm. The relevant control parameters are:
[0023] (1) Control the rolling kilometers of hot rolling to 5-30Km.
[0024] (2) The measured average temperature of the cold-rolled uncoiled steel strip is 35.6°C.
[0025] (3) The speed of the pickling section is 110m / min, and the elongation rate of scale breaking and straightening is 1.0%.
[0026] (4) The roughness of the work rolls of the cold-rolled S5 stand is 0.5 μm.
[0027] (5) In the cleaning section, the amount of iron powder in the cleaning liquid is controlled to be less than 100mg / Kg, and the measured value is 90mg / Kg.
[0028] Check the surface quality of the finished steel strip. There is no surface grain defect on the surface of the continuously ann...
Embodiment 2
[0030] Utilize the method involved in the present invention and control measure to produce DC01 steel strip in certain 1450 hot-rolling unit, 1420 cold-rolling unit, continuous annealing unit successively, totally 32 coils, finished product specification 1.48mm * 1270mm. The relevant control parameters are:
[0031] (1) Control the rolling kilometers of hot rolling to 5-30Km.
[0032] (2) The measured average temperature of the cold-rolled uncoiled steel strip is 38.4°C.
[0033] (3) The pickling speed is 115m / min, and the scaling elongation is 1.5%.
[0034] (4) The roughness of the work rolls of the cold-rolled S5 stand is controlled at 0.5-2 μm.
[0035] (5) In the cleaning section, the amount of iron powder in the cleaning liquid is controlled to be less than 100mg / Kg.
[0036] Check the surface quality of the finished steel strip. There is no surface grain defect on the surface of the continuously annealed DC01 steel strip. The surface appearance of the strip steel is ...
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Abstract
The invention relates to a control method for the surface dense-stripe defects of continuous annealing DC01 strip steel. The following process flow is adopted: the rolling mileage of hot rolling is controlled to be 5-30Km; the uncoiling temperature of cold rolling is not higher than 60 DEG C; an acid pickling speed is controlled to be 100-120m / min, and a scale-breaking tension-levelling elongation is controlled to be 1.0-1.5%; the roughness (Ra) of a working roll of a cold rolling S5 rack is 0.5-2[mu]m; and the amount of iron powder in a cleaning liquid is controlled to be less than 100mg / Kg in a cleaning section. According to the control method disclosed by the invention, the problem of the surface dense-stripe defects of the continuous annealing DC01 strip steel is effectively solved by virtue of the existing equipment and process flow, and the surface quality of the continuous annealing DC01 strip steel is improved.
Description
technical field [0001] The invention belongs to the technical field of material processingengineering, and relates to a production method for controlling surface micrograin defects of continuous annealed DC01 strip steel. Background technique [0002] Surface quality is an important aspect that affects the product quality of continuous annealing strip steel of common plate. The surface of DC01 strip steel produced by cold rolling continuous annealing unit has transverse dense grain defects, such as figure 1 As shown, it not only caused an increase in the number of judgments, but also affected the normal production of the unit. The fine-grained defects on the surface of the plate appear intensively after continuous annealing, and the defects are not obvious in the processes of hot rolling, pickling and cold rolling. Defects mainly appear in the middle part of the continuously annealed sheet surface, and there are no obvious defects in the edge areas on both sides of the str...
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Application Information
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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/22
CPCB21B1/227
Inventor 关建辉孙林丁美良郭德福
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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