High-strength steel plate with excellent impact resistance and manufacturing method of same

A technology of high-strength steel plate and impact resistance, applied in the field of high-strength steel plate and its manufacturing, can solve problems such as high-strength limitation, and achieve the effect of improving impact resistance.

Active Publication Date: 2013-09-11
KOBE STEEL LTD
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  • Abstract
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Problems solved by technology

In this case, in order to increase the absorbed energy at a low strain rate, the static strength of the

Method used

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  • High-strength steel plate with excellent impact resistance and manufacturing method of same
  • High-strength steel plate with excellent impact resistance and manufacturing method of same
  • High-strength steel plate with excellent impact resistance and manufacturing method of same

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Example Embodiment

[0021] The steel sheet of the present invention has a two-phase structure composed of a predetermined amount of a martensite phase and the remainder is substantially a ferrite phase, and the hardness ratio of the two phases or, furthermore, the amount of solid solution C in the ferrite is adjusted to the above The predetermined value, by limiting the chemical composition (% by mass) to the following range, can effectively improve the impact resistance without deteriorating various properties such as press formability.

[0022] It contains C: 0.05 to 0.20%, Si: 2.0% or less, Mn: 0.3 to 3.0%, P: 0.1% or less, and Al: 0.1% or less, with the balance being composed of Fe and inevitable impurities.

[0023] Or, in addition to the basic components, it further contains any one or more of [Mo: 1.0% or less, Cr: 2.5% or less, B: 0.002% or less], and / or [Ti, Nb, Zr, V: The total amount is at least one of 0.4% or less, Cu: 2.5% or less, Ni: 1.5% or less, and Ca: 0.02% or less].

[0024] Hereina...

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Abstract

The invention provides a high-strength steel plate with excellent impact resistance in case of no harm to stamping formability and a manufacturing method of the same. The high-strength steel plate is characterized by being composed of the following components in percentage by mass: 0.05-0.20% of C, less than 2.0% of Si, 0.3-3.0% of Mn, less than 0.1% of P, less than 0.1% of Al, and the balance of Fe and inevitable impurities, and has the two phase structures of a martensite phase and the balance of substantially ferritic phase, wherein the volume fraction of the martensite phase is 5-30%; and the ratio Hv(M)/Hv(F) of the hardness Hv(M) of the martensite phase to the hardness Hv(F) of the ferritic phase is 2.4-4.5.

Description

technical field [0001] The present invention relates to a high-strength member suitable for, for example, a steel plate for automotive parts, which requires excellent formability during stamping and requires excellent protection against impacts such as collisions when the vehicle is running, that is, impact resistance. Steel plate and its manufacturing method. Background technique [0002] In recent years, the weight reduction of the vehicle body has been achieved mainly by increasing the strength of the steel plate and reducing the thickness of the plate. As a conventional method for increasing the strength of steel sheets for automobiles, for example, there is a method disclosed in Japanese Patent Laid-Open No. 57-41849, that is, adding P to carbide-forming elements such as Nb and Ti at low C. , Si and other solid solution strengthening elements. In addition, JP-A-60-52528 discloses a method of obtaining a high-strength steel sheet excellent in ductility by precipitating...

Claims

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Application Information

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IPC IPC(8): C22C38/00C22C38/04C21D8/02
Inventor 内海幸博梶原桂村上俊夫北村充田村享昭冈野洋一郎渡边宪一
Owner KOBE STEEL LTD
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