SEARCH RESULT

This paper proposes a new method for the assessment of performance of protective oil on galvanized and skin passed sheets. 11 different protective oil products were applied (1 g/m2) to hot dip galvanized and skin passed 66 sheet samples and subjected to Neutral Salt Spray Fog Testing (NSSFT) with 5% NaCl solution. Amount of white rust on the samples has been determined at 2, 6, 9 and 24 hours. Test results showed that application of NSSF test for 9 hours gives best deterministic results.

International Iron & Steel Symposium
UDCS

Özgür KARAKAŞ Erdogan KANCA Faruk CAVDAR Alper AKÜN İbrahim GÖÇER

Flat steel products are coated with zinc to ensure decorative requirements and prevent the steel from corrosion. Galvanized cold rolled (GCR) sheets has three main characteristics for decorative requirements, these are metallic effect, spangle and gloss. High gloss value is one of effective parameter on the customer demand. In order to define influencing factors on gloss value, GCR sheet samples, with different dimensions and produced with different parameters, had been taken. Influencing factors such as zinc coating mass, sheet thickness, chemical composition of zinc coating, line speed were investigated under constant zinc pot metallurgy conditions. This study finds out increase in strip thickness and Al% content of zinc coating leads to increase in gloss value, increase in coating mass leads to decrease in gloss value and gloss-line speed data gives a Gaussian curve where the gloss value reaches a maximum magnitude at about 100 m/min.

International Iron & Steel Symposium
UDCS

Özgür KARAKAŞ Erdogan KANCA İbrahim GÖÇER Alper AKÜN Erkan PÜGE Güzin Müge LÜLE Ali DOĞAN Ahmet ÖZDEMİR

Machining of many polycrystalline shape memory alloys CoNiAl (SMA) has been considerably a new phenomenon. CoNiAl alloys should be made available for final use after being formed, without loss of their shape memory properties. In this study, the effect of cutting parameters on kerf width and dimension tolerance of the Co based Shape Memory Alloy (SMA) have been investigated on the Abrasive Water Jet (AWJ) machine. After the cutting process, kerf width of the samples were investigated. The experimental results showed that water pressure, traverse speed and abrasive flow rate have a great effect on kerf width and dimension tolerance.

International Iron & Steel Symposium
UDCS

Ali GÜNEN Mehmet DEMİR Erdogan KANCA Mustafa Serdar KARAKAŞ Murat YILDIZ Ersan KIRAR M. Mustafa ERŞEN

- Prepainted galvanized (PPG) steel coils, comparing to galvanized coils, have better corrosion resistance and fascinating decorative properties with their color alternatives and glossy appearance. Color of PPG coils, during service period, by the effect of environmental conditions, fades and their surface lose their glossy appearance. This study investigated the color and gloss stability of PPG steel sheet samples, painted with 14 different colors and 3 different paint type. 23 parallel samples were exposed to natural environmental conditions during 2 years at two different locations, Florida/USA and Dörtyol/Hatay/Turkey. For natural tests, environmental meteorological parameters such as temperature, humidity, rain and various weather conditions are recorded monthly. This study shows the effect of natural environment of Dörtyol/Hatay/Turkey location and the regions similar meteorological conditions like Dörtyol/Hatay/Turkey on color and gloss of PPG coils.

International Iron & Steel Symposium
UDCS

Özgür KARAKAŞ Tuğçe TUNÇBİLEK TOP Erdogan KANCA Hatice Arslan Hazar Çelik Fahri Akça Güzin Müge LÜLE

Red iron oxide which is produced by regeneration of waste hydrochloric acid from steel pickling line contains chloride. Chloride has negative effects on industrial productions which use red iron oxide as a raw material. This paper asserts red iron oxide particles have different chloride content according to their particle size. Regenerated red iron oxide was sampled from different production batches and these samples were grouped according to their particle size with sieving them from 1 mm to 75 µm. Sieved red iron oxide samples were analysed with spectrophotometer to determine chloride content. The study found out that chloride content slightly increased by increasing particle size up to 710 µm, after that size chloride content was drastically increased, such that, removing particles bigger than 1 mm from the iron oxide provides a 11,97 % reduction of the total chloride content and causes only 0,27 % loss from the total material.

International Iron & Steel Symposium
UDCS

Özgür KARAKAŞ Erdogan KANCA İbrahim GÖÇER Alper AKÜN Erkan PÜGE Güzin Müge LÜLE Tuğçe TUNÇBİLEK TOP

Titanium (Ti) + Niobium (Ni) doped Interstitial Free (IF) steel grades (Ti + Nb IF steel) are widely used in steel industries because of their good formability properties. In this study, the effect of cold rolling reduction rate on the microstructure and mechanical properties of IF steel was investigated in details. The samples subjected to cold rolling with various reduction rates ranging from 40% to 80% at constant annealed temperature. The changes in microstructure were examined with optical microscope. Mechanical properties such as cupping values, anisotropy values (r) yield strength, tensile strength and elongation. were examined by Erichson and tensile test. The results affects the microstructural evolution and carbide precipitations significantly, in turn altering the mechanical properties. Increasing amount of cold rolling reduction rate resulted for an increase in the cupping values, anisotropy values, yield strength and elongation, whereas it leaded to a decrease in tensile strength. As a result of this trial experiment it can be said that reduction rate has a great effect on mechanical and microstructure properties of Ti+Nb doped IF steel. clearly demonstrated that the reduction rate of cold rolling.

International Iron & Steel Symposium
UDCS

Ali GÜNEN M. Mustafa ERŞEN Erdogan KANCA Murat YILDIZ Mehmet DEMİR Bülent KURT Mustafa Sabri Gök

A key factor in ensuring sustainable occupational health and safety culture is an established occupational health and safety culture. Occupational health and safety culture is the whole set of behaviours feeling all over the organization in terms of approach, perception, behaviour, commitment. Proactive, that is to say, "the accident without seeing the missing and healing" approach. In order to establish a proactive environment approach, the concept should be supported by national / internationally accepted practices and specific methods. Various materials can be used at this stage. For example; trying to make determinations about unsafe behaviors and / or situations with (more) eyes at a certain point in the organization. In this way, many employees wearing OHS glasses are provided and serious improvements can be made. Another case study is the study of the reports of the insufficiently cheap unsafe conditions and behaviors, which are termed "near miss”. It is the last point where employees are warning each other about insecure approaches and work, that safety behavior is not a "natural drive", but that every employee wakes up each other. In this regard, the bradley curve suggests that a proactive and sustainable OHS approach can achieve the "0" accident target, stimulating each other as a living organism composed of cells. It has been observed that the OHS culture was placed in the organization by various applications mentioned above

International Iron & Steel Symposium
UDCS

Ali GÜNEN Cumhur KOCAMAN Ulus Kürşat ŞERİFOĞLU Erdogan KANCA