Question: what is fu in steel?
Answer: Fe250 is known as Mild Steel, Whereas Fe415 and Fe500 are commonly known as High Yield Strength Deformed Bars (HYSD). Yield Strength (fy) = 415 MPa or 500 MPa (depends on the carbon content and other alloys mixed into it. ... Ultimate strength (fu) for HYSD is more or less same as Yield strength (fy).