Asahi Glass Company, Limited

Agc Inc.

Nippon Steel Sumitomo Metal Corporation

Tsubota Laboratory, Inc.

Nippon Steel Corporation

Kensuke Nagai

Tetsuya Nakashima

Kei Maeda

Hiroyuki Hijiya

Eriko Maeda

Yutaka Kuroiwa

Tatsuo Nagashima

Osamu Kagaya

Manabu Nishizawa

Ryuta Sonoda

Yasuhiro Shinohara

Yuichi Kuroki

Takato Kajihara

Takashi Enomoto

Kazuhiro Suzuki

Yusuke Arai

Takuya Hara

Akio Koike

Tatsuo Yokoi

Hitoshi Asahi

Yuichi Suzuki

Osamu Yoshida

Hideyuki Nakamura

Kazuo Tsubota

Yuya Shimada

Shinya Sakamoto

Masamichi Tanida

Toshihide Kurihara

Tomoyuki Tsujimura

Noboru Hasegawa

Terutaka Maehara

Hidemasa Torii

Shunichi Kobayashi

Hiroaki Hamamoto

Ryoji Akiyama

Akira Kondo

Shuji Kabashima

Masakazu Ozaki

Hideto Kawano

Shingo Urata

Daiki Akie

To provide a glass plate for a window material and a window comprising the glass plate, which are less likely to be a barrier to radio transmitting/receiving in use of a radio-utilizing apparatus, and a radio communication apparatus comprising the glass plate. A glass plate having a radio transmittance of at least 20% at a frequency of 100 GHz as calculated as 18 mm thickness, a window comprising the glass plate, and a radio communication apparatus comprising the glass plate.

Glass plate and window

A soda lime glass plate has, on the basis of oxides, a total sulfur content in terms of SOof 0.001 to 0.2% in mass %, a total iron content in terms of FeOof 0.15 to 0.4% in mass %, and a total tin content in terms of SnOof 0.02 to 1% in mass %, and has a mass proportion of a divalent iron in terms of FeOin the total iron in terms of FeOof 45 to 70%. The soda lime glass plate has, as a conversion value for a 3.85 mm-thickness glass plate, a visible light transmittance Tv_A of 70% or more, a total solar transmittance Tts of 63.7% or less, and c* in the L*a*b* color space of 4 or less.

Soda lime glass sheet

A wavelength-selective transmissive glass has a light transmittance Tat a wavelength of more than 315 nm and 400 nm or less represented by the formula shown below of 1% or more in terms of a plate thickness of 6 mm and a light transmittance Tat a wavelength of 315 nm or less represented by the formula shown below of 60% or less in terms of a plate thickness of 6 mm. Ais a weighting factor at a wavelength k (nm) for calculating T (light transmittance) defined in ISO-9050:2003, and Tis a transmittance at the wavelength k (nm) in terms of a plate thickness of 6 mm:=(&#x3a3;)/(&#x3a3;)=(&#x3a3;)/(&#x3a3;).

Glass

In a soda lime glass, a content of total iron calculated as FeO, expressed in mass % on an oxide basis, is 0.25 to 1%, a mass proportion of divalent iron calculated as FeOin the total iron calculated as FeOis 30 to 50%, a content of total sulfur calculated as SO, expressed in mass % on an oxide basis, is 0.003 to 0.1%, and a content of Se is 3 mass ppm or more. In the soda lime glass, visible light transmittance Tvis 30 to 55% calculated as 6 mm thickness of a glass sheet, solar direct transmittance Te is 20 to 40% calculate as 6 mm thickness of a glass sheet, and excitation purity Pe is 8.0% or less calculated as 6 mm thickness of a glass sheet.

