More recently modified stainless steels have been used to produce various structural elements that work in complex operating conditions. Stainless steel X8CrNiS18-9 (standard EN 10088-3: 2005) is the most commonly used austenitic stainless steel due to its good machinability. This steel has high mechanical and working properties than...

By Derviš Mujagić, Aida Imamović, Mustafa Hadžalić

The paper describes the determination of the mechanical properties of the spherical floors of pressure vessels, obtained by the welding process and shaped by the process of gradual local deformation in the cold state, i.e. by the process of Incremental sheet forming (ISF). Spherical cylindrical bottoms are an integral part of most cl...

By Mustafa Hadžalić, Raza Sunulahpašić, Zlatan Ištvanić

Long-term exposure of superheater and steam intermediate superheater pipe materials to high temperatures in the operating conditions that prevail in thermal power plants leads to the appearance of the oxide layer.Oxide layer forms on the inner wall of the pipe, which acts as a heat insulator and reduces heat transfer through the pipe...

By Belma Fakić, Adisa Burić, Edib Horoz

The mechanical properties and microstructure of copper base shape memory alloys are relatively well known, while data on thermal properties (thermal conductivity, specific heat, and temperature conductivity) are not available. In the frame of our investigation work thermal properties of rapidly solidified Cu-Al-Ni-Mn alloy were deter...

By Borut Kosec, Blaž Karpe, Milan Bizjak, Ladislav Vrsalović, Diana Ćubela, Mirko Gojić, Ivana Ivanić, Stjepan Kožuh

In this paper, C45 medium carbon tool steel was investigated after various heat treatments. The thermal properties, specifically thermal diffusivity and thermal conductivity, were measured and also the microstructure analysis was done on a light microscope. Heat treatment of the samples included: 1) the normalization heat treatment a...

By Uroš Stamenković, Ivana Marković, Srba Mladenović, Dragan Manasijević, Ljubiša Balanović, Avram Kovačević, Milan Nedeljković, Jovana Božinović

This paper describes the process of degradation of the structure of the inlet header of the intermediate reheater (MPr) 2 input header at the boiler of Unit 7 of the Thermal Power Plant Kakanj, determined on the basis of tests of replicas and hardness at characteristic places of the header. Headers, with minor delays, have been in co...

By Armin Husika, Belma Fakić, Milenko Rimac

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

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

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

Some specific aspects in the improvement processes related to I-beams production, especially related to the conversion of classical to the universal rolling mills stands are presented in this paper. One of practical solutions in the a.m. conversion is described in some more details, as well as some of better designs in the variety of I-beams, conce...

By Faik Uzunović, Omer Beganović, Lamija Sušić