Georgsmarienhütte, Germany
Georgsmarienhütte, Germany

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Cancarevic Z.,Georgsmarienhutte GmbH | Spinneker K.,Georgsmarienhutte GmbH | Budak M.,Georgsmarienhutte GmbH | Schmidt M.,Georgsmarienhutte GmbH | And 2 more authors.
TMP 2016 - 5th International Conference on ThermoMechanical Processing, Advance Programme | Year: 2016

The ability to predict microstructure helps significantly in producing of the high quality final product while ensuring the cost-effective operation of the steel plant. Thermomechanical processing of steel refers to technologies aimed at controlling the microstructure and the mechanical properties during deformation and accelerated cooling. Such process could reduce the cost of steel manufacturing by minimizing or even eliminating the heat treatment after hot deformation. However it has even bigger advantage, which is the possibility of controlling microstructure and physical properties of steel by means of robust design. This paper addresses the Thermomechanical processing application of a fully integrated system for real-time prediction of material properties. A hybrid model for determining properties of rolled bars which combines technological capability of a process model with learning ability of machine learning (ML) technology has been developed. A comprehensive model capable of predicting the microstructure change within hot bar during subsequent processing stages (rolling and cooling) has been applied. A system based on the proposed algorithm has been implemented and tested. The grain size predictions were validated against experimental measurements. © 2016, ThermoMechanical Processing (TMP). All rights reserved.


Rosch S.,Georgsmarienhutte GmbH | Trojahn W.,Schaeffler Group | Clausen B.,University of Bremen
HTM - Journal of Heat Treatment and Materials | Year: 2016

The performance of large case hardened rolling contact bearings is dependent on the properties of the surface layers of the rolling partners subjected to strain. This is especially true under challenging conditions like poor lubrication and/or overrolling of particles. Those properties are mainly affected by the chemical composition of the base alloyed steel and the amount and distribution of induced carbon respectively carbon and nitrogen (carbonitriding). For optimization purposes 11 case-hardening or tempering steels were carbonitrided under varying gas compositions towards approximately equal hardening depths. The surface layers were characterized and chosen states of texture were tested for thermal and mechanical stability. Conclusively capability tests for rolling contact bearings were conducted by overrolling tests of discs and angular ball bearings under varying overrolling conditions. The best overall test results with regard to production costs were achieved by the carbonitrided air melted steel grade 32MnCrMo6-4-3. © 2016 Carl Hanser Verlag GmbH & Co. KG.


Bandusch L.,AcelorMittal Hamburg GmbH | Dettmer B.,Georgsmarienhutte GmbH | Fandrich R.,Steel Institute VDEh | Kleimt B.,VDEh Betriebsforschungsinstitut GmbH | And 3 more authors.
Stahl und Eisen | Year: 2012

After the major decline in 2009, the European steel industry is still struggling to reach the pre-crisis level. The steel production with EAF is under constant improvement which can be seen by an increase in efficiency. Examples thereof are process automation as well as the use of off-gas energy for scrap preheating or steam generation. Simultanously, the performance of new plants is also increasing. One crucial challenge for the future of the European steel industry, if not today already, is the availability of electrical energy. Weak distribution grids as well as rising electricity prices are at hand.


Jansen T.,University of Hamburg | Kruger K.,University of Hamburg | Schliephake H.,Geschaftsfuhrer Technik | Dettmer Und B.,Leitung Schmelzbetrieb | Deng J.,Georgsmarienhutte GmbH
Stahl und Eisen | Year: 2010

Based on the acoustic sound emission and the electrical parameters, an algorithm for foaming slag detection at a DC-EAF is presented. Regardless of the currently applied electrical power, the model provides a reliable estimate of the slag level. Empirical studies at the DC-EAF of the Georgsmarienhütte GmbH demonstrate the applicability of the signal as a slag index. Thus a robust tool is given to detect a poorly shielded arc at an early stage. In a second step the slag signal was integrated into an existing power control concept. Aim is to adjust power input dynamically to the process conditions.


