20g boiler plate is a kind of steel with high comprehensive mechanical properties, relatively pure steel, and the composition of smelting ingredients and micro-alloying elements are more sensitive to various properties. Therefore, the key to the 20g production process is to optimize the smelting ingredients, reduce the total amount of inclusions in the steel, select suitable micro-alloying elements, adopt controlled rolling, improve the quality of the plate surface, and stabilize the application of aging impact and other technologies. The technical route of 20g is: high-quality molten iron → purification treatment → smelting of component optimization and steel purification → micro-alloying and refining of molten steel → protective casting → high-quality slab → controlled heating → temperature-controlled rolling → plate shape and thickness control → controlled cooling → product.