The STEELTEMP® software for heating comes in two main editions, edition I for flat and round products, using a finite-difference 2D technique, and edition III for flat products, using a finite-element (FEM) 3D technique. The 3D code is capable of taking into account non-uniform heating of stocks caused by radiation shadowing from the skid pipes, the contact between the wearer bars and the stocks and end effects in the stocks. The 3D temperature calculations have been verified against trials made in slab pusher furnace No. 2 at SSAB Oxelösund's heavy plate mill and slab walking beam furnace No. 302 at SSAB Tunnplåt's hot strip mill.