Abstract
AbstractIn this chapter, formation of spinel in high strength low alloy steel (HSLA) is discussed, as spinel has been noticed as a typical type of inclusions causing fatigue problems. The commercial steel grade 42CrMo was chosen in the laboratorial slag-steel experiments, in which compositions of the CaO–SiO2–Al2O3–MgO refining slag were changed to elucidate the influences of refining slags on the formation of spinel inclusions. The results indicated important influence of refining slag on the contents of [Mg] and [Al] in liquid steel, which in turn affect the formation of spinel inclusions.
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