Effect of Boron on Hardenability of Al-B-N Low Alloy Steels

Abstract

The effect of boron on hardenability was studied in Al-B-N low alloy steels. It was clarified that the effect of boron on hardenability depends upon the amount of soluble boron which is in equilibrium in austenite and that the maximum hardenability can be attained at 3∿5ppm soluble boron. Based on the equilibrium theory, the amounts of Al, B, and N which can bring the maximum hardenability were calculated.

It was concluded that the addition of 0.06 to 0.08% Al gives rise to the maximum hardenability due to boron even with considerable variations of B and N content.