Heller H.P.,TU Bergakademie Freiberg |
Schurmann M.,Huttenwerke Krupp Mannesmann GmbH |
Scholl K.,ArcelorMittal |
Haustein N.,TU Bergakademie Freiberg |
And 2 more authors.
Journal of Physics: Conference Series | Year: 2017
The viscosity of slag is an important characteristic of liquid slags regarding its lubricating effect and mass transfer. For measurement, however, they exhibit considerable differences in the values reported. Therefore, the rotation method, mostly used for high temperatures areas, is investigated regarding the impacts of any geometric inaccuracies. Furthermore, problems in the centering and use of calibration slags are discussed. It appears that, with the use of a more precise rheometer with air bearing, an error of less than +/- 3 % is possible in compliance with geometric critical values and online monitoring of the central operations. The verification was carried out with a blast furnace slag, which is also proposed as a calibration slag. © Published under licence by IOP Publishing Ltd.
Bartusch H.,VDEh Betriebsforschungsinstitut GmbH |
Hauck T.,VDEh Betriebsforschungsinstitut GmbH |
Grabietz H.-G.,Huttenwerke Krupp Mannesmann GmbH
Stahl und Eisen | Year: 2014
Chlorine compounds in the top gas lead to corrosion at pipes, hot stoves and tuyères of the blast furnace. However chlorine issues in the blast furnace have been only little investigated. On base of results from special measurements, mass balance and equilibrium calculations carried out at Hüttenwerke Krupp Mannesmann, this contribution discusses main chlorine inputs and the behaviour of chlorine within the blast furnace process. Suggestions for the handling of chlorine in the process are reflected.
Jahn A.,Vallourec and Mannesmann Deutschland GmbH |
Steinhoff K.-P.,Huttenwerke Krupp Mannesmann GmbH |
Dubberstein T.,TU Bergakademie Freiberg |
Franke P.,Karlsruhe Institute of Technology |
And 9 more authors.
Steel Research International | Year: 2014
In the present work the influence of phosphor on the flowability, the effect on the infiltration of ZrO2 open foam ceramics and the martensite formation as well as the resulting mechanical properties of high alloyed Crï£¿Mnï£¿Ni as-cast steels is studied. Additionally, the effect of phosphor on surface tension is investigated. The study is performed using thermodynamic calculations, static tensile tests, notch-bar impact tests, optical light microscopy, scanning electron microscopy, energy dispersive X-ray analysis, electron backscatter diffraction, and the magnetic scale for the detection of ferromagnetic phase fractions. Maximum bubble pressure method is used to measure the surface tension of the liquid steel. The martensite phase fraction is not significantly influenced with increasing phosphor content. The flowability and the quality of the infiltration of open foam ceramics are improved with increasing phosphor contents. The investigated specimens show an increasing yield and an ultimate tensile strength with higher phosphor contents. The uniform and the fracture elongation as well as the notch impact resistance remain at high values. Moreover, an increase in phosphor content did not significantly change the surface tension of the investigated CrMnNi alloys. The influence of increasing phosphor content on the flowability, the effect on the infiltration of ZrO 2 open foam ceramics, the martensite formation as well as the resulting mechanical properties and the surface tension of high alloyed Crï£¿Mnï£¿Ni as-cast steels are studied. The elongation properties are not influenced by increasing phosphor content. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Babich A.,RWTH Aachen |
Senk D.,RWTH Aachen |
Knepper M.,Huttenwerke Krupp Mannesmann GmbH |
Ironmaking and Steelmaking | Year: 2016
Operation of several blast furnaces proved that waste plastic (WP) injection makes recycling of industrial and municipal organic wastes and coke saving possible. However, the extent and reaction kinetics of plastic conversion are hardly explored yet. Therefore, a comprehensive study on WP characteristics and conversion behaviour under simulated raceway, bird's nest and shaft conditions, as well as on its interaction with coke, has been undertaken. Numerous analytical, laboratory and pilot facilities have been used. has shown that despite favourable chemistry, it is hardly possible to reach a high conversion degree of plastics under the raceway conditions. Consumption of unburned residues in coke bed and in shaft is possible. The effect of this phenomenon on coke reactivity has to be considered as well. © 2016 Institute of Materials, Minerals and Mining.
Fandrich R.,Stahlinstitut VDEh |
Kleimt B.,Betriebsforschungsinstitut GmbH |
Liebig H.,ThyssenKrupp |
Pieper T.,Deutsche Edelstahlwerke GmbH |
And 2 more authors.
