<p>This paper presents the results of thorough evaluations of factorial experiments on the effects of varying boron and titanium contents, plus ‘plain’ thermal analysis (TA) cup type (‘round’ vs. ‘square’ cavity) on the properties of hypoeutectic gray iron. It quantifies the Occam’s razor effects of digital image analysis metallography metrics of gray iron microstructure and ultrasonic velocity to other more quotidian properties. The factorial experiments were comprised of nine distinct sample groups for three distinct levels of both ferroboron and ferrotitanium additions, with both ‘round’ and ‘square’ cavity TA cups poured from a single sample spoon of ~ 25&#xa0;lb. capacity for each of the nine groups. Two sets of the nine sample groups were also cast consecutively for ample replication of each group to attain adequate statistical significance. The response metrics in addition to those of digital image analysis metallography and ultrasonic velocity were iron chemistries, Brinell hardnesses of the ultrasonic coupons, and mechanical properties of miniature test bars machined from the ultrasonic coupons. One original aspect of this research was the host foundry’s use of digital image analysis metallography for quantification of the graphite morphology of gray iron which is geometrically more complex than the graphite morphology of ductile iron.</p>