Soda-lime glass

The present invention pertains to a glass for a data storage medium substrate which contains a specific amount of each of SiO, AlO, MgO, CaO, SrO, BaO, LiO, NaO, and KO, in molar percentage based on the oxides, and does not substantially contain BOor ZrO, wherein the sum of the LiO, NaO, and KO contents (RO), the molar ratio of the SiOcontent to the AlOcontent (SiO/AlO), and the molar ratio of the sum of the SiOand AlOcontents (SiO+AlO) to RO[(SiO+AlO)/RO] fall within their specific ranges, formula (1): 90&#x3c;[SiO]+2&#xd7;[AlO]+0.8&#xd7;[RO]&#x2212;0.5&#xd7;[RO] [in formula (1), RO represents the sum of the MgO, CaO, SrO, and BaO contents] is satisfied, and the glass transition point T, the alkali resistance, and the acid resistance fall within their specific ranges.

Glass for data storage medium substrate, glass substrate for data storage medium, and magnetic disk

The present invention aims to provide a heat-ray- and ultraviolet-absorbing glass plate having low solar transmittance and ultraviolet transmittance, having a high visible light transmittance, and containing a small amount of bubbles. The present invention relates to a heat-ray- and ultraviolet-absorbing glass plate that is a soda lime glass having a specific composition, having a mass proportion of divalent iron to the total iron being 50% or more, and having, as a value calculated as 4 mm thickness of the glass plate, a visible light transmittance Tv of 66% or more, a solar transmittance Te of 65% or less, a ratio Tv/Te of Tv and Te of 1.3 or more, and an ultraviolet transmittance Tuv of 50% or less.

Heat-ray- and ultraviolet-absorbent glass sheet, and method for manufacturing same

There is provided a process for producing molten glass, which is capable of easily increasing the HO content in glass melt with excessive generation of convection of the glass melt being reduced. One mode of the process for producing molten glass according to the present invention is characterized to include a material melting step for melting a raw glass material in a melting furnace to prepare glass melt; a water-molecules supply step for supplying a water-molecules supply gas into the glass melt flowing from an upstream end of the melting furnace toward a downstream end of the melting furnace; and a refining step for degassing, under a reduced pressure atmosphere, the glass melt flowing out of the downstream end; wherein a position where the water-molecules supply gas is supplied in the water-molecules supply step includes a first position and a second position from downstream to upstream in a flowing direction of the glass melt in this order; the first position is a position away from both of the upstream end and the downstream end; and the second position is a position closer to the upstream end than a center of a distance between the upstream end and the first position in the flowing direction of the glass melt.

Method for manufacturing molten glass, method for manufacturing glass product, and device for manufacturing molten glass

To provide a colored glass plate of which the mass ratio of divalent iron as calculated as FeOto total iron as calculated as FeOcan be stably maintained at a high level while amber coloring derived from salt cake (NaSO) is suppressed by reducing the amount of salt cake used as a refining agent, and which has less bubbles regardless of a small amount of total sulfur as calculated as SO. A colored glass plate which is made of alkali-containing silica glass containing iron, tin and sulfur, wherein, as represented by mass % based on oxides, the proportion of total sulfur as calculated as SOis less than 0.025%, the proportion of divalent iron as calculated as FeOto total iron as calculated as FeOis at least 45%, the proportion of divalent tin as calculated as SnOto total tin as calculated as SnOis at least 0.1% as represented by mol %, and &#x3b2;-OH is at least 0.15 mm.

Colored glass plate and method for manufacturing same

An electric resistance welded steel pipe which has sufficient strength and low-temperature toughness and a low yield ratio and which is suitable as a line pipe to be laid in depths of the sea, characterized in that: the composition of the base material contains, in mass %, 0.05 to 0.10% of C, 1.00 to 1.60% of Mn, and 0.005 to less than 0.035% of Nb, and has a Ceq value of 0.23 to 0.38; and the metal microstructure of the base material contains 3 to 13% of martensite in area fraction with the balance being ferrite.

