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Heat-hardened steel with excellent crashworthiness and method for manufacturing heat-hardenable parts using same

a technology of heat treatment hardening steel and high strength, which is applied in the direction of metal layered products, metal material coating processes, thin material processing, etc., can solve the problems of component brittleness failure, low elongation of 6% to 7%, etc., and achieve high strength, improved crashworthiness, and high strength

Inactive Publication Date: 2014-03-27
HYUNDAE STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The heat-treatment hardening steel in this patent provides a strong and ductile component that can be formed into a high strength component through hot stamping. This results in improved crashworthiness and impact absorption capabilities.

Problems solved by technology

However, components manufactured by this process have a drawback in that such components have a low elongation of 6% to 7% due to microstructures approaching full martensite, which is advantageous for securing high strength.
Such low elongation causes brittleness failure of a component due to insufficient absorption of impact when external impact is applied thereto.

Method used

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  • Heat-hardened steel with excellent crashworthiness and method for manufacturing heat-hardenable parts using same
  • Heat-hardened steel with excellent crashworthiness and method for manufacturing heat-hardenable parts using same
  • Heat-hardened steel with excellent crashworthiness and method for manufacturing heat-hardenable parts using same

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Embodiment Construction

[0086]Next, the present invention will be described in more detail with reference to examples. Here, the following examples are provided for illustration only and should not be construed in any way as limiting the present invention.

[0087]Descriptions of details apparent to those skilled in the art will be omitted.

[0088]1. Preparation of Specimen

[0089]In order to observe heat-treatment hardening properties of steel according to alloy compositions, specimens of Examples 1 to 4 and Comparative Example 1 having compositions as listed in Table 1 and mechanical properties before heat treatment as listed in Table 2 were heated to 900° C., left for 5 minutes, and cooled to 100° C. at an average cooling rate of 50° C. / sec.

TABLE 1(Unit: wt %)CSiMnCrMoAlTiNbBNiSbComparative0.2290.2381.190.1830.00250.030.036—0.002——Example 1Example 10.31.07.50.30.011.50.05—0.003—0.8Example 20.30.43.00.30.012.00.050.010.0052.00.8Example 30.41.55.50.20.010.050.050.050.0033.00.8Example 40.41.76.00.20.012.0—0.100.0...

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Abstract

Disclosed are heat-hardened steel with excellent crashworthiness and a method for manufacturing heat-hardenable parts using the same. The heat-hardened steel according to the invention comprises, based on wt %; C: 0.12-0.8%; Cr: 0.01-2%; Mo: 0.2% or less; B: 0.0005-0.08%; Ca: 0.01 or less; Sb: 1.0% or less; and Ti and / or Nb: 0.2%; and the reminder being Fe and inevitable impurities. In addition, the heat-treatment hardening steel satisfies anyone of following conditions i)-iv), wherein condition i) comprises Si: 0.5-3%; Mn: 1-10% and Al: 0.05-2%; condition ii) comprises Si: 1% or less; Mn: 0.5-5%; Al: 0.1-2.5%; and Ni: 0.01-8%; condition iii) comprises Si: 0.5-3%; Mn: 1-10%; Al: 0.1% or less; and Ni: 0.01-8%; and condition iv) comprises Si: 0.5-3%; Mn: 1-10%; Al: 0.1-2.5%; and Ni: 0.01-8%.

Description

TECHNICAL FIELD[0001]The present invention relates to a technology for manufacturing a high strength component using heat-treatment hardening steel, and more particularly, to heat-treatment hardening steel having high strength and crashworthiness after heat treatment and a method for manufacturing a heat-treatment hardening component using the same.BACKGROUND ART[0002]Recently, automobile components have been developed to be light in weight and to have high strength for improvement of fuel efficiency.[0003]Recently, with the development of techniques for manufacturing automobile components, hot stamping has been developed. Hot stamping is a process of manufacturing a high strength component by quenching to form a martensite microstructure as soon as a material having a tensile strength of about 500 MPa and heated to about 900° C. is formed into a desired shape. Hot stamping may be used to produce high strength components having a tensile strength of 1000 MPa or more.[0004]Steel for ...

Claims

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Application Information

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IPC IPC(8): C21D8/00C22C38/28C22C38/32C22C38/38C22C38/06C22C38/48C22C38/50C22C38/54C22C38/58C22C38/22C22C38/44
CPCC21D8/005C22C38/22C22C38/28C22C38/32C22C38/38C22C38/06C22C38/48C22C38/50C22C38/54C22C38/58C22C38/44C21D6/002C21D6/004C21D8/00C22C38/02C22C38/04C22C38/60C23C2/06C23C2/12B32B15/012B32B15/013C22C38/26C22C38/34C21D7/02C21D1/673Y10T428/12799Y10T428/12757Y10T428/31678C21D6/005C21D6/008C21D8/0247C21D2211/008C21D9/46
Inventor NAM, SEUNG-MANIM, HEE-JOONGLEE, SEUNG-HAKIM, DONG-EUNLEE, BO-RYONGKIM, YOUNG-JINMAN-BEEN, MAN-BEEN
Owner HYUNDAE STEEL CO LTD
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