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Method for reducing CSP casting billet surface longitudinal microcrack and folding defect
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A longitudinal crack and wrinkle technology, which is applied in the field of iron and steel smelting and continuous casting, can solve problems such as wrinkled cold-rolled galvanized sheets, and achieve the effect of reducing surface defects, longitudinal cracks and wrinkles
Active Publication Date: 2009-07-15
MAANSHAN IRON & STEEL CO LTD
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Abstract
Description
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Problems solved by technology
These processes cause longitudinal micro-cracks and wrinkle defects on the surface of the slab, and finally cause more than 30 cracks / 1000 meters on the surface of the cold-rolled galvanized sheet
Method used
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Examples
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Effect test
Embodiment 1
[0016] In the CSP continuous casting process: the tundish covering agent is Al 2 o 3 —CaO, the width of the end face of the mold is 90mm, the vibration curve of the mold is non-sinusoidal, high-frequency and small-amplitude vibration, there are no scratches and cracks visible to the naked eye on the copper plate of the mold, and the molten steel in the tundish is poured under the protection of argon seal ;
[0017] In the LF refining process: the weight components of molten steel are controlled to be 0.020% C, 0.01% Si, 0.08% Mn, 0.005% P, 0.001% S, 0.02% [Al S ], the total oxygen T.O content of molten steel is less than 0.0025%.
[0018] Example 1 The number of crack defects on the surface of the cold-rolled galvanized sheet is 4 / 1000m.
Embodiment 2
[0020] In the CSP continuous casting process: the tundish covering agent is Al 2 o 3 —CaO, the width of the end face of the mold is 95mm, the vibration curve of the mold is non-sinusoidal, high-frequency and small-amplitude vibration, there are no scratches and cracks visible to the naked eye on the copper plate of the mold, and the molten steel in the tundish is poured under the protection of argon seal ;
[0021] In the LF refining process: control the weight components of molten steel to 0.040% C, 0.025% Si, 0.01% Mn, 0.01% P, 0.002% S, 0.045% [Al S ], the total oxygen T.O content of molten steel is less than 0.0025%.
[0022] Example 2 The number of crack defects on the surface of the cold-rolled galvanized sheet is 2 / 1000m.
Embodiment 3
[0024] In the CSP continuous casting process: the tundish covering agent is Al 2 o 3 —CaO, the width of the end face of the mold is 100mm, the vibration curve of the mold is non-sinusoidal, high-frequency and small-amplitude vibration, there are no scratches and cracks visible to the naked eye on the copper plate of the mold, and the molten steel in the tundish is poured under the protection of argon seal ;
[0025] In the LF refining process: the weight components of molten steel are controlled to be 0.055% C, 0.04% S, 0.12% Mn, 0.015% P, 0.003% S, 0.06% [Al S ], the total oxygen T.O content of molten steel is less than 0.0025%.
[0026] Example 3 The number of crack defects on the surface of the cold-rolled galvanized sheet is 1 / 1000m.
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Abstract
The invention discloses a method for reducing longitudinal cracks and wrinkle defects on the surface of a CSP slab, which includes an LF refining process and a CSP continuous casting process. In the CSP continuous casting process: the tundish covering agent is Al2O3-CaO, and the crystallizer end face The width of the mold is 90-100mm, the vibration curve of the mold is non-sinusoidal, and there are no scratches and cracks visible to the naked eye on the copper plate of the mold; in the LF refining process: control the weight percentage of molten steel [S] ≤ 0.003%, Aluminum [Als] weight percentage content = 0.02% ~ 0.06%, total oxygen T.O weight percentage content < 0.0025%. Compared with the prior art, the invention can effectively reduce the longitudinal micro-cracks and wrinkles on the surface of the CSP slab, and finally reduce the number of cracks on the surface of the cold-rolled galvanized sheet.
Description
Technical field: [0001] The invention belongs to the technical field of iron and steel smelting and continuous casting, relates to the smelting and continuous casting process of CSP technology, in particular to the smelting and continuous casting process of CSP hot-rolled coil used as raw material of cold-rolled galvanized sheet. Background technique: [0002] At present, the proportion of CSP hot-rolled coils as cold-rolled raw materials is as high as 70-80%, which can reduce production costs, but surface and internal quality problems of CSP hot-rolled coils will cause surface defects of cold-rolled galvanized products. The slab produced by the traditional long-flow coil production process is thick and the casting speed is low. After the slab is cooled, the surface defects can be inspected and then removed. After the defects are removed, the slab is reheated for hot rolling. Thin slab, high casting speed, thick and dense scale on the surface, direct rolling and other charac...
Claims
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Application Information
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