Stiefel Induction Heaters: Energy-Efficient Solutions Since 2013

An induction hardening machine is a specialized type of induction heating system designed exclusively for the surface hardening of ferrous components. The process involves rapidly heating a specific area of a steel or cast iron part to its austenitizing temperature using an induction coil, followed by immediate quenching (typically with a water spray integrated into the coil design). This rapid heating and cooling transformation creates a hard, wear-resistant martensitic layer on the surface, while the core of the part remains soft and ductile. This combination is essential for parts subject to friction and fatigue, such as gear teeth, shafts, cam lobes, and bearing races. The key advantage of induction hardening over furnace hardening is its selectivity; only the functional surfaces that require hardness are treated, minimizing distortion and energy use. Stiefel Combustion's induction hardening machines are precision-engineered with tailored coil geometry and precise quenching controls to achieve exact hardening patterns and case depths consistently. They can be configured as single-spindle machines for large parts or incorporated into rotary indexing tables for high-throughput production. For a hardening solution that enhances component durability and service life, please contact us to arrange an application review.