Marx K.,VDEh Betriebsforschungsinstitut GmbH |
Rodl S.,VDEh Betriebsforschungsinstitut GmbH |
Seemann M.,Verfahrenstechnik und Produktentwicklung |
Demant A.,Buderus Edelstahl GmbH
Stahl und Eisen | Year: 2014
Ingot casting products often must fulfil highest requirements concerning steel cleanness and homogeneity. Concerning these requirements flow conditions and the course of solidification during the casting process are of essential importance. In a physical model flow conditions during the filling process were investigated via flow visualization and laser-optical measuring. Also numerical simulation with an enhanced computational fluid dynamics (CFD) program was performed in order to get further information on inclusion behaviour and separation as well as solidification. Measures for the optimization of the ingot casting process were elaborated.
Marx K.,VDEh Betriebsforschungsinstitut GmbH |
Rodi S.,VDEh Betriebsforschungsinstitut GmbH |
Schramhauser S.,Buderus Edelstahl GmbH |
Seemann M.,Buderus Edelstahl GmbH
Metallurgia Italiana | Year: 2014
Ingot casting is an important process for the production of special steel products e.g. for power generation and automobile industry or offshore applications. These products must fulfill highest requirements concerning steel cleanness and homogeneity. Concerning these requirements flow conditions and the course of solidification during the casting process are of essential importance. Against this background systematic investigations were performed concerning these phenomena by application of advanced physical and numerical simulation methods. In a physical model flow conditions during the filling process were investigated via flow visualization and laser-optical measuring systems. Important information concerning the time-dependent flow condition and quantitative information on flow velocities were obtained. Also numerical simulation with an enhanced CFD programme was performed in order to get further information on inclusion behavior with regard to inclusion separation, mould powder entrainment and solidification. The influence of the feeding system design, the filling rate as well as temperature conditions with a special view to the hot top design was assessed. Optimized constructive and process parameters were elaborated. The results prove the potential of developing a better controlled casting and solidification process by application of physical and numerical simulation methods.
Zybill C.,Karl Buch Walzengiesserei GmbH and Co. KG |
Goryany V.,Karl Buch Walzengiesserei GmbH and Co. KG |
Buch J.,Karl Buch Walzengiesserei GmbH and Co. KG |
Myronova O.,University of Duisburg - Essen |
Romschied M.,Buderus Edelstahl GmbH
Stahl und Eisen | Year: 2015
Rolls in late finishing stands of hot strip mills often experience the shortest operation times of the whole production line because of excessive wear. At Karl Buch a new graphitized HSS roll material, Teranit F, was developed. Test rolls with this material were run at a German narrow strip mill show a significantly improved wear behaviour as well as superior product quality compared to conventional ICDP rolls (performance improvement by a factor of 2.3). Teranit F has the potential to allow a synchronization of the roll changes of the late finishing stands with earlier stands and to significantly reduce the total cost of ownership TCO of a mill.
Rech R.,Steel Institute VDEh |
Rech R.,Buderus Edelstahl GmbH |
Letz K.,Steel Institute VDEh
Stahl und Eisen | Year: 2012
To optimize the efficiency of the forging equipment and also to minimize material and energy input, the member companies organized in the Forging Committee of the Steel Institute VDEh realized new ideas and invested into the modernization of its production plants. This paper gives an overview about the companies' forging plants and the investments into innovative forging presses, manipulators and rotary forging plants. Also actual developments like integrated simulation calculations will be presented. These will enable the production of high-grade forgings.
Weirather T.,University of Leoben |
Fian A.,Joanneum Research |
Sartory B.,Materials Center Leoben Forschung |
Caliskanoglu D.,Bohler Edelstahl Gmbh |
And 3 more authors.
Surface and Coatings Technology | Year: 2012
Recently, carbide-free alloying systems with yield strength R p0.1 of up to 4000MPa and outstanding thermal stability are available, which offer the possibility to elevate coating deposition temperatures up to 600°C. The present work demonstrates that the limited Ti 1-xAl xN coating adhesion on a Fe-25%Co-15%Mo grade caused by the absence of carbides in the substrates can be significantly improved from HF 4 to HF 2 in the Rockwell adhesion test by plasma-assisted nitriding during sputter etching. X-ray photoelectron spectroscopy measurements reveal that the nitrogen diffusion zone is confined to the first few nanometre of the substrate surface, while mainly Mo-N and partly Fe-N bondings are formed. X-ray diffraction exhibits the formation of cubic Mo 2N in the nitrided layer. The coatings show a single-phase face-centered cubic Ti 1-xAl xN structure tending to a preferred (110) growth orientation with increasing nitriding time. Tribological tests performed at room temperature and 650°C indicate superior wear performance of duplex Ti 1-xAl xN coated Fe-25%Co-15%Mo. © 2012 Elsevier B.V.
Hippenstiel F.,Buderus Edelstahl GmbH |
Mohrbacher H.,NiobelCon Bvba
Materials Science and Technology Conference and Exhibition 2011, MS and T'11 | Year: 2011
Increasing demands with regard to performance of carburizing steels necessitate the further development of process technology as well as steel metallurgy. The present paper exemplifies recent developments based on alloy modifications with microalloying elements, which not only enhance the performance of existing carburizing steel types but also allow the application of new processing technologies. The focus is thereby on molybdenum alloyed carburizing grades that are typically applied e.g. in large gear for windmills. A dedicated addition of niobium enables better mechanical properties and higher carburizing temperatures. Simultaneously the carburizing time can be shortened and distortion by heat treatment is reduced, as the microstructure remains more homogeneous. Further development potential offered by microalloying in carburizing steels is seen in an improved toughness due to the finer sized grain structure allowing to produce higher strength and more economical steel. These measures when applied in new steel concepts enable significant cost savings along the entire manufacturing chain especially in the production of larger transmissions. Finally, additional cost savings can be expected by a reduction and optimization of processes and procedures at the end-user. Copyright © 2011 MS&T'11®.
Buderus Edelstahl GmbH | Date: 2013-03-29
A mold material having a material hardness higher than 340 HB and a fine-grain structure. The mold material having a composition in weight percent that includes:
Buderus Edelstahl GmbH | Date: 2013-04-16
Buderus Edelstahl GmbH | Date: 2011-11-14
Buderus Edelstahl GmbH | Date: 2012-05-04
Common metals and their alloys, in particular iron alloys for moulds for objects of plastic.