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01.02.2018 | Original Paper | Ausgabe 2/2018

Journal of Iron and Steel Research International 2/2018

Effects of Zr addition on evolution behavior of inclusions in EH36 shipbuilding steel: from casting to welding

Zeitschrift:
Journal of Iron and Steel Research International > Ausgabe 2/2018
Autoren:
Xiao-dong Zou, Jin-cheng Sun, Da-peng Zhao, Hiroyuki Matsuura, Cong Wang

Abstract

The inclusions evolution behavior in the continuous casting slab, rolled plates, and simulated welding samples of EH36 steels with and without Zr addition has been systematically investigated. The inclusions in plain EH36 steel are almost composed of Al–Ca–S–O(–Mn) and undergo negligible changes during the whole process. With Zr addition, a large amount of individually fine MnS precipitates and Zr-containing inclusions are generated. In the rolled EH36-Zr sample, Zr-containing complex inclusions are effective to promote the nucleation of acicular ferrite on the surface, which are hardly found in the simulated welding sample of EH36-Zr steel due to the segregation of soluble Ti and Zr on the grain boundary.

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