Hot rolled steel sheet having superior hot press forming property and high tensile strength, formed article using the steel sheet and method for manufacturing the steel sheet and the formed article

A high-tensile strength, hot-press forming technology, applied in the field of hot-rolled steel sheets, can solve the problems of expensive cold-rolled steel sheets, high cost burden, and low productivity.

Inactive Publication Date: 2010-12-08
POHANG IRON & STEEL CO LTD
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  • Abstract
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Problems solved by technology

[0004] However, this hot press forming method has a problem in that the cost burden is necessarily high becau

Method used

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  • Hot rolled steel sheet having superior hot press forming property and high tensile strength, formed article using the steel sheet and method for manufacturing the steel sheet and the formed article
  • Hot rolled steel sheet having superior hot press forming property and high tensile strength, formed article using the steel sheet and method for manufacturing the steel sheet and the formed article
  • Hot rolled steel sheet having superior hot press forming property and high tensile strength, formed article using the steel sheet and method for manufacturing the steel sheet and the formed article

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Embodiment approach

[0054] Exemplary embodiments of the present invention will be described in more detail hereinafter.

Embodiment

[0056] Steel ingots having the compositions listed in Table 1 below were prepared by vacuum induction melting. Herein, the prepared steel ingot has a thickness of 60 mm and a width of 175 mm. The steel ingot was reheated at 1200° C. for 1 hour, and hot rolled so that its hot rolled thickness was 1.6 mm. The hot rolling termination temperature is higher than the Ar3 transformation point. Then, the hot coiling process was simulated by cooling the reheated ingot to the desired hot coiling temperature at ROT cooling rates of 5°C / s and 50°C / s, keeping the cooled ingot In a furnace preheated to 400-650°C for 1 hour and cool the ingot in the furnace. The hot press forming simulation was performed using a dilatometer by cooling a steel ingot at a cooling rate of 20°C / s, and measuring the hardness of the steel ingot to calculate the tensile strength of the steel ingot. The results are listed in Table 2 below.

[0057]Among the steels listed in Table 1 below, Steels 1, 2, and 3 fall...

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Abstract

There are provided a hot rolled steel sheet that has superior hot press forming property and high tensile strength and is used for structural members and their parts of automobiles and the like, a formed article, and a method for manufacturing the hot rolled steel sheet and the formed article. The hot rolled steel sheet having superior hot press forming property and high tensile strength includes, by weight: C: 0.1 to 0.5%, Mn: 1.0 to 3.0%, Si: 0.5% or less, W: 0.1% or less, N: 0.01 to 0.1%, Al: 0.01 to 0.1%, S: 0.03% or less, P: 0.1% or less and B: 0.001 to 0.01%, at least one element selected from the group consisting of Ti: 0.001 to 0.1%, Nb: 0.001 to 0.1% and V: 0.001 to 0.1%, at least one element selected from the group consisting of Mo: 0.01 to 1.5%, Cr: 0.01 to 1.5%, Cu: 0.005 to 1.0% and Ni: 0.005-2.0%, and the balance of iron (Fe) and other inevitable impurities, wherein a structure of the hot rolled steel sheet includes 10% or less of proeutectoid ferrite, 10% or less of pearlite and the balance of bainite, or includes 10% or less of proeutectoid ferrite, 10% or less of pearlite and the balance of bainite and martensite.

Description

technical field [0001] The present invention relates to a hot-rolled steel sheet for structural parts of automobiles or parts thereof, etc., and a method for preparing the hot-rolled steel sheet, and more particularly, to a hot-rolled steel sheet having excellent hot-press formability and high tensile strength A hot-rolled steel sheet, a shaped product using the hot-rolled steel sheet, and a method for producing the hot-rolled steel sheet and the shaped product. Background technique [0002] Recently, the automotive industry has produced lighter-weight automotive structures and components thereof with high tensile strength in order to comply with environmental regulations and ensure passenger safety. Therefore, an attempt has been made to develop a method for producing a steel sheet having excellent formability and high tensile strength with the aim of providing the steel sheet with high tensile strength. [0003] In order to achieve the excellent formability and high tensi...

Claims

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Application Information

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IPC IPC(8): C22C38/00
CPCC22C38/04C21D8/0426C21D2211/008C22C38/06C21D9/48C21D2211/005C21D2211/004C22C38/001C21D2211/002
Inventor 李昌勋河元朴哲载全在春柳在和
Owner POHANG IRON & STEEL CO LTD
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