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Hot stamping parts and manufacturing method thereof

A technology for hot stamping and parts, applied in the field of hot stamping parts and their manufacturing, can solve the problems of brittle fracture of high-toughness steel components, threatening the safety of drivers, etc.

Active Publication Date: 2021-12-03
HYUNDAE STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, when a side collision occurs, the high-toughness steel member used as a collision energy absorber can undergo brittle fracture, threatening the safety of the driver

Method used

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  • Hot stamping parts and manufacturing method thereof
  • Hot stamping parts and manufacturing method thereof
  • Hot stamping parts and manufacturing method thereof

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Embodiment approach

[0026] Hereinafter, the present invention will be described in detail. In the following description of the present invention, when it is considered that the detailed description of related known technologies or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

[0027] Terms described below are terms defined in consideration of functions in the present invention, and may vary according to user or operator's intention or practice. Therefore, these terms should be defined based on the contents of the entire specification describing the present invention.

[0028] In this specification, the term "hot-rolled decarburized layer" refers to a decarburized layer formed in steel by a hot rolling process including the steps of hot rolling, cooling, and coiling. Even after the cooling process is completed, the hot-rolled decarburization layer can remain in the steel. For example, after the cold rolling, annea...

Embodiment

[0085] Hereinafter, constitutions and effects of the present invention will be described in more detail with reference to preferred embodiments. However, these examples are shown as preferred examples of the present invention, and should not be construed as limiting the present invention in any way.

[0086] The steel slab containing the composition shown in Table 1 below (satisfying the composition range of the embodiment of the present invention) and the balance of iron (Fe) and unavoidable impurities was reheated at a temperature of 1200° C., and then according to the following Table 2 The hot rolling process was carried out under the process conditions shown, thereby preparing the samples of Comparative Examples 1 to 4 and Examples 1 to 4. More specifically, comparative examples 1 to 4 were prepared using a water-based cooling method under the following process conditions: finishing temperature (FDT) 884°C-889°C, coiling temperature (CT) 555°C-643°C. That is, after finish...

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Abstract

A method for manufacturing a hot stamping steel according to an embodiment, the method comprising the steps of: reheating a steel billet at a temperature of 1200° C. to 1250° C., the steel billet containing 0.20 wt. % to 0.50% by weight of carbon (C), 0.05% by weight to 1.00% by weight of silicon (Si), 0.10% by weight to 2.50% by weight of manganese (Mn), 0 to 0.015% by weight (excluding 0) of phosphorus (P) , 0-0.005 wt% (excluding 0) of sulfur (S), 0.05 wt%-1.00 wt% of chromium (Cr), 0.001 wt%-0.009 wt% of boron (B), 0.01 wt%-0.09 wt% Titanium (Ti), and the balance of iron (Fe) and unavoidable impurities; finish rolling the reheated billet at a temperature of 880 ° C to 950 ° C; perform anhydrous cooling on the hot rolled steel plate, The cooled steel plate is then wound at a temperature of 680°C to 800°C to form a hot-rolled decarburized layer on its surface; the wound steel plate is pickled and then cold-rolled; annealing the rolled steel material; plating the annealed steel material; and hot stamping the plated steel material.

Description

technical field [0001] The present invention relates to hot stamping parts and methods for their manufacture. Background technique [0002] The B-pillar is a key component of the car's collision energy absorber, and is mainly made of heat-treated steel corresponding to 150K or higher grade. It plays a very important role in ensuring the driver's living space when a side collision occurs. In addition, when a side collision occurs, the high-toughness steel member used as a collision energy absorber can undergo brittle fracture, threatening the safety of the driver. Therefore, a low-toughness steel member is connected to the lower end of the B-pillar, which is subject to brittle fracture, thereby improving the collision energy absorption capacity of the B-pillar. This steel member is called a steel plate for Tailor-Welded Blank (TWB) applications. Steel sheets for TWB applications are produced through hot and cold rolling processes followed by hot pressing processes such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D35/00B21D22/02B21B3/02B21B37/74C22C38/04C22C38/32C22C38/28C21D8/02C21D9/46
CPCC21D9/46C22C38/04C22C38/28C22C38/32B21D22/022B21D53/88C22C38/38C22C38/02C21D7/13C21D1/18C21D1/76C21D6/005C21D6/008C21D8/0426C21D8/0436C21D8/0457C21D8/0463C21D1/26C21D1/28C21D1/673C21D1/185C21D2211/008C21D3/04B21D35/005B21B3/02B21B37/74C21D8/0247C21D8/0257C21D8/0205C21D8/0226C21D8/0236C21D9/0081C21D2211/002C21D2211/005C22C38/002C22C38/44C22C38/48C22C38/50C22C38/54C22C38/58
Inventor 刘炳吉都亨侠宋致雄林熙重许盛烈
Owner HYUNDAE STEEL CO LTD