Soft tinning raw steel plate and manufacture method thereof
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A manufacturing method and steel plate technology, which is applied in the field of steel plate production, can solve problems such as excessive inclusions of Al2O3, achieve the effects of reducing inclusion content and improving formability
Inactive Publication Date: 2013-02-06
ANGANG STEEL CO LTD
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Problems solved by technology
[0008] The purpose of the present invention is to solve the problem of excessive aluminum oxide inclusions in the prior art steel, and to provide a soft tin-plated original steel plate that can meet the requirements of the continuous annealing production method and its manufacturing method
Method used
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Embodiment 1
[0028] The chemical composition of steel is: C 0.01%, Si 0.01%, Mn 0.30%, P 0.01%, S 0.008%, Al 0.02%, N 0.002%, O 0.001%, Ti 0.07%, the rest is Fe and some inevitable Impurity elements; the oxygen activity at the end of the converter is controlled below 0.04%; the maximum continuous annealing temperature is 720℃, the over-aging temperature is 450℃, and the leveling elongation is 1.0%.
[0029] The surface Rockwell hardness (HR30Tm) value of the cold rolled tin plate after annealing is 56, the inclusion grade is D0, and there is no yield platform.
Embodiment 2
[0031] The chemical composition of steel is: C 0.002%, Si 0.01%, Mn 0.15%, P 0.007%, S 0.004%, Al 0.00%, N 0.001%, O 0.0008%, Ti 0.04%, Ca 0.001%, and the rest are Fe and Some unavoidable impurity elements; the oxygen activity at the end of the converter is controlled below 0.03%; the maximum continuous annealing temperature is 780℃, the over-aging temperature is 410℃, and the flat elongation is 1.7%.
[0032] The surface Rockwell hardness (HR30Tm) of the cold rolled tin plate after annealing is 52, the inclusion grade is D0, and there is no yield platform.
Embodiment 3
[0034] The chemical composition of steel is: C 0.002%, Si 0.01%, Mn 0.13%, P 0.012%, S 0.006%, Al 0.001%, N 0.001%, O 0.0008%, Ti 0.02%, Nb 0.02%, Mg 0.001%, The rest are Fe and some unavoidable impurity elements; the end-point oxygen activity of the converter is controlled below 0.03%; the maximum continuous annealing temperature is 800℃, the over-aging temperature is 430℃, and the flat elongation is 2.2%.
[0035] The surface Rockwell hardness (HR30Tm) of the cold rolled tin plate after annealing is 50, the inclusion grade is D0, and there is no yield platform.
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Abstract
The invention provides a soft tinning raw steel plate and a manufacture method of the soft tinning raw steel plate. The steel plate is prepared from the following chemical components in percentage by weight: 0.0001 to 0.010% of C, not greater than 0.02% of Si, 0.10 to 060% of Mn, not greater than 0.02% of P, not greater than 0.02% of S, not greater than 0.02% of Al, not greater than 0.002% of N, not greater than 0.005% of O, 0.005 to 0.05% of Nb, and/or 0.005 to 0.07% of Ti, and the balance of Fe. The manufacture method comprises the technical processes as follows: preprocessing molten iron-melting through a converter-refining outside the converter-protectively casting-performing hot rolling-pickling and performing cold rolling-annealing- inspecting-packaging; activity of end-point oxygen of a molten iron is controlled to reach a value of 0.02 to 0.06% during melting by the converter; the molten iron is processed in vacuum during being refined outside the furnace; contents of alloy elements such as C and Mn are precisely controlled; and the contents of gases such as oxygen and nitrogen in the molten iron can be reduced. By adopting the manufacture method provided by the invention, a problem that the soft tinning raw steel plate is relatively hardly produced by a continuous annealing method can be solved, content of inclusion in steel can be decreased, and a forming performance of the steel plate can be improved.
Description
Technical field [0001] The invention belongs to the technical field of steel plate production, and particularly relates to a soft tinned raw steel plate and a manufacturing method thereof. Background technique [0002] Tin plate is a symbolic and basic product of a large modern steel company. It is the most direct manifestation of the company's smelting, rolling and coating level. The production of tin plate is a systematic project, and each process will affect the final performance of the material. Among them, the steel purity control and inclusion control in the steelmaking process are the basis for obtaining high-quality cold-rolled tin plate. [0003] Generally, the tin plate materials used for beverage cans and food cans are distinguished by the degree of quenching and tempering. The Rockwell hardness HR30Tm of the quenching and tempering degree indicates that the primary cold-rolled product is divided into T1-5 according to the hardness of the material, and the secondary col...
Claims
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Application Information
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