How Steel Was Tempered is a novel set in the industrial period of the Soviet Union. The following are the five main plots: 1. The growth of Pavel Kochagin: The protagonist Pavel Kochagin grew up from a poor peasant to an excellent engineer and entrepreneur during the industrial period of the Soviet Union. He showed his perseverance and courage in the harsh environment. 2. The arduous process of the industrial construction: The novel portrays the difficulties and challenges in the process of the industrial construction of the Soviet Union, including the lack of medical care, environmental pollution, and labor movements. It shows the fighting spirit of the Soviet engineers and workers who are not afraid of hardship and sacrifice. 3. Pioneering spirit and entrepreneur's thinking: In the process of starting a business, the protagonist of the novel, Pavel Kochagin, showed a strong entrepreneur's thinking, including keen insight into the market, in-depth study of technology and accurate prediction of the future. These characteristics were used by many entrepreneurs later. 4. The workers 'movement and class struggle: The novel portrays the scene of the workers' movement and class struggle in the process of the Soviet Union's industrial construction, including the strikes and struggles of the workers for better working conditions and better wages, as well as the conflicts and contradictions of interests between different classes. 5. Personal growth and life choices: In the novel, Pavel Kochagin's growth process also shows his personal growth and life choices, including his loyalty to the industrial construction and his persistence in love, as well as his confusion and turning on the road of life.