SPECIFIC ASPECTS IN POSITIONING OF THE RE-HEATING FURNACES AT A LAYOUT OF MANY DIFFERENT ROLLING MILS
Some specific aspects in positioning of the re-heating furnaces at a layout of different rolling mills, for a period of about last hundred years in rolling mills practice are presented in this paper. Practical solutions in the above mentioned (a.m.) field are presented for the different rolling mills. Some of the a.m. aspects are explained, confirm...
By Omer Beganović, Faik Uzunović
SPECIFIC ASPECTS IN POSITIONING OF THE RE/HEATING FURNACES AT A LAYOUT OF THE MODERN ROLLING MILS
Some specific aspects in positioning of the re/heating furnaces at a layout of the modern rolling mills are presented in this paper. Theoretical and practical solutions in the above mentioned (further a.m.) field are presented for both, wire rod and light section bar mills. Some of the a.m. aspects are explained, confirming that even unexpected sol...
By Omer Beganović, Faik Uzunović
CALIBRATION OF TEST DEVICE FOR MICROHARDNESS TESTING
Proper calibration of the device is important to prevent potential sources of error, which ensures that the test results most effectively represent the value of the sample being tested. In microhardness testing, the loading force does not exceed 1.96 N. The test surface requires a more complex metallographic preparation, and the smaller the injecti...
By Edib Horoz, Belma Fakić, Adisa Burić, Mirsada Oruč
DETERMINATION OF THE REPRESENTATIVE VOLUME ELEMENT OF DUAL-PHASE STEELS BY 3D TOMOGRAPHY
Dual phase steels are low carbon steels which are thermo-mechanically processed to getting better formability and toughness than ferrite-perlite steels with similar tensile strength. The microstructure of these steels consisting of a ferrite matrix with hard martensitic/ bainitic second phase. The concept of representative volume element (RVE) is c...
By Emina Vardo, Aida Imamović, Jessica Gola
CONTEMPORARY MATERIALS FOR HEAT HARVESTING
In this paper, we have introduced new contemporary materials for heat harvesting, based on thermoelectric effect (or Seebeck effect): rear earth mono-pnictides and graphene. Measure of effectiveness for transformation of heat to electricity is represented with zT factor, which measure heat harvesting potential. zT factor is related with heat and el...
By Siniša M. Vučenović, Jovan P. Šetrajčić, Steva K. Jaćimovski
INVESTIGATION THE POSSIBILITY OF POZZOLANIC CEMENT CEM IV 42,5N PRODUCTION IN CEMENT PLANT KAKANJ
This paper presents an experimental study to evaluate the possibility of CEM IV 42,5N producing by increasing the specific cement surface from 3180 to 3850 cm2 /g. In this paper, fly ash is used as a cement admixture because fly ash possesses both hydraulic and pozzolanic properties. If one part of the clinker, as a major cement admixture, is repla...
By Nevzet Merdić, Nedžad Haračić, Ilhan Bušatlić, Nadira Bušatlić, Amna Karić
CHAMOTTE REFRACTORY CASTABLE PROPERTIES ENHANCING BY OPTIMIZING PARTICLE SIZE DISTRIBUTION
The paper examined the changes in properties of conventional castables composed of a mixture of calcium-aluminate cement and chamotte caused by changes in the particle size distribution. Properties of castable with 20 % cement and „as received“ chamotte were compared with castableofparticle size distribution adapted to the calculated di...
By Marina Jovanović, Adnan Mujkanovic
EFFECT OF DISPERSANT ON GROUND GRANULATED BLASTFURNACE SLAG PARTICLE SIZE DISTRIBUTION DETERMINED BY LASER DIFFRACTION METHOD
Particle size distribution measurements were performed on ground granulated blastfurnace slag by laser diffraction with the powder dispersed in distilled water with sodium hexametaphosphate used as dispersing agent, as well as in pure distilled water and propan-2-ol. Two samples of slag with Blaine fineness 4700 cm2 /g and5500 cm2 /g were tested.Th...
By Adnan Mujkanovic, Marina Jovanović, Amel Zahirović, Mustafa Hadžalić, Nevzet Merdić
EFFECT OF NANOSILICA ADDITION ON CONCRETE POROSITY AND SORPTIVITY
This paper presents an experimental investigation into the effect of nanosilica addition to porosity and capillary absorption of concrete. Three concrete mixtures 0%, 2%, and 4% nanosilicaby weight of cementweretested.The procedure described in ASTM C642-06 was used to determine the total volume of permeable voids.Water absorption and the rate of w...
By Adnan Mujkanovic, Anesa Ključanin, Marina Jovanović, Amel Zahirović, Amna Karić, Nevzet Merdić
HEAT TREATMENT OF LOW ALLOYED STEELS 17CrNiMo6 AND 20CrMo5 – CARBURIZATION
This paper is concerned with carburization heat treatment. Standard carburization generally entails several steps: carburization of the surface layer by carbon diffusion at high temperatures, subsequent hardening and stress relief. This combination of hard surface and resistance to breakage upon impact is useful in parts such as a cam or ring gear,...
By Belma Fakić, Mohamed Fadlalla Mohamed Ahmed, Babekir Ahmed Osman Mohammed, Faik Uzunović