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Material used for bearing races?

gt-arrowheadgt-arrowhead Posts: 2,507
edited October 2016 in MTB general
Just reading up on what different type of bicycle bearings are made of etc, and i managed to find somewhere that says that bearing races are case hardened, i.e. the steel in the middle retains its toughness, but the outside becomes hard.

But how is it possible to get just the outside of such a thin piece of steel hardened but not the inside. Wouldn't they just harden the whole thing? But then wouldn't hardening the whole race make it quite brittle and not great at surviving shocks/large forces.

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