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Hot stamp molded body

A hot stamping forming and averaging technology, applied in hot dip plating process, superimposed layer plating, coating, etc., can solve the problem that the fatigue properties of hot stamping moldings cannot be fully obtained, and the moldings cannot be sufficiently phosphated. It has the advantages of improved phosphate treatment, improved fatigue properties, and improved weldability.

Inactive Publication Date: 2018-12-21
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that a phosphate film is difficult to form in the phosphate treatment performed before the coating of the automotive parts in the molded body on which the Al plating layer is formed.
In other words, there is a problem that the molded article obtained by the technique of Patent Document 2 cannot sufficiently obtain phosphate treatment properties.
However, in the technique of Patent Document 3, there is a possibility that LME may occur and the fatigue properties of the hot stamped body cannot be sufficiently obtained.
In addition, in the technique of Patent Document 3, there is a possibility that elements added to the plating layer may degrade the phosphate treatability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0125] The inventors of the present invention respectively formed an Al—Zn-based plating layer, a Zn-based plating layer, and an Al-based plating layer on the base material 10 . The Al-Zn-based plating layer is set as a layer containing 55.0 mass % of Al and 45.0 mass % of Zn, the Zn-based plating layer is set as a layer containing substantially only Zn, and the Al-based plating layer is set as a layer containing substantially only Al .

[0126] Next, the steel material on which each coating layer was formed (the coated steel material including the base material and the coating layer) was put into the first heating furnace, heated to 700° C., and kept in this temperature range for 120 seconds. Then, put the coated steel material into the second heating furnace and heat it to 900°C, and then according to the steel material temperature at Ac 3 The plated steel material was taken out from the 2nd heating furnace so that the time in the range of -950 degreeC reached 30 seconds. ...

Embodiment 2

[0133] First, using molten steel having the chemical composition shown in Table 1, slabs were produced by continuous casting. Next, the slab was hot-rolled to produce a hot-rolled steel material, and the hot-rolled steel material was further pickled, and then cold-rolled to produce a cold-rolled steel material. Then, this cold-rolled steel material was used as a base material (thickness: 1.4 mm) for production of a hot-stamped body. Ac of base metal 3 The point is about 810°C.

[0134] Table 1

[0135]

[0136] Next, a plating layer was formed on the base material produced in this way using a plating bath having the composition shown in Table 2, and a steel material for hot stamping was obtained. The deposition amount of the plating layer was controlled so that the total weight of Al and Zn became the value shown in Table 2. The steel was heated to the alloying temperature shown in Table 2, and the temperature was maintained during the alloying time shown in Table 2. T...

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Abstract

The hot stamp molded body according to an embodiment of the present invention is provided with a base metal and a plated layer. The plated layer comprises, in order from the base metal to the surface,an interfacial layer, an intermediate layer, and an oxide layer. For the interfacial layer: the structure comprises at least a total of 99 area% of [alpha]Fe, Fe3Al and FeAl; the average Al content is in the range of 8.0 mass% to 32.5 mass%; the average Zn content is limited to being greater than the Zn content of the base metal and 5 mass% or less; the balance of the chemical components comprises Fe and impurities; and the average film thickness is at least 1.0 [mu]m. For the intermediate layer, the structure comprises at least a total of 99 area% Fe(Al, Zn)2 and Fe2(Al, Zn)5; the average Alcontent is 30-50 mass%; the average Zn content is 10-40 mass%; the balance of the chemical components comprises Fe and impurities; and the average film thickness is at least 5.0 [mu]m. For the oxidelayer, the average film thickness is 0.1-3.0 [mu]m.

Description

technical field [0001] The present invention relates to a hot stamped formed body. Background technique [0002] Structural members (molded bodies) used in automobiles and the like are sometimes produced by hot stamping (hot pressing) in order to improve both strength and dimensional accuracy. When manufacturing a molded body by hot stamping, the steel for hot stamping is heated to Ac 3 Above the point, the steel for hot stamping is pressed with a mold and cooled rapidly. That is, in this production, press working and quenching are performed simultaneously. A molded body with high dimensional accuracy and high strength can be produced by hot stamping. [0003] On the other hand, since molded objects produced by hot stamping are processed at high temperatures, iron oxide scales are formed on the surface. Therefore, techniques have been proposed for suppressing the formation of iron oxide scales and improving the corrosion resistance of molded products by using plated stee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/28C23C2/06C23C2/12C22C38/00C22C38/58
CPCC23C2/06C23C2/12C23C2/28C22C38/00C22C38/58C21D6/002C21D6/005C21D6/008C21D8/005C22C18/04C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/28C22C38/32C23C28/321C23C28/322C23C28/345C23C2/29C23C2/261B21D22/022B21D22/20
Inventor 仙石晃大竹林浩史秋冈幸司
Owner NIPPON STEEL CORP
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