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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 strength is about 1300 MPa, and it is difficult to ensure the tensile strength of 1500 MPa or more required for hot-pressed parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0163] Next, examples of the present invention will be described. The conditions in the examples are examples of conditions employed to confirm the practicability and effects of the present invention, and the present invention is not limited to the examples of conditions. Various conditions can be employed in the present invention as long as the object of the present invention is achieved without departing from the gist of the present invention.

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

[0165] In addition, a tensile test of the steel sheet after hot stamping was performed. For the tensile test, a No. 5 test piece described in JIS Z 2201 was produced, a...

Embodiment A

[0177]After the surface of the base steel sheet having the chemical composition shown in Table 1 was ground to remove surface oxides, surface layers having the chemical composition shown in Table 2 were laminated on both sides or one side by arc welding. Use a steel plate. In addition, the total thickness of the steel plate for the surface layer and the steel plate for the base material after arc welding is set to 200 mm to 300 mm, and the thickness of the steel plate for the surface layer is set to about 1 / 3 of the thickness of the steel plate for the base material (in the case of one side, 1 / 4 or so). Production Nos. 1 to 36 and 38 to 40 are steels with steel plates welded on both sides, and Production No. 37 is steel with steel plates welded to only one side. The laminated steel sheets were subjected to hot rolling and / or cold rolling as shown in Table 3, and the obtained steel sheets were subjected to the heat treatment shown in Table 3, followed by hot stamping to produc...

Embodiment B

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

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

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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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