Total oxygen levels in ball-bearing steels (1.0%C, 0.35%Si, 0.35%Mn, 1.5%Cr) produced in acid open hearth process (< 0.001%Al) and in EAF–ASEA–SKF (0.040%Al). Courtesy to Ovako Steel, Hofors, Sweden. Except for the total oxygen content in the steel, also the type of inclusions is very essential. Inclusions in steel after the acid open
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