Manufacture method for preventing edge crack generated during low-carbon cold rolling of paper-thin strip steel

A technology of ultra-thin strip and steel edge, applied in metal rolling, manufacturing tools, metal rolling, etc., to achieve the effect of eliminating edge crack defects of strip steel, improving production efficiency, and maintaining edge quality

Inactive Publication Date: 2010-08-25
NINGBO IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The technical problem to be solved by the present invention is to provide a method for preventing edge cracking of low-carbon cold-rolled ultra-thin strip steel, so as to solve the problem of edge cracking of ultra-thin strip steel in the prior art

Method used

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  • Manufacture method for preventing edge crack generated during low-carbon cold rolling of paper-thin strip steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Production method, steps:

[0056] 1) Smelting: Desulfurization of molten iron, converter smelting, argon blowing treatment in argon station, continuous casting, the chemical composition (by weight %) of the steel produced is: C 0.035, Si 0.01, Mn 0.22, P 0.013, S 0.007, Als 0.037, N 0.0025, and the rest are Fe and unavoidable impurities.

[0057] 2) Conduct hot rolling controlled rolling and controlled cooling: heat the slab to 1220°C, the temperature difference between the same slabs is ≤35°C; the exit temperature of rough rolling is 1070°C, and the side pressure is 30mm; 895°C, the thickness of the hot-rolled coil is 3.0mm, and the width is 1015mm. After the final rolling, the front cooling is adopted, and the cooling rate is 20°C / s; the coiling temperature is 690°C; the wear depth of the guide plate liner on the entrance side of the coiler is controlled <3mm, And the number of wear grooves on the lining plate is less than 2; the grain structure of the hot-rolled pl...

Embodiment 2

[0060] Production method, steps:

[0061] 1) Smelting: Desulfurization of molten iron, converter smelting, argon blowing treatment in argon station, continuous casting, the chemical composition (by weight %) of the steel produced is: C 0.06, Si 0.012, Mn 0.24, P 0.022, S 0.012, Als 0.041, N 0.0035, and the rest are Fe and unavoidable impurities.

[0062] 2) Conduct hot rolling and controlled rolling and controlled cooling: heat the slab to 1230°C, the temperature difference between the same slabs is ≤33°C; the exit temperature of rough rolling is 1075°C, and the side pressure is 40mm; the side pressure of the finishing rolling F1E vertical roll is 6mm; 890°C, the thickness of the hot-rolled coil is 2.75mm, and the width is 1010mm. After the final rolling, the front cooling is adopted, and the cooling rate is 18°C / s; the coiling temperature is 669°C; the wear depth of the guide plate liner on the entrance side of the coiler is controlled <5mm, And the number of wear grooves on...

Embodiment 3

[0065] Production method, steps:

[0066] 1) Smelting: Desulfurization of molten iron, converter smelting, argon blowing treatment in argon station, continuous casting, the chemical composition (by weight %) of the steel produced is: C 0.065, Si 0.018, Mn 0.31, P 0.024, S 0.019, Als 0.043, N 0.0044, and the rest are Fe and unavoidable impurities.

[0067] 2) Conduct hot rolling and controlled rolling and controlled cooling: heat the slab to 1245°C, the temperature difference between the same plates is ≤38°C; the exit temperature of rough rolling is 1088°C, and the side pressure is 45mm; the side pressure of F1E vertical roll for finish rolling is 4mm; 889°C, the thickness of the hot-rolled coil is 3.5mm, and the width is 1010mm. After the final rolling, the front cooling is adopted, and the cooling rate is 18°C / s; the coiling temperature is 661°C; the wear depth of the guide plate liner on the entrance side of the coiler is controlled <6mm, And the number of worn grooves on t...

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Abstract

The invention relates to a manufacture method for preventing edge crack generated during low-carbon cold rolling of paper-thin strip steel, which sequentially comprises the steps: melting, plate blank heating, coarse milling, fine milling, cooling, coiling, acid washing, cold rolling, annealing and finishing and edge cutting, wherein the edge is not cut during steel coil acid washing, and the circular arc-shaped edge is maintained when the steel enters the cold rolling work procedure after the acid washing. The same plate temperature different in the plate blanking heating is lower than or equal to 40 DEG C, and the side pressure amount of the coarse milling is smaller than or equal to 50 mm. The final rolling temperature of the fine rolling is between 880 and 920 DEG C, an auxiliary vertical roller F1E of a machine frame F1 has the side pressure amount of 3 to 10 mm. The cooling is the laminar cooling of fast front section cooling with the cooling speed between 15 and 30 DEG C/s. The coiling temperature is between 650 and 710 DEG C. The single-edge cutting amount during the edge cutting is controlled between 5 and 7 mm, and the double-edge cutting amount is controlled between 10 and 14 mm. The thickness of cold rolling finished products of strip steel is between 0.15 and 0.45 mm, and the pressing rate is between 87.1 and 95 percent. The invention can solve the problem of edge crack of the paper-thin strip steel in the prior art.

Description

technical field [0001] The invention belongs to the technical field of low-carbon cold-rolled steel strips, in particular to a manufacturing method for preventing edge cracks in low-carbon cold-rolled ultra-thin strips. Background technique [0002] The domestic annual demand for low-carbon hot-rolled strip steel for cold-rolled base materials is 15 million tons, especially in the surrounding areas of Ningbo, Zhejiang Province, where the electronics, home appliances and color-coated construction board industries are very developed, and the Yangtze River Delta area produces cold-rolled thin strip steel. There are many medium and small cold-rolling plants, most of which use low-carbon steel, ultra-thin cold-rolled sheets, galvanized sheets, and color-coated sheets with a thickness of less than 0.5mm, with an annual consumption of more than 3 million tons. [0003] At present, domestic cold rolling mills generally adopt single-stand or double-stand reversing cold rolling units,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/22C22C38/04B21B37/00B21B37/74
Inventor 罗石念孔祥胜苗润涛
Owner NINGBO IRON & STEEL
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