High strength steel sheet and manufacturing method therefor

A high-strength steel plate and a manufacturing method technology, applied in manufacturing tools, furnaces, heat treatment equipment, etc., can solve problems such as insufficient punching properties, and achieve the effects of excellent punching properties and extended flange properties

Active Publication Date: 2017-11-28
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] In addition, in the steel sheets described in Patent Documents 2 to 5, although a certain improvement was observed in stretch flangeability and burring workability, there was a problem that punchability was not sufficient.

Method used

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  • High strength steel sheet and manufacturing method therefor
  • High strength steel sheet and manufacturing method therefor
  • High strength steel sheet and manufacturing method therefor

Examples

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Embodiment

[0152] Next, the present invention will be described more specifically based on examples. The following examples illustrate preferred examples of the present invention, and the present invention is not limited to these examples.

[0153] After heating the slabs with the composition shown in Table 1, they were hot-rolled under the conditions shown in Table 2 to manufacture hot-rolled steel sheets. In addition, some steel sheets were further processed at the thickness reduction rates described in Table 2. Test pieces were collected from each obtained hot-rolled steel sheet, and the structure and mechanical properties were evaluated by the methods described below. Table 3 shows the evaluation results of each item.

[0154] [Ferrite Area Fraction]

[0155] Follow the steps below to evaluate the ferrite area fraction. First, a steel plate thickness cross section parallel to the rolling direction of the steel plate was etched with nital to exhibit a microstructure, thereby obtai...

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PUM

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Abstract

The purpose of the present invention is to provide: a high strength steel sheet that has high strength such that tensile strength is at least 780 MPa, and excellent blanking quality combined with stretch-flangeability; and a manufacturing method therefor. Provided is a high strength steel sheet wherein: the steel sheet contains, in mass%, C: 0.05-0.30%, Si: 0.6-2.0%, Mn 1.3-3.0%, P: not more than 0.10%, S: not more than 0.030%, Al: not more than 2.0%, N: not more than 0.010%, and one or more of Ti, Nb and V: 0.01-1.0% each, the balance being obtained from iron and unavoidable impurities; the steel sheet comprises at least 50% area ratio of ferrite structure; the amount of Fe deposited is at least 0.04 mass%; the steel sheet contains a deposit in which the particle diameter is less than 20 nm; and C* defined by expression (1) and C*p defined by expression (2) satisfy the conditions in expressions (3)-(5). C*=([Ti]/48+[Nb]/93+[V]/51+[Mo]/96+[Ta]/181+[W]/184) * 12... (1) C*p=([Ti]p/48+[Nb]p/93+[V]p/51+[Mo]p/96+[Ta]p/181+[W]p/184)*12... (2) C* >= 0.035... (3) -0.015 <=[C]-C* <= 0.03... (4) C*p/C* >=0.3... (5)

Description

technical field [0001] The present invention relates to a high-strength steel plate, in particular to components suitable for running parts such as lower arms of automobiles, framework components such as pillars and members and their reinforcing components, and door impact beams High-strength steel plate that combines strength, punchability, and stretch flangeability for structural members used in sheet members, vending machines, tables, home appliances, OA equipment (office automation equipment), building materials, etc. Furthermore, the present invention relates to a method for manufacturing the high-strength steel sheet. Background technique [0002] In recent years, with increasing concern for the global environment, it is desired to reduce CO in manufacturing 2 There is an increasing demand for the usage of steel sheets with a large amount of discharge. In addition, in the field of automobiles, there is an increasing demand for reducing the body weight while maintaini...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/14C22C38/60
CPCC22C38/00C22C38/14C22C38/60C21D9/46C21D8/0205C21D8/0226C21D2211/005C22C38/06C22C38/12C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58C22C38/04C22C38/005C22C38/02C21D8/0247
Inventor 木津太郎丰田俊介木户章雅田谷哲志
Owner JFE STEEL CORP
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