Sumitomo Metal Industries, Inc.

Sumitomo Kinzoku Kogyo Kabushiki Kaisha

Tohru Matsuo

Hidemasa Nakajima

Masanobu Sueyasu

Seiichi Masuda

Toyosuke Tanoue

Takeo Aoki

Mitsuichiro Fukuda

Shozo Okamura

Takeyuki Hirata

Kantaro Sasaki

Shoji Anezaki

Takashi Okazaki

Masayuki Taga

Takami Ikeda

Yoichi Umeda

Yoshimichi Ohkita

The gasification of solid carbonaceous materials such as coal is achieved by directing a stream containing the carbonaceous materials onto a high temperature hot spot which has been formed on the surface of a bath of molten iron by oxygen jets blown thereagainst, the stream containing the carbonaceous materials emanating from a non-submerged, top-blowing lance, the oxygen jets emanating from the same lance or from different lances, and the bath of molten iron being contained in a reactor such that its total volume remains essentially constant.

Apparatus for gasifying solid carbonaceous materials

A process for refining high-Cr steel, e.g. 13% Cr steel and 18% Cr steel, is disclosed. The process comprises preparing molten iron in a top-and-bottom blowing converter, heating the molten iron to a predetermined temperature, effecting the decarburization of the thus prepared molten iron by blowing oxygen gas through a top lance against the surface of the molten iron to provide a molten steel while, as bottom-blown gas, initially introducing an oxygen-containing gas into the molten steel then changing to an inert gas when the carbon content of said molten steel is reduced to a predetermined level so as to suppress the oxidation of chromium, and tapping the resulting molten steel out of the converter after adjusting the steel composition.

Process for refining high-chromium steels

Gasification of solid carbonaceous materials

A process for producing an ultra-low phosphorus steel containing 0.010% or less of phosphorus is disclosed, which comprises charging a desiliconized pig iron into a top- and bottom-blowing oxygen converter, introducing a slag-forming agent in a powdered form onto the molten iron together with the top-blowing oxygen and introducing a bottom-blowing gas selected from the group consisting of an inert gas, nitrogen gas, oxygen gas, carbon monoxide gas, carbon dioxide gas and mixtures thereof during the oxygen top-blowing or during both the oxygen top-blowing and the subsequent tapping.

Production of ultra-low phosphorus steel

A method of dephosphorization and desulfurization for molten iron alloy containing chromium, which adds to the bath of molten iron alloy flux comprising alkaline-earth metal oxide and alkaline-earth halide and further adds to the same the predetermined quantity of oxidizing agent, so that simple, highly efficient and economical dephosphorization and desulfurization are performable to produce high-chromium steel or stainless steel of high quality, iron oxide, chromium oxide or oxidizing gas are used as the oxidizing agent.

Dephosphorization and desulfurization method for molten iron alloy

A process for dephosphorizing molten pig iron by adding (a) lime, converter slag and/or iron oxide, (b) iron oxide and/or oxidizing gas, and if necessary (c) flourspar and/or soda ash to the molten pig iron stored in a treating vessel in order to adjust the amount of % CaO to correspond to 0.3 to 3.0 times the sum of the amounts of % SiO.sub.2 and % P.sub.2 O.sub.5 and to adjust the amount of total iron to 15 to 50%, in the slag composition after treatment, thereby obtaining a high dephosphorization.

Process for dephosphorizing molten pig iron

Growing community of inventors

Nishinomiya, Japan

Tohru Matsuo