Kobe Steel, Ltd.

Kabushiki Kaisha Kobe Seiko Sho

Doryokuro Kakunenryo Kaihatsu Jigyodan

Toshio Fukuzuka

Kazutoshi Shimogori

Hiroshi Satoh

Katsuyuki Ohtsuka

Tatsuo Hara

Yasushi Torii

Fumio Kamikubo

Hitoshi Miyazaki

Ryukichi Mizuno

Takuo Hosoda

Kenji Wakayama

Fumio Kami Kubo

Kohjiro Kitahata

Masaaki Urai

Disclosed herein is a rolled steel having excellent resistance to sulfide stress corrosion cracking. It comprises 0.20-0.40 wt. % C, .ltoreq.0.50 wt. % Si, .ltoreq.1.90 wt. % Mn, .ltoreq.0.06 wt. % Al, 0.0030-0.0090 wt. % N, 0.005-0.10 wt. % Nb, 0.005-0.050 wt. % Ti, and the balance iron and inevitable impurities. The rolled steel contains at least 4.times.10.sup.8 ultrafine carbonitride particles or 0.1 .mu.m or smaller per mm.sup.3 as a result that a bloom or slab having the above components is soaked, subjected at 1200.degree.-950.degree. C. to rough rolling under conditions of a total reduction percentage of 75% or lower, cooled at a cooling rate of 1.5.degree. C./sec. or higher after completion of the rough rolling and until the initiation of finish rolling, and then completed with its final rolling above the A.sub.1 transformation temperature. A process for producing the above rolled steel is also disclosed.

Method of producing rolled steel having excellent resistance to sulfide

A method of minimizing corrosion deterioration and hydrogen absorption embrittlement of tantalum encountered in performing acid digestion of organic waste matter put in an acid digestion kettle of tantalum containing high temperature high concentration sulfuric acid includes the addition of nitric acid, nitrous acid, nitrates, nitrites and/or nitrogen oxides to the sulfuric acid bath.

Method of stabilized operation of acid digestion kettle of tantalum

The invention discloses a process for one-sided, hot-dip coating which includes guiding and causing a metal sheet to be coated to travel over a molten metal bath by means of a pair of guide rolls disposed above the bath; sucking a hot-dip coating metal inside the molten metal bath by an electromagnetic pump disposed outside the bath and jetting the hot-dip coating metal through the molten metal bath from a nozzle protruding beyond the surface of the bath between the pair of guide rolls; and bringing the hot-dip coating metal thus jetted into contact with the lower surface of the metal sheet over its entire range in its transverse direction while the metal sheet is travelling, thereby forming a coating layer of the hot-dip coating metal on the lower surface of the metal sheet.

Process for one-side hot-dip coating

A sacrificial anode for use in preventing corrosion of copper alloy parts and hydrogen absorption in titanium or titanium alloy parts of an apparatus useful for treating hot sea water, comprising a metal or metal alloy which maintains the potential of said copper alloy parts and titanium or titanium alloy parts serving as cathodes in said apparatus in the range of -0.5 to -0.65 V, relative to the potential of a saturated calomel electrode.

Sacrificial anode and apparatus employing same for treating hot sea water

An electrolytic cell for use in various electrolytic treatments such as the sterilization of sea water includes a plurality of monopolar bar type electrodes, and an electrolytic solution filled in clearances between the electrodes. At least one group of electrodes disposed in the electrolytic cell is arranged so that one electrode is located at the center of an equilateral hexagon and the other electrodes are located at apexes of the hexagon.

Electrolytic cell with electrodes arranged as a hexagon

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Kobe, Japan

Toshio Fukuzuka