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Hot press forming method, and a plated steel material therefor and its manufacturing method

A hot-press forming and steel technology, applied in heat treatment equipment, hot-dip plating process, electrolytic coatings, etc., can solve the problems of increased cost and deterioration of press-forming performance.

Inactive Publication Date: 2005-02-02
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 case of materials for press molding, deterioration of press formability due to the addition of these alloying elements

Method used

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  • Hot press forming method, and a plated steel material therefor and its manufacturing method
  • Hot press forming method, and a plated steel material therefor and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0133] 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 is removed from the heating furnace, it is then heated in an atmospheric furnace (furnace under atmospheric conditions) at 950°C for 5 minutes, and at this high temperature, the steel sheet is 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.

[0134] Coating film adhesion and post-paint corrosion resistance (h...

Embodiment 2

[0147] 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.

[0148] In addition, 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

[0156]

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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

technical field [0001] 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 [0002] 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 increases, when the steel sheet is press-formed by, for example, stretching, the contact pressure of the steel sheet and the mold at the time of stretching increases. As a result, abrasion of the steel plate or breakage of the steel plate ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00C23C2/06C23C2/26C23C2/28C23C8/02C23C16/455C23C22/53C23C28/00C23C28/02C25D5/10C25D9/10C25D11/34
CPCC23C28/3225C23C28/345C23C2/26C25D11/34C21D1/673C25D9/10C23C28/321C23C8/02C25D5/10C23C28/325Y10T428/12792Y10T428/12771C23C2/261C23C2/29C22C38/14C22C38/06C22C38/04C22C38/02C22C38/001
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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