Zonguldak, Turkey
Zonguldak, Turkey

Time filter

Source Type

Akca E.,Eregli Iron Steel Works Inc. | Cimen D.,Eregli Iron Steel Works Inc. | Ozyigit M.B.,Eregli Iron Steel Works Inc.
TMP 2016 - 5th International Conference on ThermoMechanical Processing, Advance Programme | Year: 2016

The purpose of this study is to investigate the effect of thermo-mechanical simulations on low carbon V-N microalloyed high yield strength hot rolled steels at Gleeble 3500 thermo-mechanical simulator. Plane Strain tests have been performed at a laboratory scale which is the best method to simulate the hot rolling of steels. The effect of different deformation rates and thermal cycles on mechanical properties and microstructure were examined. Micro hardness test results of specimens were compared. Sample characterizations were done with Light Microscope and further investigations performed with EBSD method. Different deformation rates and cooling cycles showed us significant changes on hardness values and phase distributions. © 2016, ThermoMechanical Processing (TMP). All rights reserved.

Esmer M.,Eregli Iron Steel Works Inc. | Ozyigit H.A.,Bülent Ecevit University
Transactions of the Indian Institute of Metals | Year: 2017

Copper staves are widely used as cooling systems for blast furnaces. Since the inside wall of the furnaces are completely covered with copper staves, the failure of the system plays a significant role for premature blast furnace relining. Especially the bosh area is the critical part of blast furnaces because it faces high heat load. The damage to the bosh area directly affects the service period of BF’s. The lifetime of furnaces can be prolonged considerably by preventing the premature damage of this section. For this purpose, a new approach has been introduced to define the premature risk factor of copper staves based on design and operation parameters. The data of 34 different blast furnaces obtained from the members of World Steel Assoc. are applied to this new approach to calculate the premature risk factors. The results are recorded and analyzed according to service lifetime and actual wear situations of copper staves. Finally, all these analyzes show that the new approach, which is represented in this paper can be a new design check parameter for blast furnaces and a practical solution to define the premature wear risk of copper staves. Therefore, blast furnace designers and users can extend the blast furnace lifetime by using this new approach resulting in high economic benefits. © 2017 The Indian Institute of Metals - IIM

Yetmez M.,Bülent Ecevit University | Kocer L.,Eregli Iron Steel Works Inc. | Erdogan H.,Bülent Ecevit University | Demirci I.,Eregli Iron Steel Works Inc.
Materialwissenschaft und Werkstofftechnik | Year: 2015

In this study, the vibro-acoustic behaviour of centrally damaged honeycomb cored sandwich panels is investigated experimentally. For this purpose, experimental evaluations are completed by the followings: (I) honeycomb sandwich panels with two different core materials and the same skin materials are considered, (II) low-velocity impact measurements with three different projectiles are obtained, (III) vibration and vibro-acoustic tests are performed to present the vibration characteristics of the post-impacted sandwich panels with two different boundary conditions. Effect of core material and projectile geometry on modal and sound characteristics is examined. The results are given in tabular and graphical forms. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Yetmez M.,Bülent Ecevit University | Erdogan H.,Bülent Ecevit University | Kocer L.,Eregli Iron Steel Works Inc. | Demirci I.,Eregli Iron Steel Works Inc.
Advanced Materials Research | Year: 2014

In this study, dynamic analysis of carbon plain weave square plates with different damage patterns including pattern of post-low velocity impact and patterns of post-ballistic impact is considered. For this purpose, vibration tests are performed to present the vibration characteristics of the four-edge clamped square plates. Effects of bullet-tip geometry, projectile velocity and impact damage location on the vibration characteristics are examined experimentally. Results are given in graphical form. © (2014) Trans Tech Publications, Switzerland.

Altan E.,Yildiz Technical University | Uysal A.,Yildiz Technical University | Anac S.H.,Eregli Iron Steel Works Inc. | Ozturk S.,Abant Izzet Baysal University
International Journal of Advanced Manufacturing Technology | Year: 2016

In interrupted cutting, chips occur as intermittent and cutting tool may be damaged under severe variable loading. And it is known that the cutting forces cause transverse cracks on the rake face, and cutting tool may be damaged during interrupted cutting under mechanical and thermal fatigue in a short period of time. In this work, carbide inserts and forged SAE 4340 workpiece with axial slots were used in interrupted turning. The hardness values of some points on rake face near the cutting edge were measured, and cracks and failures on cutting tool were displayed by scanning electron microscopy (SEM). Additionally, milling experiments were conducted with carbide inserts on C45 medium carbon steel. In the interrupted cutting, the effect of work hardening of cobalt in sintered carbide cutting tool on tool failure was investigated. According to the results, micro hardness of sintered carbide cutting tool increased due to work hardening of cobalt, and this caused the micro crack formation on cutting tool. © 2016 Springer-Verlag London

Ertem M.E.,Eregli Iron Steel Works Inc. | Sen S.,Dokuz Eylül University | Akar G.,Dokuz Eylül University | Pamukcu C.,Dokuz Eylül University | Gurgen S.,Dokuz Eylül University
Energy Sources, Part A: Recovery, Utilization and Environmental Effects | Year: 2010

Eregli Iron and Steel Works Co. (Erdemir) is the largest integrated steel plant in Turkey. In this study, the potential for improving the specific energy use of slab furnace #3 of this plant was analyzed. An energy input and output model was established in order to determine the lost energy in the process. According to the study, energy efficiency of slab furnace #3 was calculated as 64.26%. Even though it seems to be a reasonable efficiency value for a slab furnace, it was noticed that further energy conservation can still be achieved by increasing the temperature of hot charging to the slab furnace and recovering the flue gas sensible heat remaining after the recuperator.

