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Method for producing ultra high strength member and use of ultra high strength member

An ultra-high-strength, manufacturing method technology, applied in the direction of manufacturing tools, forming tools, furnace types, etc., can solve the problems of increased risk of delayed failure, large steel plates, deformation residual stress, etc., and achieve the effect of inhibiting the intrusion of hydrogen

Active Publication Date: 2014-07-30
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, when manufacturing auto parts by the hot press method, trimming of the outer periphery by punching for trimming the shape of the part after processing, punching and drilling for assembly (hereinafter, these processes are collectively referred to as punching) ), the punching process after hot pressing brings large deformation and residual stress to the steel plate, which significantly increases the risk of delayed failure in use

Method used

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  • Method for producing ultra high strength member and use of ultra high strength member
  • Method for producing ultra high strength member and use of ultra high strength member
  • Method for producing ultra high strength member and use of ultra high strength member

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach ＞

[0055] First, a first embodiment of the present invention will be described.

[0056] [Manufacturing method]

[0057] figure 1 It is a conceptual diagram showing the method of manufacturing an ultrahigh-strength component according to the first embodiment of the present invention. figure 1 In , the symbol 1 represents the steel plate which is a raw material, and the symbol 2 represents the coil obtained by coiling the steel plate 1. This steel plate will be described later.

[0058] The manufacturing method of the ultra-high-strength parts of the present embodiment, such as figure 1 As shown, the hot press forming step A, the punching step B, and the first heat treatment step C are sequentially performed to obtain the target ultrahigh-strength part TW.

[0059] In the above-mentioned hot press forming process A, a steel plate 1 of a desired length is cut out from the coil 2 of the steel plate 1 (conveyor and cutting machine are not shown), and the workpiece WK composed of ...

no. 2 approach ＞

[0083] Next, a second embodiment of the present invention will be described.

[0084] [Production method]

[0085] Figure 4 It is a conceptual diagram showing a method of manufacturing an ultrahigh-strength component according to a second embodiment of the present invention. In addition, in Figure 4 , for and in the first embodiment figure 1The same components, the same process, etc. are assigned the same symbols.

[0086] The manufacturing method of the ultra-high-strength parts of the second embodiment, such as Figure 4 As shown, after the hot press forming step A, the punching step B, and the first heat treatment step C of the first embodiment were performed, the chemical conversion treatment and the electrophoretic coating step D were further performed. Therefore, since the hot press forming step A, the punching step B, and the first heat treatment step C are the same as those described in the method of the first embodiment, descriptions of these steps A to C are o...

no. 3 approach ＞

[0113] Next, a third embodiment of the present invention will be described.

[0114] [Manufacturing method]

[0115] Figure 5 It is a conceptual diagram showing a method of manufacturing an ultrahigh-strength component according to a third embodiment of the present invention. In addition, in Figure 5 , for and in the first embodiment figure 1 The same components, the same process, etc. are assigned the same symbols.

[0116] The manufacturing method of the ultra-high-strength component of the third embodiment is as follows Figure 5 As shown, steps A to C are the same as the manufacturing method of the above-mentioned first embodiment, but the point of reheating by performing the second heat treatment step D after the first heat treatment step C is the same as the manufacturing method of the first embodiment different.

[0117] The second heat treatment step D is to heat the workpiece WK temporarily heat-treated in the first heat treatment step C at a third heating tem...

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Abstract

The present invention provides a method for manufacturing and using an ultra-high-strength component, which can manufacture ultra-high-strength components by hot pressing with excellent delayed fracture resistance at low cost, and the tensile strength TS is 1180 MPa or more. A method for manufacturing an ultra-high-strength component, heating a steel plate at a first heating temperature in the temperature range of 700 to 1000°C, forming it into a part shape at the first heating temperature, starting to cool at the same time, and finishing the cooling Afterwards, perform punching and shearing processing according to the target shape, and after the punching and shearing processing, perform heating at a second heating temperature in the temperature range of not less than 100°C and less than 300°C, and the holding time at the second heating temperature is After the first heat treatment for 1 second to 60 minutes, the tensile strength of the obtained ultra-high-strength component is 1180 MPa or more.

Description

technical field [0001] The present invention relates to a method of manufacturing and a method of using an ultra-high-strength component suitable for automobile frame components, reinforcement components, etc., and excellent in delayed failure resistance. Background technique [0002] In recent years, from the viewpoint of protecting the global environment, it is required to improve the fuel consumption of automobiles. In addition, from the viewpoint of protecting passengers in the event of a vehicle collision, it is also required to improve the safety of the vehicle body. Therefore, in order to satisfy both the improvement of fuel efficiency and the improvement of safety, researches are being actively carried out for both weight reduction and strengthening of automobile bodies. [0003] In order to simultaneously reduce the weight and strengthen the automobile body, it is effective to increase the strength and thin the wall of the raw material of the parts. Recently, as au...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/00B21D22/20B21D24/16C21D1/18C21D9/46C22C38/00C22C38/60
CPCC21D2211/008C22C38/14C22C38/04C21D9/46B21D37/16C22C38/001C21D8/0436B21D24/16C22C38/06C21D8/04C21D2211/005C21D9/0062B21D35/001C21D2211/001C22C38/002C21D8/005B21D28/243B21D22/02C21D8/0426C22C38/02C21D9/0068B21D22/022C21D1/673C25D5/36C21D1/18B21D22/20C21D1/00
Inventor 田路勇树长谷川浩平
Owner JFE STEEL CORP