The effect of different deoxidation processes on the inclusions characteristics in cold drawn tubing steel

ABSTRACT

The non-metallic inclusions of cold-drawn tubing steel with different deoxidation processes were carried out in this study. The morphologies, compositions and size distribution of oxide inclusions in two heats were obtained by FE-SEM&EDS. The evolution of inclusion types in SM/AC process and SMA/C process were compared. In addition, it was summarized that the removed inclusion of SM/AC process was relatively more at LF station, while the removed inclusion of SMA/C process was mainly at VD station, which is closely related to the calcium treatment intensity at VD station. Moreover, kinetic model calculations of inclusion behaviour were carried out. Taking molten steel-slag-inclusion-refractory four-phase equilibrium into account, and considering the aggregation, floatation, remove and modification of inclusion. The results can well explain the existence of inclusions in the actual production process and can guide the removal of inclusions in different deoxidation processes and to know the removal limits.

KEYWORDS:

• Cold-drawn tube
• inclusions modification
• deoxidation process
• kinetic model

Acknowledgement

The financial support from National Natural Science Foundation of China (51904346), the Introduce Talents Research Fund of Central South University, are greatly acknowledged.

Disclosure statement

The authors declared that they have no conflicts of interest to this work. We declare that we do not have any commercial or associative interest that represents a conflict of interest in connection with the work submitted. On behalf of all authors, the corresponding author states that there is no conflict of interest.

Additional information

Funding

This work was supported by National Natural Science Foundation of China (Grant number 51904346).