Electric resistance welded steel pipe

There are provided a conduit structure for molten glass, a vacuum degassing apparatus using the conduit structure, and a process for vacuum-degassing molten glass by use of the vacuum degassing apparatus, wherein without using a cooling system, solid thermal insulating materials constituting a backup for the conduit are prevented from being corroded by molten glass oozing out of a joint between adjacent fused cast refractories constituting the conduit, and wherein production cost is reduced. A conduit structure for molten glass, comprising a conduit and a backup disposed around the conduit; the conduit being a hollow pipe made of fused cast refractories disposed in longitudinal and circumferential directions thereof; the backup comprising a refractory layer outside the conduit, and a thermal insulating material layer disposed outside the refractory layer; the refractory layer including a refractory brick layer made by placing refractory bricks along the longitudinal and circumferential directions of the conduit, and a monolithic refractory layer formed by placing a monolithic refractory containing from 30 to 100% of AlOand from 0 to 70% of SiOin percent by mass on an oxide basis and sintering the monolithic refractory;

Molten glass conduit structure, and device and method using conduit structure

To provide a colored glass plate, which uses sodium sulfate (NaSO) as a refining agent and which is capable of stably maintaining the mass percentage of divalent iron calculated as FeOin the total iron calculated as FeOat a high level, while suppressing development of an amber color that is derived from sodium sulfate. A colored glass plate made of alkali-containing silica glass containing elements of iron, tin and sulfur, wherein the percentage of the total sulfur calculated as SOis at least 0.025% as represented by mass percentage based on oxides, the percentage of divalent iron calculated as FeOin the total iron calculated as FeOis from 60 to 80% as represented by mass percentage, and the percentage of divalent tin calculated as SnOin the total tin calculated as SnOis at least 0.1% as represented by mol percentage.

Colored glass plate

This high-strength steel pipe includes, by mass %, C: 0.02% to 0.09%, Mn: 0.4% to 2.5%, Cr: 0.1% to 1.0%, Ti: 0.005% to 0.03%, Nb: 0.005% to 0.3%, and a balance consisting of Fe and inevitable impurities, in which Si, Al, P, S, and N are limited to 0.6% or less, 0.1% or less, 0.02% or less, 0.005% or less, 0.008% or less, respectively, the bainite transformation index BT is 650&#xb0; C. or less, and the microstructure thereof is a single bainite microstructure including first bainite and second bainite, the first bainite being a gathered microstructure of bainitic ferrite including no carbide, and the second bainite being a mixed microstructure of bainitic ferrite including no carbide and cementite between the bainitic ferrites.

High-strength steel pipe and producing method thereof

To provide glass for a data storage medium substrate, whereby high heat resistance can be obtained. Glass for a data storage medium substrate, which comprises, as represented by mol percentage based on the following oxides, from 55 to 70% of SiO, from 2.5 to 9% of AlO, from 0 to 10% of MgO, from 0 to 7% of CaO, from 0.5 to 10% of SrO, from 0 to 12.5% of BaO, from 0 to 2.5% of TiO, from 0.5 to 3.7% of ZrO, from 0 to 2.5% of LiO, from 0 to 8% of NaO, from 2 to 8% of KO and from 0.5 to 5% of LaO, provided that the total content of AlOand ZrO(AlO+ZrO) is at most 12%, and the total content of LiO, NaO and KO (RO) is at most 12%.

Glass for data storage medium substrate, glass substrate for data storage medium and magnetic disk

The present invention provides an alkali-free glass having a high strain point, a low viscosity and low devitrification, which is easily subjected to float molding and fusion molding. The glass herein has a strain point of 725&#xb0; C. or higher, an average thermal expansion coefficient at 50 to 300&#xb0; C. of 30&#xd7;10to 40&#xd7;10/&#xb0; C., a temperature Tat which a glass viscosity becomes 10dPa&#xb7;s of 1,710&#xb0; C. or lower, a temperature Tat which a glass viscosity becomes 10dPa&#xb7;s of 1,330&#xb0; C. or lower, a glass surface devitrification temperature (T) of 1,330&#xb0; C. or lower, and a glass internal devitrification temperature (T) of 1,330&#xb0; C. or lower.

Alkali-free glass and method for producing same

Growing community of inventors

Tokyo, Japan

Kensuke Nagai