Jfe Steel Corporation

Agc Inc.

Masahiko Tada

Masayasu Nagoshi

Katsuya Hoshino

Wataru Tanimoto

Hiroshi Kajiyama

Yoichi Makimizu

Naoto Yoshimi

Makoto Sano

Yoichi Tobiyama

Hiroyuki Masuoka

Shinji Ootsuka

Kyoko Fujimoto

Masao Ozeki

Osami Taito

Takahiro Kubota

Kazuhiko Higai

Kazuaki Kyono

Hideo Kijima

Hisato Noro

Noriko Makiishi

Sakae Fujita

In a glass substrate for extracting therefrom a plurality of cover glasses to protect a protection object, plural concave portions are provided in a front surface or back surface of the glass substrate. The glass substrate includes plural thin portions formed by providing the plural concave portions and a thick portion connecting to the thin portion, and a haze value of the thin portion is 8% or less.

Glass substrate and method for manufacturing the same, cover glass and method for manufacturing the same, personal digital assistant, and display device

An object of the present invention is to make it possible, without necessitating an alkali pretreatment, to form a zinc oxide layer having excellent sliding properties on a hot dip galvanized steel sheet not subjected to alloying after galvanizing and thus having a relatively low degree of surface activity. Another object of the present invention is to make it possible to manufacture a hot dip galvanized steel sheet having higher area ratio of Zn oxide layer formed on a coating surface and larger thickness of the Zn oxide layer. Specifically, the present invention provides a method for manufacturing a hot dip galvanized steel sheet comprising: subjecting a steel sheet to hot dip galvanizing and subsequent temper rolling; bringing the steel sheet into contact with acidic solution having pH buffering capacity; retaining the steel sheet for 1 second to 60 seconds after the contact with the acidic solution; and rinsing the steel sheet with water, to form a zinc oxide layer on a coating surface of the steel sheet, characterized in that the method further comprising: carrying out the temper rolling by either rolling the steel sheet first with a dull roll having Ra&#x2267;2.0 &#x3bc;m at rolling reduction rate &#x2266;5% and then with a bright roll having Ra&#x2266;0.1 &#x3bc;m at rolling reduction rate &#x2266;3% or rolling the steel sheet first with a bright roll having Ra&#x2266;0.1 &#x3bc;m at rolling reduction rate &#x2266;3% and then with a dull roll having Ra&#x2266;2.0 &#x3bc;m at rolling reduction rate &#x2266;5%.

Method for manufacturing hot dip galvanized steel sheet

A zinc-based metal plated steel sheet is excellent in tribological properties during press forming. An oxide layer containing crystalline 3Zn(OH)&#xb7;ZnSO&#xb7;xHO is formed on a plated surface. The oxide layer has a thickness of 10 nm or more. The crystalline oxide layer is composed of 3Zn(OH)&#xb7;ZnSO&#xb7;3-5HO.

Zinc-based metal plated steel sheet

A zinc-based metal plated steel sheet is excellent in tribological properties during press forming. An oxide layer containing crystalline 3Zn(OH).ZnSO.xHO is formed on a plated surface. The oxide layer has a thickness of 10 nm or more. The crystalline oxide layer is composed of 3Zn(OH).ZnSO.3-5HO.

Growing community of inventors

Tokyo, Japan

Masahiko Tada