Method of producing cold rolled, silicon-alloyed electric sheets

US3988177A · kind A · utility

Assignee

• Vereinigte Osterreichische Eisen- und Stahlwerke - Alpine Montan Aktiengesellschaft · AT

Inventors

• Karl-Wilhelm Ecker · Waren (Müritz), DE
• Ingeborg Richter · Linz, AT
• Max Mayrhofer · Linz, AT

Key dates

• Filing date: Oct 21, 1974
• Grant date: Oct 26, 1976
• Expiry date: Oct 21, 1994

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D8/1222
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method of producing cold rolled, silicon-alloyed electric sheets from a vacuum decarburized steel involves decarburizing and recrystallizing annealing of the sheets in a continuous furnace. The recrystallization behavior of the sheets is influenced in such a way that a coarse grain and low watt losses are achieved. In the vacuum decarburized melt a manganese content, lying between 0.25 and 0.80% by weight, is adjusted. The slab temperature prior to hot rolling is kept below a particular temperature that depends on the manganese content according to the equation ##EQU1## Hot rolling of the sheets is effected at a final rolling temperature lying above 840.degree. C and the decarburizing and recrystallizing annealing of the cold rolled sheet is carried out over a period of not more than 4 minutes, whereby the carbon content is reduced to less than 0.003% by weight.