Effect of Alloying Additives and Microadditives on Hardenability Increase Caused by Action of Boron

The presented work was aimed at evaluating influence of boron on hardenability steel quantitatively and this effect during complex use with other alloying additives like chromium, vanadium titanium. For purpose, eight melts variable chemical compositions were prepared. From the ingots, cylindrical specimens normalized dimensions according to EN ISO 642:1999 cut out subjected full annealing 1200 °C normalizing 900 °C. Such Jominy test. In order distinguish a given melt thus eliminate differences resulting from its composition, grain size austenitizing temperature, obtained ideal critical diameter corrected effectiveness factor determined. performed examinations analyses showed that inadequate quantities microadditives result in losing benefits coming introduction as hardenability-improving element can even reduction boron-containing steel.