Ertem M.E.,Eregli Iron Steel Works Inc. | Sen S.,Dokuz Eylül University | Akar G.,Dokuz Eylül University | Pamukcu C.,Dokuz Eylül University | Gurgen S.,Dokuz Eylül University
Energy Sources, Part A: Recovery, Utilization and Environmental Effects | Year: 2010

Specific energy consumption analysis of the integrated steel plants in Turkey was performed in this study by using the data of 2003-2005. Specific energy consumptions of three integrated steel plants were determined as follows: 30.3 GJ/TCS for Karabuk Iron Steel Works Co.; 29.8 GJ/TCS for Iskenderun Iron Steel Works Co.; and 21.5 GJ/TCS for Eregli Iron Steel Works Co. The results of the specific energy consumption analysis indicated that Eregli Iron Steel Works Co. (Erdemir) has the lowest specific energy consumption for steelmaking process in Turkey. The energy structure and management processes providing sustainability in Erdemir integrated steel plant was presented in detail.

Akkaya A.B.,Eregli Iron Steel Works Inc. | Copur H.,Technical University of Istanbul
International No-Dig 2015 Istanbul Conference and Exhibition | Year: 2015

This study is about a waste water collection and treatment project to prevent pollution of sea water in Bosporus. The study includes 3 different microtunneling projects on which the same slurry type Herrenknecht AVN1800C microtunneling machine was used in Istanbul. Daily advance rates, net cutting rates, machine utilization ratios are investigated based on daily shift records, machine data logging records and visual in situ observations in different project sites. Lithological units and their properties are summarized based on the borehole reports and project documents. An empirical model is developed for predicting net cutting rate of the microtunneling machine. The dominant lithology is clay in all project sites investigated. Total driving length of the projects is 1000 m. The achieved best daily advance rate is 27.07 m/day. Average of the net cutting rates in all project sites is obtained as 1.96 m/h for these 3 projects. The highest average net excavation rate is achieved as 4.24 m/h in Kurbagalidere site and it varies between 1.1 m/h (Cirpici site) and 1.34 m/h (Nakkasdere site). Statistical analysis is performed to investigate the effects of some ground related parameters (natural water content, plastic limits, liquid limits, plasticity index, SPT-standard penetration values, and TCR-total core recovery) on net cutting rates. The best relationship is obtained with SPT values being lower than 15. Net cutting rate decreases with increasing SPT value. The model is valid for slurry microtunnel boring machines with 2.5 m of excavation diameter and clay-silt lithology with SPT values lower than 15.

Ertem M.E.,Eregli Iron Steel Works Inc.
Energy Sources, Part B: Economics, Planning and Policy | Year: 2010

Eregli Iron and Steel Works Co. (Erdemir) began its activities on May 15, 1965 with an annual production capacity of 450.000 t and has made important contributions to Turkey's economy ever since. Today, with a total amount of crude steel production capacity exceeding 3.000.000 t, it is the largest iron and steel factory and the sole producer of flat steel in the country. Erdemir produces hot and cold rolled coils, zinc, tin, and chromium plated steel. Erdemir has attained the production potential of its entire power requirement amounting to 1.2 billion Kwh/y in the power plant. However, it continues to purchase electricity amounting to 15% of its total production capacity from the Turkish Electricity Authority national system in order to meet the fluctuating loads, which occur during the hot rolling process. The installed energy production capacity of Erdemir has reached 155 MW (195 MW in 2008) with two steam turbine generators, which were put into service in 1965 with a 10 MW capacity each; a steam turbine, which was put into service in 1978 with a 30 MW capacity; two gas turbine generators, each of which was put into service in 1997 with a 40 MW capacity; and a steam turbine generator/motor blower which was put into service in 2001 with a 25 MW capacity. The steam production capacity is 750 t/hr of which 600 t/hr is produced in five steam boilers and 160 t/hr is produced in two co-generation facilities. In this study, as the control volume, the limits of co-generation plant No. 1 in Erdemir have been chosen for a detailed energy balance analysis. By the identification of the energy sources that move in and out of the control volume, the energy output sources have been categorized as fractioned. For the implementation of the method, the balance study has been chosen. Thanks to this study, major energy losses have been determined. According to our calculations energy efficiency of the furnace was founded as 77,2%. It seems that Erdemir co-generation plant No. 1 has a highly energy-efficient production for sustainable energy generation. Erdemir co-generation plant has also been rewarded as the second most-efficient co-generation plant of Turkey by the Ministry of Energy in 2002. This study also aimed to show the importance of the energy balance of plants, in order to find energy losses from the process. The losses can be recovered to use primary energy sources effectively. Copyright © Taylor & Francis Group, LLC.

Derin B.,Technical University of Istanbul | Alan E.,Eregli Iron Steel Works Inc. | Suzuki M.,Osaka University | Tanaka T.,Osaka University
ISIJ International | Year: 2016

In the present study, the impurity capacities (Ci) of phosphate, phosphide, nitride and carbide in binary and multi-component molten melt systems at different temperatures were estimated using the artificial neural network approach. The experimental data taken from the previous studies were introduced to the artificial neural network, then the calculated results were plotted against the experimental values for comparative purposes. Besides, iso-phosphate capacity contours on the liquid region of CaO-CaF2-Al2O3 ternary phase diagram at 1 773 K were generated and plotted by using the neural network model results. The calculated results obtained through neural network computation agreed well with the experimental ones and were found more accurate than those estimates based on some models. © 2016 ISIJ.

Loading Eregli Iron Steel Works Inc. collaborators
Loading Eregli Iron Steel Works Inc. collaborators