Effect of controlled rolling and controlled cooling process on microstructure and properties of 440 MPa grade hull steel

doi:10.13251/j.issn.0254-6051.2021.04.024

Abstract

Abstract: Through measuring the continuous cooling transformation (CCT) curves and controlled rolling and controlled cooling test, the phase transformation characteristics, microstructure and properties of 440 MPa grade hull steel were studied. The results show that the bainite microstructure can be obtained under a wide range of cooling rate. With the decrease of final rolling temperature, the strength and toughness of the steel are improved. Under the condition of air cooling after rolling, the ferrite and pearlite microstructure are obtained with good toughness, while the reserve for strength is relatively low. With the accelerated cooling after rolling, the strength is obviously increased. At the simulated coiling temperature of 550 ℃, the match of strength and toughness is comparatively better. In conclusion, the preferred process parametons of controlled rolling and controlled cooling are finial rolling at 840 ℃, accelerated cooling with (20±5) ℃/s after rolling and coiling at 550-560 ℃.

Key words: 440 MPa grade hull steel, CCT curve, controlled rolling and controlled cooling, microstructure and properties

CLC Number:

TG142. 1

Wang Sicheng, Zhou Dan, Chai Xiyang, Tong Shi, Yang Yang, Wang Tianqi. Effect of controlled rolling and controlled cooling process on microstructure and properties of 440 MPa grade hull steel[J]. Heat Treatment of Metals, 2021, 46(4): 138-142.

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