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High strength steel plate with excellent warm and room-temperature formability and warm forming method thereof

一种高强度钢板、成形性的技术，应用在炉、热处理设备、制造工具等方向，能够解决加热时间长、钢板氧化等问题，达到成形载荷减小的效果

Active Publication Date: 2014-04-16
KOBE STEEL LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology has manufacturing problems such as significant oxidation of the steel sheet during heating, and the heating time is long, and cooling must be controlled. Therefore, it is required to develop a technology that can achieve both load reduction and high strength in a lower temperature range.

Method used

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  • High strength steel plate with excellent warm and room-temperature formability and warm forming method thereof
  • High strength steel plate with excellent warm and room-temperature formability and warm forming method thereof
  • High strength steel plate with excellent warm and room-temperature formability and warm forming method thereof

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Embodiment Construction

[0039] As mentioned above, the present inventors focused on the TRIP steel sheet containing bainitic ferrite and retained austenite (γR) having an underlying structure (matrix) with a high dislocation density, as in the above-mentioned prior art, in order to secure Room temperature strength, while improving not only the formability at room temperature, but also further improving the forming load reduction effect in the warm state, and further repeated research.

[0040] The inventors of the present invention believe that in order to further improve the forming load reduction effect in the warm state, it is effective to use the TRIP phenomenon (from residual Transformation of austenite to martensite) is suppressed by increasing the amount of solid solution N, thereby reducing the strength in the warm state (the above-mentioned temperature range of 100 to 250°C).

[0041] Specifically, it was found that in order to achieve both high strength at room temperature and an improvemen...

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Abstract

A high-strength steel plate has a component composition including, in mass%, C: 0.02-0.3%, Si: 1-3%, Mn: 1.8-3%, P: 0.1% or less, S: 0.01% or less, Al: 0.001-0.1%, N: 0.002-0.03%, the rest consisting of iron and impurities. The steel plate has a structure including, in terms of area ratio relative to the entire structure, each of the following phases: bainitic ferrite: 50-85%; retained gamma: 3% or greater; martensite + the aforementioned retained gamma: 10-45%; and ferrite: 5-40%. The C concentration (C[gamma]R) in the aforementioned retained austenite is 0.3-1.2 mass%, part or all of the N in the aforementioned component composition is solid solution N, and the amount of the solid solution N is 30-100 ppm.

Description

technical field [0001] The present invention relates to a high-strength steel sheet excellent in formability at room temperature and in a warm state and a warm-state forming method thereof. In addition, the high-strength steel sheet of the present invention includes a cold-rolled steel sheet, a hot-dip galvanized steel sheet, and an alloyed hot-dip galvanized steel sheet. Background technique [0002] Thin steel sheets used in automobile frame parts are required to be high-strength in order to improve crash safety and fuel efficiency. Therefore, it is required to increase the strength of the steel sheet to a level of 980 MPa or more, and at the same time to ensure press formability. In high-strength steel sheets of the 980 MPa class or higher, it is known that it is effective to use a steel that utilizes the TRIP effect in order to achieve both high strength and secure formability (for example, refer to Patent Document 1). [0003] The above-mentioned Patent Document 1 dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00B21D22/20C22C38/06C22C38/58C21D9/46
CPCC21D2211/008C22C38/14C22C38/002B21D22/208C21D2211/001C22C38/04C21D9/46C22C38/12C22C38/001C21D8/0236C22C38/02C21D8/0226C22C38/06C22C38/16C22C38/08C22C38/38C21D2211/002
Inventor 村上俊夫柿内艾丽佳畠英雄水田直气浅井达也
Owner KOBE STEEL LTD
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