Every metal have its own physical, chemical and mechanical properties. Brittleness, Creep, Ductility, Elasticity, Fatigue, Hardness, Malleability, Plasticity, Resilience, Stiffness, Toughness, Yield strength are the some mechanical properties of metals. In this post I am specifically going to talk about Hardness. Hardness A material’s ability to withstand friction, essentially abrasion resistance, is known as hardness  cutting tool would break apart if specimen have a more hardness than tool itself. That's why drill bits and cutting tools are made of hard metals, harder than the specimen. More Hardness Doesn't Mean More Strength Glass have a more hardness than steel in general. It is harder to scratch glass than the steel because glass have a higher hardness. Hardness in Steel Steel is an alloy of iron and carbon. Iron have a very low hardness but addition of carbon increases the hardness of iron making it steel. Heat Treatment (hardening, case hardenin...