Effect of Boron on Penetration of Cu-Sn Liquid Phase into Austenite Grain Boundaries in Carbon Steel

摘要

The suppression of surface hot shortness due to Cu is the most serious in recycling of steel. Copper-enriched phase is formed at steel/scale interface through selective oxidation of Fe during heating for hot rolling. This phase penetrates into austenite grain boundaries during hot deformation and causes surface cracking. Boron (B) is effective in the restraint of the penetration in Sn free steel. In this paper, effects of B in steel and in the liquid phase on the penetration were investigated using steels containing Cu and Sn.