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| Microstructure and Mechanical Properties of TMCP Processed ABS-EQ47 Plate Steel for Offshore Platform |
| NIU Jian-qing, LIU Dong-sheng, CHEN Huan-de |
| Institute of Research of Iron and Steel, Shasteel, Zhangjiagang 215625, Jiangsu, China |
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Abstract Continuous cooling transformation behavior of commercial ABS-EQ47 grade platform plate steel was investigated under various austenitizing scenarios, i.e., under the non-deformed, deformed, and simulated heat-affected zone (HAZ) conditions. Plates ranged from 35 to 40mm in thickness were rolled from blocks sectioned from the industrially cast EQ47 steel slab during test-scale rolling trials employing thermo-mechanical control processing (TMCP). Single pass welding processes were also simulated on the TMCP treated plates. The microstructures of the plates consist of mainly acicular ferrite (AF) + refined granular bainite (GB). An excellent combination of strength and toughness is achieved showing yield strength (Rp0.2) greater than 500MPa, tensile strength (Rm) greater than 630MPa, and Charpy impact toughness (KV2) greater than 200J even at -60℃. In comparison with a commercial steel plate with the same composition and, however, treated by conventional quenching and tempering (QT) process, the TMCP plates exhibit better yield ratio and higher tensile strength. The KV2 of the simulated coarse-grained HAZ is higher then 40J at -40℃ as long as the heat input of the simulated heat input is less than 30kJ/cm.
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Received: 15 November 2012
Published: 16 September 2013
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2013, Vol. 48 
