This hot forming steel cable application is a great fit for induction heat. For cables, there are additional factors to consider when heating with induction. If the cable manufactured very tightly with large strands of wire, the cable may behave similar to a solid cylinder when heated, which is very efficient. However, a loosely assembled cable with small wires, will behave more like many small parts to heat. For smaller parts, higher frequency is more effective in induction heating.
This application also had the added challenge of heating past the curie point for the material. Curie is the temperature at which a material loses its magnetic properties. Since magnetism affects how efficiently a material will heat using induction, this has a big impact on the power requirements for heating.
Check out the complete application note here: http://ultraflexpower.com/application/hot-forming-steel-cable/