Properties and homogeneity of 550-MPa grade TMCP steel for ship hull |
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Authors: | Yi Nie Cheng-jia Shang Xin Song Yang You Chuang Li Xin-lai He |
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Institution: | (1) Central Iron & Steel Research Institute, Beijing, 100081, China |
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Abstract: | Ultra low carbon steels by the thermal mechanical control process (TMCP) with less Ni, Cr, and Mo contents have been developed
for 550 MPa grade heavy gauge ship hulls and offshore structures. The relationships among microstructures, process, and properties
of the studied steel have been investigated. A series of accurate control technologies have been developed for this kind of
steel. Cu microalloying and TMCP+relaxation precipitation control (RPC)+accelerated cooling process were employed to optimize
the mechanical properties and ensure the homogeneity of the 80-mm thick plate. The microstructures of thin plates slightly
changed from surface to center, but the microstructures of the heavy gauge plate (80 mm) changed notably. Adopting the simple
composition, it can meet the requirement of thin plates by adopting a few microalloys. As for thick plates (80 mm), a little
higher Cu and Ni contents should be adopted. These steels can meet the needs without tempering. By these ways, the properties
of the steels can be optimized, and the cost can be decreased notably. |
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Keywords: | |
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