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Hot-pressed part and its manufacturing method

A manufacturing method and technology for parts, applied in the plating, coating, metal material coating process of superimposed layers, etc., can solve the problems of surface damage of parts, mold damage, insufficient corrosion resistance, etc.

Active Publication Date: 2019-02-12
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this hot pressing, the steel sheet is heated to a high temperature of about 950° C. before hot pressing, so there is a problem that scale (iron oxide) is formed on the surface of the steel sheet, and the scale is peeled off during hot pressing to make the Tool damage, or damage to the surface of the hot-pressed part
However, the hot-pressed parts produced through the above-mentioned steps are not provided with a rust-proof film such as a plating layer, so the corrosion resistance is not yet sufficient.

Method used

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  • Hot-pressed part and its manufacturing method
  • Hot-pressed part and its manufacturing method
  • Hot-pressed part and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] As the base steel sheet, a steel sheet containing C: 0.23%, Si: 0.25%, Mn: 1.2%, P: 0.01%, S: 0.01%, Al: 0.03%, N: 0.005%, and Cr: 0.2% was used in mass %. , Ti: 0.02%, B: 0.0022%, Sb: 0.008%, and the remainder is composed of Fe and unavoidable impurities, Ac 3 A cold-rolled steel sheet with a transformation point of 820°C and a thickness of 1.6 mm. The surface of this cold-rolled steel sheet was plated with Zn-Ni by an electroplating method, and steel sheet No. 1-20 were produced. Zn-Ni plating is carried out in a plating bath containing 200g / L of nickel sulfate hexahydrate and 10-100g / L of zinc sulfate heptahydrate with a pH of 1.5 and a bath temperature of 50°C. The current density is set to 5 ~100A / dm 2 Plating is performed. The Ni content was adjusted by changing the amount of zinc sulfate heptahydrate added and the current density. In addition, by changing the energization time, the plating deposition amount was adjusted.

[0077] The steel plates Nos. 1 to 2...

Embodiment 2

[0088] As the base steel sheet, a steel sheet containing the composition shown in Table 2, the remainder consisting of Fe and unavoidable impurities, and having Ac shown in Table 2 was used. 3 The plate thickness at the transformation point is a cold-rolled steel plate of 1.6 mm. Zn—Ni plating was performed on both surfaces of the cold-rolled steel sheet in the same manner as in Example 1, and steel sheet Nos. 21 to 35 having the Ni content and plating deposition amount shown in Table 3 were produced.

[0089] The steel plates No. 21 to 35 produced in this way were heated in an electric furnace so that the maximum attained plate temperature and the total heating time shown in Table 3 were obtained, and after the heating for a predetermined time was completed, they were immediately clamped with flat dies made of Al. , for quenching.

[0090] About the produced sample, the measurement of the void formation rate and the evaluation of coating adhesiveness were performed similarly...

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Abstract

The present invention provides a hot-pressed part with excellent coating adhesion and a manufacturing method thereof. A hot-pressed part, characterized in that a plated layer containing Zn and Ni is provided on the surface of a steel plate constituting the part, and an oxide film containing Zn is further provided on the plated layer, and a gap between the plated layer and the oxide film is formed. The void formation rate is 80% or less.

Description

technical field [0001] The present invention relates to a hot-pressed part suitable for use in an automobile underbody part, a vehicle body structural part, and the like, and a method for manufacturing the same. Background technique [0002] Conventionally, most of automobile underbody parts, vehicle body structural parts, and the like are produced by press working a steel plate having a predetermined strength. In recent years, from the viewpoint of protection of the global environment, weight reduction of automobile bodies has been earnestly desired, and efforts have been made to increase the strength of steel sheets used and reduce their thickness. However, as the strength of the steel sheet increases, the press workability decreases, so it is often difficult to process the steel sheet into a desired part shape. [0003] Therefore, Patent Document 1 proposes processing called hot pressing that can achieve both ease of processing and high strength by rapidly cooling a heat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/26B21D22/20C23C28/00C25D5/50
CPCC25D5/50C25D3/565C21D8/0278C25D5/36C25D7/0614B21D22/022C22C18/00C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/18C22C38/28C22C38/32C22C38/60
Inventor 中岛清次森本美奈子安藤聪
Owner JFE STEEL CORP
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