High-Ni and/or high-Co, Mo-containing alloy steel is melted and peroxidized to convert Mo contained in the steel into molten Mo oxides. This peroxidized molten steel is treated with a molten slag forming agent comprising at least one basic oxide selected from the group consisting of alkali metal oxides and alkaline earth metal oxides and at least one acid oxide, to form double salts with the said Mo oxides and the said slag forming agent, and then discharging steel slag containing the said doubl...

A flux applied in soldering to a substrate metal formed thereon with a firmly oxidized layer, the flux containing at least stannous chloride, non-oxidation acid and a viscous agent and excluding zinc chloride therefrom.

Both a method and apparatus for producing molten steel are provided wherein ferrous materials rich in carbonaceous materials are fused in a first vessel of a single electric furnace having separate first and second vessels. The carbonized molten metal thus obtained is then pretreated in a separate pretreatment facility to remove contaminants and the pretreated molten metal is then decarburized in the second vessel of the electric furnace. The decarburization of the pretreated metal in the second...

The present invention concerns a method of and a device for directly reducing fine-particle ore in a horizontal reactor with an ore-reducing gas and a heat vehicle, also a gas, in a fluidized bed. The ore-reducing vessel itself comprises a horizontal fluidized-bed reactor (1). The ore (F) is blown into it from below. The heated ore-reducing gas (A) is blown into the reactor through oncoming-gas floors (2). The heat needed for the endothermic reaction is supplied to the reactor at different tempe...

A composition of matter comprising a mass of ferrous scrap pieces compressed together in random orientation forming a network of interlocking pieces has been prepared. This ferrous metal network is impregnated with rare earth metals in amount from 15% to 80% by weight of the impregnated body. The rare earth metal impregnated body is useful for treating high melting metals, particularly to deoxidize or desulfurize steel and to produce nodular iron.

Structurally sound steel ingots are produced by the conventional electroslag process using prereduced iron ore pellets containing as much as 2.8% oxygen pressed into a bar shape as a consumable electrode. A carbon source, such as silicon carbide or titanium carbide, is dispersed in the flux to prevent oxygen transfer from the flux to the ingot thus preventing blowhole porosity caused by the oxygen and allowing production of a structurally sound ingot. Alternatively, ferroalloys can be mixed with...

A fluid-mold casting slag, especially useful for casting nickel and nickel alloy ingots having improved surface and other metallurgical characteristics, contains substantially only fluorides. Preferred composition consist essentially of about 85%-95% CaF.sub.2 and about 15%-5% NaF.

A process for the production of steel with increased ductility in which a sulfur-containing steel melt is deoxidized and, if desired, is supplied with alloying elements, the deoxidized melt is treated with calcium as part of a purification action simultaneously reducing the sulfur content and the reaction is carried out in a casting ladle having a lining free from siliceous oxides. The melt is covered with a synthetic slag free from siliceous oxides and the calcium-containing substance is introd...

Treatment of molten steel in a ladle, which comprises blowing inert gas into the ladle from its bottom, partially immersing a receptacle which covers the portion of the molten steel where the inert gas bubbles out and maintain non-oxidizing atmospheres within the receptacle with the gas so as to prevent oxidation of the molten steel by the slag.

A residue-free brazing composition for brazing together metal parts is based on atomized copper particles dispersed in a fugitive binder to produce brazing paste.