Induction heating double-temperature roasting method for high-grade steel elbow

The invention discloses an induction heating double-temperature roasting method for a high-grade steel elbow, and relates to the technical field of high-grade steel elbow heating. According to the method, the local gap of an induction coil is adjusted, a steel pipe welding line is arranged at the position obtained after gap adjustment, and therefore the magnetic flux generated at the gap adjustment position in the induction oil and magnetic flux generated at other positions are different, and the heating temperatures are different accordingly; and the heating temperature based on the normal steel pipe base metal heat roasting is achieved, special control over the heating temperature of the welding line is achieved through the size of the local gap of the induction coil, and therefore double-temperature roasting is achieved, and the performance of the welding line of the elbow is effectively optimized.