① The selected raw material steel is smelted in an intermediate frequency electric furnace so that the temperature of the molten steel reaches 1600-1700 ° C;
② Preheat the metal mold to 800-900 ℃ to keep constant temperature;
③ Start the centrifuge and inject the molten steel from step ① into the metal mold after preheating in step ②;
④ The casting is naturally cooled to 800-900 ° C and held for 1-10 minutes;
⑤ Cool with water to near normal temperature, and remove the casting from the mold.