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High-strength cold-rolled steel plate and method for producing same

A cold-rolled steel sheet and a technology for a manufacturing method, which are applied in the field of high-strength cold-rolled steel sheets and their manufacturing, can solve problems such as delayed fracture of steel sheets, and achieve the effects of excellent delayed fracture resistance and excellent delayed fracture resistance.

Active Publication Date: 2017-10-13
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, steel sheets with a tensile strength (TS) of 1150 MPa or more may suffer from delayed fracture (hydrogen embrittlement) due to hydrogen infiltrated from the service environment.

Method used

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  • High-strength cold-rolled steel plate and method for producing same
  • High-strength cold-rolled steel plate and method for producing same
  • High-strength cold-rolled steel plate and method for producing same

Examples

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Embodiment

[0125] Hereinafter, examples of the present invention will be described. However, the present invention is not limited to the following examples, and may be implemented by appropriately adding changes within the scope of the gist of the present invention, and these are included in the technical scope of the present invention.

[0126] The steel with the composition shown in Table 1 and the rest is composed of Fe and unavoidable impurities is smelted in a converter, and made into a slab by continuous casting. After cooling to room temperature, the obtained slab is reheated to make the hot rolled The starting temperature is 1250°C, and the hot rolling is carried out at the finishing temperature (FDT) shown in Table 2. After making a hot-rolled steel sheet, cooling is started at the cooling start time shown in Table 2. Under the conditions, as the first cooling, after cooling to the primary cooling stop temperature (Tq1) at the first average cooling rate (cooling rate 1) (primary...

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Abstract

Provided are: a high-strength cold-rolled steel plate having a tensile strength (TS) of 1150 MPa or more and excellent elongation and delayed fracture resistance; and a method for producing same. The high-strength cold-rolled steel plate has a component composition comprising, in mass%, 0.16-0.30% of C, 1.20-2.20% of Si, 1.50-2.50% of Mn, 0.05% or less of P, 0.005% or less of S, 0.10% or less of Al, 0.007% or less of N, at least one of Ti and Nb (with the total of Ti + Nb being 0.04-0.15%), and a remainder of Fe and unavoidable impurities. The high-strength cold-rolled steel plate is configured so as to have a composite structure comprising 45-65% by volume fraction of ferrite having an average crystal grain size of 3 [mu]m or less, 35-55% by volume fraction of tempered martensite having an average crystal grain size of 2 [mu]m or less, and 5% or less (including 0%) of non-recrystallized ferrite having an average crystal grain size of 5 [mu]m or less.

Description

technical field [0001] The present invention relates to a high-strength cold-rolled steel sheet and a method for producing the same, and in particular to a high-strength cold-rolled steel sheet suitable as parts of structural components such as automobiles. Background technique [0002] In recent years, due to serious environmental problems, CO 2 Emission regulations are becoming more and more stringent, and in the automotive field, reducing the weight of the vehicle body has become an issue in order to improve fuel efficiency. For this reason, high-strength steel sheets are used for automobile parts to reduce thickness, and steel sheets with a tensile strength (TS) of 1150 MPa or more are gradually being used. In addition, high-strength steel sheets used in structural parts and reinforcement parts of automobiles are also required to have excellent formability. Especially for the molding of parts with complex shapes, excellent elongation properties are required. In additi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/14C22C38/58
CPCC22C38/14C21D8/0236C21D8/0247C22C38/04C22C38/26C22C38/34B32B15/013C21D9/46C21D6/005C21D6/008C21D8/0273C21D2211/005C21D2211/008C22C38/001C22C38/002C22C38/005C22C38/02C22C38/06C22C38/08C22C38/12C22C38/16C22C38/28C22C38/38C21D8/0226C21D2211/004C21D6/001C21D6/002C21D8/0205C21D8/0263
Inventor 高岛克利船川义正
Owner JFE STEEL CORP
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