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Al-plated steel sheet for hot pressing and process for manufacturing al-plated steel sheet for hot pressing

A manufacturing method and a technology for steel sheets, which are applied in the field of manufacturing Al-plated steel sheets for hot pressing and Al-plated steel sheets for hot pressing, can solve the problems of reduced adhesion, deterioration of corrosion resistance, etc., and achieve excellent spot weldability and improved productivity. Effect

Active Publication Date: 2016-07-27
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the amount of Al deposited decreases, the corrosion resistance will deteriorate

Method used

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  • Al-plated steel sheet for hot pressing and process for manufacturing al-plated steel sheet for hot pressing
  • Al-plated steel sheet for hot pressing and process for manufacturing al-plated steel sheet for hot pressing

Examples

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Effect test

Embodiment 1

[0104] In Example 1 described below, cold-rolled steel sheets (sheet thickness: 1.4 mm) having the steel composition shown in Table 1 were used, and the surface of the cold-rolled steel sheets was plated with Al by the Sendzimir method. The annealing temperature at this time is about 800°C. In addition, the Al plating bath contains Si: 9%, and also contains Fe eluted from the steel strip. The amount of adhesion after plating is adjusted to 80g / m on both sides by the gas wiping method 2 , After cooling, a coating solution containing any one of zinc oxide, zinc hydroxide, and zinc acetate was applied with a roll coater, and dried at the highest attained plate temperature shown in Table 2.

[0105] In addition, the contact angle, surface tension, and viscosity of the coating liquid used are shown in Table 1 below. Here, the contact angle, surface tension, and viscosity of the coating liquid were adjusted by adding water, Surfynol 104E, and / or Aron B500 to the coating liquid.

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Abstract

The invention relates to an Al-plated steel sheet which is to be subjected to hot pressing and which exhibits excellent hot lubricity, excellent corrosion resistance after coating and excellent spot weldability. This Al-plated steel sheet for hot pressing comprises a steel sheet, an Al deposit layer formed on one or both surfaces of the steel sheet, and a surface film layer formed on the Al deposit layer, wherein: the surface film layer contains a zinc compound, the zinc compound adheres to the Al-plated steel sheet in an amount of 0.3 to 1.5g / m<2> per surface in terms of metallic zinc, and the amount of zinc adhering to an arbitrary continuous area of one square millimeter is 1.5g / m2 or less.

Description

technical field [0001] The present invention relates to a method for producing a plated steel sheet for hot pressing coated with an Al plating layer containing Al as a main component, and an Al plated steel sheet for hot pressing. 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 fossil fuels, and this demand has an impact on various manufacturing industries. For example, automobiles, which are indispensable for daily life and activities as a means of transportation, are no exception, and improvements in fuel efficiency through weight reduction of vehicle bodies are required. However, for automobiles, simply reducing the weight of the car body is not allowed in terms of product functions, and it is necessary to ensure appropriate safety. [0003] Many automobile structures are formed of iron-based materials (especially steel sheets), and reducing t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/12B21D22/20C23C2/28C23C2/40C22C21/02C22C38/00C22C38/38
CPCC23C2/12C23C2/28C23C2/40C22C21/02C22C38/00C22C38/38B21D22/022B21D35/005C22C21/00B32B15/012C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/18Y10T428/12611Y10T428/12757C23C2/29C22C21/10C23C2/20C23C22/66
Inventor 藤田宗士山中晋太郎真木纯富士本博纪及川初彦入川秀昭
Owner NIPPON STEEL CORP
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