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Steel sheet and plated steel sheet

一种钢板、镀覆的技术，应用在热浸镀工艺、涂层、炉子类型等方向，能够解决不清楚拉伸凸缘性、母材及冲裁加工部疲劳特性不良好等问题，达到优异拉伸凸缘性、疲劳特性良好、防止损伤的效果

Pending Publication Date: 2019-04-02
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is unclear whether the steel sheets described in Patent Documents 1 to 3 can ensure sufficient stretch flangeability even when strain distribution is taken into consideration.
In addition, the conventional high-strength steel sheet has excellent tensile flangeability, and the fatigue properties of the base material and the punched part are not good

Method used

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  • Steel sheet and plated steel sheet
  • Steel sheet and plated steel sheet
  • Steel sheet and plated steel sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0192] Next, examples of the present invention will be described. The conditions in the examples are examples of conditions employed to confirm the feasibility and effects of the present invention, and the present invention is not limited to the examples of conditions. In the present invention, various conditions can be adopted as long as the object of the present invention is achieved without departing from the gist of the present invention.

[0193] Steels having the chemical compositions shown in Tables 1 and 2 were melted to produce billets, and the obtained billets were heated to the heating temperatures shown in Tables 3 and 4. Rough rolling was performed under the conditions shown in Table 3 and Table 4, and then finish rolling was performed under the conditions shown in Table 3 and Table 4. The thickness of the hot-rolled steel sheet after finish rolling is 2.2 to 3.4 mm. Blank columns in Table 1 and Table 2 mean that the analytical value is lower than the detection ...

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PUM

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Abstract

This steel sheet has a specific chemical composition and is provided with a structure represented by, in terms of area ratio, 30-95% ferrite and 5-70% bainite. When a crystal grain is defined as a region which is surrounded by grain boundaries having a misorientation of 15D or higher and for which the equivalent circle diameter is 0.3 Mum or larger, the proportion of crystal grains having an intragranular misorientation of 5-14D relative to all of the crystal grains is 20-100% in terms of area ratio. The average aspect ratio of ellipses equivalent to the crystal grains is 5 or lower. The average distribution density of the total of Ti carbides and Nb carbides having a particle size of 20 nm or larger in the ferrite grain boundaries is 10 particles / Mum or lower.

Description

technical field [0001] The present invention relates to steel sheets and plated steel sheets. Background technique [0002] In recent years, weight reduction of various components has been demanded for the purpose of improving the fuel economy of automobiles. In response to this demand, the thinning of steel sheets used in various members due to higher strength, and the application of light metals such as Al alloys to various members are progressing. Light metals such as Al alloys have higher specific strength than heavy metals such as steel. However, light metals are significantly more expensive than heavy metals. Therefore, the application of light metals such as Al alloys is limited to special applications. Therefore, in order to reduce the weight of various members more cheaply and apply them in a wide range, it is required to reduce the thickness of the steel plate by increasing the strength. [0003] Steel sheets used in various parts of automobiles require not onl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/58C21D9/46
CPCC21D9/46C22C38/00C22C38/58C21D8/0205C21D8/0226C21D8/0236C21D2201/05C21D2211/002C21D2211/005C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/26C22C38/28C22C38/38C22C38/44C22C38/50C23C2/06C23C2/40
Inventor 佐野幸一宇野诚西山亮一山口裕司杉浦夏子中田匡浩
Owner NIPPON STEEL CORP
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