An episode from the life of a metallurgical plant collective. Lu Zhong-kui, an advanced worker appointed as head of the smelting shop, initiates the re-equipment of the open-hearth furnace. The plant director and some specialists warn him that the furnace, built by Americans, is operating at maximum capacity. However, many refer to the experience of the Soviet people and support Lu. And then an accident occurs: steel bursts out of the furnace... This episode is full of drama, as is the entire story about the selfless and persistent struggle of a worker-promoter to fulfill the state plan.