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High-strength, high-young's modulus steel plate, and manufacturing method thereof

A technology of Young's modulus and manufacturing method, which is applied in the field of high-strength and high Young's-modulus steel plate and its manufacturing field, can solve the problems such as the decrease of rigidity of the vehicle body, and achieve the effect of improving the fuel consumption rate.

Active Publication Date: 2016-04-06
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reduction in body rigidity due to thinning has become a problem, and it is necessary to increase the rigidity of structural parts of automobiles

Method used

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  • High-strength, high-young's modulus steel plate, and manufacturing method thereof
  • High-strength, high-young's modulus steel plate, and manufacturing method thereof
  • High-strength, high-young's modulus steel plate, and manufacturing method thereof

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Embodiment 1

[0212] Next, examples of the first embodiment will be described. It should be noted that the present invention is not limited to this embodiment.

[0213] Steel having the composition shown in Table 1, with the balance being Fe and unavoidable impurities was melted in a converter and cast into slabs by continuous casting. The obtained slabs were hot-rolled under the conditions shown in Table 2, and then the obtained hot-rolled sheets were pickled. Next, cold rolling was carried out under the conditions shown in Table 2, and thereafter, heating (first annealing) and reheating (second annealing) shown in Table 2 were performed to produce cold-rolled steel sheets (CR: cold-rolled steel sheets (uncoated)). A part of the cold-rolled steel sheet is reheated (secondary annealing), and then hot-dip galvanized (GI: hot-dip galvanized steel sheet). In addition, a part of the cold-rolled steel sheet is reheated (secondary annealing), then hot-dip galvanized, and then further alloyed (...

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Abstract

Provided is a high-strength, high-Young's modulus steel plate having a 780MPa or greater TS, a 205GPa or greater Young's modulus in the rolling direction and in a direction 45 DEG relative to the rolling direction, a 220GPa or greater Young's modulus in the direction orthogonal to the rolling direction, a 1.05 or greater average r value, and a 2.03 or greater limit draw ratio (LDR). This high-strength, high-Young's modulus steel plate contains, in mass%, C:0.060-0.150%, Si:0.50-2.20% and Mn:1.00-3.00%, further contains one or two of Ti:0.001-0.200% and Nb: 0.001-0.200%, has a content of solid solution C (C*) that is calculated with a prescribed expression on the basis of the C, N, S, Ti and Nb content and satisfies expression (1) below, and has a microstructure having a ferrite area ratio of 20% or greater, a martensite area ratio of 5% or greater, a ferrite average crystal grain diameter of 20.0[mu]m or less, and an inverse intensity ratio of [gamma]-fibers to [alpha]-fibers of 1.00 or greater in each of the ferrite and martensite. 500 <= C* <= 1300 ... (1) Here, the unit of C* is mass [ppm].

Description

technical field [0001] The present invention mainly relates to a high-strength high Young's modulus steel plate suitable for providing structural parts of automobile bodies and a method of manufacturing the same. Background technique [0002] In recent years, due to increased interest in global environmental issues, and the demand for emission control of automobiles, the weight reduction of automobile bodies has become an extremely important issue. In order to reduce the weight of the vehicle body, it is an effective method to reduce the thickness of the steel plate (thinning) by utilizing the high strength of the steel plate. Recently, as a result of remarkable advances in the strengthening of steel sheets, there is a tendency to actively use thin steel sheets having a tensile strength TS of 780 MPa or more and a sheet thickness of less than 2.0 mm. However, the decrease in the rigidity of the vehicle body due to thinning has become a problem, and it is necessary to increa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00B21B1/22B21B3/00C21D9/46C22C38/14C22C38/58C23C2/02C23C2/06C23C2/28C22C18/00
CPCC23C2/02C23C2/06C23C2/28C22C18/00C22C38/00C22C38/14B32B15/013C22C38/001C22C38/002C22C38/005C22C38/008C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/16C22C38/18C22C38/34C22C38/38C22C38/60C21D8/0236C21D8/0247C21D2211/005C21D2211/008C21D9/46C21D6/004C21D6/005C21D6/008C21D8/0205C21D8/0221C21D8/0226C21D8/0263C21D8/0273C22C38/22C22C38/26C22C38/28C23C2/024C23C2/0224C23C2/40
Inventor 南秀和横田毅濑户一洋
Owner JFE STEEL CORP
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