The 201 mm thick high value-added hydrogen-resistant steel plate we developed in batches for the first time passed the acceptance inspection, and all performance indicators have reached the industry-leading level. It will replace imports and be used in the manufacturing of pressure vessels for a key project designed by China Petroleum. During the project docking process, technical personnel had in-depth exchanges with CNPC designers. In response to the project's requirements for "hydrogen-resistant steel to be used in Class II wet H2S harsh corrosive environments", the design thickness was 201 mm and the corrosion resistance was better than conventional ones. The high value-added hydrogen-resistant steel plate, which is more than twice as strong as the steel plate, has been recognized by customers.