Hot press molded article, method for producing same, and thin steel sheet for hot press molding
A technology of hot press forming and manufacturing method, applied in the field of hot press forming products, their manufacturing and thin steel sheets for hot press forming, can solve the problems of increased process, high cost, unreasonable and the like, and achieve the effect of controlling strength and elongation
Active Publication Date: 2014-03-05
KOBE STEEL LTD
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Problems solved by technology
[0011] In the techniques of the above-mentioned non-patent documents 1 and 2, the tensile strength is 600 MPa or less and the elongation is about 12 to 18% on the side of the energy absorbing part, but laser welding (tailored welded blank: TWB) is required in advance, and the process increases and high cost
In addition, it is not preferable from the viewpoint of heat consumption to heat the energy absorbing part that does not need to be quenched originally.
[0012] In the technology of Non-patent Document 3, although 22MnB5 steel is used as the base material, due to the influence of boron addition, the strength after quenching is poor in the robustness of the strength after quenching for heating at the temperature of the two-phase region, and it is difficult to control the strength of the energy absorbing part side. The elongation rate can only get about 15%
[0013] In the technology of Non-Patent Document 4, it is unreasonable to control 22MnB5 steel, which has good hardenability, without quenching (die cooling control) using 22MnB5 steel as the base material.
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[0076] Steel materials having the chemical composition shown in Table 1 below were subjected to vacuum smelting to form experimental slabs, which were then hot-rolled and then cooled and coiled. Then it is cold-rolled to become a thin steel plate. Also, Ac in Table 1 3 The phase transition point and the Ms point are obtained by using the following equations (1) and (2) (for example, refer to "Leslie Steel Materials Science" Maruzen, (1985)).
[0077] Ac 3 Phase transition point (°C) = 910-203 × [C] 1 / 2 +44.7×[Si]-30×[Mn]+700×[P]+400×[Al]+400×[Ti]+104×[V]-11×[Cr]+31.5×[Mo]-20×[ Cu]-15.2×[Ni]...(1)
[0078] Ms point (°C)=550-361×[C]-39×[Mn]-10×[Cu]-17×[Ni]-20×[Cr]-5×[Mo]+30×[Al]...( 2)
[0079] Among them, [C], [Si], [Mn], [P], [Al], [Ti], [V], [Cr], [Mo], [Cu] and [Ni] represent C, Si , Mn, P, Al, Ti, V, Cr, Mo, Cu and Ni content (mass %). In addition, when the elements shown in each of the above formulas (1) and (2) are not included, the calculation is performed with t...
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Abstract
A hot press molded article comprising a thin steel sheet formed by hot press molding is provided. The metal structure includes 80-97 area% of martensite and 3-20 area% of retained austenite, with the remaining structure comprising not more than 5 area%, and therefore the balance between strength and stretching can be kept in an appropriate range, and high ductility can be achieved.
Description
technical field [0001] The present invention relates to a hot-press formed product with required strength used as a structural member of an automobile part, a manufacturing method thereof, and a thin steel sheet for hot-press forming. A hot press formed product having a predetermined strength obtained by performing heat treatment while imparting a shape, a method for producing such a hot press formed product, and a thin steel sheet for hot press forming. Background technique [0002] As one of the measures to improve the fuel efficiency of automobiles due to global environmental problems, the weight reduction of automobile bodies is promoted, and it is necessary to make the steel plates used in automobiles as high as possible. However, if the strength of the steel sheet is increased to reduce the weight of the automobile, the elongation EL and the r value (Lankford value) will decrease, and the press formability and shape freezing properties will deteriorate. [0003] In or...
Claims
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IPC IPC(8): C22C38/00B21D22/20C21D1/18C21D9/00C22C38/60
CPCC22C38/32C22C38/54C21D2211/008C22C38/14C22C38/22C22C38/04C22C38/28C22C38/001B21D37/16C22C38/02C22C38/50B21D22/022C22C38/20C22C38/26C22C38/06C22C38/58C21D1/673B21D22/22C22C38/24B21D22/208C21D1/18C21D9/00C22C38/60
Inventor 内藤纯也村上俊夫池田周之冲田圭介
Owner KOBE STEEL LTD