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High-strength thin steel sheet drawable and excellent in shape fixation property and method of producing the same

A high-strength steel plate and a production method technology, applied in the field of high-strength thin steel plates, can solve the problems of improving ductility, not mentioned, not disclosed, etc.

Inactive Publication Date: 2007-11-07
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the invention neither mentions {554}, {111}, and {111} orientation components, nor does it disclose any technique for improving drawability

Method used

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  • High-strength thin steel sheet drawable and excellent in shape fixation property and method of producing the same
  • High-strength thin steel sheet drawable and excellent in shape fixation property and method of producing the same
  • High-strength thin steel sheet drawable and excellent in shape fixation property and method of producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0217] The steel sheet according to any one of items (1) to (5) will be described in more detail below.

[0218] Steels A to L having the chemical compositions listed in Table 1 were melted and refined in a converter, continuously cast into slabs, reheated and rolled into 1.2 to 5.5 mm thick steel plates by rough rolling and finish rolling, and then coiled. Note that the chemical composition in the table is in mass percentage.

[0219] Table 2 shows details of production conditions. In the table, "SRT" represents the reheating temperature of the slab, "FT" represents the finish rolling temperature at the final pass, and "reduction rate" represents the 3 Total reduction in the range of transition temperature +100°C or lower. Note that in the case of cold rolling after hot rolling, there is no need to make restrictions, therefore, each corresponding "reduction rate" box is filled with a horizontal line, which means "not applicable". In addition, "lubricated" refers to t...

Embodiment 2

[0248] The steel sheet according to any one of (8) to (10) will be described in detail below.

[0249] Steels A to L having the chemical composition listed in Table 3 were melted and refined in a converter, continuously cast into slabs, reheated at the temperature shown in Table 4 and rolled to a thickness of 1.2 to 5.5 mm by rough rolling and finish rolling steel plate, and then coiled. Note that the chemical composition in the table is in mass percentage. As shown in Table 4-1, 4-2, and 4-3, some steels are lubricated during hot rolling. After rough rolling, the impact pressure of steel L is 2.7MPa and the flow rate is 0.001 liter / cm 2 descaling under conditions. In addition, as shown in Table 2, some steel sheets were pickled, cold-rolled, and heat-treated after the hot-rolling process. The thickness of cold-rolled steel sheets ranges from 0.7 to 2.3mm. In addition, among the above-mentioned steels, the steels G and A-8 were galvanized.

[0250] Table 4 shows t...

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Abstract

The present invention provides a high-strength thin steel sheet drawable and excellent in a shape fixation property and a method of producing the same. For the steel sheet, on a plane at the center of the thickness of a steel sheet, the average ratio of the X-ray strength in the orientation component group of {100}<011> to {223}<110> to random X-ray diffraction strength is 2 or more and the average ratio of the X-ray strength in three orientation components of {554}<225>, {111}<110> and {111}<110> to random X-ray diffraction strength is 4 or less. The arithmetic average of the roughness Ra of at least one of the surface is 1 to 3.5 mum; the surfaces of the steel sheet are covered with a composition having a lubricating effect; and the friction coefficient of the steel sheet surfaces at 0 to 200 DEG C is 0.05 to 0.2. Further, the present invention also relates to a method of producing said steel sheet, characterized by: rolling a steel sheet having the chemical components specified in the present invention at a total reduction ratio of 25% or more in the temperature range of the Ar3 transformation temperature +100 DEG C or lower.

Description

technical field [0001] The invention relates to a high-strength thin steel plate which can be drawn and has excellent setting performance and a production method of the thin steel plate. In particular, with the present invention, good drawability can be obtained even using a steel sheet that is structurally unsuitable for drawing processing. Background technique [0002] Recently, the use of aluminum alloys and other light metals and high-strength steel sheets in automobiles has expanded in order to reduce the weight of automobiles and thereby reduce fuel consumption and obtain other related advantages. However, although light metals such as aluminum alloys have the advantage of high specific strength, their applications are limited to special purposes because they are far more expensive than steel. Therefore, in order to further reduce the weight of automobiles, wider use of low-cost, high-strength steel sheets is highly desired. [0003] However, after bending deformatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D8/00C21D8/02C21D8/04C22C38/02C22C38/04C22C38/06C23C2/06C23C2/26C23C28/00C23C30/00
CPCC21D2211/008C23C2/06C22C38/04C21D2211/001C21D8/0236C21D8/0273C21D8/0426C21D8/0478C22C38/02C21D8/0473C21D8/0278C21D8/0436C23C30/00C22C38/06C23C2/26C21D2211/005C21D2211/002C23C2/50
Inventor 横井龙雄林田辉树杉浦夏子中村隆彰中本武广
Owner NIPPON STEEL CORP