Not only does the Young's modulus hardly change between soft and hard steel, it barely changes for any steel. This provides an interesting constraint for some t

Not only does the Young's modulus hardly change between soft and hard steel, it barely changes for any steel. This provides an interesting constraint for some types of engineering. For example, if you are making a bridge you can use better steel to make it stronger, but you can't use better steel to make the bridge have less deflection for a given load. You can only change deflection by engineering the shape and design of the bridge.