Kleimt B.,VDEh Betriebsforschungsinstitut GmbH | Dettmer B.,Georgsmarienhutte GmbH | Haverkamp V.,Helmut Schmidt University | Deinet T.,Forschungsgemeinschaft Feuerfest E.V. | Tassot P.,Calderys Deutschland GmbH
Chemie-Ingenieur-Technik | Year: 2012

The electric arc furnace is the most important steelmaking process on the basis of recycling of steel scrap. The major part of the production costs is caused by the consumption of electrical and chemical energy and the charge materials. The energy and material efficiency of the process can be increased by reducing the thermal losses and by applying a dynamic process control based on mathematical models and a continuous off-gas analysis. First results are presented. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Schliephake H.,Georgsmarienhutte GmbH | Endemann G.,Leiter Geschaftsfeld Politik
Stahl und Eisen | Year: 2016

Against the background of what the steel industry, the material steel and its properties as well as products made of steel contribute to resource efficiency and recycling, the authors examine the current political developments. This is done on a national and European level for both, resource efficiency on the one hand and environmental protection on the other. On the basis of conflicts with regard to the slags produced during steelmaking due to thermodynamic reasons, the question whether resource efficiency and recycling are politically desirable is comprehensible. The solution requires a holistic approach. Anchoring this in politics and in the awareness of the public is a major challenge.


Biermann D.,Institute of Machining Technology | Hartmann H.,Institute of Machining Technology | Terwey I.,Sandvik AB | Merkel C.,EZM Edelstahlzieherei Mark GmbH | Kehl D.,Georgsmarienhutte GmbH
Procedia CIRP | Year: 2013

Technological properties of components can benefit from the application of modern steel grades. For example, a reduction of fuel consumption or an improvement in vehicle efficiency can be achieved by using high-tensile bainitic steels in automotive industry in order to increase injection pressure in fuel supply. To take advantages like technological progress, sustainability or cost savings the machinability of these materials has to be investigated in order to prepare for a future industrial use of steels with a bainitic structure. In this paper, turning of the bainitic steel 20MnCrMo7+BY in comparison to the quenched and tempered steels 42CrMo4+QT and 50CrMo4+QT is analysed. © 2013 The Authors.


Schwerdt D.,State Materials Testing Institute Darmstadt | Kaiser B.,State Materials Testing Institute Darmstadt | Wuttke U.,State Materials Testing Institute Darmstadt | Hoche H.,State Materials Testing Institute Darmstadt | And 3 more authors.
Materials Science and Technology Conference and Exhibition 2013, MS and T 2013 | Year: 2013

A key benefit of bainitic steels is cost reduction for heat treatment in comparison to traditionally quenched and tempered steels due to absence of one heat treatment step. Nevertheless, new alloying concepts are necessary to ensure success of bainitic microstructures for massive parts. Therefore, the innovative microalloyed bainitic steel 12CrMnMoV7-5 mod, which features a new alloying concept, was subjected to controlled cooling from forging temperature to obtain a bainitic microstructure. All investigations of properties and microstructure were done in comparison to a conventionally quenched and tempered steel 42CrMo4. The aim of this research project was to verify the capability of the microalloyed bainitic steel 12CrMnMoV7-5 mod for forged parts which have to endure cyclic loading. Investigations comprised mechanical properties including static and cyclic fracture mechanics as well as fatigue behavior of smooth and notched specimens. The microstructure-properties correlation was examined by visible-light microscopy (VLM), scanning electron microscopy (SEM) and Electron Back Scatter Diffraction-method (EBSD). Copyright © 2013 MS&T'13®.


Golinske K.,Georgsmarienhutte GmbH | Schliephake H.,Georgsmarienhutte GmbH | Schwarz S.,Friedrich Kocks GmbH and Co KG
MPT Metallurgical Plant and Technology International | Year: 2013

Georgsmarienhutte GmbH has revamped and extended its 3-roll reducing & sizing block (RSB), originally commissioned in 2001. The mill revamping comprised among others the implementation of a size control system in connection with 3-roll stands adjustable under load. Thus the rolled tolerances and their reproducibility could be. improved. Additionally, the existing reducing & sizing block has been extended from five to six stand positions. Georgsmarienhütte GmbH is the first rolling mill worldwide to use this trend-setting technology.


Schliephake H.,Georgsmarienhutte GmbH | Born C.,Tenova Re Energy GmbH | Granderath R.,Tenova Re Energy GmbH | Memoli F.,Tenova Core | Simmons J.,Tenova Core
Iron and Steel Technology | Year: 2011

Georgsmarienhütte GmbH (GMH), Germany, operating at 140 t/h DC EAF initiated a project to replace the cooling system after almost 25 years of continuous operation, including the time it was used for the BOF. The steam production is the best operating practice for flexible heat recovery as the steam can be used for many purposes, relatively easy to transport, and water an inexpensive and non-toxic base. The technology used to turn waste gas energy into steam is Tenova iRecovery. An iRecovery waste gas duct is a tube-tube construction that looks very similar to a conventional cooling duct. An iRecovery system is designed for partial evaporation of the water, typically no more than 5-12% will be evaporated under normal operation conditions, which ensures that there is spare capacity in the cooling system. An iRecovery waste gas ducts work with radiation heat transfer, which is efficient down to approximately 600°C.

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