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A method for controlling cross-folding of continuous annealed non-oriented silicon steel

A technology of oriented silicon steel and control method, applied in rolling mill control device, heat treatment process control, metal rolling and other directions, can solve the problem of less research on strip cross-folding and printing, and achieve good economic benefits, good section profile, low wave shape effect

Active Publication Date: 2017-01-04
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above studies are all aimed at the transverse folds produced in the flattening process after bell annealing, but there are few studies on the transverse folds produced in the continuous annealing process of the strip

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Mass production of 676 rolls of 50W800, 563 rolls of 50W1300, specifications 0.5mm*1200mm, related process parameters:

[0031] Smelting process

[0032] The target chemical composition (by weight %) of 50W800 is: C 0.002, Si 0.75, Mn 0.25, Al 0.33, P<0.030, S<0.005, and the rest are Fe and unavoidable impurities; the target chemical composition of 50W1300 is: C 0.0025, Si 0.4, Mn 0.23, Al<0.005, P<0.060, S<0.0035, and the rest are Fe and unavoidable impurities.

[0033] hot rolling process

[0034] The target temperature of 50W800 and 50W1300 is 1150℃, the furnace time is ≥150min, the target temperature of rough rolling exit is 1000℃, the target temperature of final rolling is 865℃, and the target temperature of coiling is 700℃.

[0035] The rolling kilometers of 50W800 and 50W1300 are controlled within 45 kilometers, the hot-rolled strip crown is controlled at 40±5μm, the average absolute wedge shape of the hot-rolled strip is less than 30μm, and the local high poin...

Embodiment 2

[0042] Mass production of 161 rolls of 50W800, 399 rolls of 50W1300, specifications 0.5mm*1200mm, related process parameters:

[0043] Smelting process

[0044] The target chemical composition (by weight %) of 50W800 is: C 0.002, Si 0.75, Mn 0.25, Al 0.33, P<0.030, S<0.005, and the rest are Fe and unavoidable impurities; the target chemical composition of 50W1300 is: C 0.0025, Si 0.4, Mn 0.23, Al<0.005, P<0.060, S<0.0035, and the rest are Fe and unavoidable impurities.

[0045] hot rolling process

[0046] The target temperature of 50W800 and 50W1300 is 1150℃, the furnace time is ≥150min, the target temperature of rough rolling exit is 1000℃, the target temperature of final rolling is 865℃, and the target temperature of coiling is 700℃.

[0047] The rolling kilometers of 50W800 and 50W1300 are controlled within 45 kilometers, the crown of the hot-rolled strip is controlled at 40±5μm, the average absolute wedge shape of the hot-rolled strip is less than 20μm, and the local hi...

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Abstract

The invention relates to a control method of a continuous-annealing non-oriented silicon steel cross wrinkle. The following optimized process parameters are adopted: the hot rolling miles are controlled within 45 kilometers; the convexity of hot-rolled strip steel is controlled at 40+ / -5 micrometers; the average absolute wedge of the total length of the hot-rolled strip steel is less than 20 micrometers; a local height point of the hot-rolled strip steel is less than 12 micrometers; the yield strength of cold-rolled strip steel is more than 230MPa; a fine cooling system is put into cold rolling, and a working roll is adopted for sectional cooling; the tension in a continuous annealing furnace is controlled within 6.0N / mm<2>. According to the invention, the existing equipment is adequately utilized, the hot-rolling process, the cold-rolling process and the continuous annealing process are optimized, the probability of the defects of the cold-rolled continuous annealing silicon steel cross wrinkle can be greatly reduced, the requirements for the performance and shape of a finished product can be met, and the economic benefit is good.

Description

technical field [0001] The invention belongs to the field of material processing engineering, and relates to a method for controlling the horizontal folding of continuous annealed non-oriented silicon steel. Background technique [0002] Non-oriented silicon steel is mainly used in electrical steels such as small motors, micro motors, closed motors, and rectifiers. It is an indispensable and important soft magnetic alloy for electric power, electronics, and military industries. Non-oriented silicon steel needs to be annealed. First, recrystallization must be completed, and then the grains will grow to form perfect and uniform recrystallized grains. The second is to carry out decarbonization to reduce the carbon content to the range required by the finished product. The annealing process is a key process for non-oriented silicon steel to obtain the final magnetic and mechanical properties. [0003] According to different equipment, the annealing of strip steel can be divide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/02B21B1/22B21B37/00C21D11/00C21D8/12
CPCB21B1/22B21B37/00C21D8/0221
Inventor 丁美良郭德福孙林熊文涛
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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