Corrosion behaviors of stainless steels in molten zinc aluminum alloy

Özcan, Emre
High grade galvanized steel in large amounts is needed to match the increasing demand of automotive industry both in our country and in the world. Stainless steels, used in fabrication of zinc bath hardware of continuous galvanizing lines, lose their corrosion resistance due to various mechanisms in such mediums containing molten metals like zinc and aluminum. Consequently they corrode to the levels where they should be taken to maintenance or replaced. In this study, corrosion performance and the effect of typical galvanizing and age treating heat treatments to mechanical properties of 4 newly developed austenitic stainless steels and AISI 316L grade stainless steel were investigated and compared with each other. Experimental studies involved immersion corrosion tests for 168 and 504 hours followed by weight loss determinations and comparisons of corrosion performances of age treated and solution annealed stainless steels. Parallel with corrosion testing, delta ferrite content v determinations with 3 different methods, tensile tests and v-notch impact tests at 4 different heat exposure conditions were carried out and discussed. 2 new stainless steel compositions were selected to be used in fabrication of galvanizing hardware based on the comparisons of corrosion & mechanical performances of candidate steels.


Inclusion control at Çemtaş steel plant
Şahin, Berkay; Sevinç, Naci; Department of Metallurgical and Materials Engineering (2012)
ÇEMTAŞ Steel Plant produces alloy steels used principally by the automotive industry. Demands of customers for cleaner steel with “fewer, smaller and homogenously distributed inclusions” are getting tighter with time. The tight demands of the customers are checked by ultrasonic testing and faulty regions are cut off and scrapped which results in production losses in steel plants. Decreasing production losses due to scrapping by producing cleaner steels is therefore a major concern. The objective of this stu...
Cost efficiency analyses of steel frameworks for economical design of multi-storey buildings
Hasançebi, Oğuzhan (2017-01-01)
In the present study cost efficiencies of various steel frameworks are investigated for economical design of multistorey buildings. A total of thirteen steel frames that incorporate various types of beam-column connection and bracing configuration are considered for detailed and comparative cost analyses. The three multi-storey buildings consisting of 10, 20 and 30 floors are stiffened according to each of the thirteen steel frameworks to yield thirty-nine test frames for numerical applications. First desig...
Fatigue Cracking of Hybrid Plasma Gas Metal Arc Welded 2205 Duplex Stainless Steel
Yurtışık, Koray; Tirkeş, Süha (2014-01-01)
Contrary to other keyhole welding applications on duplex stainless steels, a proper cooling time and a dilution were achieved during hybrid plasma gas metal arc welding that provided sufficient reconstructive transformation of austenite without sacrificing its high efficiency and productivity. Simultaneous utilization of keyhole and metal deposition in the hybrid welding procedure enabled us to get an as-welded 11 mm-thick standard duplex stainless steel plate in a single pass. Me examination on hybrid plas...
Hydrogen control at Çemtaş steel plant /
Suna, Hazal; Sevinç, Naci; Department of Metallurgical and Materials Engineering (2015)
ÇEMTAŞ Steel Plant produces alloy steels used principally by the automotive industry. For this industry, cleanliness of steel is a crucial criterion. In order to satisfy the demands of customers for cleaner steels and decrease the production losses a master thesis named “Inclusion control at ÇEMTAŞ Steel Plant” was started and completed. According to the results obtained in this study, it was concluded that inclusions are not the only cause of defects in the final product and that hydrogen is another import...
Usability of three boron compounds for enhancement of flame retardancy in polyethylene-based cable insulation materials
İBİBİKCAN, Esin; Kaynak, Cevdet (SAGE Publications, 2014-03-01)
It is known that for the production of halogen-free cable insulation materials based on polyethylene, very high amounts of traditional metal hydroxide flame retardants such as 65 wt% aluminum hydroxide are required to fulfill international directives. In this respect, the aim of this study was to reveal possible enhancement effects of three boron compounds on the flame retardancy of two cable insulation materials: low-density polyethylene and its blend with ethylene vinyl acetate both loaded with aluminum h...
Citation Formats
E. Özcan, “Corrosion behaviors of stainless steels in molten zinc aluminum alloy,” M.S. - Master of Science, Middle East Technical University, 2012.