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Wetzlar, Germany

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.

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.

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®.

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.

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.

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