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high strength steel plate

A high-strength steel plate and plate thickness technology, applied in the direction of metal material coating process, metal layered products, heat treatment furnace, etc., can solve the problems of processability deterioration and achieve the effect of improving bendability and bending load

Active Publication Date: 2022-05-24
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In general, when the strength of a steel sheet increases, the workability deteriorates

Method used

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Examples

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Effect test

Embodiment

[0181] Hereinafter, specific examples of the present invention will be described using examples. However, the present invention is not limited to the following examples.

[0182] The cast slabs having the component compositions described in Tables 1-1 and 1-2 were heated to the slab heating temperatures described in Tables 2-1 to 2-3 under the conditions described in Tables 2-1 to 2-3 For hot rolling, coiling. The obtained hot-rolled steel sheet was pickled under the conditions described in Tables 2-1 to 2-3, and used for cold rolling.

[0183] Next, the obtained cold-rolled steel sheets were subjected to annealing treatment under the conditions described in Tables 2-1 to 2-3, some steel sheets were subjected to hot-dip galvanizing by a conventional method, and a portion of the plated steel sheets were further subjected to conventional methods. Alloying treatment is carried out.

[0184] Tables 3-1 to 3-3 show the results of determining the area ratio by identifying the com...

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Abstract

The present invention provides a high-strength steel sheet with improved workability, bending load, and bendability. This high-strength steel plate has a central part of the thickness and soft surface parts formed on one or both sides of the central part of the thickness. The metal structure of the central part of the thickness is composed of tempered martensite: 85% or more, One or more of ferrite, bainite, pearlite, and retained austenite: less than 15% in total and quenched martensite: less than 5%, the metal structure of the soft surface layer is In terms of area ratio, one or more of ferrite: 65% or more, pearlite: 5% or more and less than 20%, tempered martensite, bainite, and retained austenite: the total is less than 10% and quenched martensite: less than 5% composition, the average distance between pearlite in the soft surface layer is 3 μm or more, the Vickers hardness (Hc) in the center of the plate thickness and the Vickers hardness in the soft surface layer (Hs) satisfies 0.50≤Hs / Hc≤0.75.

Description

technical field [0001] The present invention relates to high strength steel sheets. Background technique [0002] In recent years, from the viewpoint of improving the fuel efficiency of automobiles, which is related to environmental preservation, there has been a demand for high strength and thinning of steel sheets for automobiles, and weight reduction of vehicle bodies. In general, when the strength of a steel sheet increases, the workability deteriorates. However, improvement in workability such as hole expandability and ductility is also required for high-strength steel sheets used for frame-based components of automobiles in recent years. In addition, in the processing of high-strength steel sheets, bending is mainly used, and good bendability is also important. [0003] However, in the bending process of the steel sheet, tensile stress is applied to the outer peripheral surface layer portion of the bending in the circumferential direction, while compressive stress is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/60
CPCC21D9/46C23C2/06C23C2/40C22C38/02C22C38/04C22C38/06C22C38/001C22C38/002C22C38/18C22C38/12C22C38/14C22C38/16C22C38/08C22C38/005C22C38/22C22C38/32C22C38/28C22C38/26C22C38/38C22C38/34B32B15/013C21D8/021C21D8/0226C21D8/0263C21D8/0236C21D8/0273C21D8/041C21D8/0426C21D8/0436C21D8/0463C21D8/0473C21D1/02C21D1/19C21D1/25C21D2211/008C21D2211/005C21D2211/009C21D2211/001C21D2211/002C21D8/0278C21D8/0478C21D1/76C21D8/0457C21D8/0257C23G1/081C23G1/08C22C38/58C22C38/42C22C38/44C22C38/60C21D6/004C21D6/005C21D6/008C21D8/0205
Inventor 中野克哉竹田健悟川田裕之
Owner NIPPON STEEL CORP
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