Processing of low-carbon cast steels for offshore structural applications

Bolouri, Amir; Kim, Tae Won; Kang, Chung Gil

Abstract

Cast steels with carbon contents of approximately 0.05%, 0.1%, and 0.2% (low-carbon steels) were processed. The investigated steels were first cast. Fully lath martensite was obtained after austenitization and water quenching of the cast steels. The mechanical properties of ∼0.05% carbon steel did not significantly change after tempering at 500°C, 540°C, and 580°C. The strength of ∼0.1% carbon content steel decreased after tempering for 2 h to 3 h at 580°C, and then stabilized at longer tempering times of 6 h. The ductility remained almost constant through the processes. The Charpy impact energy increased when the tempering time was increased from 2 h to 4 h, but decreased remarkably after tempering for 6 h. By increasing the tempering temperature from 450°C to 550°C, the ductility of the ∼0.2% carbon content steel increased, followed by a drop at 600°C. The strength of this steel was the highest at 450°C, but decreased and stabilized at tempering temperatures of 500°C to 600°C. The Charpy impact energy increased monotonically and reached its highest value at 600°C. Finally, the applicability of the investigated cast steels for offshore structures was assessed in detail. © 2013 Taylor and Francis Group, LLC.

• Journal Article Type: Article
• Acceptance Date: Feb 24, 2013
• Publication Date: Nov 2, 2013
• Journal: Materials and Manufacturing Processes
• Print ISSN: 1042-6914
• Electronic ISSN: 1532-2475
• Publisher: Taylor & Francis
• Peer Reviewed: Peer Reviewed
• Volume: 28
• Issue: 11
• Pages: 1260-1267
• DOI: https://doi.org/10.1080/10426914.2013.792424
• Keywords: carbon, low, offshore, steel, structure
• Public URL: https://uwe-repository.worktribe.com/output/937003
• Publisher URL: http://dx.doi.org/10.1080/10426914.2013.792424