Grade 25 Chrome steel bearing balls are widely used in precision ball bearings as well as most aerospace, transportation and industrial applications. Chromium (Cr) has a tendency to increase hardness, toughness and wear resistance of steel. Chrome steel is a chrome alloy carbon steel, not a chrome plated steel.
Chrome steel balls have excellent surface quality, high hardness and high load bearing capacity as a result of through hardening (Rockwell C 60-67). Chrome steel isaproximetly 96% iron and capable of being attracted by a magnet.
Less expensive case-hardened carbon steel steel balls are used in consumer goods like drawer slides and casters.
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