Using annealed H-13 steel as a hotplate on an induction cooktop is not recommended and could be dangerous. Induction cooktops work by generating an electromagnetic field that interacts with the ferromagnetic material in the cookware, inducing electrical currents and generating heat. For induction cooktops to work efficiently and safely, the cookware must be made of materials with specific magnetic properties, such as stainless steel or cast iron.
H-13 steel is a tool steel commonly used in applications such as forging, but it is not specifically designed for use as cookware. It may not have the necessary magnetic properties to properly interact with the induction cooktop's magnetic field, which means it won't heat up efficiently or evenly. This could lead to uneven cooking and hot spots, making it challenging to control the temperature while cooking.
Moreover, using H-13 steel as a hotplate on an induction cooktop could pose safety risks. Induction cooktops are designed to detect the presence of compatible cookware and shut off automatically when no cookware is detected. If you use non-compatible materials like H-13 steel, the cooktop may not detect it as cookware and could remain on, potentially causing overheating or damage to the cooktop.
In summary, it is not advisable to use annealed H-13 steel as a hotplate on an induction cooktop. Instead, it's best to invest in cookware that is specifically designed for use with induction cooktops, ensuring safe and efficient cooking.