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Thin-specification container board and manufacturing method thereof

A container and thin-gauge technology, which is applied in the field of thin-gauge container boards and their preparation, can solve the problems of high cost, achieve reasonable content, suppress copper brittle defects, and reduce costs

Active Publication Date: 2020-12-11
湖南华菱涟钢特种新材料有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the embodiments of the present application is to provide a thin-gauge container plate and its preparation method to solve the technical problem of adding a large amount of expensive Cu and Ni corrosion-resistant alloy elements to the thin-gauge container plate in the prior art and the high cost

Method used

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  • Thin-specification container board and manufacturing method thereof
  • Thin-specification container board and manufacturing method thereof
  • Thin-specification container board and manufacturing method thereof

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preparation example Construction

[0029] The present application also provides a method for preparing a thin container board, comprising the following steps:

[0030] Heating the steel slab composed of the above, the furnace temperature in the soaking furnace or the first 4 zones of the heating furnace is controlled at 1200-1300°C, the temperature of the steel slab out of the furnace is 1120-1160°C, and the time in the furnace is within 40min;

[0031] The heated steel slab is continuously rolled to obtain a steel plate, and coiled to obtain a steel coil; the initial rolling temperature of the continuous rolling is 1120-1160°C, and the final rolling temperature is 820-920°C.

[0032]Steel billets can be prepared by various methods, such as desulfurization pretreatment of blast furnace molten iron, the desulfurization pretreated blast furnace molten iron is mixed into oxygen top-bottom composite blowing converter (such as 100t level) for smelting, and the smelted molten steel is treated by argon blowing and calc...

Embodiment 1

[0048] The smelted molten steel (the chemical composition weight percentage of molten steel is: C: 0.05%, Si: 0.25%, Mn: 0.35%, P: 0.08%, S: 0.004%, Cu: 0.26%, Cr: 0.35%, Ti : 0.035%, the balance is Fe and unavoidable impurity elements), cast into a 70mm thick slab, the continuous casting casting speed is 4.4m / min, the slab entering furnace temperature is 940°C, and the slab is sent into the tunnel heating furnace Heating; the temperatures in zones 1-7 of the heating furnace are 1250°C, 1265°C, 1260°C, 1255°C, 1230°C, 1220°C, and 1205°C respectively, and the slab stays in the furnace for 29 minutes; the temperature at the entrance of the rolling mill is 1140°C, and the exit of the final rolling The temperature is 910°C, the coiling temperature is 610°C, and finally rolled into container plates with a thickness of 1.6mm. The yield strength of the steel plate is 446MPa, the tensile strength is 535MPa, the elongation is 25%, and d=a is qualified for cold bending.

Embodiment 2

[0050] The smelted molten steel (the chemical composition weight percentage of molten steel is: C: 0.06%, Si: 0.29%, Mn: 0.4%, P: 0.09%, S: 0.003%, Cu: 0.29%, Cr: 0.4%, Ti : 0.032%, the balance is Fe and unavoidable impurity elements), cast into a 60mm thick slab, the continuous casting casting speed is 4.6m / min, the slab entering furnace temperature is 960°C, and the slab is sent into the tunnel heating furnace for Heating; the temperatures in zones 1-7 of the heating furnace are 1260°C, 1265°C, 1265°C, 1250°C, 1240°C, 1220°C, and 1210°C respectively, and the slab stays in the furnace for 33 minutes; the temperature at the entrance of the rolling mill is 1155°C, and the exit of the final rolling The temperature is 910°C, the coiling temperature is 610°C, and finally rolled into container plates with a thickness of 1.6mm. The yield strength of the steel plate is 452MPa, the tensile strength is 546MPa, the elongation is 27%, and d=a is qualified for cold bending.

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Abstract

The embodiment of the invention provides a thin-specification container board. Thin-specification container board steel consists of the following components in percentage by mass: 0.05%-0.065% of C, 0.20%-0.4% of Si, 0.30%-0.45% of Mn, 0.07%-0.12% of P, 0.3-0.5% of Cr, 0.03-0.05% of Ti, less than or equal to 0.006% of S, 0.20%-0.35% of Cu, and the balance of Fe and other inevitable impurities. Thethin-specification container board is reasonable in constituent elements, which are matched with one another, and corresponding content. The constituent elements do not comprise an element Ni, and content of P and Cu is controlled to compensate loss of strength and weather resistance of the Ni-reduced thin-specification container board, and restrain occurrence of the copper brittleness defect. The thin-specification container board is lower in cost without higher-cost element Ni, and has better mechanical property and weather resistance.

Description

technical field [0001] The present application relates to the technical field of container boards, and more specifically, relates to a thin-gauge container board and a preparation method thereof. Background technique [0002] As a major product in hot-rolled commodity coils, container plate has an annual demand of about several million tons. Its notable features are thin specifications, high strength and high weather resistance. The thinnest commonly used specification thickness is 1.6mm, accounting for about The ratio is 16%, and the tensile strength is required to be greater than 490MPa. Compared with ordinary carbon steel Q235B, the relative corrosion rate of 72h cycle infiltration corrosion is less than 60%. In order to ensure the weather resistance of the steel, a large amount of expensive Cu and Ni corrosion-resistant alloy elements are added, which also significantly increases the cost of the alloy. Therefore, it is of great significance to carry out research on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/20C22C38/28C21D8/02
CPCC22C38/02C22C38/04C22C38/20C22C38/28C22C38/002C21D8/0205C21D8/0226
Inventor 梁亮李光辉严立新胡大董常福汪宏兵郑庆李丹吴浩鸿朱晔
Owner 湖南华菱涟钢特种新材料有限公司
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