Klockner-werke Ag

Klockner Cra Technologie Gmbh

Kloeckner-werke Ag

Ludwig Von Bogdandy

Karl Brotzmann

Hans Kosmider

With the process for the production of iron from an iron-oxygen combination, preferably ore, the iron-oxygen combination is essentially reduced in an ore reduction vessel with a reaction gas from a melting crucible, then supplied to this melting crucible and melted by adding carbon-containing fuels and oxygen-containing gases. According to the invention, the reaction gases escaping from the melted iron are partially subjected to after-burning in the melting crucible. The thus developing heat is largely transmitted to the melted material and the reaction gases are cooled and reduced with reducing agents on their way to the ore reduction vessel.

Process for the production of iron

A method of heating solid, iron-containing materials in a steel-making converter which includes one or more injection nozzles in a lower nozzle plane and one or more injection nozzles in an upper nozzle plane, the nozzles in each plane being capable of supplying carbonaceous fuels and/or oxygen gas into the converter; the method including supplying fluid carbonaceous fuels (oil and/or gas) and oxygen gas through all the injection nozzles to the interior of the converter so that the fuels will burn and preheat the solid, iron-containing materials, these materials eventually forming a melt at the bottom of the converter; stopping the supply of fluid carbonaceous fuels and instead supplying pulverized carbonaceous fuels through the injection nozzles in the lower nozzle plane once the formed melt has a sufficient depth that it contacts the injection nozzles in the lower nozzle plane, stopping the supply of fluid carbonaceous fuels through the injection nozzles in the upper nozzle zone and the supply of pulverized carbonaceous fuels through the injection nozzles in the lower nozzle zone once the formed melt has a sufficient depth that it contacts the injection nozzles in the upper nozzle zone, and supplying oxygen gas (with from time to time, carbonaceous fuels) to the melt from all the nozzles.

Process for improving the use of heat in steel production from solid

A procedure is provided for producing steel from solid, iron containing pieces such as scrap iron, solid pig iron, iron pellets, iron sponge and the like. The iron containing pieces are smelted in a blown oxygen converter equipped with submerged injection devices for oxygen and pulverized fuel. The pieces are first introduced into the converter and preheated and then they are contacted with a sufficient quantity of molten steel to substantially reduce the length of the smelting period and thereby conserve fuel. The molten steel used in the contacting step is recycled from the previous batch after having been retained for the meanwhile in a separate auxiliary ladle.

Method for producing steel from solid, iron containing pieces

A compound steel material of high corrosion resistance is manufactured by alloying a carbon steel carrier material having a carbon content of at most 0.20C and of at least 0.04C with a carbide and nitride forming substance, compounding the alloyed carrier material with a ferritic chromium steel material of normal carbon content, followed by hot-rolling the compound steel material to a hot rolled strip or sheet which is then annealed at a temperature and for a time period sufficient for the carbon content of the ferritic chromium steel coating layer to be reduced to between 0.001 and 0.003% so as to increase the corrosion resistance of the chromium steel material to that of a superferritic material. After annealing, the sheet may be etched and surface-finished or cold-rolled, recrystallization annealed and thereafter surface-finished, such as temper-rolled. The ferritic chromium steel material has at most 0.1% of carbon prior to annealing. The carbide and nitride forming substance may be titanium whose content in the alloyed carrier material is preferably between 0.50% and 2.00%. The thickness of the ferritic chromium steel coating layer is between 50 and 500 .mu.m, the annealing temperature between 650.degree. and 900.degree. C., and the annealing time period between 8 and 72 hours.

Method of manufacturing a compound steel material of a high corrosion

A compound steel material of high corrosion resistance is manufactured by alloying a carrier material of deep-drawing grade with a carbide and nitride forming substance, compounding the alloyed carrier material with a chromium steel material of normal carbon content, followed by annealing the compound steel material at a temperature and for a time period sufficient for the carbon content of the ferritic chromium steel coating layer to be reduced to between 0.001 and 0.003% so as to increase the corrosion resistace of the chromium steel material to that of a superferritic material. Prior to annealing, the compound steel material may be rolled to a fine sheet. The carrier material used in the method of the invention is a deep-drawing steel of at most 0.12% of carbon, while the ferritic chromium steel material has at most 0.1% of carbon prior to the annealing. The carbide and nitride forming substance may be titanium whose content in the alloyed carrier material is preferably between 0.5 and 2%. The thickness of the ferritic chromium steel coating layer is between 50 and 500 .mu.m, the annealing temperature between 650 and 900.degree. C., and the annealing time period between 8 and 72 hours.

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Oberhausen-Sterkrade, Germany

Ludwig Von Bogdandy