Method for manufacturing thermocompression-formed component and thermocompression-formed component
A technology of hot press forming and manufacturing method, which is applied in the manufacture of hot press formed components and the field of hot press formed components, and can solve the problems of reduced fatigue resistance of hot press formed components, liquid metal embrittlement cracks, surface damage of components, etc.
Active Publication Date: 2017-05-17
JFE STEEL CORP
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Problems solved by technology
[0004] However, in the technique proposed in Patent Document 1, there is a problem that when the steel sheet is heated to a high temperature of about 900° C. before pressing, scale (iron oxide) is formed on the surface of the steel sheet, and the scale peels off during hot press forming. Damage the mold, or damage the surface of the component after hot pressing
However, liquid metal embrittlement cracks caused by Zn in the plating layer may occur, and cracks with a depth of about 100 μm may occur in the surface layer of the hot press formed member
If such cracks occur, it will cause various problems such as a decrease in the fatigue resistance of the hot press formed member
Method used
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[0117] Steel having the composition shown in Table 1 is melted to form a cast slab, and the cast slab is heated to 1200°C, hot-rolled at a finishing temperature of 870°C, and then coiled at 600°C to form a hot-rolled sheet. steel plate. Next, the hot-rolled steel sheet was pickled and then cold-rolled at a rolling reduction of 65% to obtain a cold-rolled steel sheet having a thickness of 1.6 mm. Ac described in Table 1 3 The phase transition point is calculated by the following formula (1) (refer to William C. Leslie, translated by Koda Naruyasu, Kumai Hiroshi, and Noda Tatsuhiko, "Leslie Iron and Steel Materials Science", Maruzen Co., Ltd., 1985, p. 273).
[0118] Ac 3 (℃)=910-203√[C]+44.7×[Si]-30×[Mn]+700×[P]+400×[Al]...(1)
[0119] It should be noted that, in (1) formula, [C], [Si], [Mn], [P], [Al] are the content (mass %) of each element (C, Si, Mn, P, Al) .
[0120] Using the cold-rolled steel sheet obtained as above as a base steel sheet, a pure Zn coating, a Zn-Fe...
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Abstract
When hot-pressing a surface-treated steel sheet having a Zn-based coating layer formed on the surface of a base steel sheet to produce a hot-press formed member, the surface-treated steel sheet is heated to a temperature range of 750° C. to 1000° C., and the surface Cooling the surface of the treated steel sheet, when the surface temperature of the surface-treated steel sheet is 400°C or lower and the average temperature of the surface-treated steel sheet is 500°C or higher, or the temperature of the central portion of the surface-treated steel sheet in the thickness direction is 530°C Hot press forming was carried out under the above conditions.
Description
technical field [0001] The present invention relates to a hot press-formed member that requires strength and corrosion resistance, such as a structural member used in automobile parts, and a manufacturing method thereof, and particularly relates to a hot-press-formed member and a manufacturing method thereof that are described below. The component is a surface-treated steel plate with a coating layer formed on the surface of the base steel plate as a raw material. When the pre-heated surface-treated steel plate is hot-press-formed into a predetermined shape, the base steel plate is quenched while giving the shape to obtain a specified strength. thermoformed components. Background technique [0002] In recent years, from the viewpoint of global environmental protection, regulations on exhaust gas from automobiles have been strengthened. Under such circumstances, improving the fuel efficiency of automobiles has become an important issue, and higher strength and thinner thickn...
Claims
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IPC IPC(8): B21D22/20C21D1/18C21D9/00C22C18/00C23C2/06C23C2/26C23C2/40B21D53/88C21D9/46C22C38/00C22C38/60
CPCC23C2/06C21D9/46C21D1/18C22C18/00C22C38/00C22C38/60C21D8/0226C21D8/0236C21D1/673C23C2/28C23C2/405B32B15/013C22C38/12C21D1/60C21D6/002C21D6/005C21D6/008C21D8/0205C21D8/0221C21D9/0068C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/14C22C38/32C23C2/29
Inventor 中垣内达也时田裕一簑手彻玉井良清
Owner JFE STEEL CORP