This European Standard specifies the tolerances on dimensions, shape and mass for semi-finished products intended to undergo hot forming by forging, i.e. blooms, slabs and billets made of: - general purpose steels, in accordance with EN 10250-1 to 4; - steels for pressure purposes, in accordance with EN 10222-1 to 5. It does not cover semi-finished products intended for drop forging which are covered by EN 10243-1.