A client contacted THE LAB at Ambrell because they needed to temper a spring by heating it to 300 °C (570 °F) in 2-4 seconds. The application involved various size stainless steel springs that they needed to heat with one induction coil. THE LAB determined that an Ambrell EASYHEATTM 2 kW, 150-400 kHz induction heating power supply with a multiple-turn C-channel coil would be the right solution for this induction tempering application.