Journal of Materials and Engineering Structures
Volume 12, Numéro 4, Pages 469-477
2025-12-30
Effect Of Different Heat Treatments On The Fractural And Microstructural Behavior Of Pipeline Steel
Authors : Sharma Lochan . Jakhar Amman . Mankotia Karan . Singh Narinder . Singla Yogesh Kumar .
Abstract
APIX70 pipeline steel is classified under the American Petroleum Institute (API) specification as one of the high-strength low-alloy (HSLA) steels. The APIX70 has a very fine-grained microstructure so they have high strength and ductility properties. In this research work, an attempt has been made to compare the microstructural and mechanical behaviour of base and heat treated APIX70 pipeline steel. Heat treatment was performed at two different temperatures 900 ̊C and 800 ̊C. Different phases such as ferrite, pearlite as well as blend of both were observed in base and heat treated APIX70 steel. Specimen heat-treated at 900°C shows an increase in hardness to 37.5 HRC as compared to the specimen heat treated at 800 ̊C which is 22.5 HRC. Base metal shows a 33.75 HRC hardness value. Microstructure of X70 base metal exhibit blend of ferritic and pearlitic phases. Heat treatment of X70 at 900 ̊C and 800 ̊C shows there is a significant grain growth takes place while lesser grain growth observed for specimen heat treated at 800 ̊C.
Keywords
API X70 Pipeline steel ; Heat Treatment ; Microstructure ; Scanning Electron Microscope
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