> yield strength, or how much force it takes to break the material That's not yield strength. Yield strength is how much force is required to permanently def

> yield strength, or how much force it takes to break the material That's not yield strength. Yield strength is how much force is required to permanently deform the material. Ultimate tensile strength is the force required to break the material. One great thing about steels is that they tend to work-harden. Typical 250 grade mild steel, meaning it takes in excess of 250 MPa force to permanently stretch a 10mm round diameter section, usually has an ultimate tensile strength exceeding 400 MPa.