Bone is five times stronger than steel on per weight basis
Compact bone specimens have been found to have tensile strength around 20,000 psi (pounds per square inch).
“Mild” steel such as AISI 1020 Hot Rolled, on the other hand, has a tensile strength of 70,000 psi, and alloy steels that are heat treated can have tensile strengths of over 200,000 psi, ten times stronger than bone.
However, this is not the whole story. Steel is about 4.5 times heavier than bone, so bone is actually stronger than mild steel on a per-weight basis. Engineers are taught ways if using lighter, weaker materials (like wood or bone) and making them behave as if they were stronger than steel. The college course in which you learn this is called “Strength of Materials” or “Mechanics of Materials”.