Abstract = 65 times | PDF = 52 times
This study deals with the effect of annealing temperature on the mechanical properties of SG 255 steel. Furthermore it aims to experimentally obtain better mechanical properties in particular ductility with lower annealing temperature and to minimize the cost of the manufacturing. The SG 255 steel is used in manufacturing of domestic LPG cylinder at Halala Company located in Sulaimanyah/Iraq. A number of samples were made according to ISO 6892, and then heat treated with different annealing temperature (850, 900 and 950 ºC). Moreover, the mentioned samples were broken by tensile machine to obtain the required mechanical properties, and to be compared with that of Halala factory. It was shown that higher elongation percentage 34.18%El with lower annealing temperature 900 ºC can be achieved and this leads to decrease the cost of manufacturing without degrading of cylinder’s quality.
KeywordsAnnealing, Ductility, Gas cylinder, SG 255, Soaking time, Tensile test.
 F. William, Foundations of Material Science and Engineering, McGraw-Hill, New york, 2004.
 S. Pitakkorraras, P. Tangroekwarasakul and N. Chokechaithananan, “Effect of Normalizing Temperature and Time on Microstructures and Mechanical Properties of Hot Rolled Steel Strip for Gas Cylinder Production,” Journal of Metals, Materials and Minerals, Vol. 20 (3), PP. 37-41, 2010.
 A. Ramakrishna, N. Siddiqui and P. Lal, “Estimation of LPG Cylinder Parent Metal Yield Strength and Tensile Strength from Hardness Values,” International Journal of Applied Engineering and Technology, Vol. 4 (1), PP. 62-67, 2014.
 D. Fadare, T. Fadara and O. Akanbi, “Effect of Heat Treatment on Mechanical Properties and Microstructure of NST 37-2 Steel,” Journal of Minerals and Materials Characterization and Engineering, Vol. 10 (3), PP: 299-308, 2011.
 P. Offer, C. Daniel and B. Okorie, “The Effects of Intercritical Heat Treatments on the Mechanical Properties of 0.14WT%C - 0.56WT%Mn - 0.13WT%Si Structural Steel,” Nigerian Journal of Technology, Vol. 30 (3), PP: 30-34, 2011.