Hot stamp moulded body

A formed body and hot stamping technology, applied in the field of high-strength steel sheets and hot stamped bodies, can solve problems such as difficulty in ensuring tensile strength, and achieve the effects of improving collision resistance, hydrogen embrittlement resistance, and collision resistance.

Inactive Publication Date: 2019-09-03
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the central part of the plate thickness is made into a composite structure, the upper limit of the tensile str

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0162] Example

[0163] Next, examples of the present invention will be described. The conditions in the examples are an example of conditions used to confirm the practicability and effects of the present invention, and the present invention is not limited to this example of conditions. The present invention can adopt various conditions as long as it does not deviate from the gist of the present invention and achieves the purpose of the present invention.

[0164] In this example, the hardness of the steel sheet after hot stamping was measured by the above-mentioned method, and the hardness of the central part of the plate thickness and the change of the hardness in the thickness direction of the surface layer ΔH were calculated. 1 、The change of the hardness in the thickness direction of the middle layer ΔH 2 .

[0165] In addition, a tensile test of the steel sheet after hot stamping was performed. The tensile test is to prepare a No. 5 test piece described in JIS Z 2201, and impl...

Example Embodiment

[0176] [Example A]

[0177] After grinding the surface of the base material steel sheet with the chemical composition shown in Table 1 to remove the surface oxides, the surface layer with the chemical composition shown in Table 2 is laminated on both sides or one side by arc welding Use steel plate. In addition, the total thickness of the surface layer steel plate and the base material steel plate after arc welding is set to 200 mm to 300 mm, and the thickness of the surface layer steel plate is set to about 1 / 3 of the thickness of the base material steel plate (in the case of one side, it is About 1 / 4). Production No. 1 to 36 and 38 to 40 are steels with surface layer steel plates welded on both sides, and production No. 37 is steel with surface layer steel plates welded on only one side. The laminated steel sheet was subjected to hot rolling and / or cold rolling shown in Table 3, and the resulting steel sheet was subjected to the heat treatment shown in Table 3, and hot stampe...

Example Embodiment

[0195] [Example B (Mn: 1.50% or more and less than 3.00%)]

[0196] After grinding the surface of the base material steel plate with the chemical composition shown in Table 5 to remove the surface oxides, the surface layer with the chemical composition shown in Table 6 is laminated on both sides or one side by arc welding Use steel plate. In addition, the total thickness of the surface layer steel plate and the base material steel plate after arc welding is set to 200 mm to 300 mm, and the thickness of the surface layer steel plate is set to about 1 / 3 of the thickness of the base material steel plate (in the case of one side, it is About 1 / 4). Production No. 101 to 135 and 137 to 139 are steels with surface layer steel plates welded on both sides, and production No. 136 is steel with surface layer steel plates welded on only one side. The laminated steel sheet was subjected to hot rolling and / or cold rolling shown in Table 7, and the obtained steel sheet was subjected to the he...

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Abstract

Provided is a hot stamp moulded body which is characterized by: including a plate thickness central portion, and a surface layer provided to one or both sides of the plate thickness central portion; and further including intermediate layers formed next to and between the plate thickness central portion and the respective surface layers. The hot stamp moulded body is further characterized in that:the plate thickness central portion has a prescribed composition; the hardness of the plate thickness central portion is at least 500 Hv, but not more than 800 Hv; the variation delta H1 in hardness in the surface layers in the plate thickness direction is at least 10 Hv, but less than 200 Hv; and the variation delta H2 in hardness in the intermediate layers in the plate thickness direction is atleast 50 Hv, but less than 200 Hv.

Description

technical field [0001] The present invention relates to high-strength steel sheets used in automobiles, structural members of structures, and reinforcement members that require strength, and particularly to hot-stamped formed products that are excellent in crash resistance and hydrogen embrittlement resistance. Background technique [0002] In recent years, from the viewpoint of environmental protection and resource saving, the weight reduction of automobile bodies has been demanded, so the application of high-strength steel sheets to automotive components is accelerating. However, since the formability of the steel sheet deteriorates along with the increase in strength of the steel sheet, the formability of a member having a complicated shape becomes a problem in the high-strength steel sheet. [0003] In order to solve such problems, the application of hot stamping in which steel sheets are heated to a high temperature in the austenite region and then press-formed is progr...

Claims

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Application Information

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IPC IPC(8): C22C38/00C22C38/60B21D22/20B21D22/26C21D1/18C21D9/00C21D9/46
CPCC21D1/18C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/002C21D9/0068C21D2211/001C21D1/673C21D9/48C21D8/005C21D8/041C21D8/0426C21D8/0436C21D1/02C21D8/0463C21D2251/02C23C2/02C23C2/06C23C2/26C23C2/28C23C2/40C23C8/02C23C8/80C23C8/22B21D22/26C21D9/46C22C38/60B21D22/20B21D22/022B32B15/01C22C38/001C21D9/00C22C38/00Y10T428/12757C23C30/00Y10T428/2495B32B15/043Y10T428/26B32B15/18B32B15/04Y10T428/12972Y10T428/12799Y10T428/24942Y10T428/12965B32B15/011Y10T428/12958Y10T428/24983Y10T428/24959C23C30/005
Inventor 户田由梨虻川玄纪前田大介匹田和夫藤中真吾
Owner NIPPON STEEL CORP
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