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Hot-press coated steel sheet, method of manufacturing hot-press coated steel sheet, method of manufacturing hot-press formed product, and method of manufacturing vehicle

A manufacturing method and steel plate technology, which is applied in the field of vehicle manufacturing, can solve problems such as surface deterioration, high heating temperature, and coating evaporation

Active Publication Date: 2020-06-09
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heating temperature is higher than the decomposition temperature of organic materials or the boiling point of metallic materials such as Zn, etc.
Therefore, when heating for hot pressing, the plating layer on the surface may evaporate, causing significant deterioration of the surface properties.

Method used

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  • Hot-press coated steel sheet, method of manufacturing hot-press coated steel sheet, method of manufacturing hot-press formed product, and method of manufacturing vehicle
  • Hot-press coated steel sheet, method of manufacturing hot-press coated steel sheet, method of manufacturing hot-press formed product, and method of manufacturing vehicle
  • Hot-press coated steel sheet, method of manufacturing hot-press coated steel sheet, method of manufacturing hot-press formed product, and method of manufacturing vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4、 comparative example 5～6

[0177] Cold-rolled steel sheets having the thicknesses shown in Table 1 (by mass % C: 0.21%, Si: 0.12%, Mn: 1.21%, P: 0.02%, S: 0.012%, Ti: 0.02%, B: Al: 0.03%, Al: 0.04%, remainder: Fe and impurities) were plated with Al by Sen's strip nitriding dip galvanizing method. The annealing temperature was set at about 800° C., and the Al plating bath contained 9% Si and Fe eluted from the cold-rolled steel sheet. After adjusting the Al basis weight after plating by the gas wiping method, and setting it to the Al basis weight per surface shown in Table 1, it cooled. After that, a chemical solution (nanotek slurry manufactured by C.I. Kasei Co., Ltd., particle size of zinc oxide particles = 70 nm) was applied by a roll coater on the formed Al plating layer, and sintered at about 80° C. to form ZnO film with the indicated adhesion amount (converted from Zn amount). Next, on the ZnO film, zinc bis-octoate ("Zn-OCTOATE 22% solvent-free" manufactured by DIC), which is a zinc-based metal...

Embodiment 5～8、 comparative example 7～8

[0179] Cold-rolled steel sheets having the thicknesses shown in Table 1 (by mass % C: 0.21%, Si: 0.12%, Mn: 1.21%, P: 0.02%, S: 0.012%, Ti: 0.02%, B: Al: 0.03%, Al: 0.04%, remainder: Fe and impurities) were plated with Al by Sen's strip nitriding dip galvanizing method. The annealing temperature was set at about 800° C., and the Al plating bath contained 9% Si and Fe eluted from the cold-rolled steel sheet. After adjusting the Al basis weight after plating by the gas wiping method, and setting it to the Al basis weight per surface shown in Table 1, it cooled. After that, on the formed Al plating layer, zinc bis-octoate ("Zn-OCTOATE 22% solvent-free" manufactured by DIC) was applied as a zinc-based metal soap by a roll coater to form a coating amount shown in Table 1. Zinc-based metal soap film. In this way, a test material of a plated steel sheet was obtained.

[0180]

[0181] The properties of the test material of the plated steel sheet manufactured as above were evalua...

Embodiment 9～16、 comparative example 9、 reference example 1

[0198] During the period from the manufacture of coated steel sheets to hot press forming (hot pressing) (see image 3 ), the objects (period) and conditions (formation method, adhesion amount, presence or absence of a heating process for making the zinc-based metal soap film into a ZnO film, and the formation site) of the zinc-based metal soap film are shown in Table 2. This was changed to manufacture a press-molded product (dish-shaped molded product). However, when the object to form the zinc-based metal soap film was the surface of the Al plating layer, the ZnO film was not formed.

[0199] In hot press forming (hot pressing), the plated steel sheet was heated to 900°C in the same manner as the hot lubricity evaluation test, and then pressed at 700°C and a pressing load of 3 kN.

[0200] In addition, the type of steel sheet, the conditions for forming the Al plating layer, the conditions for forming the ZnO film, and the type of zinc-based metal soap were set to the same ...

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Abstract

The present invention relates to a plated steel sheet for hot pressing and a method for producing the same. The plated steel sheet for hot pressing has a plated steel plate body and a zinc-based metal soap film. Aluminum coatings on both sides, the zinc-based metal soap film is provided on the aluminum coating side of the plated steel sheet body, and the adhesion amount is 7.1 to 19.8 g / m in conversion of Zn amount 2 , wherein, in the plated steel sheet body, in the case of having a zinc oxide film on the surface of the aluminum plating layer, the total adhesion amount of the above-mentioned zinc oxide film and the above-mentioned zinc-based metal soap film is 7.1 to 19.8 g in terms of Zn amount / m 2 . In addition, the present invention relates to a method of manufacturing a hot-press formed product using the plated steel sheet for hot pressing and a method of manufacturing a vehicle using the press-formed product manufactured by the method of manufacturing the hot-press formed product.

Description

technical field [0001] The present application relates to a hot-press coated steel sheet, a method of manufacturing a hot-press coated steel sheet, a method of manufacturing a hot-press formed product, and a method of manufacturing a vehicle. Background technique [0002] In recent years, in order to protect the environment and prevent global warming, there has been an increasing demand to suppress the consumption of chemical fuels, and this demand has affected various manufacturing industries. For example, automobiles, which are indispensable in daily life and activities as means of transportation, are also required to improve fuel efficiency by reducing the weight of the vehicle body and the like. However, in the case of automobiles, simply reducing the weight of the car body is not acceptable in terms of product quality, and it is necessary to ensure appropriate safety. [0003] The structure of an automobile is often formed of iron, especially a steel plate, and reducin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/00C22C38/00B21D22/20B21D22/26C21D1/18C21D9/00C22C21/02C22C38/14C23C2/12
CPCB21D22/20B21D22/26C21D1/18C21D9/00C22C38/00C23C2/12C23C28/345C23C2/26C23C2/40C23C28/321C23C2/28C23C2/29C23C28/34C23C18/1216B21D22/022B21D22/208C21D9/52C22C21/02C23C28/00B21D22/00C23C2/06C23C22/66C23C28/025
Inventor 久保雅宽中泽嘉明铃木利哉野村成彦藤田宗士入川秀昭
Owner NIPPON STEEL CORP
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