Hot press forming method, electroplating steel products thereof and preparation method for the same

A technology of hot-press forming and steel materials, which is applied in hot-dip plating process, electrolytic coating, solid-state chemical plating, etc., which can solve the problems of increased cost and deterioration of compressible formability

Inactive Publication Date: 2008-03-19
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with these measures, there is a problem of an increase in cost due to the addition of Cr and Mo, and in the

Method used

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  • Hot press forming method, electroplating steel products thereof and preparation method for the same
  • Hot press forming method, electroplating steel products thereof and preparation method for the same
  • Hot press forming method, electroplating steel products thereof and preparation method for the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0135] In this example, hot-dip galvanized (galvanized) steel sheets of steel A having a steel sheet thickness of 1.0 mm as shown in Table 1 were subjected to galvanized layer diffusion heat treatment at 650°C. After it was removed from the heating furnace, it was then heated in an atmospheric furnace (furnace under atmospheric conditions) at 950°C for 5 minutes, and at this high temperature, the steel sheet was hot-press formed by deep drawing (cupping) . The hot press forming conditions were a drawing depth of 25 mm, a shoulder radius R of 5 mm, an outer diameter of 90 mm, a punch diameter of 50 mm and a die diameter of 53 mm. In order to evaluate the press formability, the adhesion state of the plating layer after press molding was determined by visual observation to determine whether the plating layer peeled off. In this example, the temperature of the steel plate reached 900°C in approximately 2 minutes.

[0136] Coating film adhesion and post-paint corrosion resistance...

Embodiment 2

[0150] In this example, in the same manner as described in Example 1, the test of steel A above was generally repeated, but as shown in Table 3, the coating weight of the electroplating was changed, and / or the diffusion heat treatment of the galvanized layer was changed ( It is carried out immediately after electroplating) to change the Fe content in the plating layer.

[0151] Furthermore, in this example, before hot press forming, the galvanized layer diffusion-treated steel sheet was heated by (A) heating in an atmospheric furnace at 950°C for 5 minutes, or (B) heating in an atmospheric furnace at 850°C Heat on medium for 3 minutes. In No. 9-23, the temperature (500-800° C.) and time (up to 30 minutes) of the diffusion heat treatment of the galvanized layer are changed before hot press forming and before heating the steel sheet to change the Fe content in the coating. For Nos. 18-23, the heating time before thermoforming for condition B was extended from 3 minutes to 6 min...

Embodiment 3

[0160] In this example, each of the steels shown in Table 1 was tested in the same manner as described in Example 1 to evaluate formability, paint film adhesion and corrosion resistance. The results are shown in Table 4.

[0161]

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Abstract

Hot press forming of a steel material is made possible by coating the surface of the steel material with a plated layer of zinc or a zinc alloy and forming thereon a barrier layer which prevents the vaporization of zinc even when heated to 700-1000 DEG C. Corrosion resistance can also be guaranteed without requiring post treatment, and hot press forming of high tensile steel sheet and stainless steel sheet is made possible. The barrier layer is formed by forming an upper plated layer, by surface oxidation, by contact with an oxidizing agent, by contact with Zn and an oxidizing agent, by anodic electrolysis, by cathodic electrolysis, or by coating with a ZnO sol.

Description

[0001] This application is a divisional application filed on October 10, 2002, the application number is 02821081.6, and the invention name is "hot pressing forming method, its electroplated steel material and its preparation method". technical field [0002] The present invention relates to a steel material for hot press forming, and more particularly, to a steel material for hot press forming suitable for use in the production of automobile suspensions, car bodies, reinforcement parts and the like, and a method for producing the same , and relates to a hot press forming method for the steel. Background technique [0003] In recent years, in order to reduce the weight of automobiles, efforts have been made to reduce the thickness of steel materials used in automobiles by increasing their strength. However, this leads to problems as described below, taking steel plates, which are representative of steel materials, as an example. As the strength of the steel sheet used incre...

Claims

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Application Information

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IPC IPC(8): C23C28/00C23C2/06C23C2/26C25D11/34C22C38/00C23C20/08C23C22/24C23C22/53C25D9/10
Inventor 今井和仁土岐保吉川幸宏高桥克西畑敏伸小嶋启达
Owner NIPPON STEEL CORP
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