Stahl und Eisen | Year: 2011
Since the 1950s, a huge consolidation has taken place within the European steel industry. Today, under increasing efficiency and flexibility of the steel plants also in mass production, more and more sophisticated steel grades are requested. The product portfolio of the plants, which in the end means the market, decides on the aggregates needed for secondary treatment and on the layout of the steel works. This overview outlines the specific characteristics of modern secondary metallurgy for heating, vacuum degassing, efficient vacuum production and measures to ensure steel cleanness and castability. Furthermore it sketches present trends in application and development.
Kopietz B.,Huttenwerke Krupp Mannesmann GmbH |
Beckmann H.-B.,Huttenwerke Krupp Mannesmann GmbH |
Stahl und Eisen | Year: 2015
The idea from the early 1980s to support the blast furnaces at Huttenwerke Krupp Mannesmann GmbH with 100 % high quality coke from the own coke plant could be realized. Therewith an essential contribution for securing the competitiveness and the production site is provided. 30 months after the start in September 2010 the project was completed and the first coke was pushed on 29 March 2014. The largest single investment of Huttenwerke Krupp Mannesmann GmbH was brought to a prosperous end. A remarkable effort stands for the measurements relating media and energy systems as well as infrastructure regarding planning and implementation for the plant manufacturer, the constructors and for the operators of the plants.
Liszio P.,Geschaftsfuhrer KBS Kokereibetriebsgesellschaft Schwelgern |
Lungen H.B.,Stahlinstitut VDEh |
Nelles L.,Huttenwerke Krupp Mannesmann GmbH
Stahl und Eisen | Year: 2012
The blast furnace/converter route will remain the dominant steelmaking process for a long time. Blast furnaces cannot be operated without coke for physical reasons. Five most modern coke oven plants are operated in Germany. The coke oven plant Schwelgern, which was commissioned in 2003, has the largest coke oven chambers in the world. This plant demonstrates the peak of development for the conventional coke oven system. Besides high-quality coke the conventional horizontal coke oven chambers supply high-energy gas for heating or for power production as well as by-products which are converted into useful products. In comparison the heat recovery oven system, which is not used in Europe, produces coke and steam only. For selection of coal used in the conventional coke oven system care has to be taken of avoiding too high a gas pressure during coking. Coke plant operators are today facing the challenge of a tighter coking coal market.
Urban W.,Huttenwerke Krupp Mannesmann GmbH |
Weinberg M.,Huttenwerke Krupp Mannesmann GmbH |
Cappel J.,Cappel Stahl Consulting GmbH
Stahl und Eisen | Year: 2014
The removal of phosphorus from the furnace charge is a well understood process today and is described by using the phosphorus partition ration between metal and slag Lp = (%P2O5)/[%P]. The L p depends on the melt temperature, the Fet content in the slag, slag basicity, slag volume, MgO content in the slag and the steel carbon content. Other parameters are the phoshorus input with the hot metal and the phosphorus content of the steel product specification. Furthermore the results also vary with the individual plant equipment available and the dephosphorization strategy applied.
Nelles L.,Huttenwerke Krupp Mannesmann GmbH |
Beckmann H.-B.,Huttenwerke Krupp Mannesmann GmbH
Stahl und Eisen | Year: 2013
Coke plants in the last 100 years developed from the "necessary evil" to an important part of a modern steelworks. Permanent enhancement of the technology and increasing automation converted the image of coke plants; also the acceptance outside and inside the plants obviously improved. Since the 1960s measures were established with prior positive effects on environmental protection and ergonomic aspects. High-quality coke is an essential goal; it improves performance and operating efficiency of the blast furnaces. A good raw material basis is a precondition.
Reiche J.,Huttenwerke Krupp Mannesmann GmbH |
Baldermann M.,Huttenwerke Krupp Mannesmann GmbH |
Domels H.P.,ThyssenKrupp |
Sprecher M.,Stahlinstitut VDEh
Stahl und Eisen | Year: 2016
"Energy efficiency" is of great importance at the present time. But first of all, there are too many numbers and figures in the issue of energy efficiency in steel production. Usually there are many differences between the theoretical, technical or even weighted values. For the steel industry it is important to identify areas of action and to establish the link to the policy framework on the basis of these values. There are still potentials existing particularly in the field of using waste heat to improve efficiency. But this has to be addressed together with technical developments and political conditions.